Wireless charging device, foreign matter detection method and system thereof and storage medium

Abstract

The invention relates to the technical field of wireless charging, and discloses a wireless charging device, a foreign matter detection method and system thereof and a storage medium, and the method comprises the steps: obtaining the real-time current of a transmitting coil and the real-time voltage of a receiving coil after detecting that charging equipment is placed on a charging base and enters a charging mode; drawing a real-time charging curve based on the real-time current and the real-time voltage; the real-time charging curve is compared with a standard charging curve, the foreign matter detection result of the wireless charging device is determined, and the standard charging curve is a corresponding charging curve when no foreign matter exists in the wireless charging device. The current of the transmitting coil is related to the induction distance between the transmitting coil and the receiving coil, the induction distance can be influenced when the foreign matter exists, the voltage of the receiving coil is not influenced, and the foreign matter is compared with a standard charging curve, namely a corresponding charging curve when the foreign matter does not exist. The foreign matter detection function of the wireless charging device is realized, the charging efficiency is improved, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to a wireless charging device and a foreign object detection method, system and storage medium thereof. Background Art

[0002] Among the current wireless charging technologies, magnetic induction coupling and resonant coupling are the most widely used. Both of these technical solutions are based on the principle of electromagnetic induction. The high-frequency alternating current of the transmitting coil generates a high-frequency magnetic field, and the energy is transferred from the transmitting coil to the receiving coil through the high-frequency magnetic field to achieve wireless charging. The usual wireless charging system consists of a power transmitter connected to the mains and a power receiver connected to the load. There is no electrical contact between the power transmitter and the power receiver, and wireless energy transmission is performed by electromagnetic induction.

[0003] There is an air gap between the transmitting coil of the power transmitting device and the receiving coil of the power receiving device of the wireless charging system, and various foreign objects may enter in the middle of the air gap. When there is a metal foreign object, due to the eddy current effect of the metal in the time-varying magnetic field, eddy currents will be generated in the metal, causing the metal to heat up, and there is a possibility of spontaneous combustion (such as tin foil will spontaneously combust when the temperature reaches a certain level) or burning other items (the heat of the metal causes the leaves and paper on it to burn), which will reduce the energy transmission efficiency of the wireless charging system. In order to ensure the safe operation and transmission efficiency of the system, foreign object detection must be performed.

[0004] In current wireless charging systems, the induction voltage method is often used for foreign object detection. The principle of the induction voltage method is to place the detection circuit in a high-frequency magnetic field, and determine whether the magnetic field is distorted by judging whether the induced voltage of the detection circuit is abnormal, and then determine whether there is a foreign object. The existing wireless charging detection method has insufficient detection accuracy and is prone to misjudgment. It mainly has a good detection effect on metal foreign objects, and the detection accuracy of non-metallic foreign objects is even more inaccurate. Summary of the invention

[0005] In view of this, the present invention provides a wireless charging device and a foreign object detection method, system and storage medium thereof to solve the problem that the foreign object detection method of the wireless charging device in the related art can only realize metal foreign object detection and has low detection accuracy.

[0006] In a first aspect, the present invention provides a foreign body detection method for a wireless charging device, wherein the wireless charging device comprises: a transmitting coil and a receiving coil, wherein the transmitting coil is installed in a charging base, and the receiving coil is installed in a charging device, and the method comprises:

[0007] After detecting that the charging device is placed on the charging base and enters the charging mode, obtaining the real-time current of the transmitting coil and the real-time voltage of the receiving coil;

[0008] Draw a real-time charging curve based on the real-time current and the real-time voltage;

[0009] The real-time charging curve is compared with a standard charging curve to determine a foreign object detection result of the wireless charging device, wherein the standard charging curve is a charging curve corresponding to when no foreign object exists in the wireless charging device.

[0010] The present invention obtains the current of the transmitting coil and the voltage of the receiving coil in the wireless charging device in real time to draw a real-time charging curve during the process of the wireless charging device charging the charging device. The current of the transmitting coil is related to the induction distance between the transmitting coil and the receiving coil. When a foreign object exists, the induction distance will be affected, but the voltage of the receiving coil will not be affected. Therefore, by comparing it with a standard charging curve, that is, a charging curve corresponding to the absence of a foreign object, the foreign object detection function of the wireless charging device is realized, and accurate foreign object detection can be achieved for both metal foreign objects and non-metal foreign objects, which is beneficial to improving the charging efficiency of the wireless charging device and improving the user experience.

