Passive electronic device and charging control method thereof

Abstract

The invention relates to the technical field of wireless communication and wireless charging, and provides a passive electronic device and a charging control method thereof, and the method comprises the steps: periodically obtaining an energy power parameter sensed from an active electronic device at a current relative position; performing full-state working simulation on the equipment according to the energy power parameters so as to predict power supply output voltages of a power supply circuit of the equipment at different moments under the full-state working simulation; judging whether the output voltage of the power supply at different moments reaches a voltage threshold value or not; and according to the judgment result, an operation prompt for reminding a user to control the relative position is output in real time, so that the equipment obtains electric energy required for completing work. According to the embodiment of the invention, the method can achieve the quick and accurate alignment of the energy supply position for the passive electronic equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communication and wireless charging, and in particular to a passive electronic device and a charging control method thereof. Background Art

[0002] Active electronic devices can provide energy to passive electronic devices through wireless charging technology to drive the passive electronic devices to work. In the scenario where active electronic devices provide energy to passive electronic devices through wireless charging technology, in order to obtain the received power required for normal operation (the power of the energy signal collected from the active electronic device), it is generally necessary to manually adjust the relative positions of the two ends of the transmitter and receiver (i.e., the passive electronic device and the active electronic device) based on the user's experience and feeling until the passive electronic device is aligned to the power supply position and a perception prompt is given. For passive electronic devices with very low power consumption, due to the high fault tolerance, this method can be used to quickly align to the power supply position (i.e., the position that meets the received power required for the normal operation of the passive electronic device). However, when the power consumption of the passive electronic device is relatively high, it will become sensitive to the relative position of the two ends of the transmitter and receiver, and the fault tolerance rate is low. This method is not conducive to quickly aligning to the power supply position.

[0003] In addition, there are currently some passive electronic devices that can measure the received voltage (i.e., the voltage of the energy signal collected from the active electronic device) and provide real-time feedback to the user to generally guide the user to move the passive electronic device to a position with a strong received voltage. However, what determines whether a passive electronic device can work is the received power of the passive electronic device, not the received voltage. Changes in the received voltage may be accompanied by changes in the internal resistance of the power supply, which may cause the received power of the passive electronic device to become higher or lower, that is, the received voltage is not necessarily proportional to the received power. Therefore, the received voltage is only a factor in determining the received power and cannot be used to characterize the received power. Based on the position where the received voltage is aligned to a strong received voltage, it may not actually meet the received power required for the normal operation of the passive electronic device, which may cause the passive electronic device to malfunction. Summary of the invention

[0004] The purpose of the embodiments of this specification is to provide a passive electronic device and a charging control method thereof, so as to quickly and accurately align the power supply position of the passive electronic device.

[0005] To achieve the above-mentioned purpose, on the one hand, an embodiment of this specification provides a charging control method for a passive electronic device, which is applied to the passive electronic device side, and the method includes:

[0006] Periodically obtaining energy power parameters sensed from active electronic devices at current relative positions;

[0007] Performing full-state operation simulation on the device according to the energy power parameter to predict the power supply output voltage of the power supply circuit of the device at different times under the full-state operation simulation;

[0008] Determine whether the power supply output voltage at different times reaches the voltage threshold;

[0009] According to the judgment result, an operation prompt for reminding the user to control the relative position is output in real time so that the device can obtain the electric energy required to complete the work.

[0010] In the charging control method of some embodiments, the energy power parameter includes:

[0011] The open circuit voltage and internal resistance of the power supply circuit at the current relative position.

[0012] In the charging control method of some embodiments, the periodic acquisition of energy power parameters sensed from the active electronic device at the current relative position includes:

[0013] The following actions are performed at the arrival of each measurement cycle:

[0014] The first switch and the second switch in the power supply circuit are in an off state; the first switch is connected in series between the rectifier circuit and the power regulator of the power supply circuit; the second switch is connected in series between the two ends of the output end of the rectifier circuit;

[0015] Measuring a first output voltage of the rectifier circuit and equating it to an open-circuit voltage of the power supply circuit at the current relative position;

[0016] The first switch is in an open state and the second switch is in a closed state;

[0017] measuring a second output voltage of the rectifier circuit;

[0018] According to the formula Calculating an equivalent internal resistance of the rectifier circuit at the current relative position as a power supply internal resistance of the power supply circuit at the current relative position;

[0019] Among them, R s is the equivalent internal resistance of the rectifier circuit at the current relative position, U max is the first output voltage of the rectifier circuit, U s is the second output voltage of the rectifier circuit, R r is the load internal resistance of the power supply circuit at the current relative position.

[0020] In the charging control method of some embodiments, the full-state operation simulation of the device according to the energy power parameter includes:

[0021] Obtaining the power output voltage of the power supply circuit at the current moment, and using it as the power output voltage of the power supply circuit at the initial moment in the full-state working simulation;

[0022] According to the formula Calculating the power supply output current of the power supply circuit at the initial moment under the full-state working simulation;

[0023] According to the formula U s (t+Δt)=U max -I s (t)R s Calculating the power supply output voltage of the power supply circuit at the next moment under the full-state working simulation;

[0024] Iteratively calculate the power supply output voltage of the power supply circuit at different times in the full-state operation simulation according to the above formula;

[0025] Among them, I s (t) is the power supply output current of the power supply circuit at time t under the full-state working simulation, I p (t) is the input current of the power regulator of the power supply circuit at time t under the full-state working simulation, U l is the load voltage of the device under full-state working simulation, I l (t) is the load current of the device at time t in the full-state working simulation, U s (t) is the power supply output voltage of the power supply circuit at time t in the full-state working simulation, η(U s (t),I l (t)) is the power supply regulator of the power supply circuit at U s (t) and I l The corresponding conversion efficiency under (t), I c (t) is the charging current of the energy storage capacitor of the power supply circuit at time t under the full-state operation simulation, Δt is the time increment, U s (t-Δt) is the power supply output voltage of the power supply circuit at time t-Δt in the full-state working simulation, C is the capacitance of the energy storage capacitor of the power supply circuit, U s (t+Δt) is the power supply output voltage of the power supply circuit at time t+Δt in the full-state operation simulation, U max is the open circuit voltage of the power supply circuit at the current relative position, R s is the power supply internal resistance of the power supply circuit at the current relative position.

[0026] In the charging control method of some embodiments, the voltage threshold includes a minimum input voltage of a power regulator of the power supply circuit.

[0027] In the charging control method of some embodiments, the real-time output of an operation prompt for reminding a user to control the relative position according to the judgment result includes:

[0028] When the power supply output voltages at different times all reach the voltage threshold, the device or the active electronic device outputs in real time an operation prompt to remind the user to maintain the current relative position;

[0029] Otherwise, the device or the active electronic device outputs in real time an operation prompt to remind the user to adjust the current position.

[0030] In some embodiments of the charging control method, after determining whether the power supply output voltages at different times all reach the voltage threshold, the method further includes:

[0031] Calculate the proportional relationship between the electric energy obtained by the device at the current relative position and the electric energy required to complete the work;

[0032] Determine the energy percentage sensed by the device at the current relative position according to the proportional relationship;

[0033] The energy percentage is displayed in real time by the device or the active electronic device.

[0034] In the charging control method of some embodiments, determining the energy percentage of the device at the current relative position according to the proportional relationship includes:

[0035] When the electric energy obtained by the device at the current relative position does not exceed half of the electric energy required to complete the work, the energy percentage of the device at the current relative position is set to 0%;

[0036] When the electric energy obtained by the device at the current relative position is equal to the electric energy required to complete the work, the energy percentage of the device at the current relative position is 60%;

[0037] When the electric energy obtained by the device at the current relative position reaches twice the electric energy required to complete the work, the energy percentage of the device at the current relative position is 100%.

