Foreign object detection for wireless charging systems

Abstract

A wireless charging system and method for detecting a foreign object in proximity to the wireless charging system. The wireless charging system (10) includes a wirelessly rechargeable battery (14) that receives power from a wireless charging device (16) when the wirelessly rechargeable battery (14) is in proximity to the wireless charging device (16). The wireless charging device (16) determines actual electrical consumption of the wireless charging system (10), and the wirelessly rechargeable battery (14) measures a voltage induced in the wirelessly rechargeable battery (14) by the wireless charging device (16). The wireless charging device (16), the wirelessly rechargeable battery (14), or a combination of the two, determines predicted electrical consumption of the wireless charging system (10) based on the measured voltage, and determines whether a foreign object (12) is in proximity to the wireless charging system (10) based on the predicted electrical consumption and the actual electrical consumption.

Description

[Technical field]

[0001] Related Applications This application claims priority to U.S. Provisional Patent Application No. 62 / 884,092, filed Aug. 7, 2019, which is hereby incorporated by reference in its entirety. [Background technology]

[0002] When a conductive foreign object is placed in close proximity to the transmitting coil of a wireless charging system, the transmitting coil induces a current in the foreign object, causing the foreign object to increase in temperature, which can damage materials used in and around the wireless charging system as well as accidentally burn the user. Summary of the Invention

[0003] In one example, a system for detecting a foreign object in proximity to a wireless charging device includes a wirelessly rechargeable battery. The wirelessly rechargeable battery includes a receiving coil that receives power from the wireless charging device when in proximity to the wireless charging device, one or more battery cells, and an electrical load. The system also includes at least one controller configured to switch the wirelessly rechargeable battery between a first configuration in which the receiving coil is connected to the one or more battery cells and decoupled from the electrical load to charge the one or more battery cells, and a second configuration in which the receiving coil is connected to the electrical load and decoupled from the one or more battery cells to power the electrical load. The at least one controller is also configured to measure an induced voltage in the wirelessly rechargeable battery by the wireless charging device, and determine a predicted electrical loss of the wirelessly rechargeable battery as a first electrical characteristic based on the measured voltage, and determine a second electrical characteristic of the electrical load when the wirelessly rechargeable battery is in the second configuration. The at least one controller is further configured to determine whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics.

[0004] In another example, a wireless charging device includes a transmitting coil for transmitting power to the wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the transmitting coil, a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil, and at least one controller, the at least one controller configured to determine a first electrical characteristic of the power supply signal, determine a predicted electrical loss of the wireless charging device as a second electrical characteristic, and determine whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics.

[0005] In a further example, a method is provided for detecting a foreign object in proximity to a wireless charging system including a wireless charging device and a wirelessly rechargeable battery, the wirelessly rechargeable battery having a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device, one or more battery cells, and an electrical load. The method includes switching the wirelessly rechargeable battery to a first configuration in which the receiving coil is connected to the electrical load and disconnected from the one or more battery cells to provide power to the electrical load, measuring an induced voltage in the wirelessly rechargeable battery by the wireless charging device, and determining a predicted electrical loss of the wirelessly rechargeable battery based on the measured voltage as a first electrical characteristic. The method also includes determining a second electrical characteristic of the electrical load when the wirelessly rechargeable battery is in the first configuration, and determining whether the foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics.

[0006] In a further example, a method of detecting a foreign object in proximity to a connected wireless charging device is provided, the wireless charging device having a transmitting coil for transmitting power to a wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the transmitting coil, and a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil, the method including determining a first electrical characteristic of the power supply signal, determining a predicted electrical loss of the wireless charging device as a second electrical characteristic, and determining whether the foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics.

[0007] In a further example, a wireless charging system for detecting a foreign object includes a wireless charging device and a wirelessly rechargeable battery that receives power from the wireless charging device when the wirelessly rechargeable battery is in proximity to the wireless charging device. The wireless charging device includes a first controller configured to determine an actual electrical consumption of the wireless charging system. The wirelessly rechargeable battery includes a second controller configured to measure an induced voltage in the wirelessly rechargeable battery by the wireless charging device. The first controller, the second controller, or a combination of the first and second controllers are configured to determine a predicted electrical consumption of the wireless charging system based on the measured voltage, and determine whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption.

[0008] In a further example, a wirelessly rechargeable battery for detecting a foreign object in proximity to a wireless charging system is provided. The wireless charging system includes a wirelessly rechargeable battery and a wireless charging device that transmits power to the wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the wireless charging device. The wirelessly rechargeable battery includes a controller configured to measure a voltage induced in the wirelessly rechargeable battery by the wireless charging device, determine a predicted electrical consumption of the wireless charging system based on the measured voltage, and determine whether the foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption of the wireless charging system.

[0009] In a further example, a method is provided for detecting a foreign object in proximity to a wireless charging system including a wireless charging device and a wireless rechargeable battery that receives power from the wireless charging device when the wireless rechargeable battery is in proximity to the wireless charging device. The method includes determining, by the wireless charging device, an actual electrical consumption of the wireless charging system, and measuring, by the wireless rechargeable battery, an induced voltage in the wireless rechargeable battery by the wireless charging device. The method further includes determining, by the wireless charging device, the wireless rechargeable battery, or a combination of the wireless charging device and the wireless rechargeable battery, a predicted electrical consumption of the wireless charging system based on the measured voltage, and determining, by the wireless charging device, the wireless rechargeable battery, or a combination of the wireless charging device and the wireless rechargeable battery, whether the foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption.

[0010] In a further example, a method is provided for detecting a foreign object in proximity to a wireless charging system including a wirelessly rechargeable battery and a wireless charging device that transmits power to the wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the wireless charging device, the method includes measuring, by the wirelessly rechargeable battery, a voltage induced in the wirelessly rechargeable battery by the wireless charging device, determining, by the wirelessly rechargeable battery, a predicted electrical consumption of the wireless charging system based on the measured voltage, and determining, by the wirelessly rechargeable battery, whether the foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption of the wireless charging system.

[0011] In another example, a wireless charging system for detecting a foreign object includes a wirelessly rechargeable battery and a wireless charging device having a transmitting coil for charging the wirelessly rechargeable battery when the wirelessly rechargeable battery is placed in proximity to the transmitting coil. The wireless charging system further includes at least one controller configured to determine a first predicted electrical consumption of the wireless charging system corresponding to the first distance in response to the wirelessly rechargeable battery being placed at a first distance from the transmitting coil of the wireless charging device, and to determine whether the foreign object is in proximity to the wireless charging device based on the first predicted electrical consumption. The at least one controller is further configured to determine a second predicted electrical consumption of the wireless charging system corresponding to the second distance in response to the wirelessly rechargeable battery being placed at a second distance different from the first distance from the transmitting coil of the wireless charging device, and to determine whether the foreign object is in proximity to the wireless charging device based on the second predicted electrical consumption.

[0012] In another example, a method is provided for detecting a foreign object in proximity to a wireless charging system including a wirelessly rechargeable battery and a wireless charging device having a transmitting coil for charging the wirelessly rechargeable battery when the wirelessly rechargeable battery is placed in proximity to the transmitting coil. The method includes, in response to the wirelessly rechargeable battery being placed at a first distance from the transmitting coil of the wireless charging device, determining a first predicted electrical consumption of the wireless charging system corresponding to the first distance, and determining whether the foreign object is in proximity to the wireless charging system based on the first predicted electrical consumption. The method further includes, in response to the wirelessly rechargeable battery being placed at a second distance different from the first distance from the transmitting coil of the wireless charging device, determining a second predicted electrical consumption of the wireless charging system corresponding to the second distance, and determining whether the foreign object is in proximity to the wireless charging system based on the second predicted electrical consumption.

[0013] In another example, a method for calibrating a wirelessly rechargeable battery to detect a foreign object in proximity to a wireless charging system is provided, the wireless charging system includes a wirelessly rechargeable battery and a wireless charging device having a transmitting coil, the wirelessly rechargeable battery has a receiving coil, an electrical load connected to the receiving coil, and a non-volatile storage device. The method includes: placing the wirelessly rechargeable battery in proximity to the wireless charging device such that the receiving coil is located at a first distance from the transmitting coil; measuring a first induced voltage in the wirelessly rechargeable battery by the wireless charging device while the wirelessly rechargeable battery is placed in proximity to the wireless charging device such that the receiving coil is located at the first distance from the transmitting coil; measuring a first electrical characteristic of a signal supplied to the electrical load and a first electrical characteristic of a power supply signal provided by the wireless charging device; and determining a first electrical loss of the wirelessly rechargeable battery based on the first electrical characteristic of the electrical load, the first electrical characteristic of the power supply signal provided by the wireless charging device, and a predicted electrical loss of the wireless charging device. The method further includes: placing the wirelessly rechargeable battery in proximity to the wireless charging device such that the receiving coil is located at a second distance from the transmitting coil different from the first distance; measuring a second induced voltage in the wirelessly rechargeable battery by the wireless charging device while the wirelessly rechargeable battery is located in proximity to the wireless charging device such that the receiving coil is located at the second distance from the transmitting coil; measuring a second electrical characteristic of a signal provided to the electrical load and a second electrical characteristic of a power supply signal provided by the wireless charging device; and determining a second electrical loss of the wirelessly rechargeable battery based on the second electrical characteristic of the electrical load, the second electrical characteristic of the power supply signal provided by the wireless charging device, and the predicted electrical loss of the wireless charging device. The method also includes generating calibration data for the wirelessly rechargeable battery based on the first electrical loss of the wirelessly rechargeable battery, the second electrical loss of the wirelessly rechargeable battery, the first measured voltage, and the second measured voltage, and storing the calibration data in a non-volatile storage device of the wirelessly rechargeable battery.

[0014] In a further example, a wireless charging system for detecting a foreign object includes a wireless charging device, a wirelessly rechargeable battery having one or more battery cells configured to be charged from received power from the wireless charging device when the wirelessly rechargeable battery is in proximity to the wireless charging device for charging the one or more battery cells, and at least one controller, the at least one controller configured to initiate a charging cycle in response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device, monitor an electrical characteristic of a power delivery signal provided by the wireless charging device during the charging cycle, and trigger a foreign object detection cycle based on the monitored electrical characteristic.

[0015] In another example, a method is provided for detecting a foreign object in proximity to a wireless charging system including a wirelessly rechargeable battery having one or more battery cells and a wireless charging device for charging the one or more battery cells of the wirelessly rechargeable battery. The method includes placing the wirelessly rechargeable battery in proximity to the wireless charging device, initiating a charging cycle, monitoring an electrical characteristic of a power delivery signal provided by the wireless charging device during the charging cycle, and triggering a foreign object detection cycle based on the monitored electrical characteristic.

[0016] Advantages of the present disclosure will be readily appreciated when considered in conjunction with the accompanying drawings and better understood by reference to the following detailed description: Non-limiting, non-exhaustive embodiments of the present disclosure are described with reference to the following figures, in which like numerals refer to like parts throughout the various views unless otherwise specified, and in which: [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 illustrates a wireless charging system for detecting a foreign object in proximity to the wireless charging system. [Diagram 2] FIG. 2 illustrates components of a wireless charging system. [Figure 3A]1A and 1B are diagrams illustrating changes in the position of a wirelessly rechargeable battery relative to a wireless charging device of a wireless charging system. [Figure 3B] 1A and 1B are diagrams illustrating changes in the position of a wirelessly rechargeable battery relative to a wireless charging device of a wireless charging system. [Figure 4] FIG. 13 illustrates power consumption of a wireless charging system as a function of distance between a wirelessly rechargeable battery of the wireless charging system and a wireless charging device. [Diagram 5] 1A-1C illustrate a method for detecting a foreign object in proximity to a wireless charging system. [Figure 6] FIG. 13 illustrates example calibration data for determining projected power consumption of a wirelessly rechargeable battery in a wireless charging system. [Figure 7] FIG. 2 illustrates the power characteristics for charging a wirelessly rechargeable battery of the wireless charging system. [Figure 8] FIG. 1 illustrates a charging device for charging multiple wirelessly rechargeable batteries. [Figure 9] FIG. 1 illustrates a sterilizable container for housing a wirelessly rechargeable battery. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Throughout this specification, references to "one instance," "an instance," "one example," "an example" mean that a particular feature, structure, or characteristic described in connection with the example or example is included in at least one instance of the invention. In various places throughout this specification, the appearances of the phrases "in one instance," "in an instance," "in one example," "in an example" do not all refer to the same instance or example. Furthermore, particular features, structures, or characteristics may be combined in any suitable combinations and / or subcombinations in one or more instances or examples. In addition, it will be understood that the figures provided herein are for illustrative purposes to persons skilled in the art, and that the drawings are not necessarily drawn to scale.

[0019] FIG. 1 illustrates a wireless charging system 10 configured to detect a foreign object 12 in proximity to the wireless charging system 10. When a foreign object 12, or more specifically, a conductive foreign object 12, is accidentally placed in proximity to the wireless charging system 10, the wireless charging system 10 may induce a current in the foreign object 12, which increases the temperature of the foreign object 12. The heated foreign object 12 may damage materials used in and around the wireless charging system 10, such as by melting adjacent resin materials, or may burn a user who comes into contact with the wireless charging system 10 and the foreign object 12. Thus, the wireless charging system 10 is configured to detect whether a foreign object 12 is in proximity to the wireless charging system 10, and in response to detection of such a foreign object 12, disable charging operations and alert the user.

[0020] The wireless charging system 10 includes a wirelessly rechargeable battery 14 and a wireless charging device 16. The wireless charging device 16 includes a charging surface 18. The wireless charging device 16 is configured to charge the wirelessly rechargeable battery 14 when the wirelessly rechargeable battery 14 is placed in proximity to the charging surface 18. In particular, the wireless charging device 16 induces an electrical signal into the wirelessly rechargeable battery 14 that charges the wirelessly rechargeable battery 14.

[0021] 1 also illustrates a foreign object 12 placed in proximity to the charging surface 18. The foreign object 12 may include a conductive material in which the wireless charging system 10 induces a current, as described above. In the illustrated example, the foreign object 12 is a paper clip. As other non-limiting examples, the foreign object 12 may be a coin, a key, or a ring. The foreign object 12 may also be a medical object, such as a sterilization indicator with a metal foil backing.

[0022] FIG. 2 illustrates components of the wireless charging system 10, and more specifically, the components of the wireless rechargeable battery 14 and the wireless charging device 16. The wireless charging device 16 includes a power source 20, a charger control circuit 22, and a transmitting coil 24. The charger control circuit 22 includes a DC / AC converter 26. During operation of the wireless charging system 10, the power source 20 receives a utility power signal from a utility power source 28, such as a wall outlet. The utility power signal is alternating current (AC). The power source 20 is configured to output a power supply signal from the received utility power signal. In particular, the power source 20 is an AC / DC converter, and the power supply signal is a supply voltage v supply , supply current i supply , and the supply power P supplyThe power supply signal may be a direct current (DC) signal having a voltage of 0.1 V. The power source 20 is configured to provide the power supply signal to a DC / AC converter 26 of the charger control circuit 22. The DC / AC converter 26 may be configured to generate an AC signal from the power supply signal across the transmitting coil 24. The AC signal across the transmitting coil 24 generates an electromagnetic field that induces a corresponding AC signal in a receiving coil 30 of the wirelessly rechargeable battery 14 when the wirelessly rechargeable battery 14 is placed in proximity to the charging surface 18.

[0023] In addition to the receive coil 30, the wirelessly rechargeable battery 14 may include a voltage rectifier 32, a voltage regulator 34, a battery control circuit 36, and one or more battery cells 38. When the receive coil 30 of the wirelessly rechargeable battery 14 is placed in proximity to the charging surface 18, an electrical signal of the receive coil 30 induced by the transmit coil 24 is provided to the voltage rectifier 32. The voltage rectifier 32 is configured to generate input power from the induced signal of the receive coil 30. The input power signal is a receive voltage v rec The voltage rectifier 32 is configured to provide the input power signal to a voltage regulator 34, which is in turn configured to output a load signal from the received power signal. The load signal is a load voltage v load , load current i load , and the load power P load When the wireless charging system 10 is operating in the charging mode, the battery control circuit 36 ​​is configured to send a load signal to the battery cell 38 to charge the battery cell 38.