[0011] In an optional implementation, the real-time charging curve and the standard charging curve both include: a charging voltage curve and a charging current curve, and comparing the real-time charging curve with the standard charging curve to determine the foreign object detection result of the wireless charging device includes:

[0012] Taking the charging voltage curve in the real-time charging curve as a reference, determining whether each charging current value on the charging current curve in the real-time charging curve at each charging voltage is within the upper and lower limit intervals of the charging current curve at the same charging voltage in the standard charging curve;

[0013] When each charging current value on the charging current curve in the real-time charging curve at each charging voltage is within the upper and lower limit range of the charging current curve at the same charging voltage in the standard charging curve, it is determined that the foreign object detection result of the wireless charging device is no foreign object.

[0014] The present invention uses the charging voltage curve in the real-time charging curve as a reference, and compares the corresponding charging current values ​​under various charging voltages. If the charging current value is within the upper and lower limit intervals of the standard charging curve, it is considered that the real-time charging curve conforms to the standard charging curve. At this time, there is no foreign matter between the transmitting coil and the receiving coil, thereby achieving accurate detection of no foreign matter and ensuring the accuracy of the detection result.

[0015] In an optional embodiment, the method further includes:

[0016] When each charging current value on the charging current curve in the real-time charging curve at each charging voltage is not within the upper and lower limit intervals of the charging current curve at the same charging voltage in the standard charging curve, it is determined that the foreign object detection result of the wireless charging device is that there is a foreign object.

[0017] The present invention uses the charging voltage curve in the real-time charging curve as a reference, and compares the corresponding charging current values ​​under various charging voltages. If the charging current value is not within the upper and lower limit intervals of the standard charging curve, it is considered that the real-time charging curve does not conform to the standard charging curve. At this time, there is a foreign object between the transmitting coil and the receiving coil, thereby achieving accurate detection of the foreign object and ensuring the accuracy of the detection result.

[0018] In an optional embodiment, the method further includes:

[0019] Based on the foreign object detection result of the wireless charging device, charging control and / or foreign object alarm are performed on the wireless charging device.

[0020] The present invention uses the foreign object detection result of the wireless charging device to control the charging of the wireless charging device and / or issue a foreign object alarm, thereby realizing automatic charging control of the wireless charging device, while ensuring the charging efficiency of the wireless charging device and further improving the user experience.

[0021] In an optional implementation, the charging control of the wireless charging device and / or the foreign object alarm based on the foreign object detection result of the wireless charging device includes:

[0022] When the foreign object detection result is that there is no foreign object, maintaining the charging mode in which the charging base charges the charging device;

[0023] When the foreign object detection result indicates that there is a foreign object, the charging base is stopped from charging the charging device and / or a foreign object alarm is issued.

[0024] The present invention ensures the charging efficiency of the charging device during the charging process and improves the user experience by charging the charging device normally when there is no foreign object. When there is a foreign object, the present invention stops charging and issues a foreign object alarm, promptly reminding the user to perform operations such as cleaning the foreign object, further ensuring the charging efficiency of the subsequent charging process and further improving the user experience.

[0025] In a second aspect, the present invention provides a foreign object detection system for a wireless charging device, wherein the wireless charging device comprises: a transmitting coil and a receiving coil, wherein the transmitting coil is installed in a charging base, and the receiving coil is installed in a charging device, and the system comprises:

[0026] An acquisition module, configured to acquire the real-time current of the transmitting coil and the real-time voltage of the receiving coil after detecting that the charging device is placed on the charging base and enters a charging mode;

[0027] A first processing module, configured to draw a real-time charging curve based on the real-time current and the real-time voltage;

[0028] The second processing module is used to compare the real-time charging curve with a standard charging curve to determine a foreign object detection result of the wireless charging device, wherein the standard charging curve is a charging curve corresponding to when there is no foreign object in the wireless charging device.

[0029] In a third aspect, the present invention provides a wireless charging device, comprising: a transmitting coil and a receiving coil, wherein the transmitting coil is installed in a charging base, and the receiving coil is installed in a charging device. The wireless charging device also comprises: a main control unit, wherein the main control unit comprises: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, wherein computer instructions are stored in the memory, and wherein the processor executes the method described in the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0030] In an optional implementation, surfaces of the transmitting coil and the receiving coil are respectively attached to contact areas of a shell of the charging base and a shell of the charging device, so as to minimize the distance between the transmitting coil and the receiving coil.