[0038] On the other hand, an embodiment of the present specification further provides a passive electronic device, including:

[0039] antenna;

[0040] an energy harvesting interface for sensing wireless energy from an active electronic device through the antenna at the current relative position;

[0041] A power supply circuit, used for converting the wireless energy into direct current power for use by the device;

[0042] A power parameter acquisition circuit, used for periodically acquiring energy power parameters of the DC electric energy;

[0043] The main controller is used to perform full-state operation simulation of the device according to the energy power parameters to predict the power supply output voltage of the power supply circuit of the device at different times under the full-state operation simulation; determine whether the power supply output voltage at different times reaches the voltage threshold; and output in real time according to the judgment result an operation prompt to remind the user to control the relative position so that the device can obtain the electrical energy required to complete the work.

[0044] In some embodiments of the passive electronic device, the energy power parameter includes:

[0045] The open circuit voltage and internal resistance of the power supply circuit at the current relative position.

[0046] In the passive electronic device of some embodiments, the periodic collection of the energy power parameter of the direct current electric energy includes:

[0047] The following actions are performed at the arrival of each measurement cycle:

[0048] The first switch and the second switch in the power supply circuit are in an off state; the first switch is connected in series between the rectifier circuit and the power regulator of the power supply circuit; the second switch is connected in series between the two ends of the output end of the rectifier circuit;

[0049] Measuring a first output voltage of the rectifier circuit and equating it to an open-circuit voltage of the power supply circuit at the current relative position;

[0050] The first switch is in an open state and the second switch is in a closed state;

[0051] measuring a second output voltage of the rectifier circuit;

[0052] According to the formula Calculating an equivalent internal resistance of the rectifier circuit at the current relative position as a power supply internal resistance of the power supply circuit at the current relative position;

[0053] Among them, R s is the equivalent internal resistance of the rectifier circuit at the current relative position, U max is the first output voltage of the rectifier circuit, U s is the second output voltage of the rectifier circuit, R r is the load internal resistance of the power supply circuit at the current relative position.

[0054] In the passive electronic device of some embodiments, the step of performing full-state operation simulation on the device according to the energy power parameter includes:

[0055] Obtaining the power output voltage of the power supply circuit at the current moment, and using it as the power output voltage of the power supply circuit at the initial moment in the full-state working simulation;

[0056] According to the formula Calculating the power supply output current of the power supply circuit at the initial moment under the full-state working simulation;

[0057] According to the formula U s (t+Δt)=U max -I s (t)R s Calculating the power supply output voltage of the power supply circuit at the next moment under the full-state working simulation;

[0058] Iteratively calculate the power supply output voltage of the power supply circuit at different times in the full-state operation simulation according to the above formula;

[0059] Among them, I s (t) is the power supply output current of the power supply circuit at time t under the full-state working simulation, I p (t) is the input current of the power regulator of the power supply circuit at time t under the full-state working simulation, U l is the load voltage of the device under full-state working simulation, I l (t) is the load current of the device at time t in the full-state working simulation, U s (t) is the power supply output voltage of the power supply circuit at time t in the full-state working simulation, η(U s (t),I l (t)) is the power supply regulator of the power supply circuit at U s (t) and I l The corresponding conversion efficiency under (t), I c (t) is the charging current of the energy storage capacitor of the power supply circuit at time t under the full-state operation simulation, Δt is the time increment, U s (t-Δt) is the power supply output voltage of the power supply circuit at time t-Δt in the full-state working simulation, C is the capacitance of the energy storage capacitor of the power supply circuit, U s (t+Δt) is the power supply output voltage of the power supply circuit at time t+Δt in the full-state operation simulation, U max is the open circuit voltage of the power supply circuit at the current relative position, R s is the power supply internal resistance of the power supply circuit at the current relative position.

[0060] In some embodiments of the passive electronic device, the voltage threshold comprises a minimum input voltage of a power regulator of the power supply circuit.

[0061] In the passive electronic device of some embodiments, the real-time output of an operation prompt for reminding a user to control the relative position according to the judgment result includes:

[0062] When the power supply output voltages at different times all reach the voltage threshold, the device or the active electronic device outputs in real time an operation prompt to remind the user to maintain the current relative position;

[0063] Otherwise, the device or the active electronic device outputs in real time an operation prompt to remind the user to adjust the current position.

[0064] In the passive electronic device of some embodiments, the power supply circuit includes:

[0065] A rectifier circuit, used for converting the wireless energy into direct current;

[0066] A first voltage stabilizing circuit, used for stabilizing the DC power and providing it to the main load of the device;

[0067] The second voltage stabilizing circuit is used for stabilizing the DC power and providing it to the main controller for main use.

[0068] In the passive electronic device of some embodiments, the power parameter acquisition circuit includes:

[0069] a first transistor, whose input end is connected to the output end of the rectifier circuit, whose output end is connected to the input end of the first voltage stabilizing circuit, and whose output control end is connected to the main controller; the first transistor is disconnected when measuring the open circuit voltage and internal resistance of the power supply of the power supply circuit;

[0070] a second triode, whose input end is connected to the output end of the rectifier circuit through a first pull-up resistor, whose output end is grounded, and whose output control end is connected to the main controller; the second triode is disconnected when measuring the open-circuit voltage of the power supply of the power supply circuit, and is closed when measuring the internal resistance of the power supply of the power supply circuit at the current relative position;

[0071] The first analog-to-digital converter has an input end connected to the output end of the rectifier circuit and an output end connected to the main controller; and is used to collect the open-circuit voltage and output voltage of the power supply circuit.

[0072] In the passive electronic device of some embodiments, the power supply circuit includes:

[0073] A rectifier circuit, used for converting the wireless energy into direct current;

[0074] The first voltage stabilizing circuit is used for stabilizing the DC power and providing it to the main controller and the main load of the device.

[0075] In the passive electronic device of some embodiments, the power parameter acquisition circuit includes:

[0076] a third transistor, whose input end is connected to the output end of the rectifier circuit through a second pull-up resistor, whose output end is grounded, and whose output control end is connected to the main controller; the third transistor is disconnected when measuring the open-circuit voltage of the power supply of the power supply circuit, and is closed when measuring the internal resistance of the power supply of the power supply circuit;

[0077] The second analog-to-digital converter has an input end connected to the output end of the rectifier circuit and an output end connected to the main controller; and is used to collect the open-circuit voltage and output voltage of the power supply circuit.

[0078] It can be seen from the technical solutions provided by the above embodiments of this specification that the embodiments of this specification can be based on the current power receiving data (i.e., energy power parameters) of the passive electronic device and the power consumption data of the passive electronic device that changes with the working state, and based on these data, predict whether the energy currently received by the passive electronic device can meet the working needs of the device, and prompt the user in real time; if it cannot be met, the real-time prompt is used to guide the user's operation; if it can be met, the passive electronic device can start working; because it adopts the received power consumption that changes with the working state (rather than the received voltage) to judge whether the energy currently received by the passive electronic device can meet the working needs of the device, and the simulation time is very short, the embodiments of this specification can more accurately and quickly align the power supply position of the passive electronic device, thereby improving the user's experience of using the passive electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. In the drawings:

[0080] Figure 1 A schematic diagram of an application scenario of charging control of a passive electronic device in some embodiments of this specification;

[0081] Figure 2 This is a schematic diagram of an application scenario of charging control of an NFC passive electronic device in some embodiments of this specification;

[0082] Figure 3 It is a structural block diagram of an NFC passive electronic paper display device in the prior art;

[0083] Figure 4 is an equivalent simplified diagram of a power supply circuit of a passive electronic device in some embodiments of this specification;

[0084] Figure 5 A circuit diagram for measuring the open-circuit voltage and internal resistance of a power supply circuit of a passive electronic device in some embodiments of this specification;

[0085] Figure 6 This is a structural block diagram of an NFC passive electronic paper display device in some embodiments of this specification;

[0086] Figure 7 for Figure 6 The schematic diagram of the structure of the power parameter acquisition circuit in the NFC passive electronic paper display device shown;

[0087] Figure 8 This is a structural block diagram of an NFC passive electronic paper display device in some other embodiments of this specification;

[0088] Fig. 9 for Figure 8 The schematic diagram of the structure of the power parameter acquisition circuit in the NFC passive electronic paper display device shown;

[0089] Fig.10 is a flow chart of a charging control method for a passive electronic device in some embodiments of this specification;

[0090] Fig.11 This is a structural block diagram of a computer device in some embodiments of this specification.