[0024] Upon the occurrence of a predetermined event, the wireless charging system 10 is configured to transition from a charging mode to a foreign object detection mode to determine whether a foreign object 12 is in proximity to a charging surface 18 of the wireless charging device 16. The wireless charging system 10 may make this determination by determining a predicted electrical consumption of the wireless charging system 10 assuming that the foreign object 12 is not present, and comparing the predicted electrical consumption to the actual electrical consumption of the wireless charging system 10 to determine whether the foreign object 12 is drawing power from the wireless charging system 10.

[0025] The electrical consumption of the wireless charging system 10 may be a function of electrical losses of the wireless charging system 10 and electrical consumption by a load of the wireless charging system 10, such as the battery cells 38. The electrical losses of the wireless charging system 10 correspond to the power losses of the wireless charging system 10, including the power dissipated by the foreign object 12, when the foreign object 12 is present, and the electrical consumption by the load of the wireless charging system 10 corresponds to the power dissipated by the load of the wireless charging system 10. Thus, the electrical consumption of the wireless charging system 10 corresponds to the power supplied by the wireless charging system 10, more specifically, the power supplied by the power source 20 and consumed by the wireless charging system 10, and the power consumed by the foreign object 12 when the foreign object 12 is in proximity to the wireless charging system 10.

[0026] Power consumption by the wireless charging system 10 comes from a variety of sources. For example, power may be dissipated by the inherent structures of the wireless charging device 16, such as the charger control circuitry 22 and the transmit coil 24. Power may also be dissipated by the inherent structures of the wirelessly rechargeable battery 14, such as the voltage rectifier 32, the voltage regulator 34, and the battery control circuitry 36. Power may further be dissipated by the loads of the wirelessly rechargeable battery 14, such as the battery cells 38. The power dissipated by the inherent structures of the wireless charging device 16 is referred to herein as the power loss P of the wireless charging device 16. Tx losses , and the power dissipated by the inherent structure of the wirelessly rechargeable battery 14 is referred to herein as the power loss P Rx lossesThe power consumed by the load of the wirelessly rechargeable battery 14 is referred to herein as P load It is called.

[0027] The power consumed by the wireless charging system 10 is P Tx losses , P Rx losses , and P load Assuming that the foreign object 12 is not placed in close proximity to the transmit coil 24 of the wireless charging device 16, this sum is, as used herein, substantially equal to the sum of P supply In other words, when no foreign object 12 is present, the following relationship is true:

[0028] 0≒P supply -P Tx losses -P Rx losses -P load

[0029] However, when the foreign object 12 is placed in close proximity to the transmission coil 24 of the wireless charging device 16, the power supplied by the power source 20, P supply Some of the power dissipated by the foreign object 12 is also consumed by the foreign object 12. In particular, when the foreign object 12, which includes a conductive material, enters the magnetic field generated by the transmit coil 24, the magnetic field induces eddy currents in the conductive material. These currents cause the foreign object 12 to dissipate power from the wireless charging system 10. The power dissipated by the foreign object 12 is referred to herein as P FO Therefore, when a foreign object 12 is present, the following relationship is true:

[0030] P FO ≒P supply -P Tx losses -P Rx losses -P load

[0031] Therefore, to determine whether the foreign object 12 is present, the wireless charging system 10 may calculate the actual power consumption of the wireless charging system 10, referred to as the actual power consumption of the wireless charging system 10, by calculating the power supplied by the power source 20, P supplyand the predicted power consumption of the wireless charging system 10 assuming the foreign object 12 is not present. If the difference is below a predetermined threshold, the wireless charging system 10 is configured to determine that the foreign object 12 is not present. If the difference is equal to or greater than the predetermined threshold, the foreign object 12 is not expected to consume power P FO , and the wireless charging system 10 is configured to determine that the foreign object 12 is present.

[0032] The power consumed by the wireless charging system 10, or more specifically, by the wireless rechargeable battery 14, may also be a function of the position of the receiving coil 30 of the wireless rechargeable battery 14 relative to the transmitting coil 24 of the wireless charging device 16. In particular, the receiving coil 30 may be spaced a variety of distances from the transmitting coil 24, but still receive power from the transmitting coil 24. For example, referring to FIG. 3A, the wireless rechargeable battery 14 is disposed on the charging surface 18 of the wireless charging device 16 such that the receiving coil 30 is spaced a distance D1 from the transmitting coil 24, where the distance D1 corresponds to the thickness of the housing of the wireless rechargeable battery 14. As another example, referring to FIG. 3B, the wireless rechargeable battery 14 is disposed in a sterilizable container 39 and disposed on the charging surface 18 of the wireless charging device 16 such that the receiving coil 30 is spaced a distance D2 from the transmitting coil 24, where the distance D2 includes both the thickness of the housing of the wireless rechargeable battery 14 and the thickness of the sterilizable container 39, and is greater than the distance D1. As a further example, the wirelessly rechargeable battery 14 is placed on the charging surface 18 of the wireless charging device 16 with the receive coil 30 off-center from the transmit coil 24 .

[0033] The power consumed by the wirelessly rechargeable battery 14, and similarly the power consumed by the wireless charging system 10, may vary as a function of the distance between the receive coil 30 of the wirelessly rechargeable battery 14 and the transmit coil 24 of the wireless charging device 16. For example, FIG. 4 illustrates a solid line graph showing the power consumed by the wireless charging system 10 when the foreign object 12 is not in close proximity to the wireless charging device 16, as a function of the received voltage v induced by the wireless charging device 16 into the wirelessly rechargeable battery 14. recAs shown, the greater the distance between the receiving coil 30 and the transmitting coil 24, the greater the received voltage v induced in the wirelessly rechargeable battery 14 by the wireless charging device 16. rec becomes smaller and the power consumed by the wireless charging system 10 becomes correspondingly larger.

[0034] FIG. 4 also illustrates a dotted line representing the power consumed by the wireless charging system 10 when the foreign object 12 is in close proximity to the wireless charging device 16, as well as a dotted line representing the received voltage v induced by the wireless charging device 16 to the wirelessly rechargeable battery 14. rec 3A and 3B, the power consumed by the wireless charging system 10 when the foreign object 12 is in close proximity to the wireless charging device 16 may be similar to the power consumed by the wireless charging system 10 when the foreign object 12 is not present but the distance between the receive coil 30 and the transmit coil 24 is increased. This situation may be represented by the example shown in FIGS.

[0035] The wireless charging system 10 is configured to distinguish between a case where the wirelessly rechargeable battery 14 is located at a distance from the wireless charging device 16 without the foreign object 12 and a case where the wirelessly rechargeable battery 14 is located at a greater distance from the wireless charging device 16 and the foreign object 12 is in close proximity to the wireless charging device 16, even if the power consumption of the wireless charging system 10 is similar in both cases. More specifically, the wireless charging system 10 is configured to determine a projected power consumption of the wireless charging system 10 based on electrical characteristics of the wireless charging system 10 measured at run-time and predetermined calibration data specific to the wireless charging system 10. The projected power consumption of the wireless charging system 10 assumes that the foreign object 12 is not in close proximity to the wireless charging device 16. The wireless charging system 10 is also configured to determine an actual power consumption of the wireless charging system 10 based on electrical characteristics of the wireless charging system 10 measured at run-time. For example, the actual power consumption may be determined based on the power P provided by the power source 20. supply The predicted power consumption of the wireless charging system 10 corresponds to the arbitrary power P FOdoes not include the power P FO When the supply current i supply increases, so the power P FO is dissipated by the foreign object 12, the actual power consumption determined for the wireless charging system 10 will increase. Thus, unlike the predicted power consumption, the actual power consumption is the power P FO Thus, the wireless charging system 10 is configured to determine that the foreign object 12 is in proximity to the wireless charging device 16 if the actual power consumption differs from the predicted power consumption by more than a predefined threshold.

[0036] Instead of the power consumption, the electrical consumption determined by the wireless charging system 10 to determine whether the foreign object 12 is in proximity to the wireless charging device 16 may be defined by the current through the wireless charging system 10. In particular, since the power dissipated by an object is a function of the voltage across the object and the current through the object, and the voltage across the wireless charging system 10 remains substantially constant during a given foreign object detection cycle, the wireless charging system 10 may be configured to determine a predicted current through the wireless charging system 10, assuming the foreign object 12 is not present, and compare the predicted current with an actual current supplied to the wireless charging system 10 to determine whether the foreign object 12 is in proximity to the wireless charging device 16. The actual current supplied to the wireless charging system 10 may be defined as the supplied current i supply If the actual current differs from the expected current by more than a predetermined threshold, then the wireless charging system 10 is configured to determine that the foreign object 12 is in proximity to the wireless charging device 16. Thus, in the following examples, reference is made to the power supplied and consumed by the wireless charging system 10 to detect the presence of the foreign object 12, although it will be understood that the current supplied and consumed by the wireless charging system 10 may alternatively be used.

[0037] The wirelessly rechargeable battery 14 and the wireless charging device 16 may each include a sensor 40 and a controller 42 to determine whether the foreign object 12 is in proximity to the wireless charging device 16. The sensor 40A of the wirelessly rechargeable battery 14 is configured to generate data indicative of an electrical characteristic of an electrical signal in the wireless charging device 16, and the sensor 40B of the wireless charging device 16 is configured to generate data indicative of an electrical characteristic of an electrical signal in the wireless charging device 16. As a non-limiting example, the sensor 40 of each of the wirelessly rechargeable battery 14 and the wireless charging device 16 includes a voltage sensor and a current sensor.

[0038] The controller 42 is configured to determine whether the foreign object 12 is in proximity to the wireless charging device 16 based on the electrical characteristics indicated by the sensor data generated by the sensor 40. In particular, the controller 42 is configured to determine a predicted electrical consumption of the wireless charging system 10 based on the sensor data, and to determine whether the foreign object 12 is in proximity to the wireless charging device 16 based on the predicted electrical consumption and the actual electrical consumption of the wireless charging system 10, as described herein.

[0039] The electrical consumption of the wireless charging system 10 may be a function of the current through the wireless charging system 10, including the current through the battery cells 38. Because the impedance of the battery cells 38 varies with their charge level, determining the expected electrical consumption of the wireless charging system 10 as a function of the current through the battery cells 38 when the battery cells 38 are being charged may complicate the determination and produce inaccurate results. Thus, the wireless rechargeable battery 14 also includes an electrical load 46 for performing foreign object detection. The electrical load 46 may have a predetermined fixed impedance. In some examples, the electrical load 46 represents the impedance of the battery cells 38 when the battery cells 38 are fully charged or substantially fully charged. In other words, the electrical load 46 has an impedance sized to dissipate an amount of power substantially equal to the maximum amount of power that may be provided to the battery cells 38 during charging of the battery cells 38, which occurs when the battery cells 38 are nearly fully charged. For example, the electrical load 46 may include one or more resistors sized to provide a combined resistance of 8.3 ohms and dissipate 15 watts of power.

[0040] The wireless rechargeable battery 14 includes one or more switches 48, such as a switch 48A between the connection voltage regulator 34 and the battery cell 38, and a switch 48B between the voltage regulator 34 and the electrical load 46, to switch between a charging configuration in which the receiving coil 30 is connected to the battery cell 38 to charge the battery cell 38, and a foreign object detection configuration in which the receiving coil 30 is connected to the electrical load 46 to provide power to the electrical load 46. The battery controller 42A is configured to switch the wireless rechargeable battery 42A between these configurations. In particular, when a charging cycle is triggered, the battery controller 42A is configured to engage the switch 48A and release the engaged switch 48B, such that the receiving coil 30 is connected to the battery cell 38 and disconnected from the electrical load 46. As a result, power from the receiving coil 30 is provided to charge the battery cell 38. When a foreign object detection cycle is triggered, the battery controller 42A is configured to release the engaged switch 48A and engage the switch 48B, such that the receiving coil 30 is connected to the electrical load 46 and disconnected from the battery cell 38. As a result, power from the receiving coil 30 is provided to the electrical load 46. When neither a charging cycle nor a foreign object detection cycle is being performed by the wireless charging system 10, such as when the wirelessly rechargeable battery 14 is not in proximity to the wireless charging device 16 or a foreign object 12 is detected, the battery controller 42A is configured to release both switches 48A, 48B, such that neither the battery cell 38 nor the electrical load 46 receives power from the receiving coil 30. Thereafter, in response to a charging cycle or a foreign object detection cycle being triggered, the battery controller 42A is configured to engage the switch 48A or the switch 48B, respectively.

[0041] Instead of the electrical load 46 having the impedance of the battery cell 38 when the battery cell 38 is fully charged or substantially fully charged, the electrical load 46 may be configured to have an impedance to minimize the amount of power transmitted by the transmit coil 24 to the receive coil 30 during each foreign object detection cycle. In other words, the electrical load 46 may be configured to have a relatively large impedance, for example, about 56 ohms, that consumes about 2 watts of power during a given foreign object detection cycle. The smaller amount of power consumption allows the wireless charging system 10 to detect smaller changes from expected electrical consumption, contributing to increased detection of the foreign object 12.

[0042] Each controller 42 of the wireless charging system 10 may include a processor 50, a memory 52, and a non-volatile storage device 54. The processor 50 may include one or more devices selected from microprocessors, microcontrollers, digital signal processors, microcomputers, central processing units, field programmable gate arrays, programmable logic devices, state machines, logic circuits, analog circuits, digital circuits, and / or any other devices that manipulate signals (analog or digital) based on operational instructions stored in the non-volatile storage device 54 and read into the memory 52. ​​The memory 52 may include a single memory device or multiple memory devices, including, but not limited to, read only memory (ROM), random access memory (RAM), volatile memory, non-volatile memory, static random access memory (SRAM), dynamic random access memory (DRAM), flash memory, cache memory, and / or any other device capable of storing information. The non-volatile storage device 54 may include one or more persistent data storage devices, such as hard drives, optical drives, tape drives, non-volatile solid state devices, and / or any other device capable of persistently storing information.

[0043] The processor 50 of each controller 42 is programmed to perform the functions, features, operations, methods, and modules of the controller 42 as described herein. In particular, the processor 50 operates under the control of software embodied by computer-executable instructions residing in the non-volatile storage device 54. The computer-executable instructions may be compiled or interpreted in a variety of programming languages ​​and / or technologies, including, but not limited to, Java, C, C++, C#, Objective C, Fortran, Pascal, Java Script, Python, Perl, and PL / SQL, either alone or in combination. In operation, the processor 50 is configured to read the computer-executable instructions into the memory 52 and then execute the computer-executable instructions. The computer-executable instructions, when executed by the processor 50, are configured to cause the processor 50 to perform the functions, features, operations, methods, and modules of the controller 42 as described herein.

[0044] For example, the computer-executable instructions in the non-volatile storage 54 of the controller 42, when executed by the processor 50 of the controller 42, are configured to cause the processor 50 to determine whether the foreign object 12 is in proximity to the wireless charging device 16 based on electrical characteristics measured by the controller 42, such as using the sensor 40. In particular, the computer-executable instructions of the battery controller 42A, when executed, are configured to cause the processor 50A to determine electrical characteristics corresponding to electrical signals in the wirelessly rechargeable battery 14. The electrical characteristics determined by the battery controller 42A may be indicative of a predicted electrical consumption of the wirelessly rechargeable battery 14. Similarly, the computer-executable instructions of the charger controller 42B, when executed, are configured to cause the processor 50B to determine electrical characteristics corresponding to electrical signals in the wireless charging device 16. The electrical characteristics determined by the charger controller 42B are indicative of a predicted electrical consumption of the wireless charging device 16, which may be indicative of the power provided by the wireless charging system 10.

[0045] The computer-executable instructions of the controllers 42, when executed, may be configured to cause the processor 50 to aggregate data generated based on the electrical characteristics determined in one of the controllers 42. Accordingly, the computer-executable instructions of one controller 42, when executed, are configured to cause the processor 50 of that controller 42 to determine whether the foreign object 12 is in proximity to the wireless charging device 16 based on the aggregated data, as described herein.

[0046] To facilitate data communication between the controllers 42, each of the wireless rechargeable battery 14 and the wireless charging device 16 includes a communication device 44. In some examples, the communication device 44 is a wireless communication device configured to support wireless communication between the battery controller 42A and the charger controller 42B when the wireless rechargeable battery 14 is placed in proximity to the wireless charging device 16. For example, without limitation, the communication devices 44 may each be configured to transmit and receive data wirelessly using infrared, NFC, RFID, ZigBee, Bluetooth, and / or Wi-Fi protocols.