[0031] The present invention ensures that the distance between the transmitting coil and the receiving coil is minimized by attaching the surfaces of the transmitting coil and the receiving coil to the contact areas of the charging base shell and the charging device shell respectively, so as to maximize the charging efficiency of the wireless charging device and improve the user experience.

[0032] In an optional implementation, a wire passing groove is provided on the magnetic isolation plates of the transmitting coil and the receiving coil, and the inner leads of the transmitting coil and the receiving coil are led out from the bottom through the wire passing groove.

[0033] The present invention adopts a structural design in which a wire passing groove is provided on the magnetic isolation plates of the transmitting coil and the receiving coil, and the inner leads of the transmitting coil and the receiving coil are led out from the bottom through the wire passing groove, thereby further reducing the distance between the lead wires between the transmitting coil and the receiving coil, and further ensuring the charging efficiency of the wireless charging device.

[0034] In an optional embodiment, the wireless charging device also includes: a detection unit and an operation display unit connected to the main control unit, wherein the detection unit is used to sample and detect the real-time current of the transmitting coil and the real-time voltage of the receiving coil, and send the detection results to the main control unit; the operation display unit is used to display the current functional mode of the wireless charging device based on user operation, and to issue a foreign object alarm upon receiving a foreign object alarm control instruction from the main control unit.

[0035] The present invention realizes the current detection function of the transmitting coil and the voltage detection function of the receiving coil by setting the detection unit, and facilitates the user to perform function mode operation and abnormal alarm prompts by setting the operation display unit, thereby further improving the user experience.

[0036] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the method described in the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 is a flow chart of a foreign body detection method for a wireless charging device according to an embodiment of the present invention;

[0039] Figure 2 is a flow chart of another foreign body detection method for a wireless charging device according to an embodiment of the present invention;

[0040] Figure 3 It is a schematic diagram of the standard charging curve of a wireless charging device;

[0041] Figure 4 is a schematic diagram of the structure of a wireless charging device;

[0042] Figure 5A It is a schematic diagram of the back side of the transmitting coil in the wireless charging device;

[0043] Figure 5B It is a front view schematic diagram of a transmitting coil in a wireless charging device;

[0044] Figure 6 is another structural schematic diagram of a wireless charging device;

[0045] Figure 7 It is a working flow diagram of the wireless charging device;

[0046] Figure 8 is a structural block diagram of a foreign object detection system for a wireless charging device according to an embodiment of the present invention;

[0047] Fig. 9 is a structural schematic diagram of a main control unit of a wireless charging device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0049] Among the current wireless charging technologies, magnetic induction coupling and resonant coupling are the most widely used. Both of these technical solutions are based on the principle of electromagnetic induction. The high-frequency alternating current of the transmitting coil generates a high-frequency magnetic field, and the energy is transferred from the transmitting coil to the receiving coil through the high-frequency magnetic field to achieve wireless charging. The usual wireless charging system consists of a power transmitter connected to the mains and a power receiver connected to the load. There is no electrical contact between the power transmitter and the power receiver, and wireless energy transmission is performed by electromagnetic induction.

[0050] As wireless charging products become smaller and smaller, the size of the coil is sometimes limited by the structure and appearance and cannot be made larger, and the efficiency of wireless power transmission is often relatively low. At the same time, there is an air gap between the transmitting coil of the power transmitter of the wireless charging system and the receiving coil of the power receiver, and various foreign objects may enter in the middle of the air gap. When there is a metal foreign object, due to the eddy current effect of the metal in the time-varying magnetic field, eddy currents will be generated in the metal, causing the metal to heat up, and there is a possibility of spontaneous combustion (such as tin foil will spontaneously combust when the temperature reaches a certain level) or burning other items (metal heating causes the leaves and paper on it to burn), which will reduce the energy transmission efficiency of the wireless charging system. In order to ensure the safe operation and transmission efficiency of the system, foreign object detection must be performed.

[0051] In current wireless charging systems, the induction voltage method is often used for foreign object detection. The principle of the induction voltage method is to place the detection circuit in a high-frequency magnetic field, and determine whether the magnetic field is distorted by judging whether the induced voltage of the detection circuit is abnormal, and then determine whether there is a foreign object. The existing wireless charging detection method has insufficient detection accuracy and is prone to misjudgment. It mainly has a good detection effect on metal foreign objects, and the detection accuracy of non-metallic foreign objects is even more inaccurate.