[0091] [Description of Reference Numerals]

[0092] 10. Active electronic devices;

[0093] 20. Passive electronic devices;

[0094] 21. NFC reader / writer;

[0095] 22. NFC tag;

[0096] 23. Electromagnetic field;

[0097] 31. Passive electronic paper display device;

[0098] 32. Main controller;

[0099] 33. NFC antenna;

[0100] 34. Voltage stabilizing circuit;

[0101] 35. NFC energy collection interface;

[0102] 36. NFC communication interface;

[0103] 37. Electronic paper screen;

[0104] 38. Rectifier circuit;

[0105] 41. Voltage source;

[0106] 42. Internal resistance of power supply;

[0107] 43. DC converter;

[0108] 44. Energy storage capacitor;

[0109] 45. Load resistance;

[0110] 51. Voltage source;

[0111] 52. Internal resistance of power supply;

[0112] 53. Second switch;

[0113] 54. Load internal resistance;

[0114] 55. First switch;

[0115] 61. Passive electronic paper display device;

[0116] 62. Main controller;

[0117] 63. NFC antenna;

[0118] 64. A second voltage stabilizing circuit;

[0119] 65. NFC energy collection interface;

[0120] 66. NFC communication interface;

[0121] 67. Electronic paper screen;

[0122] 68. Rectifier circuit;

[0123] 69. Power parameter acquisition circuit;

[0124] 610, a first voltage stabilizing circuit;

[0125] 71. A first analog-to-digital converter;

[0126] 72. The second triode;

[0127] 73. The first triode;

[0128] 74. A first pull-up resistor;

[0129] 81. Passive electronic paper display device;

[0130] 82. Main controller;

[0131] 83. NFC antenna;

[0132] 84. A first voltage stabilizing circuit;

[0133] 85. NFC energy collection interface;

[0134] 86. NFC communication interface;

[0135] 87. Sensor;

[0136] 88. Rectifier circuit;

[0137] 89. Power parameter acquisition circuit;

[0138] 91. A second analog-to-digital converter;

[0139] 92. The third transistor;

[0140] 93. Second pull-up resistor;

[0141] 1102. Computer equipment;

[0142] 1104. Processor;

[0143] 1106. Memory;

[0144] 1108, driving mechanism;

[0145] 1110, input / output module;

[0146] 1112. Input device;

[0147] 1114. Output device;

[0148] 1116. Presentation equipment;

[0149] 1118. Graphical user interface;

[0150] 1120. Network interface;

[0151] 1122. Communication link;

[0152] 1124. Communication bus. DETAILED DESCRIPTION

[0153] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification. For example, in the following description, forming a second component above a first component may include an embodiment in which the first component and the second component are formed in direct contact, and may also include an embodiment in which the first component and the second component are formed in non-direct contact (that is, additional components may be included between the first component and the second component), etc.

[0154] Moreover, for ease of description, some embodiments of this specification may use spatially relative terms such as "above", "below", "top", "below", etc. to describe the relationship between one element or component and another (or other) elements or components as shown in the drawings of the embodiments. It should be understood that in addition to the orientations described in the drawings, the spatially relative terms are also intended to include different orientations of the device in use or operation. For example, if the device in the drawings is turned over, the elements or components described as "below" or "beneath" other elements or components will then be positioned "above" or "on" the other elements or components.

[0155] refer to Figure 1 As shown, in some embodiments of this specification, the active electronic device 10 can supply energy to the passive electronic device 20 in a wireless charging manner to drive the passive electronic device 20 to work. Among them, the active electronic device 10 can be an electronic device such as a smart phone, a smart wearable device, a tablet computer, a laptop computer, a passive electronic lock body, a card reader, etc.; wherein the smart wearable device can include a smart bracelet, a smart watch, smart glasses, a smart helmet, etc. The passive electronic device 20 can be a passive electronic paper display device, a passive electronic lock key, a passive card, a sensor, etc. In some embodiments of this specification, the active electronic device 10 can supply energy to the passive electronic device 20 in a unidirectional manner through wireless charging technologies such as Qi wireless charging, NFC wireless charging, or WLC wireless charging.

[0156] like Figure 2As shown, in some embodiments of this specification, taking the NFC wireless charging technology as an example, the active electronic device can be simplified to an NFC reader 21, and the passive electronic device can be simplified to an NFC tag 22. As an energy transmitting end, the NFC reader 21 can actively generate an electromagnetic field 23 outward. As an energy receiving end, the NFC tag 22 can receive energy from the electromagnetic field 23 generated by the NFC reader 21 to drive itself. In addition, with the help of the electromagnetic field 23, the NFC reader 21 can transfer energy to the NFC tag 22 in one direction (such as Figure 2 ), bidirectional data transmission can also be achieved between the NFC reader / writer 21 and the NFC tag 22 (as shown by the one-way arrow in Figure 2 (as indicated by the double-headed arrow in the figure).

[0157] refer to Figure 3 As shown, taking the NFC wireless charging technology as an example, the traditional passive electronic paper display device 31 may include a main controller 32, an NFC antenna 33, a voltage stabilizing circuit 34, an NFC energy collection interface 35, an NFC communication interface 36, an electronic paper screen 37 and a rectifier circuit 38. The passive electronic paper display device 31 can perform unidirectional energy transfer and NFC bidirectional data transmission with an external NFC reader through the NFC antenna 33. The NFC communication interface 36 and the NFC energy collection interface 35 are respectively connected to the NFC antenna 33. The NFC communication interface 36 is responsible for bidirectional data transmission with the external NFC reader. The NFC energy collection interface 35 is responsible for receiving the radio frequency energy sensed by the NFC antenna 33 and transmitting it to the rectifier circuit 38 to convert it into DC power. The DC power is transmitted to the voltage stabilizing circuit 34 for voltage stabilization to power the passive electronic paper display device 31. The NFC communication interface 36 is connected to the main controller 32, and the main controller 32 is responsible for controlling the various components of the passive electronic paper display device 31 and performing communication data processing. The main controller 32 is connected to the electronic paper screen 37, and uses the received data and energy to drive the electronic paper screen 37 to work (for example, refreshing the desired text and / or pattern on the electronic paper screen 37). Due to the characteristics of the electronic paper screen 37 itself, after the refresh is completed, even if the passive electronic paper display device 31 is no longer powered, the electronic paper screen 37 can still maintain the refreshed display content.

[0158] In the scenario where active electronic devices use NFC wireless charging technology to supply energy to passive electronic devices, since NFC technology uses magnetic induction technology to transfer energy, and magnetic induction is very sensitive to the relative position (distance, overlap, parallelism) of the antennas of the devices at both ends of the transmitter and receiver. Given the transceiver, whether the passive electronics can work properly will depend on the use of magnetic induction technology by NFC to communicate and transfer energy, and magnetic induction is very sensitive to the relative position (distance, overlap, parallelism) of the antennas of the devices at both ends of the transmitter and receiver. Given the transceiver, whether such passive electronic devices can work properly will depend on whether the user can align the antennas of the devices at both ends of the transmitter and receiver (i.e., align the power supply position).

[0159] At present, some passive electronic devices will prompt users to align the antennas at both ends of the transmitter and receiver when in use, such as prompts and instructions in mobile phone apps. However, this is not easy to operate in practice. Due to the diversity of transmitter devices (such as various models of mobile phones), their NFC antennas have different positions, sizes, and shapes, and there are no obvious markings. It is difficult to quickly achieve accurate alignment.

