Wireless charging test equipment

Abstract

The embodiment of the invention provides wireless charging test equipment, belongs to the technical field of wireless charging, and can simplify the test process of a forward wireless charging function and a reverse wireless charging function of electronic equipment. The wireless charging test equipment comprises a test clamp which is used for placing tested equipment; a forward charging circuit; a reverse charging circuit; the coil is located at the bottom of the test fixture; the coil is electrically connected to the forward charging circuit and the reverse charging circuit through the switching unit, the switching unit is used for switching the coil to be communicated with the forward charging circuit or the reverse charging circuit, when the coil is communicated with the forward charging circuit, the forward charging circuit and the coil form a forward wireless charging assembly, and when the coil is communicated with the reverse charging circuit, the coil forms a reverse wireless charging assembly; when the coil is connected to the reverse charging circuit, the reverse charging circuit and the coil form a reverse wireless charging assembly.

Description

Technical Field

[0001] The present application relates to the field of wireless charging technology, and in particular to a wireless charging testing device. Background Art

[0002] Current electronic devices, such as mobile phones, have two functions: forward wireless charging and reverse wireless charging. Forward wireless charging refers to charging the mobile phone through a wireless charging stand, and reverse wireless charging refers to using the principle of wireless charging to use the mobile phone as a wireless charging stand to charge other devices, such as wireless headphones. Before a mobile phone leaves the factory, its functions need to be tested. The testing process for the forward wireless charging and reverse wireless charging functions of a mobile phone is relatively cumbersome. Summary of the invention

[0003] The technical solution of the present application provides a wireless charging test device, which can simplify the testing process of the forward wireless charging function and the reverse wireless charging function of an electronic device.

[0004] A wireless charging test device is provided, comprising: a test fixture, the test fixture is used to place a device under test; a forward charging circuit; a reverse charging circuit; a coil, the coil is located at the bottom of the test fixture; a switching unit, the coil is electrically connected to the forward charging circuit and the reverse charging circuit through the switching unit, the switching unit is used to switch the coil to connect to the forward charging circuit or the reverse charging circuit, when the coil is connected to the forward charging circuit, the forward charging circuit and the coil form a forward wireless charging component, when the coil is connected to the reverse charging circuit, the reverse charging circuit and the coil form a reverse wireless charging component.

[0005] In one possible implementation, the forward charging circuit includes a first communication terminal and a power supply terminal; the reverse charging circuit includes a second communication terminal and a discharge terminal; the coil has a coil communication terminal and a supply and discharge terminal; the switching unit is used to connect the first communication terminal with the coil communication terminal, connect the power supply terminal with the supply and discharge terminal, cut off the second communication terminal with the coil communication terminal, and cut off the discharge terminal with the supply and discharge terminal, so that the coil is connected to the forward charging circuit; the switching unit is used to cut off the first communication terminal with the coil communication terminal, cut off the power supply terminal with the supply and discharge terminal, connect the second communication terminal with the coil communication terminal, and connect the discharge terminal with the supply and discharge terminal, so that the coil is connected to the reverse charging circuit.

[0006] In a possible embodiment, the wireless charging test device also includes: a control unit, the control unit is communicatively connected to the forward charging circuit, the reverse charging circuit and the switching unit, the control unit is used to control the switching unit, when the coil is connected to the forward charging circuit, the control unit is also used to control the forward charging circuit and communicate with the coil through the forward charging circuit, when the coil is connected to the reverse charging circuit, the control unit is also used to control the reverse charging circuit and communicate with the coil through the reverse charging circuit.

[0007] In a possible implementation, the wireless charging test device further includes: a temperature sensor, where the temperature sensor is used to monitor the temperature of the coil.

[0008] In a possible implementation, when the temperature monitored by the temperature sensor exceeds a threshold, the forward charging circuit stops supplying power to the coil, or the switching unit cuts off the connection between the coil and the forward charging circuit, or generates an alarm signal.

[0009] In a possible implementation, the temperature sensor is electrically connected to the forward charging circuit, and when the forward charging circuit is working, the temperature sensor is driven to work.

[0010] In a possible implementation, the wireless charging test device further includes: a temperature sensor, which is used to monitor the temperature of the coil; the temperature sensor is electrically connected to a control unit, and the control unit is also used to control the operation of the temperature sensor when the forward charging circuit or the reverse charging circuit is operating, and to generate an alarm signal when the temperature monitored by the temperature sensor exceeds a threshold value.

[0011] In a possible implementation, the temperature sensor is a thermistor.

[0012] In a possible implementation, the wireless charging test device further includes: a heat dissipation device, and the heat dissipation device is used to dissipate heat from the coil.

[0013] In a possible implementation manner, the switching unit is an electromagnetic relay.

[0014] In a possible implementation, the wireless charging test device further includes: a near field communication NFC circuit, the NFC circuit is electrically connected to the switching unit, and the switching unit is further used to switch the coil to connect to the NFC circuit.

[0015] In a possible implementation, the wireless charging test device further includes: a test fixture for placing the device under test, and the coil is located at the bottom of the test fixture.