[0052] Based on this, an embodiment of the present invention provides an embodiment of a foreign object detection method for a wireless charging device. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0053] In this embodiment, a foreign body detection method for a wireless charging device is provided, which can be used for a main control unit of the wireless charging device such as a CPU, a single chip microcomputer, etc. The wireless charging device includes a transmitting coil and a receiving coil, wherein the transmitting coil is installed in a charging base, and the receiving coil is installed in a charging device. Figure 1 is a flow chart of a foreign object detection method for a wireless charging device according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0054] Step S101, after detecting that the charging device is placed on the charging base and enters the charging mode, the real-time current of the transmitting coil and the real-time voltage of the receiving coil are obtained.

[0055] Specifically, current detection on the transmitting coil and voltage detection on the receiving coil can be achieved by utilizing a current sampling circuit and a voltage sampling circuit or a current / voltage acquisition device in the prior art, but the present invention is not limited thereto.

[0056] Step S102: drawing a real-time charging curve based on the real-time current and the real-time voltage.

[0057] Specifically, the real-time charging curve is composed of a charging voltage curve and a charging current curve. The charging current curve can be drawn according to the sampling time of the real-time current, and the charging voltage curve can be drawn according to the sampling time of the real-time voltage.

[0058] Step S103, comparing the real-time charging curve with the standard charging curve to determine the foreign object detection result of the wireless charging device, where the standard charging curve is a charging curve corresponding to when there is no foreign object in the wireless charging device.

[0059] Specifically, when the real-time charging curve is consistent with the standard charging curve, the foreign object detection result of the wireless charging device is determined to be no foreign object. Otherwise, if the real-time charging curve is inconsistent with the standard charging curve, the foreign object detection result of the wireless charging device is determined to be foreign object.

[0060] The embodiment of the present invention obtains the current of the transmitting coil and the voltage of the receiving coil in the wireless charging device in real time to draw a real-time charging curve during the process of the wireless charging device charging the charging device. The current of the transmitting coil is related to the induction distance between the transmitting coil and the receiving coil. When a foreign object exists, the induction distance will be affected, but the voltage of the receiving coil will not be affected. Therefore, by comparing it with the standard charging curve, that is, the charging curve corresponding to the absence of foreign objects, the foreign object detection function of the wireless charging device is realized, and accurate foreign object detection can be achieved for both metal foreign objects and non-metal foreign objects, which is beneficial to improving the charging efficiency of the wireless charging device and improving the user experience.

[0061] In this embodiment, a foreign body detection method for a wireless charging device is also provided, which can be used for a main control unit of the wireless charging device such as a CPU, a single-chip microcomputer, etc. The wireless charging device includes a transmitting coil and a receiving coil, wherein the transmitting coil is installed in a charging base, and the receiving coil is installed in a charging device. Figure 2 is a flow chart of a foreign object detection method for a wireless charging device according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0062] Step S201, after detecting that the charging device is placed on the charging base and enters the charging mode, obtain the real-time current of the transmitting coil and the real-time voltage of the receiving coil. Figure 1 The relevant description of step S101 is not repeated here.

[0063] Step S202: Draw a real-time charging curve based on the real-time current and real-time voltage. Figure 2 The description of step S102 is not repeated here.

[0064] Step S203, comparing the real-time charging curve with the standard charging curve to determine the foreign object detection result of the wireless charging device, where the standard charging curve is a charging curve corresponding to when there is no foreign object in the wireless charging device.

[0065] The real-time charging curve and the standard charging curve both include: a charging voltage curve and a charging current curve. Specifically, the above step S203 includes:

[0066] Step S2031, taking the charging voltage curve in the real-time charging curve as a reference, determining whether each charging current value on the charging current curve in the real-time charging curve at each charging voltage is within the upper and lower limit range of the charging current curve at the same charging voltage in the standard charging curve.

[0067] Specifically, the upper and lower limits of the charging current curve in the standard charging curve can be determined by performing multiple charging tests on the wireless charging device without foreign matter, and then finally determining the upper and lower limits of the charging current curve based on the multiple test results. Figure 3 shown.

[0068] Step S2032: when each charging current value on the charging current curve in the real-time charging curve at each charging voltage is within the upper and lower limit range of the charging current curve at the same charging voltage in the standard charging curve, it is determined that the foreign object detection result of the wireless charging device is no foreign object.