[0047] In addition to software programs embodied by computer-executable instructions, the non-volatile storage 54 of each controller 42 may also store data supporting the functions, mechanisms, processes, methods, and modules of the controller 42 illustrated herein. For example, the non-volatile storage 54 of each controller 42 stores calibration data that enables the controller 42 to determine projected electrical consumption. Each controller 42 may be configured to query the calibration data stored within the non-volatile storage 54 of the controller 42 to assist in determining the presence of a foreign object 12.

[0048] As a non-limiting example, the non-volatile storage device 54A may store the voltage v induced in the wirelessly rechargeable battery 14 and measured by the battery controller 42A using the sensor 40A. recThe calibration data includes calibration data indicative of the expected electrical loss of the wirelessly rechargeable battery 14 as a function of the expected power loss P Rx losses , or the predicted power loss P of the wirelessly rechargeable battery 14 Rx losses The battery controller 42A is configured to determine a predicted electrical consumption of the wirelessly rechargeable battery 14 based on the predicted electrical loss, and to determine a predicted electrical consumption of the wireless charging system 10 based on the predicted electrical consumption of the wirelessly rechargeable battery 14.

[0049] As a further non-limiting example, the non-volatile storage 54B of the charger controller 42B stores calibration data indicative of the expected electrical loss of the wireless charging device 16 when the wirelessly rechargeable battery 14 is placed adjacent to the charging surface 18 of the wireless charging device 16. The expected electrical loss of the wireless charging device 16 may be calculated as the expected power loss P Tx losses , or the expected power loss P of the wireless charging device 16 Tx losses The charger controller 42B is configured to determine a predicted electrical consumption of the wireless charging device 16 based on the predicted electrical loss of the wireless charging device 16, and to determine a predicted electrical consumption of the wireless charging system 10 based on the predicted electrical consumption of the wireless charging device 16.

[0050] 5 illustrates a method 300 for determining whether a foreign object 12 is in proximity to a wireless charging device 16. Method 300 is performed by controller 42. In particular, battery controller 42A is configured to perform one or more blocks of method 300, and charger controller 42B is configured to perform one or more other blocks of method 300.

[0051] At block 302, a determination is made as to whether a predetermined event has occurred. In particular, at least one controller 42, such as charger controller 42B, is configured to monitor for the occurrence of one or more predetermined events. In response to detecting the occurrence of one of the one or more predetermined events, the controller 42 is configured to trigger a foreign object detection cycle.

[0052] One of the predetermined events monitored by at least one of the controllers 42 is the wirelessly rechargeable battery 14 being placed in proximity to the charging surface 18 of the wireless charging device 16. In one example, the charger controller 42B may be configured to monitor the supply current i supply More specifically, the charger controller 42B is configured to periodically output an AC signal through the transmission coil 24 to the DC / AC converter 26, which in turn controls the supply current i of the power supply signal output by the power source 20 to be equal to or greater than the predetermined event. supply When the wirelessly rechargeable battery 14 is placed in proximity to the charging surface 18 of the wireless charging device 16, the output power supply signal induces electrical energy in the receiving coil 30, and correspondingly, the supply current i of the power supply signal supply Therefore, the charger controller 42B increases the measured supply current i supply is configured to determine whether the wirelessly rechargeable battery 14 is in proximity to the charging surface 18 of the wireless charging device 16 by determining whether the measured supply current i supply has increased to a value above a predetermined threshold, the charger controller 42B is configured to determine that the wirelessly rechargeable battery 14 has been placed in proximity to the charging surface 18 of the wireless charging device 16.

[0053] As a further example, at least one of the controllers 42 may be configured to determine whether the wirelessly rechargeable battery 14 is placed adjacent to the charging surface 18 of the wireless charging device 16 using the communication device 44. In particular, one of the communication devices 44, also referred to as the signaling communication device 44, is configured to periodically announce a beacon signal that is received by the other communication device 44, also referred to as the acknowledgement communication device 44, when the wirelessly rechargeable battery 14 is placed adjacent to the charging surface 18 of the wireless charging device 16. In one example, the communication device 44B is configured as the signaling communication device 44 and the communication device 44A is configured as the acknowledgement communication device 44. In response to the wirelessly rechargeable battery 14 being placed adjacent to the charging surface 18 of the wireless charging device 16, the acknowledgement communication device 44 receives the beacon signal and responsively communicates an acknowledgement signal to the signaling communication device 44. The signaling communication device 44 then transmits a signal to the controller 42 connected to the signaling communication device 44 to indicate that the wirelessly rechargeable battery 14 is now adjacent to the charging surface 18 of the wireless charging device 16.

[0054] In some examples, in response to determining that the wirelessly rechargeable battery 14 is placed adjacent to the charging surface 18 of the wireless charging device 16, at least one of the controllers 42 is configured to verify that the wirelessly rechargeable battery 14 and the wireless charging device 16 are compatible. For example, the non-volatile storage 54 of each controller 42 stores authentication data. One of the controllers 42, such as the charger controller 42B, is configured to communicate its stored authentication data to the other controller 42 through the communication device 44. The other controller 42 is then configured to determine whether the received authentication data matches the authentication data stored in its non-volatile storage 54. In response to determining that the received authentication data matches its authentication data, the other controller 42 is configured to determine that the wirelessly rechargeable battery 14 and the wireless charging device 16 are compatible.

[0055] A foreign object detection cycle is triggered in response to determining the occurrence of a predetermined event, such as the wirelessly rechargeable battery 14 being placed adjacent to the charging surface 18 of the wireless charging device 16 (a positive determination at block 302) and / or authenticating the wirelessly rechargeable battery 14 for use with the wireless charging device 16 at block 304. To this end, the controller 42 that has determined the occurrence of the predetermined event and / or authenticated the wirelessly rechargeable battery 14 for use with the wireless charging device 16 is configured to communicate a signal via the communications device 44 to the other controller 42 instructing it to begin performing a foreign object detection cycle.

[0056] In block 306, the transmit coil 24 is energized to transmit power to the receive coil 30 of the wirelessly rechargeable battery 14. In particular, the charger controller 42B is configured to cause the DC / AC converter 26 to generate an AC signal through the transmit coil 24 from the supply power signal received from the power source 20. The AC signal through the transmit coil 24 generates an electromagnetic field that induces a corresponding AC signal in the receive coil 30.

[0057] In block 308, foreign object detection is performed within the wirelessly rechargeable battery 14. In particular, the battery controller 42A is configured to engage the switch 48B and release the engaged switch 48A such that the receive coil 30 is connected to the electrical load 46 and disconnected from the battery cell 38. In this manner, a portion of the power provided from the wireless charging device 16 to the wirelessly rechargeable battery 14 is supplied to and dissipated by the electrical load 46.

[0058] In block 310, an electrical characteristic of the power supply signal output by the power supply 20 is measured. By way of example, the measured electrical characteristic may be the supply power P provided by the power supply signal. supply or the supply current i supply The measured electrical characteristic of the power delivery signal is used as the actual electrical consumption of the wireless charging system 10, as described above. The charger controller 42B is configured to determine the electrical characteristic of the power delivery signal using the sensor 40B.

[0059] In block 312, the predicted electrical loss of the wireless charging device 16 is determined. The predicted electrical loss of the wireless charging device 16 is treated as a constant value, and therefore is measured and stored as calibration data in the non-volatile storage device 54B of the charger controller 42B before distribution. In particular, after manufacturing the wireless charging device 16, with no foreign object 12 or wirelessly rechargeable battery 14 in close proximity to the charging surface 18 of the wireless charging device 16, the technician causes the power source 20 to generate a power supply signal, which generates an AC signal through the transmitting coil 24. In the absence of the foreign object 12 and the wirelessly rechargeable battery 14, the operational power supply signal corresponds to the electrical loss of the wireless charging device 16. In other words, the supply current i supply and the supply voltage v supply The power of the power supply signal P is given by the product of supply , or simply the supply current i supply is measured and used as the predicted electrical loss of the wireless charging device 16. In response to such a determination of the electrical loss of the wireless charging device 16, calibration data indicative of the determined electrical loss of the wireless charging device 106 is stored in the non-volatile storage 54B of the charger controller 42B. Thereafter, in block 312, the charger controller 42B is configured to determine the predicted electrical loss of the wireless charging device 16 by reading the calibration data from the non-volatile storage 54B.

[0060] In block 314, an electrical characteristic of the electrical load 46 is determined. For example, the battery controller 42A is configured to measure the electrical characteristic of the electrical load 46 using the sensor 40A. More specifically, the battery controller 42A determines the load voltage v load and the load current i load by measuring the load voltage v and multiplying these two values ​​together, or load , and dividing the square of this value by the impedance of the electrical load 46, as the determined electrical characteristic of the fixed electrical load 46. loadAlternatively, the battery controller 42A may be configured to measure the load current i load Alternatively, because the voltage from the voltage regulator 34 is substantially constant during each foreign object detection cycle, the determined electrical characteristic of the electrical load 46, such as 11.2 volts, remains substantially constant during each foreign object detection cycle. load or current i load Such electrical characteristics are predetermined and stored as calibration data in the non-volatile storage device 54A of the battery controller 42A, such as before distribution of the wirelessly rechargeable battery 14. Thereafter, in response to a foreign object detection cycle being triggered on the wirelessly rechargeable battery 14, the battery controller 42A is configured to determine the electrical characteristics of the electrical load 46 by reading the electrical characteristics from the calibration data stored in the non-volatile storage device 54A.

[0061] In block 316, the induced voltage in the wirelessly rechargeable battery 14 by the wireless charging device 16 is measured. More specifically, the AC signal generated through the receiving coil 30 is fed to a voltage rectifier 32, which rectifies the received voltage v rec The battery controller 42A uses the sensor 40A to measure the received voltage v rec Alternatively, the battery controller 42A may be configured to measure and use the AC voltage through the receive coil 30 as the measured voltage induced in the wirelessly rechargeable battery 14 by the wireless charging device 16.

[0062] In block 318, the predicted electrical loss of the wirelessly rechargeable battery 14 is calculated based on the received voltage v rec As previously explained, a positional deviation of the wirelessly rechargeable battery 14 relative to the wireless charging device 16 will cause a different voltage to be induced in the wirelessly rechargeable battery 14, which will correspondingly cause a different electrical loss in the wirelessly rechargeable battery 14. Therefore, the battery controller 42A determines whether the received voltage v recThe foreign object 12 may be configured to determine a predicted electrical loss of the wirelessly rechargeable battery 14 based on the measured induced voltage, such as the measured voltage induced in the wirelessly rechargeable battery 14. The determined predicted electrical loss of the wirelessly rechargeable battery 14 corresponds to an electrical loss of the wirelessly rechargeable battery 14 that previously occurred in the absence of the foreign object 12 when the measured voltage is induced in the wirelessly rechargeable battery 14.

[0063] More specifically, the non-volatile storage device 54A of the battery controller 42A stores calibration data indicative of changes in predicted electrical loss of the wirelessly rechargeable battery 14 corresponding to changes in the position of the wirelessly rechargeable battery 14 relative to the wireless charging device 16 in the absence of the foreign object 12. Each change in predicted electrical loss is associated with the calibration data for a different voltage that, when induced in the wirelessly rechargeable battery 14 by the wireless charging device 16 in the absence of the foreign object 12, will cause the wirelessly rechargeable battery 14 to experience electrical loss corresponding to the predicted electrical loss associated with that voltage. The battery controller 42A is thus configured to determine the predicted electrical loss of the wirelessly rechargeable battery 14 based on the induced voltage measured in the wirelessly rechargeable battery 14 by determining the predicted electrical loss indicated in the calibration data associated with the measured induced voltage in the calibration data.

[0064] FIG. 6 illustrates a graph 402 represented by the calibration data stored in the non-volatile memory 52A of the battery controller 42A to determine the predicted electrical loss of the wirelessly rechargeable battery 14. The Y-axis of the graph represents the change in the predicted power loss of the wirelessly rechargeable battery 14 when the foreign object 12 is not present, and the X-axis represents the change in the voltage induced in the wirelessly rechargeable battery 14 by the wireless charging device 16 and measured by the battery controller 42A in block 316. According to the graph 402, the relationship between the predicted power loss of the wirelessly rechargeable battery 14 when the foreign object 12 is not present and the induced voltage measured in the wirelessly rechargeable battery 14 is defined by a function 404, which is a non-linear decreasing function. In other words, assuming that the foreign object 12 is not present, the induced voltage v received in the wirelessly rechargeable battery 14 decreases as the distance between the wirelessly rechargeable battery 14 and the wireless charging device 16 decreases. recincreases, and the predicted electrical loss of the wirelessly rechargeable battery 14 decreases.

[0065] In an alternative example, the relationship between the expected power loss of the wirelessly rechargeable battery 14 in the absence of the foreign object 12 and the induced voltage measured in the wirelessly rechargeable battery 14 may be defined by a U-shaped function 404. More specifically, when the receiving coil 30 initially moves closer to the transmitting coil 24 from the maximum distance at which the wirelessly rechargeable battery 14 can be charged by the wireless charging device 16, the induced voltage in the wirelessly rechargeable battery 14 increases and the expected power loss of the wirelessly rechargeable battery 14 decreases. However, as the receiving coil 30 continues to move closer to the transmitting coil 24, at some point, eddy currents may be induced in the metallic components of the wirelessly rechargeable battery 14 that increase the expected power loss of the wirelessly rechargeable battery 14. Thus, the induced voltage in the wirelessly rechargeable battery 14 increases while the expected power loss of the wirelessly rechargeable battery 14 increases, resulting in a U-shaped waveform.

[0066] The calibration data stored in the non-volatile storage 54A of the battery controller 42A is determined by measuring the electrical losses of the wirelessly rechargeable battery 14 when the wirelessly rechargeable battery 14 is in the foreign object detection configuration and in the absence of the foreign object 12 and is placed in various positions adjacent to the charging surface 18 of the wireless charging device 16 such that the distance between the receiving coil 30 and the transmitting coil 24 varies. In particular, for each position of the wirelessly rechargeable battery 14 relative to the wireless charging device 16, the induced voltage in the wirelessly rechargeable battery 14 by the wireless charging device 16, the electrical characteristics of the electrical load 46, the electrical characteristics of the power supply signal output by the power source 20, and the electrical losses of the wireless charging device 16 are determined. As explained above, the electrical losses of the wireless charging device 16 are stored as calibration data in the non-volatile storage 54B of the charger controller 42B, and other data are measured by the controller 42. The electrical losses of the wirelessly rechargeable battery 14 are determined based on the data. For example, one of the controllers 42 may be configured to subtract the electrical characteristics of the electrical load 46 and the electrical losses of the wireless charging device 16 from the electrical characteristics of the power supply signal to determine the electrical losses of the wirelessly rechargeable battery 14 due to the current position of the wirelessly rechargeable battery 14 relative to the wireless charging device 16.

[0067] Thus, the controller 42 generates a calibration sample 406 for each position of the wirelessly rechargeable battery 14 relative to the wireless charging device 16, with each calibration sample 406 including the measured induced voltage in the wirelessly rechargeable battery 14 due to the wireless charging device 16 and the corresponding electrical loss of the wirelessly rechargeable battery 14 when the foreign object 12 is not present. Calibration data for determining a predicted electrical loss of the wirelessly rechargeable battery 14 based on the measured induced voltage in the wirelessly rechargeable battery 14 may then be determined based on the calibration samples 406.

[0068] For example, the controller 42 is configured to apply a curve fitting algorithm, such as nonlinear regression, to the calibration sample 406 to generate the function 404 and communicate the calibration sample 406 to the test device. The test device generates calibration data indicative of the function 404 and communicates such calibration data to the battery controller 42A for storage in the nonvolatile storage 54A of the battery controller 42A. During a subsequent foreign object detection cycle, the battery controller 42A is configured to apply the measured induced voltage in the wirelessly rechargeable battery 14 to the function 404 indicated by the calibration data to determine a predicted electrical loss of the wirelessly rechargeable battery 14. As a further example, the controller 42 and / or the test device may be configured to generate a look-up table including samples obtained from the calibration sample 406 or the determined function 404 and store the calibration data indicated by the look-up table in the nonvolatile storage 54A of the battery controller 42A. During subsequent foreign object detection cycles, the battery controller 42A is configured to interpolate the predicted electrical loss of the wirelessly rechargeable battery 14 from the indicated look-up table based on the measured induced voltage within the wirelessly rechargeable battery 14.