[0160] Some other passive electronic devices measure the received voltage and provide real-time feedback to the user to roughly guide the user to move the passive electronic device to a location with a strong signal. However, this method is generally problematic. First, it is the received power of the device, not the received voltage, that determines whether the device can work. The received voltage is only one factor that determines the received power and cannot represent the received power. Second, the power consumption of such devices often changes greatly with their own state. For example, the refresh power consumption of electronic paper has the complex characteristic of changing with time, and it takes a relatively long time and requires more energy. If the energy demand cannot be met at any time, it is easy to cause refresh failure. For the above reasons, the voltage indication has only some reference value at best and cannot be used as an indicator of whether the device can work properly. Such passive electronic devices cannot sense the level of energy supplied and the level of energy required, and cannot judge whether the energy supplied is higher than the energy required.

[0161] In summary, the normal operation of passive electronic devices currently relies on the user's experience and feeling to control the relative position of the two ends of the transmitter and receiver. This is not a big problem for passive electronic devices with very low power consumption because they have a higher fault tolerance. However, when the power consumption of passive electronic devices is high, they become more sensitive to the relative position of the two ends of the transmitter and receiver, and the fault tolerance is low. Their energy requirements are often not met, resulting in the inability of passive electronic devices to start or work abnormally.

[0162] In view of this, the embodiments of this specification provide a new passive electronic device and a charging control method thereof, so as to realize the quick and accurate alignment of the energy supply position for the passive electronic device. In the passive electronic device and the charging control scheme thereof in the embodiments of this specification, it is possible to predict whether the energy currently received by the passive electronic device can meet the working needs of the device based on the current power receiving data (i.e., energy power parameters) of the passive electronic device and the power consumption data of the passive electronic device that changes with the working state, and based on these data, to prompt the user in real time; if it cannot be met, the real-time prompt is used to guide the user's operation; if it can be met, the passive electronic device can start working.

[0163] In some embodiments of the present specification, a passive electronic device may include an antenna, an energy collection interface, a power supply circuit, a power parameter collection circuit, and a main controller. The antenna is used to sense wireless energy from an active electronic device at a current relative position; the energy collection interface is used to receive the wireless energy sensed by the antenna; the power supply circuit is used to convert the wireless energy into direct current power and provide it to the device (i.e., the passive electronic device) for use; the power parameter collection circuit is used to periodically collect the energy power parameters of the direct current power; the main controller is used to perform a full-state operation simulation on the device according to the energy power parameters to predict the power supply output voltage of the power supply circuit of the device at different times under the full-state operation simulation; determine whether the power supply output voltage at different times reaches the voltage threshold; and output an operation prompt in real time according to the judgment result to remind the user to control the relative position, so that the device can obtain the power required to complete the work. The energy power parameters may include: the open circuit voltage and internal resistance of the power supply circuit at the current relative position; the voltage threshold includes the minimum input voltage of the power regulator of the power supply circuit. Since the received power consumption that changes with the working state (rather than the received voltage) is used to determine whether the energy currently received by the passive electronic device can meet the working needs of the device, and the simulation time is very short, the embodiments of this specification can align the power supply position of the passive electronic device more accurately and quickly.

[0164] In order to accurately measure the energy and power parameters (i.e., open-circuit voltage and internal resistance of the power supply) of the power supply circuit of the passive electronic device at the current relative position, its power supply circuit can be simplified equivalently. Figure 4 As shown, in some embodiments of the present specification, the equivalent simplified power supply circuit of the passive electronic device may include a voltage source 41 and a power regulator; the voltage source 41 has a power supply internal resistance 42; the power regulator is composed of a DC converter (DC / DC) 43 and an energy storage capacitor 44; the voltage source 41 supplies power to a load resistor 45 after being stabilized by the power regulator. The voltage source 41 has a power supply open circuit voltage U max If the power supply internal resistance 42 (i.e. the equivalent internal resistance of the power supply) is R sIn actual scenarios, since the energy transmitter (i.e., active electronic device) and the energy receiver (passive electronic device) can be coupled via the coil antenna at a close distance, the antennas of the energy transmitter and the energy receiver actually constitute the primary and secondary of a transformer. max It is related to the input voltage, voltage conversion ratio, coupling degree, and rectification circuit efficiency of the transformer; R s It is related to the output impedance of the energy transmitter, the voltage conversion ratio of the transformer, the coupling degree, the transformer loss, and the efficiency of the rectifier circuit. As the relative position of the energy transmitter and the energy receiver changes, U max With R s Generally speaking, the farther the distance between the energy transmitter and the energy receiver, the worse the coupling degree. max The lower the R s The higher the max and R s When the voltage source 41 is fixed, the output current I s With output voltage U s Directly related.

[0165] The DC converter 43 is used to convert the voltage output by the power supply into a fixed voltage that can be used by the load. The DC converter 43 can be either a switch-mode voltage regulator (Switch-mode Voltage Regulator) or a linear regulator LDO (Low-dropout Voltage Regulator). In the embodiments of this specification, the most critical parameter of the power regulator is its conversion efficiency η c , η c Characterizes the ratio of the output power to the input power of the power regulator. For any DC converter 43, when the current output voltage is fixed, η c Generally determined by its input voltage and output current. The power regulator also has a minimum input voltage U low , when the input voltage is lower than this value, the power regulator will not be able to provide a stable voltage to the load.

[0166] The energy storage capacitor 44 is a temporary energy storage device, mainly used to pre-store energy to correspond to the instantaneous peak of load power. Since the power supply of passive electronic equipment is unstable, a larger energy storage capacitor 44 can be used to stabilize the power supply to the power regulator. The energy storage capacitor 44 has a greater impact on the circuit time domain dynamics and generally cannot be ignored.

[0167] The load resistor 45 is the load of the passive electronic device, which can use the power from the power regulator to work; if the resistance of the load resistor 45 is R1. Since the working voltage is constant, R1 can be converted into an easily measurable I l , which is the load current of the passive electronic device. Il Generally it is not constant, but changes with the working state of the device. For most passive electronic devices, since the working contents are generally the same under the working state, although I l will change, but after each power-on, its time-varying characteristics can basically be approximated as a fixed function. If the entire working length of the load is T, during each power-on process, I l In some embodiments of this specification, I l (t) Instruments with data sampling and storage functions can be used to measure and record the data of the current change over time during the operation of the equipment. For example, a digital multimeter with data recording function can be used to collect and record the current consumption of passive electronic equipment every millisecond during the full-state operation process. In addition, the I l (t) data.

[0168] According to the above analysis, the decisive links for the entire passive electronic device are: power supply output voltage U s (I s ), U s (I s ) is the output current I s (t) function; power regulator efficiency η(U s (t),I l (t)),η(U s (t),I l (t)) is a function of input voltage and output current; and the load current I s (t), I s (t) is a function of time.

[0169] If you want the entire passive electronic device to work stably, the load voltage U l Must remain stable, which requires the input voltage of the power regulator (that is, the power output voltage U s (I s )), must be higher than the minimum input voltage U of the power regulator at any time low That way, once the equipment starts working, it is guaranteed to get the job done.

[0170] In some embodiments of the present specification, whether the transmitting and receiving ends can work stably under the current relative position can be achieved through parameter measurement and time domain simulation calculation. After obtaining the necessary parameters through pre-measurement and real-time measurement, the prediction results can be calculated, that is, the power supply output voltage of the power supply circuit of the passive electronic device at different times under the full-state working simulation is predicted, and it is determined whether it is required. Since the simulation time is very short (several milliseconds, or even shorter), real-time measurement and real-time simulation can be repeated periodically to obtain the predicted value in the current situation in real time, and feedback is given to the user until the power supply output voltage of the power supply circuit at different times under the full-state working simulation meets the requirements.

[0171] Among them, full-state operation refers to the entire working process of a passive electronic device from power-on to the completion of its main load. For example, taking an NFC passive electronic paper display device as an example, its full-state operation refers to the entire working process from the power-on of the device to the completion of the screen refresh of the electronic paper screen.

[0172] Figure 5 , a circuit diagram for measuring the open circuit voltage and internal resistance of a power supply circuit of a passive electronic device in some embodiments of the present specification is shown in FIG. Figure 4 , Figure 5 The voltage source 51 has a resistance of R s A first switch 55 (ie Figure 5 The output terminals of the voltage source 51 are provided with a second switch 53 (i.e. Figure 5 Kr in) and load internal resistance 54 (i.e. Figure 5 Rr in.