[0069] The embodiment of the present invention uses the charging voltage curve in the real-time charging curve as a reference, and compares the corresponding charging current values ​​under various charging voltages. If the charging current value is within the upper and lower limit range of the standard charging curve, it is considered that the real-time charging curve conforms to the standard charging curve. At this time, there is no foreign matter between the transmitting coil and the receiving coil, thereby achieving accurate detection of no foreign matter and ensuring the accuracy of the detection result.

[0070] Step S2033, when the charging current values ​​on the charging current curve in the real-time charging curve at each charging voltage are not all within the upper and lower limit ranges of the charging current curve at the same charging voltage in the standard charging curve, it is determined that the foreign object detection result of the wireless charging device is that there is a foreign object.

[0071] The embodiment of the present invention uses the charging voltage curve in the real-time charging curve as a reference, and compares the corresponding charging current values ​​under various charging voltages. If the charging current value is not within the upper and lower limit intervals of the standard charging curve, it is considered that the real-time charging curve does not conform to the standard charging curve. At this time, there is a foreign object between the transmitting coil and the receiving coil, thereby achieving accurate detection of the foreign object and ensuring the accuracy of the detection result.

[0072] Step S204: performing charging control and / or foreign object alarm on the wireless charging device based on the foreign object detection result of the wireless charging device.

[0073] The embodiment of the present invention realizes automatic charging control of the wireless charging device by utilizing the foreign object detection result of the wireless charging device to control the charging of the wireless charging device and / or issue a foreign object alarm, thereby further improving the user experience while ensuring the charging efficiency of the wireless charging device.

[0074] Specifically, the above step S204 includes:

[0075] Step a1: When the foreign object detection result is that there is no foreign object, the charging base is maintained in a charging mode for charging the charging device.

[0076] Exemplarily, when the charging device is a lithium battery, if the foreign object detection result of the wireless charging device is that there is no foreign object, the wireless charging device is controlled to charge the lithium battery normally, and the charging is stopped and the work is terminated after the lithium battery is fully charged.

[0077] Step a2: When the foreign object detection result indicates that there is a foreign object, the charging base is stopped from charging the charging device and / or a foreign object alarm is issued.

[0078] Exemplarily, when the charging device is a lithium battery, if the foreign object detection result of the wireless charging device is that there is a foreign object, charging the lithium battery is stopped, a foreign object protection program is executed, and a foreign object warning is issued through a prompt light or sound to prompt the user to remove the foreign object.

[0079] The embodiments of the present invention ensure the charging efficiency of the charging device during the charging process and improve the user experience by charging the charging device normally when there is no foreign object. When a foreign object is present, the charging is stopped and a foreign object alarm is issued to promptly remind the user to perform operations such as cleaning the foreign object, thereby further ensuring the charging efficiency of the subsequent charging process and further improving the user experience.

[0080] In an embodiment of the present invention, a wireless charging device is also provided. Figure 4 As shown, the wireless charging device includes: a transmitting coil 401 and a receiving coil 402, the transmitting coil 401 is installed in a charging base 403, and the receiving coil 402 is installed in a charging device 404. The wireless charging device also includes: a main control unit ( Figure 4 (not shown), the specific working process of the main control unit refers to the relevant description of the above method embodiment, which will not be repeated here.

[0081] In some optional embodiments, such as Figure 4 As shown, the surfaces of the transmitting coil 401 and the receiving coil 402 are respectively attached to the contact area of ​​the shell of the charging base 403 and the shell of the charging device 404 to minimize the distance between the transmitting coil 401 and the receiving coil 402.

[0082] In the embodiment of the present invention, the surfaces of the transmitting coil and the receiving coil are respectively attached to the contact areas of the charging base housing and the charging device housing to ensure that the distance between the transmitting coil and the receiving coil is minimized, so as to maximize the charging efficiency of the wireless charging device and improve the user experience.

[0083] In some optional embodiments, the magnetic isolation sheets 501 of the transmitting coil 401 and the receiving coil 402 are provided with wire grooves 502, and the inner leads 503 of the transmitting coil 401 and the receiving coil 402 are led out from the bottom through the wire grooves. Figure 5A As shown, the front structure of the transmitting coil 401 is as follows Figure 5B shown.