[0069] In some examples, at least one of the controllers 42 of the wireless charging system 10 may be configured to adjust the calibration data, such as the function 404 indicated by the calibration data, at runtime, based on, for example, measured electrical characteristics of the wireless charging system 10. For example, at least one of the controllers 42, such as controller 42B, may adjust the supply voltage v of the power delivery signal. supplyis configured to adjust the function 404 in response to determining that the inductance of the receive coil 30 and / or the transmit coil 24 is different from that used to generate the calibration data. As another example, at least one of the controllers 42 may be configured to adjust the function 404 in response to determining that the inductance of the receive coil 30 and / or the transmit coil 24 is different from that used to determine the calibration data. As a further example, at least one of the controllers 42, such as controller 42A, may be configured to adjust the function 404 based on a measured temperature of the wirelessly rechargeable battery 14. To this end, the sensor 40A of the battery control circuitry 36 may also include a temperature sensor configured to generate data indicative of the temperature of the wirelessly rechargeable battery 14.

[0070] In block 320, one of the controllers 42, for example using the communication device 44, aggregates the data determined by the controller 42. For example, the charger controller 42B is configured to communicate the electrical characteristics of the power supply signal output by the power source 20 and the electrical loss of the wireless charging device 16 to the battery controller 42A. Alternatively, the battery controller 42A may be configured to communicate data indicative of the predicted electrical loss of the wirelessly rechargeable battery 14 and the electrical characteristics of the electrical load 46 to the charger controller 42B. For example, the battery controller 42A may be configured to communicate each of the predicted electrical loss of the wirelessly rechargeable battery 14 and the electrical characteristics of the electrical load 46 to the charger controller 42B, or to communicate the sum of the predicted electrical loss of the wirelessly rechargeable battery 14 and the electrical characteristics of the electrical load 46 to the charger controller 42B.

[0071] In block 322, a predicted electrical consumption of the wireless charging system 10 is determined based on the aggregated data. More specifically, the data aggregated controller 42 is configured to determine a predicted electrical consumption of the wireless charging system 10 based on the electrical losses of the wireless charging device 16, the predicted electrical losses of the wirelessly rechargeable battery 14, and the electrical characteristics of the stationary electrical load 46. For example, the controller 42 is configured to sum these items to determine a predicted electrical consumption of the wireless charging system 10. As previously described, the predicted electrical consumption of the wireless charging system 10 may not include electrical losses corresponding to the foreign object 12 in proximity to the wireless charging device 16.

[0072] In block 324, the actual electrical consumption of the wireless charging system 10 is compared to the predicted electrical consumption of the wireless charging system 10. In particular, the data aggregated controller 42 is configured to determine a difference between the actual electrical consumption of the wireless charging system 10 and the predicted electrical consumption of the wireless charging system 10. As previously described, the measured electrical characteristic of the power delivery signal is used as the actual electrical consumption of the wireless charging system 10.

[0073] In an alternative example, the actual electrical consumption of the wireless charging system 10 may be based on both the determined electrical characteristics of the power supply signal output by the power source 20 and the determined electrical loss of the wireless charging device 16. For example, the actual electrical consumption of the wireless charging system 10 may be set as the sum of these two values, which corresponds to the transmission power of the wireless charging device 16. In this case, the predicted electrical consumption of the wireless charging system 10 is based on the determined predicted electrical loss of the wireless battery 14 and the determined electrical characteristics of the electrical load 46. For example, the predicted electrical consumption of the wireless charging system 10 may be set as the sum of these two values, which corresponds to the predicted electrical consumption of the wireless rechargeable battery 16. As in the previous example, the actual electrical consumption of the wireless charging system 10 corresponds to the actual electrical consumption by the wireless rechargeable battery 14 and the foreign object 12, if present, and the predicted electrical consumption of the wireless charging system 10 corresponds to the predicted electrical consumption of the wireless rechargeable battery 14 assuming that the foreign object 12 is not present.

[0074] In these alternative examples, the battery controller 42A is configured to determine the predicted electrical consumption of the wireless charging system 10 based on the data determined by the battery controller 42A, i.e., the predicted electrical loss of the wirelessly rechargeable battery 14 and the electrical characteristics of the electrical load 46, and the charger controller 42B is configured to determine the actual electrical consumption of the wireless charging system 10 based on the data determined by the charger controller 42B, i.e., the electrical characteristics of the power supply signal output by the power source 20 and the electrical loss of the wireless charging device 16. In particular, each controller 42 is configured to sum its determined data. Then, the battery controller 42A is configured to communicate the predicted electrical consumption of the wireless charging system 10 to the charger controller 42B, or the charger controller 42B is configured to communicate the actual electrical consumption of the wireless charging system 10 to the battery controller 42A, for aggregating the data in block 320. Alternatively, one of the controllers 42 may be configured to communicate its determined data items to the other controller 42, which performs the summation to determine the actual and predicted electrical consumption. Thereafter, in block 324, the data aggregated controller 24 is configured to compare the actual electrical consumption of the wireless charging system 10 to the predicted electrical consumption of the wireless charging system 10, for example, by determining a difference between the actual electrical consumption of the wireless charging system 10 and the predicted electrical consumption of the wireless charging system 10.

[0075] At block 326, regardless of whether the electrical characteristics of the power source were used as the actual electrical consumption of the wireless charging system 10 or whether the actual electrical consumption of the wireless charging system 10 was determined based on the electrical characteristics of the power source and the electrical losses of the wireless charging device 16, a determination is made, for example by the data aggregated controller 42, whether the difference determined at block 324 is greater than or equal to a predetermined threshold. The predetermined threshold is stored in the non-volatile storage 54 of the data aggregated controller 42 as a constant value or in a look-up table. In some examples, the predetermined threshold is the maximum power P that the foreign object 12 can dissipate without reaching an unsafe temperature. FO In some examples, referring to FIG. 4, the predetermined threshold corresponds to an average of the difference between the black line and the dotted line, or a minimum of the difference between the black line and the dotted line. In other examples, the predetermined threshold used in the comparison of block 326 may vary based on electrical characteristics of the wireless charging system 10 measured at run-time. For example, referring to FIG. 4, the controller 42 is configured to use a predetermined threshold that corresponds to a value between the black line and the dotted line, e.g., a median value, in the induced voltage measured by the battery controller 42A.

[0076] In response to determining that the difference between the actual and predicted electrical consumption does not exceed the predetermined threshold (a negative determination at block 326), a charging cycle is triggered at block 328. To this end, the battery controller 42A is configured to engage the switch 48A and release the switch 48b such that the receiving coil 30 is connected to the battery cell 38 and is disconnected from the electrical load 46. Furthermore, the wireless charging device 16 outputs a signal through the transmitting coil 24 to charge the battery cell 38. For example, the battery controller 42A may be configured to control the load current i load The wireless charging device 16 is configured to communicate a current setpoint indicative of a target current of 1.4 amps to the voltage regulator 34. For example, the target current is 1.4 amps. In response to a charge cycle being triggered, the voltage regulator 34 is configured to obtain a current from the wireless charging device 16 that enables the voltage regulator 34 to provide the target current to the battery cell 38.

[0077] Instead, in response to determining that the difference between the actual and predicted electrical consumption exceeds the predetermined threshold (positive determination of block 326), in block 330, it is determined that the foreign object 12 is in proximity to the wireless charging device 16. Thereafter, in block 332, the transmitting coil 24 is deactivated. In particular, the charger controller 42B is configured to prevent the DC / AC converter 26 from outputting a power supply signal through the transmitting coil 24 to charge the battery cell 38. In block 334, an alarm of the wireless charging system 10 is issued. The alarm is an audible, visual, or tactile alarm. For example, the wireless charging device 16 may include a speaker configured to issue an audible alarm. The wireless charging device 16 may also include a light-emitting device, such as the light-emitting device 508 configured to emit light in response to detection of the foreign object 12, as shown in FIG. 8 . The wireless charging device 16 may further include a vibration motor configured to vibrate in response to detection of the foreign object 12.

[0078] In response to triggering an alert at block 334 or triggering a charging cycle at block 328, the method 300 returns to block 302 for continued monitoring of one or more predetermined events. In addition to the wirelessly rechargeable battery 14 being placed in proximity to the wireless charging device 16, the one or more predetermined events monitored by the wireless charging system 10 include the passage of a predetermined time since the performance of the last foreign object detection cycle. For example, the wireless charging system 10 may be configured to trigger a foreign object detection cycle every five minutes since the last foreign object detection cycle performed by the wireless charging system 10.

[0079] In some examples, the one or more predetermined events monitored by the wireless charging system 10 also include a bump detection event. As described above, during a charging cycle, the charger controller 42B supplies a constant load current i loadThe battery cell 38 is configured to implement a constant current charging technique provided to charge the battery cell 38. As the battery cell 38 is charged, however, the battery voltage increases, which increases the effective impedance of the battery cell 38 and correspondingly increases the load current i load In response, the wireless rechargeable battery 14, or more specifically the voltage regulator 34, reduces the load current i load At the target level, the power supply P supply and the supply current i supply 7, the solid line indicates the load current i load Supply power P over time for charging the wirelessly rechargeable battery 14 supply 4 illustrates an example output curve showing:

[0080] The power supply signal P supply and the supply current i supply is the load current i load However, the power supply signal P supply and the supply current i load Also, the foreign object 17 is charged with more power P from the wireless charging system 10. FO 7, the dotted line represents the power supply P that may occur in response to a shock event. supply This illustrates the changes in

[0081] Thus, during a charging cycle, the charger controller 42B is configured to monitor an electrical characteristic of the power delivery signal provided by the wireless charging device 16 and determine the occurrence of an impact event based on the monitoring of the electrical characteristic. For example, the electrical characteristic may be the delivery power P of the power delivery signal output by the power source 20. supply , or the supply current i of the power supply signal supplyThe charger controller 42B is configured to continuously track the difference between the current level of the electrical characteristic and the initial level of the electrical characteristic at the start of the current charging cycle and determine whether the difference is greater than or equal to a predetermined threshold. The predetermined threshold corresponds to a predetermined increase in the total power consumption of the wireless charging system 10. As an example, the predetermined increase is 400 milliwatts. In other words, the charger controller 42B may ... supply and configured to determine the occurrence of a predetermined event in response to a 400 milliwatt increase in power.

[0082] In response to detecting at least one of the one or more predetermined events (a positive determination at block 302), another foreign object detection cycle is triggered at block 304. Thus, in response to the wirelessly rechargeable battery 14 being placed in proximity to the wireless charging device 16, the wireless charging system 10 is configured to perform an object detection cycle to account for between charging cycles in which the wireless charging device 16 charges the wirelessly rechargeable battery 14. During each foreign object detection cycle, the wireless charging system 10 may be configured to refrain from charging the battery cells 38 and determine whether the foreign object 12 is in proximity to the wireless charging device 16.

[0083] FIG. 8 illustrates a wireless charging device 500 for charging several wirelessly rechargeable batteries 14 simultaneously. More specifically, the wireless charging device 500 includes a controller 502, a power source 504, and several charging bays 506. Each charging bay 506 includes a transmitting coil 24 for providing power to the receiving coil 30 of the wirelessly rechargeable battery 14 disposed in the charging bay 506. The transmitting coil 24 of each charging bay 506 is connected to the power source 504, such as through a DC / AC converter. The controller 502 and the power source 504 are configured to mirror and perform the same functions as the power source 20 and the charger controller 42B of the wireless charging device 16 described above, except for each charging bay 506. In other words, the controller 502 is configured to assist in the execution of a charging cycle and a foreign object detection cycle for each charging bay 506, as described above.

[0084] The wireless charging device 500 may be configured to charge wirelessly rechargeable batteries 14 housed in a sterilizable container disposed on the wireless charging device 500, such as the sterilizable container 600 shown in FIG. 9. In particular, one or more wirelessly rechargeable batteries 14 are placed in the sterilizable container 600 after sterilization. The sterilizable container 600 is also sterilized (e.g., by autoclaving) to maintain the sterility of the volume housed therein. In other words, the sterilizable container 600 provides a microbial barrier such that the volume within the sterilizable container 600 remains sterile until the sterilizable container 600 is opened.

[0085] Alternatively, the wireless rechargeable battery 14 may be placed in the sterilizable container 600 prior to sterilization. The sterilizable container 600 is then sterilized via autoclaving (or other suitable sterilization process) with the wireless rechargeable battery 14 contained within the sterilizable container 600. Thus, both the wireless rechargeable battery 14 and the sterilizable container 600 are sterilized, and the volume within the sterilizable container 600 is sterilized or maintained in a sterile state.

[0086] After using either of the above methods to sterilize the wireless rechargeable batteries 14, the sterilizable container 600 is carried or transported to a desired location of use while maintaining the sterility of the wireless rechargeable batteries 14 and the sterile volume. For example, the sterilizable container 600 is then placed on the wireless charging device 500 such that each wireless rechargeable battery 14 placed in the sterilizable container 600 is placed on the transmitting coil 24 of a different charging bay 506. In this manner, the wireless charging device 500 can provide charging power to the wireless rechargeable batteries 14 while the wireless rechargeable batteries 14 remain microbially sealed within the sterile volume. Each wireless rechargeable battery 14 can also communicate with the wireless charging device 500 while the wireless rechargeable battery 14 is maintained within the sterile volume to obtain battery operation data, battery status data, and / or any other suitable data as set forth herein. While the wireless rechargeable battery 14 is being transported to the wireless charging device 500, the wireless rechargeable battery 14 and its internal components are in a low power state.

[0087] In another example, the wireless rechargeable battery 14 is placed in a sterilizable container 600 prior to sterilization, and the sterilizable container 600 is placed in proximity to the wireless charging device 500 such that the wireless rechargeable battery 14 receives charging power while the sterilizable container 600 and wireless rechargeable battery 14 are in a non-sterile state. In such an example, after the wireless rechargeable battery 14 receives charging power from the wireless charging device 500, the sterilizable container 600 and wireless rechargeable battery 14 are sterilized in an autoclave or other sterilization process, and the wireless rechargeable battery 14 is housed in a sterile and charged state until the sterilizable container 600 is opened. Alternatively, the wireless rechargeable battery 14 may be charged using the wireless charging device 500 and then placed in the sterilizable container 600 and sterilized.

[0088] Rather than a sterilizable container 600, the wirelessly rechargeable battery 14 may be placed in blue wrap, sterilized, and charged using any of the above methods. Thus, the wirelessly rechargeable battery 14 may be charged through the blue wrap while being maintained in a sterile condition.

[0089] It should be noted that the wirelessly rechargeable battery 14 may be replaced with any power-receiving device configured to receive and recharge power. For example, the power-receiving device may be a surgical instrument configured to store an electrical charge. The power-receiving device may also be a cooling device configured to store an electrical charge, or a light-emitting device configured to store an electrical charge.

[0090] Several exemplary embodiments have been discussed in the foregoing description. However, the examples discussed herein are not intended to be exhaustive or to limit the invention to any particular form. The terminology used herein is intended to be of a descriptive nature rather than a limiting nature. Many modifications and variations are possible in light of the above teachings, and the invention may be practiced otherwise than as specifically described.

[0091] Examples of the disclosure may be described using the following numbered clauses, with particular features presented in the subclauses.

[0092] Terms 1. A system for detecting a foreign object in proximity to a wireless charging device, comprising: A wireless rechargeable battery, a receiving coil for receiving power from the wireless charging device when in proximity to the wireless charging device; one or more battery cells; Electrical load and A wirelessly rechargeable battery comprising: at least one controller configured to switch the wirelessly rechargeable battery between a first configuration in which the receive coil is connected to one or more battery cells to charge the one or more battery cells and is decoupled from the electrical load, and a second configuration in which the receive coil is connected to an electrical load to power the electrical load and is decoupled from the one or more battery cells; The at least one controller: Measuring an induced voltage in the wirelessly rechargeable battery by the wireless charging device; determining a predicted electrical loss of the wirelessly rechargeable battery as a first electrical characteristic based on the measured voltage; determining a second electrical characteristic of the electrical load when the wirelessly rechargeable battery is in a second configuration; and determining whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics.

[0093] 2. The system of claim 1, wherein the first electrical characteristic is a predicted power loss of the wirelessly rechargeable battery and the second electrical characteristic is a power dissipated by the electrical load.