[0173] Therefore, the power parameter acquisition circuit periodically acquires the energy power parameter of the DC electric energy, which may include: performing the following actions when each measurement cycle arrives:

[0174] (1) The first switch 55 and the second switch 53 in the power supply circuit are turned off;

[0175] (2) Measuring the first output voltage U of the rectifier circuit s At this time, since the voltage source 51 has no load and is in an open circuit state, the current U s Equivalent to the open circuit voltage U of the power supply circuit at the current relative position max ;

[0176] (3) The first switch 55 is in an open state and the second switch 53 is in a closed state;

[0177] (4) Measuring the second output voltage U of the rectifier circuit s ;

[0178] (5) calculating the equivalent internal resistance of the rectifier circuit at the current relative position according to the first output voltage and the second output voltage, as the power supply internal resistance of the power supply circuit at the current relative position, that is, according to the formula Calculate R s .

[0179] In some embodiments of this specification, the main controller performs full-state operation simulation on the device according to the energy power parameter, which may include:

[0180] (1) obtaining the power output voltage of the power supply circuit at the current moment, and using it as the power output voltage of the power supply circuit at the initial moment (i.e., moment t=0) in the full-state operation simulation;

[0181] (2) According to the formula Calculate the power supply output current I of the power supply circuit at the initial moment under the full-state working simulation s (t);

[0182] (3) According to the formula U s (t+Δt)=U max -I s (t)R s Calculating the power supply output voltage of the power supply circuit at the next moment under the full-state working simulation;

[0183] That is, through U max , R s and I s (t) Calculate U s (t), as the power supply output voltage U at the next moment t = t + Δt s (t+Δt);

[0184] (4) iteratively calculating the power supply output voltage of the power supply circuit at different times under full-state operation simulation according to the above formula;

[0185] Among them, I s (t) is the power supply output current of the power supply circuit at time t under full-state operation simulation;

[0186] I p (t) is the input current of the power regulator of the power supply circuit at time t under the full-state working simulation; since there is a capacitor between the power supply and the power regulator, and the capacitance is generally relatively large, the output voltage U s (t) The impact is significant, and the impact of capacitance needs to be considered;

[0187] U l is the load voltage of the device under full-state working simulation; U lGenerally a fixed value (i.e., the U l is a fixed value);

[0188] I l (t) is the load current of the device at time t in the full-state working simulation. The relationship curve of the current consumption of the load relative to time during operation can be pre-stored. For any current time t, there is a corresponding I l (t);

[0189] U s (t) is the power supply output voltage of the power supply circuit at time t under full-state operation simulation;

[0190] η(U s (t),I l (t)) is the power supply regulator of the power supply circuit at U s (t) and I l (t) corresponding conversion efficiency; η(U s (t),I l (t)) is the pre-stored data, and the efficiency of the power regulator under different input voltages and output currents can be obtained in advance by querying the data manual. Since the lookup table records discrete data values, other data in the interval between two adjacent recorded data can be obtained by linear interpolation calculation;

[0191] I c (t) is the charging current of the energy storage capacitor of the power supply circuit at time t under full-state operation simulation;

[0192] Δt is the time increment, U s (t-Δt) is the power supply output voltage of the power supply circuit at time t-Δt in the full-state operation simulation;

[0193] C is the capacitance of the energy storage capacitor of the power supply circuit;

[0194] U s (t+Δt) is the power supply output voltage of the power supply circuit at time t+Δt in the full-state operation simulation;

[0195] U max is the open circuit voltage of the power supply circuit at the current relative position;

[0196] R s is the power supply internal resistance of the power supply circuit at the current relative position.

[0197] After a round of simulation calculation is completed, it can be checked that within the entire full-state operation (i.e., T time), U s (t) whether they are all greater than U low Assuming that the working time of the device is T, the success criteria are: That is, at any time point from time 0 to time T, the power supply output voltage U s (t) should not be lower than the minimum input voltage U of the power regulator low .

[0198] Those skilled in the art can understand that the above-mentioned full-state operation simulation of passive electronic devices according to energy and power parameters is only an exemplary description. Since there are many technologies for time domain simulation of full-state operation of devices or electronic circuits according to energy and power parameters (or other parameters), in some other embodiments of the specification, these time domain simulation technologies can also be used according to actual needs. Therefore, the above-mentioned full-state operation simulation of passive electronic devices according to energy and power parameters is only an exemplary description and should not be understood as the only limitation to the embodiments of this specification.

[0199] In some embodiments of the present specification, the main controller outputs in real time based on the judgment result an operation prompt for reminding the user to control the relative position, which may include: when the power output voltage at different times reaches the voltage threshold, outputting in real time through the present device or the active electronic device an operation prompt to remind the user to maintain the current relative position; otherwise, outputting in real time through the present device or the active electronic device an operation prompt to remind the user to adjust the current position, that is, outputting in real time at the present device or the active electronic device an operation prompt to remind the user to adjust the current position.

[0200] In some embodiments of this specification, in order to facilitate the user to judge the distance and relative position of the two ends of the transmitter and receiver during use and give the user real-time feedback, the proportional relationship between the electric energy obtained by the device at the current relative position and the electric energy required to complete the work is calculated; the energy percentage sensed by the device at the current relative position is determined according to the proportional relationship; the energy percentage is displayed in real time by the device or the active electronic device. The user can judge the distance and relative position of the two ends of the transmitter and receiver by observing the rise and fall of the energy percentage.

[0201] In some embodiments of this specification, determining the energy percentage of the device at the current relative position according to the proportional relationship may include:

[0202] When the electric energy obtained by the device at the current relative position does not exceed half of the electric energy required to complete the work, the energy percentage of the device at the current relative position is set to 0%;

[0203] When the electric energy obtained by the device at the current relative position is equal to the electric energy required to complete the work, the energy percentage of the device at the current relative position is 60%;

[0204] When the electric energy obtained by the device at the current relative position reaches twice the electric energy required to complete the work, the energy percentage of the device at the current relative position is 100%.

[0205] Considering the limited energy of passive electronic devices, outputting operation prompts on the active electronic device side is the best choice; in some scenarios, if it is necessary to output operation prompts on the passive electronic device side, lower power consumption methods can be used, such as mechanical electromagnetic meter heads, liquid crystal displays, LED indicators, etc.

[0206] refer to Figure 6 As shown, in some embodiments of the present specification, taking the NFC wireless charging technology as an example, the passive electronic paper display device 61 may include a main controller 62, an NFC antenna 63, a second voltage stabilizing circuit 64, an NFC energy collection interface 65, an NFC communication interface 66, an electronic paper screen 67 (the electronic paper screen 67 here is an example of a main load), a rectifier circuit 68, a power parameter collection circuit 69 and a first voltage stabilizing circuit 610. Among them, the rectifier circuit 68, the second voltage stabilizing circuit 64 and the first voltage stabilizing circuit 610 form a power supply circuit for the passive electronic paper display device 61. The power parameter collection circuit 69 is arranged between the rectifier circuit 68 and the first voltage stabilizing circuit 610.

[0207] The passive electronic paper display device 61 can perform unidirectional energy transfer and NFC bidirectional data transmission with an external NFC reader / writer through the NFC antenna 63. The NFC communication interface 66 and the NFC energy collection interface 65 are respectively connected to the NFC antenna 63. The NFC communication interface 66 is responsible for bidirectional data transmission with the external NFC reader / writer. The NFC energy collection interface 65 is responsible for receiving the radio frequency energy sensed by the NFC antenna 63, and transmitting it to the rectifier circuit 68 to convert it into DC power, and the DC power is transmitted to the second voltage stabilizing circuit 64 and the first voltage stabilizing circuit 610 respectively; the first voltage stabilizing circuit 610 stabilizes the DC power and provides it to the electronic paper screen 67 for use; the second voltage stabilizing circuit 64 stabilizes the DC power and provides it to the main controller 62 for use. The NFC communication interface 66 is connected to the main controller 62, and the main controller 62 is responsible for controlling the various components of the passive electronic paper display device 61 and performing communication data processing. The main controller 62 is connected to the electronic paper screen 67, and uses the received data and energy to drive the electronic paper screen 67 to work (for example, refreshing the display of desired text and / or patterns on the electronic paper screen 67).