[0084] In the embodiment of the present invention, a wire passing groove is provided on the magnetic isolation sheet of the transmitting coil and the receiving coil, and the inner lead wires of the transmitting coil and the receiving coil are led out from the bottom through the wire passing groove, thereby further reducing the distance between the lead wires of the transmitting coil and the receiving coil, and further ensuring the charging efficiency of the wireless charging device.

[0085] In some optional embodiments, such as Figure 6 As shown, the wireless charging device also includes: a detection unit 602 and an operation display unit 603 connected to the main control unit 601, wherein the detection unit 602 is used to sample and detect the real-time current of the transmitting coil 401 and the real-time voltage of the receiving coil 402, and send the detection results to the main control unit 601. The operation display unit 603 is used to display the current function mode of the wireless charging device based on the user operation, and to issue a foreign object alarm when receiving the foreign object alarm control instruction from the main control unit 601. Figure 6 The description is made by taking the charging device as a lithium battery 604 as an example. In practical applications, the charging device may also be other devices capable of wireless charging, such as a mobile phone, etc. The present invention is not limited thereto.

[0086] Specifically, Figure 6 As shown, the detection unit 602 includes: a receiving end voltage / current detection unit 6022 and a transmitting end voltage / current detection unit 6021, so as to respectively implement the voltage / current detection functions of the receiving coil and the transmitting coil.

[0087] Exemplarily, the detection unit 602 is a circuit or device with a current / voltage detection function, and the operation display unit 603 is a display screen with a button or touch function. This is only an example, and the present invention is not limited to this.

[0088] The embodiment of the present invention realizes the current detection of the transmitting coil and the voltage detection function of the receiving coil by setting the detection unit, and facilitates the user to perform function mode operation and abnormal alarm prompts by setting the operation display unit, thereby further improving the user experience.

[0089] The specific working process of the foreign object detection method for a wireless charging device provided by an embodiment of the present invention will be described in detail below in conjunction with specific application examples.

[0090] The embodiment of the present invention provides a coil structure of an efficient wireless charging device based on a small coil size, which facilitates efficient charging even with a small coil size. Based on this, a control method for foreign object detection of a wireless charging device is proposed to achieve accurate foreign object detection.

[0091] by Figure 6 For example, the wireless charging device includes: a main control unit 601, a receiving end voltage / current detection unit 6022, a transmitting end voltage / current detection unit 6021, an operation display unit 603 and a lithium battery 604.

[0092] The main control unit 601 mainly collects the voltage / current of the transmitting coil 401 and the receiving coil 402, and performs corresponding data calculation and processing. If the voltage / current is normal, the lithium battery 604 is charged. If the voltage / current is abnormal, the charging of the lithium battery 604 is stopped and a signal is output to the operation display unit 603.

[0093] The receiving end voltage / current detection unit 6022 mainly samples and detects the voltage / current of the receiving coil.

[0094] The transmitting end voltage / current detection unit 6021 mainly samples and detects the voltage / current of the transmitting coil.

[0095] The operation display unit 603 mainly displays the current function mode and prompts a foreign object alarm at the same time, so that the user can see the abnormal signal and remove the foreign object.

[0096] The main function of the lithium battery 604 is to store electrical energy.

[0097] The structural features of the wireless charging device are as follows:

[0098] 1. The transmitting coil 401 of the device is installed in the charging base 403, and the receiving coil 402 is installed in the body of the charging device 404. The surfaces of the two coils are respectively close to the shell of the charging base 403 and the body shell to ensure that the distance between the two coils is minimized.

[0099] 2. The magnetic isolation sheets 501 of the transmitting coil 401 and the receiving coil 402 of the device are provided with wire grooves 502, and the inner leads 503 of the coils are led out from the bottom through the wire grooves 502. In the prior art, the inner leads are all led out from the surface of the coil, which will increase the distance between the two coils. The increase in the coil distance will reduce the charging efficiency. The bottom lead method of the embodiment of the present invention can fundamentally solve this problem.

[0100] The typical working process of the wireless charging device is as follows: Figure 7 shown.

[0101] Place the device into the charging base and enter charging mode.

[0102] The charging of lithium batteries has inherent characteristics. The corresponding current and voltage are different in each different stage. However, for the same device, the charging curve changes are basically the same. In particular, the voltage and current of the receiving coil are only related to the stage of battery charging.

[0103] The voltage and current of the transmitting coil are related to many factors, such as the distance between the two coils and whether there are foreign objects between the coils.