[0094] 3. The system of claim 1, wherein the first electrical characteristic is a predicted current loss of the wirelessly rechargeable battery and the second electrical characteristic is a current through the electrical load.

[0095] 4. The wireless rechargeable battery, a voltage rectifier coupled to the receiving coil and configured to receive a first voltage from the receiving coil and generate a second voltage from the first voltage; a voltage regulator coupled to the voltage rectifier and configured to receive the second voltage from the voltage rectifier and generate a third voltage from the second voltage; when the wirelessly rechargeable battery is in the first configuration, the one or more battery cells are configured to receive the third voltage from the voltage regulator, and when the wirelessly rechargeable battery is in the second configuration, the electrical load is configured to receive the third voltage from the voltage regulator; 4. The system of any one of clauses 1 to 3, wherein the measured voltage is the second voltage.

[0096] 5. The system described in any one of clauses 1 to 4, wherein the wirelessly rechargeable battery is provided with a non-volatile storage device that stores calibration data specific to the wirelessly rechargeable battery, and the at least one controller is configured to determine the first electrical characteristic based on the measured voltage and the calibration data.

[0097] 6. The system described in clause 5, wherein the calibration data indicates a change in predicted electrical loss of the wirelessly rechargeable battery corresponding to a change in position of the wirelessly rechargeable battery relative to a wireless charging device, each of the predicted electrical losses being associated with a different voltage in the calibration data, and the at least one controller is configured to determine one of the predicted electrical losses indicated in the calibration data associated with the measured voltage in the calibration data, thereby determining the first electrical characteristic based on the measured voltage and the calibration data.

[0098] 7. The system of any one of clauses 1 to 6, wherein the electrical load comprises at least one resistor sized to dissipate the same amount of power as the one or more battery cells when the one or more battery cells are substantially fully charged.

[0099] 8. The system of claim 7, wherein the at least one resistor has a combined resistance of 8.3 ohms.

[0100] 9. The at least one controller: determining a predicted electrical loss of the wireless charging device as a third electrical characteristic; Determining a fourth electrical characteristic of a power delivery signal generated by the wireless charging device; and determining whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics.

[0101] 10. The system described in clause 9, wherein the third electrical characteristic is a predicted power loss of the wireless charging device and the fourth electrical characteristic is a supply power generated by the power supply signal.

[0102] 11. The system of claim 9, wherein the third electrical characteristic is a predicted current loss of the wireless charging device and the fourth electrical characteristic is a supply current of the power supply signal.

[0103] 12. The wirelessly rechargeable battery comprises a first communication device for communicating with a second communication device of the wireless charging device when the wirelessly rechargeable battery is in proximity to the wireless charging device, and the at least one controller includes a battery controller integrated in the wirelessly rechargeable battery, the battery controller comprising: measuring the induced voltage in the wirelessly rechargeable battery by the wireless charging device; determining the first electrical characteristic based on the measured voltage; and Measuring the second electrical characteristic; and receiving the third and fourth electrical characteristics from the wireless charging device through the first and second communication devices; and determining whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics.

[0104] 13. The wireless charging device further comprises a charger controller integrated into the wireless charging device, the charger controller further comprising: determining the third electrical characteristic; and Measuring the fourth electrical characteristic; and and communicating the third and fourth electrical characteristics to the battery controller through the first and second communication devices.

[0105] 14. The wirelessly rechargeable battery comprises a first communication device for communicating with a second communication device of the wireless charging device when the wirelessly rechargeable battery is in proximity to the wireless charging device, and the at least one controller includes a battery controller integrated in the wirelessly rechargeable battery, the battery controller comprising: measuring the induced voltage in the wirelessly rechargeable battery by the wireless charging device; determining the first electrical characteristic based on the measured voltage; and Measuring the second electrical characteristic; and and transmitting the first and second electrical characteristics to the wireless charging device through the first and second communication devices.

[0106] 15. The wireless charging device further includes a charger controller integrated into the wireless charging device, the charger controller comprising: receiving the first and second electrical characteristics; determining the third electrical characteristic; and Measuring the fourth electrical characteristic; and and determining whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics.

[0107] 16. The system described in any one of clauses 9 to 15, wherein the wireless charging device comprises a non-volatile storage device that stores calibration data indicative of the third electrical characteristic, and the at least one controller is configured to determine the third electrical characteristic by reading the calibration data from the non-volatile storage device.

[0108] 17. The at least one controller: determining a fifth electrical characteristic based on the first, second, and third electrical characteristics, a predicted electrical consumption of the system; and determining whether a difference between the fifth electrical characteristic and the fourth electrical characteristic is greater than or equal to a predetermined threshold; The system described in any one of clauses 9 to 16, wherein the system is configured to determine whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics, and in response to determining that the difference between the fifth electrical characteristic and the fourth electrical characteristic is greater than or equal to the predetermined threshold, determine that a foreign object is in proximity to the wireless charging device.

[0109] 18. The at least one controller: triggering a charging cycle in response to determining that a foreign object is not proximate to the wireless charging device; 18. The system of any one of clauses 1 to 17, configured to disable charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device.

[0110] 19. In response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device, the at least one controller is configured to perform foreign object detection cycles interspersed with charging cycles, and during each of the foreign object detection cycles, the at least one controller: switching the wirelessly rechargeable battery to the second configuration; measuring the induced voltage in the wirelessly rechargeable battery by the wireless charging device; determining the first electrical characteristic based on the measured voltage; and determining the second electrical characteristic; determining whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics; triggering one of the charging cycles in response to determining that a foreign object is not proximate to the wireless charging device; in response to determining that a foreign object is in proximity to the wireless charging device, disabling charging of the wirelessly rechargeable battery; 19. The system of any one of clauses 1 to 18, wherein during each of the charging cycles, the at least one controller is configured to switch the wirelessly rechargeable battery to the first configuration.

[0111] 20. The system of clause 19, wherein the at least one controller is configured to trigger each of the foreign object detection cycles in response to detection of at least one of one or more predetermined events.

[0112] 21. The system of clause 20, wherein the one or more predetermined events include the wirelessly rechargeable battery being placed in proximity to the wireless charging device.

[0113] 22. The system of clause 20 or 21, wherein the one or more predetermined events include the passage of a predetermined time since the last foreign object detection cycle.

[0114] 23. The system of any one of clauses 20 to 22, wherein the one or more predetermined events include a predetermined increase in power supplied by the wireless charging device since the last foreign object detection cycle.

[0115] 24. A wireless charging device, comprising: a transmitting coil for transmitting power to the wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the transmitting coil; a power source connected to the transmit coil and configured to generate a power supply signal for powering the transmit coil; determining a first electrical characteristic of the power supply signal; determining a predicted electrical loss of the wireless charging device as a second electrical characteristic; and determining whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics. At least one controller and A wireless charging device comprising:

[0116] 25. The wireless charging device of clause 24, wherein the first electrical characteristic is a supply power provided by the power supply signal and the second electrical characteristic is a predicted power loss of the wireless charging device.

[0117] 26. The wireless charging device of clause 24, wherein the first electrical characteristic is a supply current of the power supply signal and the second electrical characteristic is an expected current loss of the wireless charging device.

[0118] 27. The wireless charging device further includes a first communication device for communicating with a second communication device of the wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the wireless charging device, and the at least one controller: determining the first and second electrical characteristics; receiving from the wirelessly rechargeable battery through the first and second communication devices, as a third electrical characteristic, a predicted electrical loss of the wirelessly rechargeable battery and a fourth electrical characteristic of an electrical load of the wirelessly rechargeable battery; and determining whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics.

[0119] 28. The wireless charging device of clause 27, wherein the third electrical characteristic is a predicted power loss of the wirelessly rechargeable battery and the fourth electrical characteristic is the power dissipated by the electrical load.

[0120] 29. The wireless charging device of clause 27, wherein the third electrical characteristic is a predicted current loss of the wirelessly rechargeable battery and the fourth electrical characteristic is a current through the electrical load.

[0121] 30. A wireless charging device as described in any one of clauses 24 to 29, further comprising a non-volatile storage device that stores calibration data indicative of the second electrical characteristic, and wherein the at least one controller is configured to determine the second electrical characteristic by reading the calibration data from the non-volatile storage device.

[0122] 31. The at least one controller: determining a fifth electrical characteristic based on the second, third, and fourth electrical characteristics, a predicted electrical consumption of the system; and determining whether a difference between the fifth electrical characteristic and the first electrical characteristic is greater than or equal to a predetermined threshold; The wireless charging device described in any one of clauses 24 to 30, wherein the wireless charging device is configured to determine whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics, and to determine that the foreign object is in proximity to the wireless charging device in response to determining that the difference between the fifth electrical characteristic and the first electrical characteristic is greater than or equal to the predetermined threshold.

[0123] 32. A wireless charging device as described in any one of clauses 24 to 31, wherein the at least one controller is configured to disable charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device.

[0124] 33. In response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device, the at least one controller is configured to perform foreign object detection cycles interspersed with charging cycles, and during each of the foreign object detection cycles, the at least one controller: determining the first electrical characteristic of the power supply signal; determining the second electrical characteristic; determining whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics; triggering one of the charging cycles in response to determining that a foreign object is not proximate to the wireless charging device; 33. The wireless charging device of any one of clauses 24 to 32, configured to: disable charging in response to determining that a foreign object is in proximity to the wireless charging device.

[0125] 34. The wireless charging device of clause 33, wherein the at least one controller is configured to trigger each of the foreign object detection cycles in response to detection of at least one of one or more predetermined events.

[0126] 35. The wireless charging device of clause 34, wherein the one or more predetermined events include the wirelessly rechargeable battery being placed in proximity to the wireless charging device.

[0127] 36. A wireless charging device as described in clause 34 or 35, wherein the one or more predetermined events include the passage of a predetermined time since the last foreign object detection cycle.

[0128] 37. A wireless charging device as described in any one of clauses 34 to 36, wherein the one or more predetermined events include a predetermined increase in power supplied by the wireless charging device since the last foreign object detection cycle.

[0129] 38. A method for detecting a foreign object in proximity to a wireless charging system including a wireless charging device and a wirelessly rechargeable battery, the wirelessly rechargeable battery having a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device, one or more battery cells, and an electrical load, the method comprising: switching the wirelessly rechargeable battery to a first configuration in which the receive coil is connected to an electrical load to supply power to the electrical load and is decoupled from the one or more battery cells; Measuring an induced voltage in the wirelessly rechargeable battery by the wireless charging device; determining a predicted electrical loss of the wirelessly rechargeable battery as a first electrical characteristic based on the measured voltage; determining a second electrical characteristic of the electrical load when the wirelessly rechargeable battery is in the first configuration; and and determining whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics.

[0130] 39. The method of clause 38, wherein the wirelessly rechargeable battery comprises a non-volatile storage device that stores calibration data specific to the wirelessly rechargeable battery, and determining the first electrical characteristic based on the measured voltage includes determining the first electrical characteristic based on the measured voltage and the calibration data.

[0131] 40. Determining a predicted electrical loss of the wireless charging device as a third electrical characteristic; Determining a fourth electrical characteristic of a power delivery signal generated by the wireless charging device; 40. The method of claim 38 or 39, further comprising determining whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics.

[0132] 41. The wirelessly rechargeable battery comprises a first communication device for communicating with a second communication device of the wireless charging device when the wirelessly rechargeable battery is in proximity to the wireless charging device; measuring, by the wirelessly rechargeable battery, the induced voltage in the wirelessly rechargeable battery by the wireless charging device; determining, by the wirelessly rechargeable battery, the first electrical characteristic based on the measured voltage; and receiving, by the wirelessly rechargeable battery, the third and fourth electrical characteristics from the wireless charging device through the first and second communication devices; The method of claim 40, further comprising determining, by the wirelessly rechargeable battery, whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics.

[0133] 42. Determining, by the wireless charging device, the third electrical characteristic; and measuring, by the wireless charging device, the fourth electrical characteristic; 42. The method of claim 41, further comprising communicating, by the wireless charging device through the first and second communication devices, the third and fourth electrical characteristics to the wirelessly rechargeable battery.

[0134] 43. The wirelessly rechargeable battery comprises a first communication device for communicating with a second communication device of the wireless charging device when the wirelessly rechargeable battery is in proximity to the wireless charging device; measuring, by the wirelessly rechargeable battery, the induced voltage in the wirelessly rechargeable battery by the wireless charging device; determining, by the wirelessly rechargeable battery, the first electrical characteristic based on the measured voltage; Measuring the second electrical characteristic by the wirelessly rechargeable battery; 41. The method of claim 40, further comprising communicating, by the wirelessly rechargeable battery, the first and second electrical characteristics to the wireless charging device through the first and second communication devices.

[0135] 44. Receiving, by the wireless charging device, the first and second electrical characteristics through the first and second communication devices; determining, by the wireless charging device, the third electrical characteristic; measuring, by the wireless charging device, the fourth electrical characteristic; Clause 44. The method of clause 43, further comprising determining, by the wireless charging device, whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics.

[0136] 45. The method of any one of clauses 40 to 44, wherein the wireless charging device comprises a non-volatile storage device that stores calibration data indicative of the third electrical characteristic, and determining the third electrical characteristic includes reading the calibration data from the non-volatile storage device.

[0137] 46. ​​Determining whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics; determining a fifth electrical characteristic based on the first, second, and third electrical characteristics, a predicted electrical consumption of the system; and determining whether a difference between the fifth electrical characteristic and the fourth electrical characteristic exceeds a predetermined threshold; and determining that the foreign object is in proximity to the wireless charging device in response to determining that a difference between the fifth electrical characteristic and the fourth electrical characteristic is greater than or equal to the predetermined threshold.

[0138] 47. In response to determining that a foreign object is not proximate to the wireless charging device, switching the wirelessly rechargeable battery to a second configuration in which the receive coil is connected to the one or more battery cells for charging the one or more battery cells and is disconnected from the electrical load; 47. The method of any one of clauses 38 to 46, further comprising disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device.

[0139] 48. The method according to claim 1, further comprising: in response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device, performing foreign object detection cycles interspersed with charging cycles, each of the foreign object detection cycles comprising: switching the wirelessly rechargeable battery to the first configuration; measuring the induced voltage in the wirelessly rechargeable battery by the wireless charging device; determining the first electrical characteristic based on the measured voltage; and determining the second electrical characteristic; determining whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics; triggering one of the charging cycles in response to determining that a foreign object is not proximate to the wireless charging device; in response to determining that a foreign object is in proximity to the wireless charging device, disabling charging of the wirelessly rechargeable battery; 48. The method of any one of clauses 38 to 47, wherein each of the charging cycles includes switching the wirelessly rechargeable battery to a second configuration in which the receiving coil is connected to the one or more battery cells to charge the one or more battery cells and is disconnected from the electrical load.

[0140] 49. Monitoring the occurrence of one or more predetermined events; 49. The method of claim 48, further comprising triggering each of the foreign object detection cycles in response to detection of at least one of the one or more predetermined events.

[0141] 50. The method of clause 49, further comprising triggering one of the foreign object detection cycles in response to determining that the wirelessly rechargeable battery is placed in proximity to the wireless charging device.

[0142] 51. The method of clause 49 or 50, further comprising triggering one of the foreign object detection cycles in response to determining that a predetermined time has elapsed since the last foreign object detection cycle.

[0143] 52. The method of any one of clauses 49 to 51, further comprising triggering one of the foreign object detection cycles in response to a predetermined increase in power supplied by the wireless charging device since a last foreign object detection cycle.

[0144] 53. A method for detecting a foreign object in the vicinity of a wireless charging device comprising: a transmitting coil for transmitting power to a wirelessly rechargeable battery when the wirelessly rechargeable battery is in the vicinity of the transmitting coil; and a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil, the method comprising: determining a first electrical characteristic of the power supply signal; determining a predicted electrical loss of the wireless charging device as a second electrical characteristic; and determining whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics.

[0145] 54. The wireless charging device comprises a first communication device for communicating with a second communication device of the wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the wireless charging device; determining, by the wireless charging device, the first and second electrical characteristics; receiving, by the wireless charging device through the first and second communication devices, from the wirelessly rechargeable battery as a third electrical characteristic, a predicted electrical loss of the wirelessly rechargeable battery, and a fourth electrical characteristic of an electrical load of the wirelessly rechargeable battery; The method of claim 53, further comprising determining, by the wireless charging device, whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics.