[0208] Combination Figure 7 As shown, Figure 6The power parameter acquisition circuit in the passive electronic paper display device 61 shown may include: a first analog-to-digital converter 71, a first transistor 73, a second transistor 72 and a first pull-up resistor 74. The first transistor 73 and the second transistor 72 may be implemented by MOSFET or the like.

[0209] The input end of the first analog-to-digital converter 71 is connected to the output end of the rectifier circuit, and the output end of the first analog-to-digital converter 71 is connected to the main controller; the first analog-to-digital converter 71 is used to collect the open-circuit voltage and output voltage of the power supply circuit.

[0210] The input end of the first transistor 73 is connected to the output end of the rectifier circuit, the output end of the first transistor 73 is connected to the input end of the first voltage stabilizing circuit, and the output control end of the first transistor 73 is connected to the main controller; under the control of the main controller, the first transistor 73 is disconnected when measuring the open-circuit voltage and internal resistance of the power supply circuit.

[0211] The input end of the second transistor 72 is connected to the output end of the rectifier circuit through the first pull-up resistor 74, the output end of the second transistor 72 is grounded, and the output control end of the second transistor 72 is connected to the main controller; under the control of the main controller, the second transistor 72 is disconnected when measuring the open-circuit voltage of the power supply of the power supply circuit, and the second transistor 72 is closed when measuring the internal resistance of the power supply circuit at the current relative position.

[0212] refer to Figure 8 As shown, in other embodiments of this specification, taking the NFC wireless charging technology as an example, the passive electronic paper display device 81 may include a main controller 82, an NFC antenna 83, a first voltage stabilizing circuit 84, an NFC energy collection interface 85, an NFC communication interface 86, a sensor 87 (the sensor 87 here is another example of a main load), a rectifier circuit 88 and a power parameter collection circuit 89. Among them, the first voltage stabilizing circuit 84 and the rectifier circuit 88 form a power supply circuit for the passive electronic paper display device 81. The power parameter collection circuit 89 is arranged between the rectifier circuit 88 and the first voltage stabilizing circuit 84.

[0213] The passive electronic paper display device 81 can perform unidirectional energy transfer and NFC bidirectional data transmission with an external NFC reader / writer through the NFC antenna 83. The NFC communication interface 86 and the NFC energy collection interface 85 are respectively connected to the NFC antenna 83. The NFC communication interface 86 is responsible for bidirectional data transmission with the external NFC reader / writer. The NFC energy collection interface 85 is responsible for receiving the radio frequency energy sensed by the NFC antenna 83, and transmitting it to the rectifier circuit 88 to convert it into DC power, which can be transmitted to the first voltage stabilizing circuit 84; the first voltage stabilizing circuit 84 stabilizes the DC power and provides it to the sensor 87 and the main controller 82 for use. The NFC communication interface 86 is connected to the main controller 82, and the main controller 82 is responsible for controlling the various components of the passive electronic paper display device 81 and performing communication data processing. The main controller 82 is connected to the sensor 87, and uses the received data and energy to control the sensor 87 to work.

[0214] Combination Fig. 9 As shown, Figure 8 The power parameter acquisition circuit in the passive electronic paper display device 81 shown may include: a second analog-to-digital converter 91, a third transistor 92 and a second pull-up resistor 93. The third transistor 92 may be implemented by MOSFET or the like.

[0215] The input end of the third transistor 92 is connected to the output end of the rectifier circuit through the second pull-up resistor 93, the output end of the third transistor 92 is grounded, and the output control end of the third transistor 92 is connected to the main controller; under the control of the main controller, the third transistor 92 is disconnected when measuring the open-circuit voltage of the power supply of the power supply circuit, and the third transistor 92 is closed when measuring the internal resistance of the power supply of the power supply circuit.

[0216] The input end of the second analog-to-digital converter 91 is connected to the output end of the rectifier circuit, and the output end of the second analog-to-digital converter 91 is connected to the main controller; the second analog-to-digital converter 91 can collect the open-circuit voltage and output voltage of the power supply circuit.

[0217] For the convenience of description, the passive electronic device described above is divided into various units according to their functions and described separately. Of course, when implementing this specification, the functions of each unit can be implemented in the same or multiple hardware and / or software.

[0218] The present specification also provides a charging control method for a passive electronic device, which can be applied to the above-mentioned passive electronic device side, referring to Fig.10 As shown, in some embodiments of this specification, a charging control method for a passive electronic device may include the following steps:

[0219] Step 101: periodically obtain energy power parameters sensed from an active electronic device at a current relative position.

[0220] Step 102: Perform full-state operation simulation on the device according to the energy power parameter to predict the power supply output voltage of the power supply circuit of the device at different times under the full-state operation simulation.

[0221] Step 103, determining whether the power supply output voltages at different times all reach the voltage threshold; if the power supply output voltages at different times all reach the voltage threshold, executing step 104; otherwise executing step 101.

[0222] Step 104: Outputting in real time, based on the judgment result, an operation prompt for reminding the user to control the relative position so that the device can obtain the power required to complete the work.

[0223] In the embodiments of the present specification, it is possible to predict whether the energy currently received by the passive electronic device can meet the working needs of the device based on the current power receiving data (i.e., energy power parameters) of the passive electronic device and the power consumption data of the passive electronic device that changes with the working state, and based on these data, to give a real-time prompt to the user; if it cannot be met, the real-time prompt is used to guide the user's operation; if it can be met, the passive electronic device can start working; because the received power consumption that changes with the working state is used to judge whether the energy currently received by the passive electronic device can meet the working needs of the device (rather than the received voltage), and the simulation time is very short, the embodiments of the present specification can more accurately and quickly align the power supply position of the passive electronic device, thereby improving the user's experience of using the passive electronic device.

[0224] In the charging control method of some embodiments of this specification, the energy power parameter includes:

[0225] The open circuit voltage and internal resistance of the power supply circuit at the current relative position.

[0226] In the charging control method of some embodiments of the present specification, the periodic acquisition of energy power parameters sensed from the active electronic device at the current relative position includes:

[0227] The following actions are performed at the arrival of each measurement cycle:

[0228] The first switch and the second switch in the power supply circuit are in an off state; the first switch is connected in series between the rectifier circuit and the power regulator of the power supply circuit; the second switch is connected in series between the two ends of the output end of the rectifier circuit;

[0229] Measuring a first output voltage of the rectifier circuit and equating it to an open-circuit voltage of the power supply circuit at the current relative position;

[0230] The first switch is in an open state and the second switch is in a closed state;

[0231] measuring a second output voltage of the rectifier circuit;

[0232] The equivalent internal resistance of the rectifier circuit at the current relative position is calculated according to the first output voltage and the second output voltage to serve as the power supply internal resistance of the power supply circuit at the current relative position.

[0233] In the charging control method of some embodiments of this specification, the full-state operation simulation of the device according to the energy power parameter includes:

[0234] Obtaining the power output voltage of the power supply circuit at the current moment, and using it as the power output voltage of the power supply circuit at the initial moment in the full-state working simulation;

[0235] According to the formula Calculating the power supply output current of the power supply circuit at the initial moment under the full-state working simulation;

[0236] According to the formula U s (t+Δt)=U max -I s (t)R s Calculating the power supply output voltage of the power supply circuit at the next moment under the full-state working simulation;

[0237] Iteratively calculate the power supply output voltage of the power supply circuit at different times in the full-state operation simulation according to the above formula;

[0238] Among them, I s (t) is the power supply output current of the power supply circuit at time t under the full-state working simulation, I p (t) is the input current of the power regulator of the power supply circuit at time t under the full-state working simulation, U l is the load voltage of the device under full-state working simulation, I l (t) is the load current of the device at time t in the full-state working simulation, U s (t) is the power supply output voltage of the power supply circuit at time t in the full-state working simulation, η(U s (t),I l (t)) is the power supply regulator of the power supply circuit at U s (t) and I l The corresponding conversion efficiency under (t), I c (t) is the charging current of the energy storage capacitor of the power supply circuit at time t under the full-state operation simulation, Δt is the time increment, Us (t-Δt) is the power supply output voltage of the power supply circuit at time t-Δt in the full-state working simulation, C is the capacitance of the energy storage capacitor of the power supply circuit, U s (t+Δt) is the power supply output voltage of the power supply circuit at time t+Δt in the full-state operation simulation, U max is the open circuit voltage of the power supply circuit at the current relative position, R s is the power supply internal resistance of the power supply circuit at the current relative position.