[0104] The main control unit collects the current and voltage signals of the receiving coil under normal conditions, draws and stores the curve of the entire charging stage. At the same time, the current and voltage signals of the transmitting coil under normal conditions are collected and stored corresponding to the signals of the receiving coil. The stored normal curve is used as the standard charging curve, and the current and voltage signals are collected and the curve is drawn each time the battery works. The curve of each operation is compared with the standard charging curve.

[0105] When the distance between the two coils increases or there is a foreign object between the coils, the voltage and current of the transmitting coil will change significantly. At this time, the voltage / current curve deviates from the standard charging curve and does not conform to the standard charging curve. The foreign object protection program is executed and charging is stopped.

[0106] like Figure 3 As shown, the specific curve judgment process is: taking the charging voltage curve of the standard charging curve as a reference, judging the size of the charging current of the transmitting coil under the voltage; if the charging current is within the upper and lower limit intervals of the charging current curve of the standard charging curve, it is considered that the charging curve meets the standard charging curve, and the lithium battery is charged normally. After the battery is fully charged, charging is stopped and the work is terminated; if the charging current is not within the upper and lower limit intervals of the charging current curve of the standard charging curve, it is considered that there is a foreign object between the two coils.

[0107] Since the above scheme only collects voltage and current parameters, whether the metal foreign matter affects the induced voltage or the non-metal foreign matter affects the sensing distance, it can be reflected through the voltage / current curve, so it can accurately determine whether there is a foreign matter between the two coils. The above scheme solves the problem of low efficiency of wireless charging of small coils from a structural perspective, and solves the problem of low accuracy of foreign matter detection from a detection method perspective.

[0108] In an embodiment of the present invention, a foreign body detection system for a wireless charging device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and will not be repeated here. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0109] This embodiment provides a foreign object detection system for a wireless charging device. Figure 8 As shown, the foreign object detection system of the wireless charging device includes:

[0110] The acquisition module 801 is used to acquire the real-time current of the transmitting coil and the real-time voltage of the receiving coil after detecting that the charging device is placed on the charging base and enters the charging mode;

[0111] A first processing module 802 is used to draw a real-time charging curve based on the real-time current and the real-time voltage;

[0112] The second processing module 803 is used to compare the real-time charging curve with the standard charging curve to determine the foreign object detection result of the wireless charging device, where the standard charging curve is a charging curve corresponding to when there is no foreign object in the wireless charging device.

[0113] In some optional implementations, the second processing module 803 includes:

[0114] A first processing unit, for determining, based on the charging voltage curve in the real-time charging curve, whether each charging current value on the charging current curve in the real-time charging curve at each charging voltage is within an upper and lower limit interval of the charging current curve at the same charging voltage in the standard charging curve;

[0115] The second processing unit is used to determine that the foreign object detection result of the wireless charging device is no foreign object when each charging current value on the charging current curve in the real-time charging curve under each charging voltage is within the upper and lower limit range of the charging current curve under the same charging voltage in the standard charging curve.

[0116] In some optional implementations, the second processing module 803 further includes:

[0117] The third processing unit is used to determine that the foreign object detection result of the wireless charging device is that there is a foreign object when the various charging current values ​​on the charging current curve in the real-time charging curve under various charging voltages are not all within the upper and lower limit ranges of the charging current curve under the same charging voltage in the standard charging curve.

[0118] In some optional embodiments, the wireless charging device foreign object detection system further includes:

[0119] The third processing module is used to perform charging control and / or foreign object alarm on the wireless charging device based on the foreign object detection result of the wireless charging device.

[0120] In some optional implementations, the third processing module includes:

[0121] A fourth processing unit, configured to maintain a charging mode in which the charging base charges the charging device when the foreign object detection result is that there is no foreign object;

[0122] The fifth processing unit is used to stop the charging base from charging the charging device and / or issue a foreign object alarm when the foreign object detection result is that there is a foreign object.

[0123] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0124] The foreign object detection system for the wireless charging device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0125] See also Fig. 9 , Fig. 9 is a schematic diagram of the structure of a main control unit of a wireless charging device provided by an optional embodiment of the present invention, such as Fig. 9 As shown, the main control unit includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Fig. 9 A processor 10 is taken as an example.

[0126] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0127] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0128] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0129] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0130] The main control unit also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 can be connected via a bus or other means. Figure 8 The example of connecting through bus is taken in the following.