[0146] 55. The method of clause 53 or 54, wherein the wireless charging device further comprises a non-volatile storage device that stores calibration data indicative of the second electrical characteristic, and determining the second electrical characteristic includes reading the calibration data from the non-volatile storage device.

[0147] 56. Determining whether the foreign object is in proximity to the wireless charging device based on the first, second, third, and fourth electrical characteristics; determining a fifth electrical characteristic based on the second, third, and fourth electrical characteristics, a predicted electrical consumption of the system; and determining whether a difference between the fifth electrical characteristic and the first electrical characteristic is greater than or equal to a predetermined threshold; and determining that the foreign object is in proximity to the wireless charging device in response to determining that the difference between the fifth electrical characteristic and the first electrical characteristic is greater than or equal to the predetermined threshold.

[0148] 57. The method of any one of clauses 53 to 56, further comprising disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device.

[0149] 58. The method according to claim 1, further comprising: in response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device, performing foreign object detection cycles interspersed with charging cycles, each of the foreign object detection cycles comprising: determining the first electrical characteristic of the power supply signal; determining the second electrical characteristic; determining whether a foreign object is in proximity to the wireless charging device based on the first and second electrical characteristics; triggering one of the charging cycles in response to determining that a foreign object is not proximate to the wireless charging device; 58. The method of any one of clauses 53 to 57, comprising disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device.

[0150] 59. Monitoring the occurrence of one or more predetermined events; 59. The method of claim 58, further comprising triggering each of the foreign object detection cycles in response to detection of at least one of the one or more predetermined events.

[0151] 60. The method of clause 58 or 59, further comprising triggering one of the foreign object detection cycles in response to determining that the wirelessly rechargeable battery has been placed in proximity to the wireless charging device.

[0152] 61. The method of any one of clauses 58 to 60, further comprising triggering one of the foreign object detection cycles in response to determining that a predetermined time has elapsed since the last foreign object detection cycle.

[0153] 62. The method of any one of clauses 58 to 61, further comprising triggering one of the foreign object detection cycles in response to a predetermined increase in power supplied by the wireless charging device since a last foreign object detection cycle. The claims as of the filing are as follows: [Claim 1] 1. A wireless charging system for detecting a foreign object, comprising: a wireless charging device comprising a first controller configured to determine an actual electrical consumption of the wireless charging system; a wirelessly rechargeable battery that receives power from a wireless charging device when in proximity to the wireless charging device, the wirelessly rechargeable battery comprising a second controller configured to measure an induced voltage in the wirelessly rechargeable battery by the wireless charging device; Equipped with the first controller, the second controller, or a combination of the first and second controllers; determining a projected electrical consumption of the wireless charging system based on the measured voltage; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; The wireless charging system is configured to: [Claim 2] The wireless charging device, a transmitting coil for transmitting power to the wirelessly rechargeable battery; a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil; 2. The wireless charging system of claim 1, wherein the first controller is configured to determine the actual electrical consumption of the wireless charging system by measuring an electrical characteristic of the power delivery signal. [Claim 3] The wireless rechargeable battery, a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device; a voltage rectifier coupled to the receiving coil and configured to receive a first voltage from the receiving coil and generate a second voltage from the first voltage; a voltage regulator coupled to the voltage rectifier and configured to receive the second voltage from the voltage rectifier and generate a third voltage from the second voltage; one or more battery cells configured to receive the third voltage from the voltage regulator; 3. The wireless charging system of claim 1 or 2, wherein the measured induced voltage in the wirelessly rechargeable battery is the second voltage. [Claim 4] The wireless rechargeable battery, a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device; one or more battery cells; an electrical load; 5. The wireless charging system of claim 1, wherein the second controller is configured to switch the wirelessly rechargeable battery between a charging configuration in which the receiving coil is connected to the one or more battery cells to charge the one or more battery cells and is decoupled from the electrical load, and a foreign object detection configuration in which the receiving coil is connected to the electrical load to supply power to the electrical load and is decoupled from the one or more battery cells. [Claim 5] 5. The wireless charging system of claim 4, wherein the electrical load comprises at least one resistor sized to dissipate an amount of power substantially equal to a maximum power delivered to the one or more battery cells in the charging configuration. [Claim 6] 6. The wireless charging system of claim 5, wherein the at least one resistor has a combined resistance of 8.3 ohms. [Claim 7] The second controller: determining a predicted electrical loss of the wirelessly rechargeable battery as a first electrical characteristic based on the measured voltage; determining an electrical characteristic of a signal provided to the electrical load as a second electrical characteristic when the wirelessly rechargeable battery is in the foreign object detection configuration; The device is configured to: 7. The wireless charging system of claim 4, wherein the predicted electrical consumption of the wireless charging system is determined based on the first and second electrical characteristics. [Claim 8] the wirelessly rechargeable battery comprising a non-volatile storage device that stores calibration data specific to the wirelessly rechargeable battery; 8. The wireless charging system of claim 7, wherein the second controller is configured to determine the first electrical characteristic based on the measured voltage and the calibration data. [Claim 9] the calibration data indicates a change in predicted electrical loss of the wirelessly rechargeable battery corresponding to a change in position of the wirelessly rechargeable battery relative to a wireless charging device, each of the predicted electrical losses being associated with a different voltage within the calibration data; 9. The wireless charging system of claim 8, wherein the second controller is configured to determine the first electrical characteristic based on the measured voltage and the calibration data by determining one of the predicted electrical losses indicated in the calibration data associated with the measured voltage in the calibration data. [Claim 10] The wireless charging device, a transmitting coil for transmitting power to the wirelessly rechargeable battery; a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil; The first controller: measuring an electrical characteristic of the power supply signal; Setting the electrical characteristic of the power delivery signal as the actual electrical consumption of the wireless charging system; determining a predicted electrical loss of the wireless charging device as a third electrical characteristic; The device is configured to: 10. The wireless charging system of claim 7, wherein the predicted electrical consumption of the wireless charging system is further determined based on the third electrical characteristic. [Claim 11] the wireless charging device comprises a first communication device, and the wirelessly rechargeable battery comprises a second communication device for communicating with the first communication device when the wirelessly rechargeable battery is in proximity to the wireless charging device; The second controller: receiving, via the first and second communication devices, the third electrical characteristic from the wireless charging device and the actual electrical consumption of the wireless charging system; determining the predicted electrical consumption of the wireless charging system based on the first, second, and third electrical characteristics; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; 11. The wireless charging system of claim 10, configured to: [Claim 12] the wireless charging device comprises a first communication device, and the wirelessly rechargeable battery comprises a second communication device for communicating with the first communication device when the wirelessly rechargeable battery is in proximity to the wireless charging device; The first controller: receiving, via the first and second communication devices, data from the wirelessly rechargeable battery indicative of the first and second electrical characteristics; determining the predicted electrical consumption of the wireless charging system based on the received data and a third electrical characteristic; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; 11. The wireless charging system of claim 10, configured to: [Claim 13] The wireless charging device, a transmitting coil for transmitting power to the wirelessly rechargeable battery; a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil; The first controller: measuring an electrical characteristic of the power supply signal; determining an electrical loss of the wireless charging device as a third electrical characteristic; and determining the actual electrical consumption of the wireless charging system based on the electrical characteristic of the power delivery signal and the third electrical characteristic; 10. The wireless charging system of claim 7, configured to determine the actual electrical consumption of the wireless charging system by: [Claim 14] the wireless charging device comprises a first communication device, and the wirelessly rechargeable battery comprises a second communication device for communicating with the first communication device when the wirelessly rechargeable battery is in proximity to the wireless charging device; The second controller: receiving the actual electricity consumption of the wireless charging system from the wireless charging device through the first and second communication devices; determining the predicted electrical consumption of the wireless charging system based on the first and second electrical characteristics; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; 14. The wireless charging system of claim 13, configured to: [Claim 15] the wireless charging device comprises a first communication device, and the wirelessly rechargeable battery comprises a second communication device for communicating with the first communication device when the wirelessly rechargeable battery is in proximity to the wireless charging device; The first controller: receiving, via the first and second communication devices, data from the wirelessly rechargeable battery indicative of the first and second electrical characteristics; determining the predicted electrical consumption of the wireless charging system based on the received data; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; 14. The wireless charging system of claim 13, configured to: [Claim 16] the wireless charging device comprising a non-volatile storage device configured to store calibration data indicative of the electrical losses of the wireless charging device; 16. The wireless charging system of claim 10, wherein the first controller is configured to determine the electrical losses of the wireless charging device by reading the calibration data from the non-volatile storage device. [Claim 17] The first controller or the second controller, determining whether a difference between the actual electricity consumption and the predicted electricity consumption is greater than or equal to a predetermined threshold; in response to determining that the difference is greater than or equal to the predetermined threshold, determining that a foreign object is in proximity to the wireless charging system; 17. The wireless charging system of claim 1, configured to: [Claim 18] The first controller or the second controller, triggering a charging cycle in response to determining that a foreign object is not proximate to the wireless charging device; Disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device. 18. The wireless charging system of claim 1 , configured to: [Claim 19] in response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device, the first and second controllers are configured to perform foreign object detection cycles interspersed with charging cycles; In each of the foreign object detection cycles, the first or second controller: determining whether a foreign object is proximate to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; triggering one of the charging cycles in response to determining that a foreign object is not proximate to the wireless charging device; Disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device. 19. The wireless charging system of claim 1 , configured to: [Claim 20] 20. The wireless charging system of claim 19, wherein the first or second controller is configured to trigger each of the foreign object detection cycles in response to detection of at least one of one or more predetermined events. [Claim 21] 21. The wireless charging system of claim 20, wherein the one or more predetermined events include the wirelessly rechargeable battery being placed in proximity to the wireless charging device. [Claim 22] 22. The wireless charging system of claim 20 or 21, wherein the one or more predetermined events include the passage of a predetermined time since a last foreign object detection cycle. [Claim 23] 22. The wireless charging system of claim 20, wherein the one or more predetermined events include a predetermined increase in power supplied by the wireless charging device since a last foreign object detection cycle. [Claim 24] 24. The wireless charging system of claim 1, wherein the predicted electrical consumption is a predicted electrical consumption of the wireless charging system, and the actual electrical consumption is an actual electrical consumption of the wireless charging system. [Claim 25] 24. The wireless charging system of claim 1, wherein the predicted electrical consumption is a current through the wireless charging system that corresponds to a predicted power consumption of the wireless charging system, and the actual electrical consumption is a current through the wireless charging system that corresponds to an actual power consumption of the wireless charging system. [Claim 26] 16. The wireless charging system of claim 2, wherein the electrical characteristic of the power supply signal is a power of the power supply signal. [Claim 27] 16. The wireless charging system of claim 2, wherein the electrical characteristic of the power supply signal is a current of the power supply signal. [Claim 28] 17. The wireless charging system of claim 10, wherein the first electrical characteristic is a predicted power loss of the wirelessly rechargeable battery, the second electrical characteristic is a power dissipated by the electrical load, and the third electrical characteristic is a predicted power loss of the wireless charging device. [Claim 29] 17. The wireless charging system of claim 10, wherein the first electrical characteristic is a current corresponding to an expected power loss of the wirelessly rechargeable battery, the second electrical characteristic is a current through the electrical load, and the third electrical characteristic is a current corresponding to an expected power loss of the wireless charging device. [Claim 30] A wirelessly rechargeable battery for detecting a foreign object in proximity to a wireless charging system, the wirelessly rechargeable battery including: a wireless charging device that transmits power to the wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the wireless charging device; Measuring an induced voltage in the wirelessly rechargeable battery by the wireless charging device; determining a projected electrical consumption of the wireless charging system based on the measured voltage; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption of the wireless charging system; A wireless rechargeable battery comprising: a controller configured to: [Claim 31] a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device; a voltage rectifier coupled to the receiving coil and configured to receive a first voltage from the receiving coil and generate a second voltage from the first voltage; a voltage regulator coupled to the voltage rectifier and configured to receive the second voltage from the voltage rectifier and generate a third voltage from the second voltage; one or more battery cells configured to receive the third voltage from the voltage regulator; Further equipped with 31. The wirelessly rechargeable battery of claim 30, wherein the measured induced voltage within the wirelessly rechargeable battery is the second voltage. [Claim 32] a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device; one or more battery cells; and an electrical load. 32. The wirelessly rechargeable battery of claim 30 or 31, wherein the controller is configured to switch the wirelessly rechargeable battery between a charging configuration in which the receiving coil is connected to the one or more battery cells to charge the one or more battery cells and is decoupled from the electrical load, and a foreign object detection configuration in which the receiving coil is connected to the electrical load to power the electrical load and is decoupled from the one or more battery cells. [Claim 33] 33. The wirelessly rechargeable battery of claim 32, wherein the electrical load comprises at least one resistor sized to dissipate an amount of power substantially equal to a maximum power delivered to the one or more battery cells in the charging configuration. [Claim 34] 34. The wirelessly rechargeable battery of claim 33, wherein the at least one resistor has a combined resistance of 8.3 ohms. [Claim 35] the wirelessly rechargeable battery comprises a first communication device for communicating with a second communication device of the wireless charging device when the wirelessly rechargeable battery is in proximity to the wireless charging device; The controller: determining a predicted electrical loss of the wirelessly rechargeable battery as a first electrical characteristic based on the measured voltage; determining an electrical characteristic of a signal provided to the electrical load as a second electrical characteristic when the wirelessly rechargeable battery is in the foreign object detection configuration; determining the predicted electrical consumption of the wireless charging system based on the first and second electrical characteristics; 35. The wirelessly rechargeable battery of any one of claims 32 to 34, configured to: [Claim 36] a non-volatile storage device that stores calibration data specific to the wirelessly rechargeable battery; 36. The wirelessly rechargeable battery of claim 35, wherein the controller is configured to determine the second electrical characteristic based on the measured voltage and the calibration data. [Claim 37] the calibration data indicates a change in predicted electrical loss of the wirelessly rechargeable battery corresponding to a change in position of the wirelessly rechargeable battery relative to a wireless charging device, each of the predicted electrical losses being associated with a different voltage within the calibration data; 37. The wirelessly rechargeable battery of claim 36, wherein the controller is configured to determine the second electrical characteristic based on the measured voltage and the calibration data by determining one of the predicted electrical losses indicated in the calibration data associated with the measured voltage in the calibration data. [Claim 38] The controller: receiving, via the first and second communication devices, a predicted electrical loss of the wireless charging device as a third electrical characteristic; the actual electrical consumption being a measured electrical characteristic of a power delivery signal provided by the wireless charging device; and receiving the actual electrical consumption of the wireless charging system through the first and second communication devices.