[0239] In the charging control method of some embodiments of the present specification, the voltage threshold includes a minimum input voltage of a power regulator of the power supply circuit.

[0240] In the charging control method of some embodiments of the present specification, the real-time output of an operation prompt for reminding the user to control the relative position according to the judgment result includes:

[0241] When the power supply output voltages at different times all reach the voltage threshold, the device or the active electronic device outputs in real time an operation prompt to remind the user to maintain the current relative position;

[0242] Otherwise, the device or the active electronic device outputs in real time an operation prompt to remind the user to adjust the current position.

[0243] In some embodiments of the present specification, after determining whether the power supply output voltages at different times all reach the voltage threshold, the charging control method further includes:

[0244] Calculate the proportional relationship between the electric energy obtained by the device at the current relative position and the electric energy required to complete the work;

[0245] Determine the energy percentage sensed by the device at the current relative position according to the proportional relationship;

[0246] The energy percentage is displayed in real time by the device or the active electronic device.

[0247] In the charging control method of some embodiments of the present specification, determining the energy percentage of the device at the current relative position according to the proportional relationship includes:

[0248] When the electric energy obtained by the device at the current relative position does not exceed half of the electric energy required to complete the work, the energy percentage of the device at the current relative position is set to 0%;

[0249] When the electric energy obtained by the device at the current relative position is equal to the electric energy required to complete the work, the energy percentage of the device at the current relative position is 60%;

[0250] When the electric energy obtained by the device at the current relative position reaches twice the electric energy required to complete the work, the energy percentage of the device at the current relative position is 100%.

[0251] Although the process flows described above include multiple operations that occur in a particular order, it should be clearly understood that the processes may include more or fewer operations, which may be performed sequentially or in parallel (eg, using parallel processors or a multi-threaded environment).

[0252] Although the process flows described above include multiple operations that occur in a particular order, it should be clearly understood that the processes may include more or fewer operations, which may be performed sequentially or in parallel (eg, using parallel processors or a multi-threaded environment).

[0253] In one embodiment of this invention, Fig.11 As shown, a computer device is also provided, and the computer device 1102 may include one or more processors 1104, such as one or more central processing units (CPUs) or graphics processing units (GPUs), and each processing unit may implement one or more hardware threads. The computer device 1102 may also include any memory 1106, which is used to store any kind of information such as code, settings, data, etc. In a specific embodiment, the computer program on the memory 1106 and can be run on the processor 1104, the computer program is to implement the method for establishing a learning engagement recognition network model described in any of the above or the learning engagement recognition method described in any of the above. Non-limiting, for example, the memory 1106 may include any one or more combinations of the following: any type of RAM, any type of ROM, flash memory device, hard disk, optical disk, etc. More generally, any memory can use any technology to store information. Further, any memory can provide volatile or non-volatile retention of information. Further, any memory can represent a fixed or removable component of the computer device 1102. In one embodiment, when the processor 1104 executes the associated instructions stored in any memory or combination of memories, the computer device 1102 can perform any operation of the associated instructions. The computer device 1102 also includes one or more drive mechanisms 1108 for interacting with any memory, such as a hard disk drive mechanism, an optical disk drive mechanism, etc.

[0254] The computer device 1102 may also include an input / output module 1110 (I / O) for receiving various inputs (via input devices 1112) and for providing various outputs (via output devices 1114). A specific output mechanism may include a presentation device 1116 and an associated graphical user interface (GUI) 1118. In other embodiments, the input / output module 1110 (I / O), the input device 1112, and the output device 1114 may not be included, and the computer device 1102 may be used as a computer device in a network. The computer device 1102 may also include one or more network interfaces 1120 for exchanging data with other devices via one or more communication links 1122. One or more communication buses 1124 couple the components described above together.

[0255] The communication link 1122 may be implemented in any manner, for example, through a local area network, a wide area network (e.g., the Internet), a point-to-point connection, etc., or any combination thereof. The communication link 1122 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc. governed by any protocol or combination of protocols.

[0256] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0257] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0258] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0259] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0260] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0261] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0262] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems or computer program products. Therefore, the embodiments of this specification may take the form of complete hardware embodiments, complete software embodiments or embodiments combining software and hardware. Moreover, the embodiments of this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0263] The present specification embodiments may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present specification embodiments may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0264] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the method embodiment, since it is basically similar to the device embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the device embodiment. In the description of this specification, the description of the reference term "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

[0265] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A charging control method for a passive electronic device, applied to the passive electronic device side, characterized in that: The method comprises: Periodically obtaining energy power parameters sensed from active electronic devices at current relative positions; Performing full-state operation simulation on the device according to the energy power parameter to predict the power supply output voltage of the power supply circuit of the device at different times under the full-state operation simulation; Determine whether the power supply output voltage at different times reaches the voltage threshold; According to the judgment result, an operation prompt for reminding the user to control the relative position is output in real time so that the device can obtain the electric energy required to complete the work.

2. The charging control method according to claim 1, characterized in that: The energy power parameters include: The open circuit voltage and internal resistance of the power supply circuit at the current relative position.

3. The charging control method according to claim 2, characterized in that: The periodically acquiring the energy power parameter sensed from the active electronic device at the current relative position includes: The following actions are performed at the arrival of each measurement cycle: The first switch and the second switch in the power supply circuit are in an off state; the first switch is connected in series between the rectifier circuit and the power regulator of the power supply circuit; the second switch is connected in series between the two ends of the output end of the rectifier circuit; Measuring a first output voltage of the rectifier circuit and equating it to an open-circuit voltage of the power supply circuit at the current relative position; The first switch is in an open state and the second switch is in a closed state; measuring a second output voltage of the rectifier circuit; According to the formula Calculating an equivalent internal resistance of the rectifier circuit at the current relative position as a power supply internal resistance of the power supply circuit at the current relative position; Among them, R s is the equivalent internal resistance of the rectifier circuit at the current relative position, U max is the first output voltage of the rectifier circuit, U s is the second output voltage of the rectifier circuit, R r is the load internal resistance of the power supply circuit at the current relative position.

4. The charging control method according to claim 2, characterized in that: The full-state operation simulation of the device according to the energy power parameter includes: Obtaining the power output voltage of the power supply circuit at the current moment, and using it as the power output voltage of the power supply circuit at the initial moment in the full-state working simulation; According to the formula Calculating the power supply output current of the power supply circuit at the initial moment under the full-state working simulation; According to the formula U s (t+Δt)=U max -I s (t)R s Calculating the power supply output voltage of the power supply circuit at the next moment under the full-state working simulation; Iteratively calculate the power supply output voltage of the power supply circuit at different times in the full-state operation simulation according to the above formula; Among them, I s (t) is the power supply output current of the power supply circuit at time t under the full-state working simulation, I p (t) is the input current of the power regulator of the power supply circuit at time t under the full-state working simulation, U l is the load voltage of the device under full-state working simulation, I l (t) is the load current of the device at time t in the full-state working simulation, U s (t) is the power supply output voltage of the power supply circuit at time t in the full-state working simulation, η(U s (t),I l (t)) is the power supply regulator of the power supply circuit at U s (t) and I l The corresponding conversion efficiency under (t), I c (t) is the charging current of the energy storage capacitor of the power supply circuit at time t under the full-state operation simulation, Δt is the time increment, U s (t-Δt) is the power supply output voltage of the power supply circuit at time t-Δt in the full-state working simulation, C is the capacitance of the energy storage capacitor of the power supply circuit, U s (t+Δt) is the power supply output voltage of the power supply circuit at time t+Δt in the full-state operation simulation, U max is the open circuit voltage of the power supply circuit at the current relative position, R s is the power supply internal resistance of the power supply circuit at the current relative position.