[0131] The input device 30 can receive input digital or character information, and generate key signal input related to the user settings and function control of the computer device, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, an indicator bar, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED) and a tactile feedback device (e.g., a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0132] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0133] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A foreign body detection method for a wireless charging device, the wireless charging device include: A transmitting coil and a receiving coil, wherein the transmitting coil is installed in a charging base and the receiving coil is installed in a charging device, wherein the method comprises: After detecting that the charging device is placed on the charging base and enters the charging mode, obtaining the real-time current of the transmitting coil and the real-time voltage of the receiving coil; Draw a real-time charging curve based on the real-time current and the real-time voltage; The real-time charging curve is compared with a standard charging curve to determine a foreign object detection result of the wireless charging device, wherein the standard charging curve is a charging curve corresponding to when no foreign object exists in the wireless charging device.

2. The method according to claim 1, It is characterized in that The real-time charging curve and the standard charging curve both include: a charging voltage curve and a charging current curve, and comparing the real-time charging curve with the standard charging curve to determine the foreign object detection result of the wireless charging device includes: Taking the charging voltage curve in the real-time charging curve as a reference, determining whether each charging current value on the charging current curve in the real-time charging curve at each charging voltage is within the upper and lower limit intervals of the charging current curve at the same charging voltage in the standard charging curve; When each charging current value on the charging current curve in the real-time charging curve at each charging voltage is within the upper and lower limit range of the charging current curve at the same charging voltage in the standard charging curve, it is determined that the foreign object detection result of the wireless charging device is no foreign object.

3. The method according to claim 2, It is characterized in that The method further comprises: When each charging current value on the charging current curve in the real-time charging curve at each charging voltage is not within the upper and lower limit intervals of the charging current curve at the same charging voltage in the standard charging curve, it is determined that the foreign object detection result of the wireless charging device is that there is a foreign object.

4. The method according to any one of claims 1 to 3, It is characterized in that The method further comprises: Based on the foreign object detection result of the wireless charging device, charging control and / or foreign object alarm are performed on the wireless charging device.

5. The method according to claim 4, It is characterized in that The method of controlling charging of the wireless charging device and / or issuing a foreign object alarm based on the foreign object detection result of the wireless charging device includes: When the foreign object detection result is that there is no foreign object, maintaining the charging mode in which the charging base charges the charging device; When the foreign object detection result indicates that there is a foreign object, the charging base is stopped from charging the charging device and / or a foreign object alarm is issued.

6. A foreign body detection system for a wireless charging device, the wireless charging device include: A transmitting coil and a receiving coil, wherein the transmitting coil is installed in a charging base and the receiving coil is installed in a charging device, wherein the system comprises: An acquisition module, configured to acquire the real-time current of the transmitting coil and the real-time voltage of the receiving coil after detecting that the charging device is placed on the charging base and enters a charging mode; A first processing module, configured to draw a real-time charging curve based on the real-time current and the real-time voltage; The second processing module is used to compare the real-time charging curve with a standard charging curve to determine a foreign object detection result of the wireless charging device, wherein the standard charging curve is a charging curve corresponding to when there is no foreign object in the wireless charging device.

7. A wireless charging device, the wireless charging device include: The transmitting coil and the receiving coil are installed in the charging base, and the receiving coil is installed in the charging device. The wireless charging device further comprises: a main control unit, and the main control unit comprises: a memory and a processor. The memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 5 by executing the computer instructions.

8. The wireless charging device according to claim 7, It is characterized in that The surfaces of the transmitting coil and the receiving coil are respectively attached to the contact areas of the shell of the charging base and the shell of the charging device, so as to minimize the distance between the transmitting coil and the receiving coil.

9. The wireless charging device according to claim 7, It is characterized in that The magnetic isolation sheets of the transmitting coil and the receiving coil are provided with wire passing grooves, and the inner leads of the transmitting coil and the receiving coil are led out from the bottom through the wire passing grooves.

10. The wireless charging device according to any one of claims 7 to 9, It is characterized in that The wireless charging device further includes: a detection unit and an operation display unit connected to the main control unit, wherein: The detection unit is used to sample and detect the real-time current of the transmitting coil and the real-time voltage of the receiving coil, and send the detection result to the main control unit; The operation display unit is used to display the current function mode of the wireless charging device based on user operation, and to perform a foreign object alarm when receiving a foreign object alarm control instruction from the main control unit.

11. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method according to any one of claims 1 to 5.

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