[0023] The method according to claim 1, further comprising: 38. The wirelessly rechargeable battery of claim 35, wherein the determination of the projected electrical consumption of the wireless charging system is further based on the third electrical characteristic. [Claim 39] the controller is further configured to receive the actual electrical consumption of the wireless charging system through the first and second communication devices; 38. The wirelessly rechargeable battery of claim 35, wherein the actual electrical consumption is based on a measured electrical characteristic of a power supply signal provided by the wireless charging device and a third electrical characteristic, the third electrical characteristic being a predicted electrical loss of the wireless charging device. [Claim 40] The controller: determining whether a difference between the actual electricity consumption and the actual electricity consumption is greater than or equal to a predetermined threshold; in response to determining that the difference is greater than or equal to the predetermined threshold, determining that a foreign object is in proximity to the wireless charging device; 40. The wirelessly rechargeable battery of any one of claims 30 to 39, configured to: [Claim 41] The controller: triggering a charging cycle in response to determining that a foreign object is not proximate to the wireless charging device; Disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device. 41. The wirelessly rechargeable battery of any one of claims 30 to 40, configured to: [Claim 42] in response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device, the controller is configured to perform foreign object detection cycles interspersed with charging cycles; During each of the foreign object detection cycles, the controller: determining whether a foreign object is proximate to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; triggering one of the charging cycles in response to determining that a foreign object is not proximate to the wireless charging device; Disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device. 42. The wirelessly rechargeable battery of any one of claims 30 to 41, configured to: [Claim 43] 43. The wirelessly rechargeable battery of claim 42, wherein the controller is configured to trigger each of the foreign object detection cycles in response to detection of at least one of one or more predetermined events. [Claim 44] 44. The wirelessly rechargeable battery of claim 43, wherein the one or more predetermined events include the wirelessly rechargeable battery being placed in proximity to the wireless charging device. [Claim 45] 45. The wirelessly rechargeable battery of any one of claims 43 to 44, wherein the one or more predetermined events comprises the passage of a predetermined time since the last foreign object detection cycle. [Claim 46] 46. ​​The wirelessly rechargeable battery of claim 43, wherein the one or more predetermined events comprises a predetermined increase in power supplied by the wireless charging device since a last foreign object detection cycle. [Claim 47] 47. The wirelessly rechargeable battery of claim 30, wherein the predicted electrical consumption is a predicted power consumption of the wireless charging system, and the actual electrical consumption is an actual power consumption of the wireless charging system. [Claim 48] 47. The wirelessly rechargeable battery of claim 30, wherein the predicted electrical consumption is a current through the wireless charging system that corresponds to a predicted power consumption of the wireless charging system, and the actual electrical consumption is a current through the wireless charging system that corresponds to an actual power consumption of the wireless charging system. [Claim 49] 40. A wirelessly rechargeable battery as claimed in claim 38 or 39, wherein the electrical characteristic of the power supply signal is the power of the power supply signal. [Claim 50] 40. A wirelessly rechargeable battery as claimed in claim 38 or 39, wherein the electrical characteristic of the power supply signal is the current of the power supply signal. [Claim 51] 40. The wirelessly rechargeable battery of claim 38 or 39, wherein the first electrical characteristic is a predicted power loss of the wirelessly rechargeable battery, the second electrical characteristic is the power dissipated by the electrical load, and the third electrical characteristic is a predicted power loss of the wireless charging device. [Claim 52] 40. The wirelessly rechargeable battery of claim 38 or 39, wherein the first electrical characteristic is a current corresponding to an expected power loss of the wirelessly rechargeable battery, the second electrical characteristic is a current through the electrical load, and the third electrical characteristic is a current corresponding to an expected power loss of the wireless charging device. [Claim 53] 1. A method for detecting a foreign object in proximity to a wireless charging system including a wireless charging device and a wirelessly rechargeable battery that receives power from the wireless charging device when the wirelessly rechargeable battery is in proximity to the wireless charging device, comprising: determining, by the wireless charging device, an actual electrical consumption of the wireless charging system; measuring, by the wirelessly rechargeable battery, a voltage induced in the wirelessly rechargeable battery by the wireless charging device; determining a predicted electrical consumption of the wireless charging system based on the measured voltage by the wireless charging device, the wirelessly rechargeable battery, or a combination of the wireless charging device and the wirelessly rechargeable battery; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption by the wireless charging device, the wireless rechargeable battery, or a combination of the wireless charging device and the wireless rechargeable battery; A method comprising: [Claim 54] the wireless charging device comprises: a transmitting coil for transmitting power to the wirelessly rechargeable battery; and a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil; 54. The method of claim 53, wherein determining the actual electrical consumption of the wireless charging system comprises measuring an electrical characteristic of the power delivery signal. [Claim 55] the wirelessly rechargeable battery comprises a receiving coil, a voltage rectifier connected to the receiving coil, a voltage regulator connected to the voltage rectifier, and one or more battery cells; receiving power from the wireless charging device by the receiving coil when the receiving coil is in proximity to the wireless charging device; receiving a first voltage from the receive coil with the voltage rectifier; outputting a second voltage from the first voltage by the voltage rectifier; receiving, by the voltage regulator, the second voltage from the voltage rectifier; outputting a third voltage from the second voltage by the voltage regulator; receiving, by the one or more battery cells, the third voltage from the voltage regulator; Further comprising: 55. The method of claim 53 or 54, wherein measuring the induced voltage in the wirelessly rechargeable battery by the wireless charging device includes measuring the second voltage. [Claim 56] the wirelessly rechargeable battery comprising a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device, one or more battery cells, and an electrical load; 56. The method of any one of claims 53 to 55, further comprising switching the wirelessly rechargeable battery between a charging configuration in which the receive coil is connected to one or more battery cells to charge the one or more battery cells and is decoupled from the electrical load, and a foreign object detection configuration in which the receive coil is connected to an electrical load to power the electrical load and is decoupled from the one or more battery cells. [Claim 57] determining, by the wirelessly rechargeable battery, a predicted electrical loss of the wirelessly rechargeable battery as a first electrical characteristic based on the measured voltage; determining, when the wirelessly rechargeable battery is in the foreign object detection configuration, an electrical characteristic of a signal provided by the wirelessly rechargeable battery to the electrical load as a second electrical characteristic; determining the predicted electrical consumption of the wireless charging system based on the first and second electrical characteristics; 57. The method of claim 56, further comprising: [Claim 58] the wirelessly rechargeable battery comprising a non-volatile storage device that stores calibration data specific to the wirelessly rechargeable battery; 58. The method of claim 57, wherein determining the first electrical characteristic based on the measured voltage comprises determining the first electrical characteristic based on the measured voltage and the calibration data. [Claim 59] the calibration data indicates a change in predicted electrical loss of the wirelessly rechargeable battery corresponding to a change in position of the wirelessly rechargeable battery relative to a wireless charging device, each of the predicted electrical losses being associated with a different voltage within the calibration data; 58. The method of claim 57, wherein determining the first electrical characteristic based on the measured voltage and the calibration data includes determining one of the predicted electrical losses indicated in the calibration data associated with the measured voltage in the calibration data. [Claim 60] the wireless charging device comprises: a transmitting coil for transmitting power to the wirelessly rechargeable battery; and a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil; measuring, by the wireless charging device, an electrical characteristic of the power delivery signal; setting, by the wireless charging device, the electrical characteristic of the power delivery signal as the actual electrical consumption of the wireless charging system; determining, by the wireless charging device, a predicted electrical loss of the wireless charging device as a third electrical characteristic; Further comprising: 60. The method of claim 57, wherein determining the projected electrical consumption of the wireless charging system is further based on the third electrical characteristic. [Claim 61] the wireless charging device includes a first communication device and the wirelessly rechargeable battery includes a second communication device; receiving, by the wirelessly rechargeable battery, through the first and second communication devices from the wireless charging device, the third electrical characteristic and the actual electrical consumption of the wireless charging system; determining the predicted electrical consumption of the wireless charging system based on the first, second, and third electrical characteristics by the wirelessly rechargeable battery; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; 61. The method of claim 60, further comprising: [Claim 62] the wireless charging device includes a first communication device and the wirelessly rechargeable battery includes a second communication device; receiving, by the wireless charging device through the first and second communication devices, data from the wirelessly rechargeable battery indicative of the first and second electrical characteristics; determining the predicted electrical consumption of the wireless charging system based on the first, second, and third electrical characteristics; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; 61. The method of claim 60, further comprising: [Claim 63] the wireless charging device comprises: a transmitting coil for transmitting power to the wirelessly rechargeable battery; and a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil; Determining the actual electrical consumption of the wireless charging system measuring, by the wireless charging device, an electrical characteristic of the power delivery signal; determining, by the wireless charging device, an electrical loss of the wireless charging device as a third electrical characteristic; and determining, by the wireless charging device, the actual electrical consumption of the wireless charging system based on the electrical characteristic of the power delivery signal and the third electrical characteristic. [Claim 64] the wireless charging device includes a first communication device and the wirelessly rechargeable battery includes a second communication device; receiving, by the wirelessly rechargeable battery, the actual electrical consumption of the wireless charging system from the wireless charging device through the first and second communication devices; determining the predicted electrical consumption of the wireless charging system based on the first and second electrical characteristics by the wirelessly rechargeable battery; determining, by the wirelessly rechargeable battery, whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; 64. The method of claim 63, further comprising: [Claim 65] the wireless charging device includes a first communication device and the wirelessly rechargeable battery includes a second communication device; receiving, by the wireless charging device through the first and second communication devices, data from the wirelessly rechargeable battery indicative of the first and second electrical characteristics; determining, by the wireless charging device, the predicted electrical consumption of the wireless charging system based on the received data; determining whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; 64. The method of claim 63, further comprising: [Claim 66] the wireless charging device includes a non-volatile storage device that stores calibration data indicative of the electrical losses of the wireless charging device; 66. The method of any one of claims 60 to 65, wherein determining the electrical loss of the wireless charging device includes reading the calibration data from the non-volatile storage device. [Claim 67] determining whether a difference between the actual electricity consumption and the predicted electricity consumption is greater than or equal to a predetermined threshold; in response to determining that the difference is greater than or equal to the predetermined threshold, determining that a foreign object is in proximity to the wireless charging device; 67. The method of any one of claims 53 to 66, further comprising: [Claim 68] triggering a charging cycle in response to determining that a foreign object is not proximate to the wireless charging device; Disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device. 68. The method of any one of claims 53 to 67, further comprising: [Claim 69] performing foreign object detection cycles interspersed with charging cycles in response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device; Each of the foreign object detection cycles comprises: determining whether a foreign object is proximate to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; triggering one of the charging cycles in response to determining that a foreign object is not proximate to the wireless charging device; and disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device. [Claim 70] 70. The method of claim 69, further comprising triggering each of the foreign object detection cycles in response to detection of at least one of one or more predetermined events. [Claim 71] 71. The method of claim 69 or 70, further comprising triggering one of the foreign object detection cycles in response to detecting that the wirelessly rechargeable battery is placed in proximity to the wireless charging device. [Claim 72] 72. The method of any one of claims 69 to 71, further comprising triggering at least one of the foreign object detection cycles in response to detecting the passage of a predetermined time since the last foreign object detection cycle. [Claim 73] 73. The method of any one of claims 69 to 72, further comprising triggering at least one of the foreign object detection cycles in response to detecting a predetermined increase in power supplied by the wireless charging device since a last foreign object detection cycle. [Claim 74] 1. A method for detecting a foreign object in proximity to a wireless charging system including a wirelessly rechargeable battery and a wireless charging device that transmits power to the wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the wireless charging device, comprising: measuring, by the wirelessly rechargeable battery, a voltage induced in the wirelessly rechargeable battery by the wireless charging device; determining, by the wirelessly rechargeable battery, a projected electrical consumption of the wireless charging system based on the measured voltage; determining, by the wirelessly rechargeable battery, whether a foreign object is in proximity to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption of the wireless charging system; A method comprising: [Claim 75] the wirelessly rechargeable battery comprises a receiving coil, a voltage rectifier connected to the receiving coil, a voltage regulator connected to the voltage rectifier, and one or more battery cells; receiving power from the wireless charging device by the receiving coil when the receiving coil is in proximity to the wireless charging device; receiving a first voltage from the receive coil with the voltage rectifier; outputting a second voltage from the first voltage by the voltage rectifier; receiving, by the voltage regulator, the second voltage from the voltage rectifier; outputting a third voltage from the second voltage by the voltage regulator; receiving, by the one or more battery cells, the third voltage from the voltage regulator; Further comprising: 75. The method of claim 74, wherein measuring the induced voltage in the wirelessly rechargeable battery by the wireless charging device includes measuring the second voltage. [Claim 76] the wirelessly rechargeable battery comprising a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device, one or more battery cells, and an electrical load; 76. The method of claim 74 or 75, further comprising switching the wirelessly rechargeable battery between a charging configuration in which the receive coil is connected to one or more battery cells to charge the one or more battery cells and is decoupled from the electrical load, and a foreign object detection configuration in which the receive coil is connected to an electrical load to power the electrical load and is decoupled from the one or more battery cells. [Claim 77] the wirelessly rechargeable battery comprises a first communication device for communicating with a second communication device of the wireless charging device; determining, by the wirelessly rechargeable battery, a predicted electrical loss of the wirelessly rechargeable battery as a first electrical characteristic based on the measured voltage; determining, when the wirelessly rechargeable battery is in the foreign object detection configuration, an electrical characteristic of a signal provided by the wirelessly rechargeable battery to the electrical load as a second electrical characteristic; determining the predicted electrical consumption of the wireless charging system based on the first and second electrical characteristics by the wirelessly rechargeable battery; 77. The method of claim 76, further comprising: [Claim 78] the wirelessly rechargeable battery comprising a non-volatile storage device that stores calibration data specific to the wirelessly rechargeable battery; 78. The method of claim 77, wherein determining the first electrical characteristic based on the measured voltage comprises determining the first electrical characteristic based on the measured voltage and the calibration data. [Claim 79] the calibration data indicates a change in predicted electrical loss of the wirelessly rechargeable battery corresponding to a change in position of the wirelessly rechargeable battery relative to a wireless charging device, each of the predicted electrical losses being associated with a different voltage within the calibration data; 80. The method of claim 78, wherein determining the first electrical characteristic based on the measured voltage and the calibration data includes determining one of the predicted electrical losses indicated in the calibration data associated with the measured voltage in the calibration data. [Claim 80] receiving, by the wirelessly rechargeable battery through the first and second communication devices, a predicted electrical loss of the wireless charging device as a third electrical characteristic; receiving, by the wirelessly rechargeable battery, the actual electrical consumption of the wireless charging system through the first and second communication devices, the actual electrical consumption being a measured electrical characteristic of a power delivery signal provided by the wireless charging device; Further comprising: 80. The method of claim 77, wherein determining the projected electrical consumption of the wireless charging system is further based on the third electrical characteristic. [Claim 81] 80. The method of any one of claims 77 to 79, further comprising: an actual electrical consumption of the wireless charging system, the actual electrical consumption being based on a measured electrical characteristic of a power delivery signal provided by the wireless charging device through the first and second communication devices, and a third electrical characteristic being a predicted electrical loss of the wireless charging device. [Claim 82] determining whether a difference between the actual electricity consumption and the actual electricity consumption is greater than or equal to a predetermined threshold; in response to determining that the difference is greater than or equal to the predetermined threshold, determining that a foreign object is in proximity to the wireless charging system; 82. The method of any one of claims 74 to 81, further comprising: [Claim 83] triggering a charging cycle in response to determining that a foreign object is not proximate to the wireless charging device; Disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device. 83. The method of any one of claims 74 to 82, further comprising: [Claim 84] performing foreign object detection cycles interspersed with charging cycles in response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device; Each of the foreign object detection cycles comprises: determining whether a foreign object is proximate to the wireless charging system based on the predicted electrical consumption and the actual electrical consumption; triggering one of the charging cycles in response to determining that a foreign object is not proximate to the wireless charging device; 84. The method of any one of claims 74 to 83, comprising: in response to determining that a foreign object is in proximity to the wireless charging device, disabling charging of the wirelessly rechargeable battery. [Claim 85] 85. The method of claim 84, further comprising triggering each of the foreign object detection cycles in response to detection of at least one of one or more predetermined events. [Claim 86] 86. The method of claim 84 or 85, further comprising triggering one of the foreign object detection cycles in response to detecting that the wirelessly rechargeable battery is placed in proximity to the wireless charging device. [Claim 87] 87. The method of any one of claims 84 to 86, further comprising triggering at least one of the foreign object detection cycles in response to detecting the passage of a predetermined time since the last foreign object detection cycle. [Claim 88] 88. The method of any one of claims 84 to 87, further comprising triggering at least one of the foreign object detection cycles in response to detecting a predetermined increase in power supplied by the wireless charging device since a last foreign object detection cycle. [Claim 89] 1. A wireless charging system for detecting a foreign object, comprising: A wireless rechargeable battery, a wireless charging device including a transmitting coil for charging the wirelessly rechargeable battery when the wirelessly rechargeable battery is placed in proximity to the transmitting coil; in response to the wirelessly rechargeable battery being located at a first distance from the transmit coil of the wireless charging device, determining a first projected electrical consumption of the wireless charging system corresponding to the first distance; determining whether a foreign object is proximate to the wireless charging system based on the first predicted electrical consumption; in response to the wirelessly rechargeable battery being placed at a second distance from the transmitting coil of the wireless charging device, the second distance being different than the first distance; determining a second projected electrical consumption of the wireless charging system corresponding to the second distance; determining whether a foreign object is in proximity to the wireless charging system based on the second predicted electrical consumption; At least one controller configured to A wireless charging system comprising: [Claim 90] 1. A method for detecting a foreign object in proximity to a wireless charging system including a wirelessly rechargeable battery and a wireless charging device having a transmitting coil for charging the wirelessly rechargeable battery when the wirelessly rechargeable battery is placed in proximity to the transmitting coil, comprising: in response to the wirelessly rechargeable battery being placed at a first distance from the transmit coil of the wireless charging device, determining a first projected electrical consumption of the wireless charging system corresponding to the first distance; determining whether a foreign object is proximate to the wireless charging system based on the first predicted electrical consumption; in response to the wirelessly rechargeable battery being placed at a second distance from the transmitting coil of the wireless charging device, the second distance being different than the first distance; determining a second projected electrical consumption of the wireless charging system corresponding to the second distance; determining whether a foreign object is in proximity to the wireless charging system based on the second predicted electrical consumption; A method comprising: [Claim 91] A method for calibrating a wirelessly rechargeable battery to detect a foreign object in proximity to a wireless charging system including a wireless rechargeable battery and a wireless charging device, the wireless charging device including a transmitting coil, the wirelessly rechargeable battery including a receiving coil, an electrical load connected to the receiving coil, and a non-volatile storage device; The method comprises: placing the wirelessly rechargeable battery proximate to the wireless charging device such that the receive coil is located a first distance from the transmit coil; while the wirelessly rechargeable battery is placed in proximity to the wireless charging device such that the receiving coil is at a first distance from the transmitting coil; Measuring a first induced voltage in the wirelessly rechargeable battery by the wireless charging device; Measuring a first electrical characteristic of a signal supplied to the electrical load and a first electrical characteristic of a power supply signal provided by the wireless charging device; determining a first electrical loss of the wirelessly rechargeable battery based on the first electrical characteristic of the electrical load, the first electrical characteristic of the power delivery signal provided by the wireless charging device, and a predicted electrical loss of the wireless charging device; placing the wirelessly rechargeable battery proximate to the wireless charging device such that the receive coil is located at a second distance from the transmit coil that is different from the first distance; while the wirelessly rechargeable battery is placed in proximity to the wireless charging device such that the receiving coil is at a second distance from the transmitting coil; Measuring a second induced voltage in the wirelessly rechargeable battery by the wireless charging device; and Measuring a second electrical characteristic of a signal supplied to the electrical load and a second electrical characteristic of the power supply signal provided by the wireless charging device; determining a second electrical loss of the wirelessly rechargeable battery based on the second electrical characteristic of the electrical load, the second electrical characteristic of the power delivery signal provided by the wireless charging device, and the predicted electrical loss of the wireless charging device; generating calibration data for the wirelessly rechargeable battery based on the first electrical loss of the wirelessly rechargeable battery, the second electrical loss of the wirelessly rechargeable battery, the first measured voltage, and the second measured voltage; storing the calibration data in the non-volatile storage device of the wirelessly rechargeable battery; A method comprising: [Claim 92] 1. A wireless charging system for detecting a foreign object, comprising: A wireless charging device; a wirelessly rechargeable battery comprising one or more battery cells configured to be charged from received power from a wireless charging device when the wirelessly rechargeable battery is in proximity to the wireless charging device for charging the one or more battery cells; At least one controller and Equipped with The at least one controller: initiating a charging cycle in response to the wirelessly rechargeable battery being placed in proximity to the wireless charging device; monitoring an electrical characteristic of a power delivery signal provided by the wireless charging device during the charging cycle; triggering a foreign object detection cycle based on the monitored electrical characteristic; The wireless charging system is configured to: [Claim 93] 93. The wireless charging system of claim 92, wherein the electrical characteristic monitored is power provided by the power delivery signal. [Claim 94] 93. The wireless charging system of claim 92, wherein the monitored electrical characteristic is a current of the power delivery signal. [Claim 95] The at least one controller: comparing the monitored electrical characteristic to a predetermined threshold; triggering the foreign object detection cycle based on the comparison; and 95. The wireless charging system of claim 92, wherein the wireless charging system is configured to trigger the foreign object detection cycle based on the monitored electrical characteristic by: [Claim 96] The at least one controller: determining a difference between a current level of the electrical characteristic and a level of the electrical characteristic at the start of the charging cycle; determining whether the difference is greater than or equal to the predetermined threshold; triggering the foreign object detection cycle in response to determining that the difference is greater than or equal to the predetermined threshold. 96. The wireless charging system of claim 95, configured to: [Claim 97] 97. The wireless charging system of any one of claims 92-96, wherein the at least one controller is configured to perform a foreign object detection cycle prior to initiation of the charging cycle. [Claim 98] 1. A method for detecting a foreign object in the vicinity of a wireless charging system comprising: a wirelessly rechargeable battery having one or more battery cells; and a wireless charging device for charging the one or more battery cells of the wirelessly rechargeable battery, the method comprising: placing the wirelessly rechargeable battery in proximity to the wireless charging device; initiating a charging cycle; monitoring an electrical characteristic of a power delivery signal provided by the wireless charging device during the charging cycle; triggering a foreign object detection cycle based on the monitored electrical characteristic; A method comprising: [Claim 99] 100. The method of claim 98, wherein monitoring an electrical characteristic of a power signal provided to the one or more battery cells during the charging cycle comprises determining a power provided by the power signal during the charging cycle. [Claim 100] 100. The method of claim 98, wherein monitoring an electrical characteristic of a power signal provided to the one or more battery cells during the charging cycle comprises determining a current of the power signal during the charging cycle. [Claim 101] triggering the foreign object detection cycle based on the monitored electrical characteristic. comparing the electrical characteristic to a predetermined threshold; triggering the foreign object detection cycle based on the comparison; and 101. The method of any one of claims 98 to 100, comprising: [Claim 102] determining a difference between a current level of the electrical characteristic and an initial level of the electrical characteristic at the start of the charging cycle; determining whether the difference is greater than or equal to the predetermined threshold; triggering the foreign object detection cycle in response to the difference being equal to or greater than the predetermined threshold. 102. The method of claim 101, further comprising: [Claim 103] The foreign object detection cycle comprises: comparing an actual electrical consumption of the wireless charging system during the foreign object detection cycle with a predicted electrical consumption of the wireless charging system; determining whether a foreign object is proximate to the wireless charging system based on the comparison; 103. The method of any one of claims 98 to 102, comprising: [Claim 104] 104. The method of any one of claims 98 to 103, further comprising performing a foreign object detection cycle prior to initiation of the charging cycle.