5. The charging control method according to claim 1, characterized in that: The voltage threshold comprises a minimum input voltage of a power regulator of the power supply circuit.

6. The charging control method according to claim 1, characterized in that: The real-time output of an operation prompt for reminding the user to control the relative position according to the judgment result includes: When the power supply output voltages at different times all reach the voltage threshold, the device or the active electronic device outputs in real time an operation prompt to remind the user to maintain the current relative position; Otherwise, the device or the active electronic device outputs in real time an operation prompt to remind the user to adjust the current position.

7. The charging control method according to claim 1, characterized in that: After determining whether the power supply output voltages at different times all reach the voltage threshold, the method further includes: Calculate the proportional relationship between the electric energy obtained by the device at the current relative position and the electric energy required to complete the work; Determine the energy percentage sensed by the device at the current relative position according to the proportional relationship; The energy percentage is displayed in real time by the device or the active electronic device.

8. The charging control method according to claim 7, characterized in that: Determining the energy percentage of the device at the current relative position according to the proportional relationship includes: When the electric energy obtained by the device at the current relative position does not exceed half of the electric energy required to complete the work, the energy percentage of the device at the current relative position is set to 0%; When the electric energy obtained by the device at the current relative position is equal to the electric energy required to complete the work, the energy percentage of the device at the current relative position is 60%; When the electric energy obtained by the device at the current relative position reaches twice the electric energy required to complete the work, the energy percentage of the device at the current relative position is 100%.

9. A passive electronic device, characterized in that: include: antenna; an energy harvesting interface for sensing wireless energy from an active electronic device through the antenna at the current relative position; A power supply circuit, used for converting the wireless energy into direct current power for use by the device; A power parameter acquisition circuit, used for periodically acquiring energy power parameters of the DC electric energy; The main controller is used to perform full-state operation simulation of the device according to the energy power parameters to predict the power supply output voltage of the power supply circuit of the device at different times under the full-state operation simulation; determine whether the power supply output voltage at different times reaches the voltage threshold; and output in real time according to the judgment result an operation prompt to remind the user to control the relative position so that the device can obtain the electrical energy required to complete the work.

10. The passive electronic device according to claim 8, characterized in that: The energy power parameters include: The open circuit voltage and internal resistance of the power supply circuit at the current relative position.

11. The passive electronic device according to claim 10, characterized in that: The periodic collection of energy and power parameters of the DC electric energy includes: The following actions are performed at the arrival of each measurement cycle: The first switch and the second switch in the power supply circuit are in an off state; the first switch is connected in series between the rectifier circuit and the power regulator of the power supply circuit; the second switch is connected in series between the two ends of the output end of the rectifier circuit; Measuring a first output voltage of the rectifier circuit and equating it to an open-circuit voltage of the power supply circuit at the current relative position; The first switch is in an open state and the second switch is in a closed state; measuring a second output voltage of the rectifier circuit; According to the formula Calculating an equivalent internal resistance of the rectifier circuit at the current relative position as a power supply internal resistance of the power supply circuit at the current relative position; Among them, R s is the equivalent internal resistance of the rectifier circuit at the current relative position, U max is the first output voltage of the rectifier circuit, U s is the second output voltage of the rectifier circuit, R r is the load internal resistance of the power supply circuit at the current relative position.

12. The passive electronic device according to claim 10, characterized in that: The full-state operation simulation of the device according to the energy power parameter includes: Obtaining the power output voltage of the power supply circuit at the current moment, and using it as the power output voltage of the power supply circuit at the initial moment in the full-state working simulation; According to the formula Calculating the power supply output current of the power supply circuit at the initial moment under the full-state working simulation; According to the formula U s (t+Δt)=U max -I s (t)R s Calculating the power supply output voltage of the power supply circuit at the next moment under the full-state working simulation; Iteratively calculate the power supply output voltage of the power supply circuit at different times in the full-state operation simulation according to the above formula; Among them, I s (t) is the power supply output current of the power supply circuit at time t under the full-state working simulation, I p (t) is the input current of the power regulator of the power supply circuit at time t under the full-state working simulation, U l is the load voltage of the device under full-state working simulation, I l (t) is the load current of the device at time t in the full-state working simulation, U s (t) is the power supply output voltage of the power supply circuit at time t in the full-state working simulation, η(U s (t),I l (t)) is the power supply regulator of the power supply circuit at U s (t) and I l The corresponding conversion efficiency under (t), I c (t) is the charging current of the energy storage capacitor of the power supply circuit at time t under the full-state operation simulation, Δt is the time increment, U s (t-Δt) is the power supply output voltage of the power supply circuit at time t-Δt in the full-state working simulation, C is the capacitance of the energy storage capacitor of the power supply circuit, U s (t+Δt) is the power supply output voltage of the power supply circuit at time t+Δt in the full-state operation simulation, U max is the open circuit voltage of the power supply circuit at the current relative position, R s is the power supply internal resistance of the power supply circuit at the current relative position.

13. The passive electronic device according to claim 9, characterized in that: The voltage threshold comprises a minimum input voltage of a power regulator of the power supply circuit.

14. The passive electronic device according to claim 9, characterized in that: The real-time output of an operation prompt for reminding the user to control the relative position according to the judgment result includes: When the power supply output voltages at different times all reach the voltage threshold, the device or the active electronic device outputs in real time an operation prompt to remind the user to maintain the current relative position; Otherwise, the device or the active electronic device outputs in real time an operation prompt to remind the user to adjust the current position.

15. The passive electronic device according to claim 12, characterized in that: The power supply circuit comprises: A rectifier circuit, used for converting the wireless energy into direct current; A first voltage stabilizing circuit, used for stabilizing the DC power and providing it to the main load of the device; The second voltage stabilizing circuit is used for stabilizing the DC power and providing it to the main controller for main use.

16. The passive electronic device according to claim 15, characterized in that: The power parameter acquisition circuit comprises: a first transistor, whose input end is connected to the output end of the rectifier circuit, whose output end is connected to the input end of the first voltage stabilizing circuit, and whose output control end is connected to the main controller; the first transistor is disconnected when measuring the open circuit voltage and internal resistance of the power supply of the power supply circuit; a second triode, whose input end is connected to the output end of the rectifier circuit through a first pull-up resistor, whose output end is grounded, and whose output control end is connected to the main controller; the second triode is disconnected when measuring the open-circuit voltage of the power supply of the power supply circuit, and is closed when measuring the internal resistance of the power supply of the power supply circuit at the current relative position; The first analog-to-digital converter has an input end connected to the output end of the rectifier circuit and an output end connected to the main controller; and is used to collect the open-circuit voltage and output voltage of the power supply circuit.

17. The passive electronic device according to claim 9, characterized in that: The power supply circuit comprises: A rectifier circuit, used for converting the wireless energy into direct current; The first voltage stabilizing circuit is used for stabilizing the DC power and providing it to the main controller and the main load of the device.

18. The passive electronic device according to claim 17, characterized in that: The power parameter acquisition circuit comprises: a third transistor, whose input end is connected to the output end of the rectifier circuit through a second pull-up resistor, whose output end is grounded, and whose output control end is connected to the main controller; the third transistor is disconnected when measuring the open-circuit voltage of the power supply of the power supply circuit, and is closed when measuring the internal resistance of the power supply of the power supply circuit; The second analog-to-digital converter has an input end connected to the output end of the rectifier circuit and an output end connected to the main controller; and is used to collect the open-circuit voltage and output voltage of the power supply circuit.

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