Claims

1. 1. A wireless charging system for detecting a foreign object, comprising: a wireless charging device comprising a first controller configured to determine an actual electrical consumption of the wireless charging system; A wireless rechargeable battery, a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device; one or more battery cells; an electrical load, wherein the wirelessly rechargeable battery is in a charging configuration when the receiving coil is connected to one or more battery cells for charging the one or more battery cells and is disconnected from the electrical load, and the wirelessly rechargeable battery is in a foreign object detection configuration when the receiving coil is connected to the electrical load for providing power to the electrical load and is disconnected from the one or more battery cells; a second controller configured to measure an induced voltage in the wirelessly rechargeable battery by the wireless charging device and to switch the wirelessly rechargeable battery between the charging configuration and the foreign object detection configuration; Equipped with the first controller, the second controller, or a combination of the first and second controllers; in response to the wirelessly rechargeable battery being placed at a first distance from a transmit coil of the wireless charging device; determining a first predicted electrical consumption of the wireless charging system based on a voltage measured by the second controller when the wirelessly rechargeable battery is located at the first distance; determining whether a foreign object is proximate to the wireless charging system based on the first predicted electrical consumption and an actual electrical consumption determined by the first controller when the wirelessly rechargeable battery is located at the first distance; Do the following: in response to the wirelessly rechargeable battery being placed at a second distance from the transmitting coil of the wireless charging device, the second distance being different than the first distance; determining a second projected electrical consumption of the wireless charging system based on a voltage measured by the second controller when the wirelessly rechargeable battery is located at the second distance; determining whether a foreign object is proximate to the wireless charging system based on the second predicted electrical consumption and an actual electrical consumption determined by the first controller when the wirelessly rechargeable battery is located at the second distance; The wireless charging system is configured to:

2. The wireless charging device, a transmitting coil for transmitting power to the wirelessly rechargeable battery; a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil; 2. The wireless charging system of claim 1, wherein the first controller is configured to determine the actual electrical consumption of the wireless charging system by measuring an electrical characteristic of the power delivery signal.

3. The wireless rechargeable battery, a voltage rectifier coupled to the receiving coil and configured to receive a first voltage from the receiving coil and generate a second voltage from the first voltage; a voltage regulator coupled to the voltage rectifier and configured to receive the second voltage from the voltage rectifier and generate a third voltage from the second voltage; the one or more battery cells are configured to receive the third voltage from the voltage regulator; 3. The wireless charging system of claim 1, wherein the measured induced voltage in the wirelessly rechargeable battery is the second voltage.

4. 4. The wireless charging system of claim 1, wherein the electrical load comprises at least one resistor sized to dissipate an amount of power substantially equal to a maximum power delivered to the one or more battery cells in the charging configuration.

5. The second controller: determining a first electrical characteristic, based on a voltage measured when the wirelessly rechargeable battery is located at the first distance, a predicted electrical loss of the wirelessly rechargeable battery; determining an electrical characteristic of a signal provided to the electrical load as a second electrical characteristic when the wirelessly rechargeable battery is in the foreign object detection configuration and the wirelessly rechargeable battery is located at the first distance; The device is configured to: The wireless charging system of claim 1 , wherein the first projected electrical consumption of the wireless charging system is determined based on the first and second electrical characteristics.

6. the wirelessly rechargeable battery comprising a non-volatile storage device that stores calibration data specific to the wirelessly rechargeable battery; 6. The wireless charging system of claim 5, wherein the second controller is configured to determine the first electrical characteristic based on the voltage measured by the second controller when the wirelessly rechargeable battery is located at the first distance and the calibration data.

7. the calibration data indicates a change in predicted electrical loss of the wirelessly rechargeable battery corresponding to a change in position of the wirelessly rechargeable battery relative to a wireless charging device, each of the predicted electrical losses being associated with a different voltage within the calibration data; 7. The wireless charging system of claim 6, wherein the second controller is configured to determine the first electrical characteristic based on the voltage measured by the second controller when the wirelessly rechargeable battery is located at the first distance and the calibration data by determining one of the predicted electrical losses indicated in the calibration data associated with the voltage measured by the second controller when the wirelessly rechargeable battery is located at the first distance.

8. The wireless charging device, a transmitting coil for transmitting power to the wirelessly rechargeable battery; a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil; The first controller, measuring an electrical characteristic of the power supply signal; Setting the electrical characteristic of the power delivery signal as the actual electrical consumption of the wireless charging system; determining a third electrical characteristic, a predicted electrical loss of the wireless charging device when the wirelessly rechargeable battery is located at the first distance; The device is configured to: The wireless charging system of claim 5 , wherein the first projected electrical consumption of the wireless charging system is further determined based on the third electrical characteristic.

9. the wireless charging device comprises a first communication device, and the wirelessly rechargeable battery comprises a second communication device for communicating with the first communication device when the wirelessly rechargeable battery is in proximity to the wireless charging device; The second controller: receiving, from the wireless charging device through the first and second communication devices, the third electrical characteristic determined by the first controller when the wirelessly rechargeable battery is located at the first distance and the actual electrical consumption of the wireless charging system; determining the first projected electrical consumption of the wireless charging system based on the first, second, and third electrical characteristics; in response to the wirelessly rechargeable battery being located at the first distance, determining whether a foreign object is proximate to the wireless charging system based on the first predicted electrical consumption and the actual electrical consumption determined by the first controller when the wirelessly rechargeable battery is located at the first distance; The wireless charging system of claim 8 , configured to:

10. the wireless charging device comprises a first communication device, and the wirelessly rechargeable battery comprises a second communication device for communicating with the first communication device when the wirelessly rechargeable battery is in proximity to the wireless charging device; The first controller, receiving, via the first and second communication devices, data from the wirelessly rechargeable battery indicative of the first and second electrical characteristics; determining the first projected electrical consumption of the wireless charging system based on the received data indicative of the first and second electrical characteristics and the third electrical characteristic; determining whether a foreign object is proximate to the wireless charging system based on the first predicted electrical consumption and the actual electrical consumption determined by the first controller when the wirelessly rechargeable battery is located at the first distance; in response to the wirelessly rechargeable battery being located at the first distance, determining whether a foreign object is proximate to the wireless charging system based on the first predicted electrical consumption and the actual electrical consumption determined by the first controller when the wirelessly rechargeable battery is located at the first distance; The wireless charging system of claim 8 , configured to:

11. The wireless charging device, a transmitting coil for transmitting power to the wirelessly rechargeable battery; a power source connected to the transmitting coil and configured to generate a power supply signal for powering the transmitting coil; The first controller, measuring an electrical characteristic of the power delivery signal when the wirelessly rechargeable battery is located at the first distance; determining an electrical loss of the wireless charging device as a third electrical characteristic when the wirelessly rechargeable battery is located at the first distance; and determining the actual electrical consumption of the wireless charging system based on the electrical characteristic of the power delivery signal and the third electrical characteristic when the wirelessly rechargeable battery is located at the first distance; 8. The wireless charging system of claim 5, configured to determine the actual electrical consumption of the wireless charging system by:

12. the wireless charging device comprises a first communication device, and the wirelessly rechargeable battery comprises a second communication device for communicating with the first communication device when the wirelessly rechargeable battery is in proximity to the wireless charging device; The first controller, receiving, via the first and second communication devices, data from the wirelessly rechargeable battery indicative of the first and second electrical characteristics; determining the first projected electrical consumption of the wireless charging system based on the received data; in response to the wirelessly rechargeable battery being located at the first distance, determining whether a foreign object is proximate to the wireless charging system based on the first predicted electrical consumption and the actual electrical consumption determined by the first controller when the wirelessly rechargeable battery is located at the first distance; The wireless charging system of claim 11 , configured to:

13. the wireless charging device comprising a non-volatile storage device configured to store calibration data indicative of the electrical losses of the wireless charging device; 13. The wireless charging system of claim 8, wherein the first controller is configured to determine the predicted electrical loss of the wireless charging device by reading the calibration data from the non-volatile storage device.

14. The first controller or the second controller, determining whether a difference between the actual electrical consumption determined by the first controller when the wirelessly rechargeable battery is located at the first distance and the first predicted electrical consumption is greater than or equal to a predefined threshold; determining that a foreign object is proximate to the wireless charging system in response to the wirelessly rechargeable battery being located at the first distance and in response to determining that the difference is equal to or greater than the predetermined threshold; The wireless charging system of claim 1 , configured to:

15. The first controller or the second controller, triggering a charging cycle in response to determining that a foreign object is not proximate to the wireless charging device; Disabling charging of the wirelessly rechargeable battery in response to determining that a foreign object is in proximity to the wireless charging device. The wireless charging system of claim 1 , configured to:

16. A wirelessly rechargeable battery for detecting a foreign object in proximity to a wireless charging system, the wirelessly rechargeable battery including: a wireless charging device that transmits power to the wirelessly rechargeable battery when the wirelessly rechargeable battery is in proximity to the wireless charging device; a receiving coil for receiving power from the wireless charging device when the receiving coil is in proximity to the wireless charging device; one or more battery cells; an electrical load, wherein the wirelessly rechargeable battery is in a charging configuration when the receiving coil is connected to one or more battery cells for charging the one or more battery cells and is disconnected from the electrical load, and the wirelessly rechargeable battery is in a foreign object detection configuration when the receiving coil is connected to the electrical load for providing power to the electrical load and is disconnected from the one or more battery cells; A controller, in response to the wirelessly rechargeable battery being located at a first distance from the wireless charging device, Measuring an induced voltage in the wirelessly rechargeable battery by the wireless charging device; switching the wirelessly rechargeable battery between the charging configuration and the foreign object detection configuration; determining a first projected electrical consumption of the wireless charging system based on a voltage measured by the controller when the wirelessly rechargeable battery is located at the first distance; determining whether a foreign object is proximate to the wireless charging system based on the first predicted electrical consumption and an actual electrical consumption of the wireless charging system when the wirelessly rechargeable battery is located at the first distance; Do the following: in response to the wirelessly rechargeable battery being placed at a second distance from the wireless charging device different from the first distance; Measuring an induced voltage in the wirelessly rechargeable battery by the wireless charging device; switching the wirelessly rechargeable battery between the charging configuration and the foreign object detection configuration; determining a second projected electrical consumption of the wireless charging system based on a voltage measured by the controller when the wirelessly rechargeable battery is located at the second distance; determining whether a foreign object is proximate to the wireless charging system based on the second predicted electrical consumption and the actual electrical consumption when the wirelessly rechargeable battery is located at the second distance; a controller configured to A wireless rechargeable battery comprising:

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