[0016] In a possible implementation, the wireless charging test device further includes: a discharge energy release device, wherein the discharge energy release device is electrically connected to the reverse charging circuit.

[0017] The wireless charging test device of the embodiment of the present application can connect the coil to the forward charging circuit or the reverse charging circuit through the switching unit, thereby realizing time-sharing multiplexing of the coil. The forward charging function and the reverse charging function can be realized through the same coil. In this way, during the process of wireless charging test of the electronic device, there is no need to manually remove the electronic device and place the electronic device again, and the test of two wireless charging functions can be realized, which simplifies the test process and the test equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a wireless charging test device in the related art;

[0019] Figure 2 This is a structural block diagram of a wireless charging test device in an embodiment of the present application;

[0020] Figure 3 This is a structural schematic diagram of a wireless charging test device in an embodiment of the present application;

[0021] Figure 4 for Figure 2 A top view of the wireless charging test equipment.

[0022] Figure 5 This is a structural block diagram of another wireless charging test device in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of the interaction between a wireless charging test device and a mobile phone in an embodiment of the present application;

[0024] Figure 7 This is a flow chart of a wireless charging test in an embodiment of the present application;

[0025] Figure 8 This is a structural block diagram of another wireless charging test device in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0027] Before describing the embodiments of the present application, the related technology is first introduced. In the related technology, in order to test the forward wireless charging function and the reverse wireless charging function of the mobile phone, the following is used: Figure 1The device shown includes a forward charging fixture and a reverse charging fixture. The bottom of the forward charging fixture has a corresponding wireless transmitting TX coil, and the bottom of the reverse charging fixture has a corresponding wireless receiving RX coil. During the test, the mobile phone is first placed on the forward charging fixture, and the mobile phone is wirelessly charged through the TX coil to achieve a forward charging test. After the forward charging test is completed, the mobile phone is manually taken down and placed on the reverse charging fixture, and the mobile phone is discharged through the RX coil to achieve a reverse charging test. Since the mobile phone needs to be manually removed and placed, the test time is relatively long and the test process is cumbersome. The embodiments of the present application can solve the above problems, and the embodiments of the present application are described below.

[0028] like Figure 2 , Figure 3 and Figure 4 As shown, an embodiment of the present application provides a wireless charging test device, including: a test fixture 30, the test fixture 30 is used to place a device under test; a forward charging circuit 1; a reverse charging circuit 2; a coil 3, the coil 3 is located at the bottom of the test fixture 30; a switching unit 4, the coil 3 is electrically connected to the forward charging circuit 1 and the reverse charging circuit 2 through the switching unit 4, the switching unit 4 is used to switch the coil 3 to connect to the forward charging circuit 1 or the reverse charging circuit 2, that is, the switching unit 4 has a multi-way switching switch, which can select the coil 3 and the forward charging circuit 1, and can also select the coil 3 and the reverse charging circuit 2. When the coil 3 is connected to the forward charging circuit 1, the forward charging circuit 1 and the coil 3 form a forward wireless charging component, and the forward wireless charging component can realize the forward wireless charging function. When the coil 3 is connected to the reverse charging circuit 2, the reverse charging circuit 2 and the coil 3 form a reverse wireless charging component, and the reverse wireless charging component can realize the reverse wireless charging function.

[0029] Specifically, whether it is forward charging or reverse charging, the coil 3 needs to be used to realize the wireless transmission of electric energy, so the forward charging circuit 1 and the reverse charging circuit 2 can share the same coil 3, and the switching unit 4 can realize the time-sharing multiplexing of the coil 3 by the forward charging circuit 1 and the reverse charging circuit 2. When testing, the electronic device to be tested, such as a mobile phone, can be placed on the coil first, and the forward charging circuit 1 is first controlled by the switching unit 4 to connect to the coil 3, and a forward wireless charging component is formed between the two to provide the mobile phone with a forward wireless charging function, thereby testing the forward wireless charging function. After the test of the forward wireless charging function is completed, the reverse charging circuit 2 can be controlled by the switching unit 4 to connect to the coil 3, and a reverse wireless charging component is formed between the two to provide the mobile phone with a reverse wireless charging function, thereby testing the wireless charging function. In the process of reverse wireless charging of the mobile phone, the electric energy of the mobile phone is reversely charged through the coil 3 and the reverse charging circuit 2. Figure 3 and Figure 4In the structure shown, the wireless charging test device has four test fixtures 30, each test fixture 30 has a corresponding coil 3, and each coil corresponds to an independent forward charging circuit 1, reverse charging circuit 2 and switching unit 4, etc., that is, each test fixture 30 can realize the forward wireless charging function test and reverse wireless charging function test of a mobile phone. The test process can be completed by the same test fixture 30 and coil 3, without manually picking up the mobile phone, and only one set of test fixtures and coils is needed to realize the forward and reverse wireless power supply function tests. The structure of the wireless charging test equipment is simpler and the cost is lower.

[0030] The wireless charging test device of the embodiment of the present application can connect the coil to the forward charging circuit or the reverse charging circuit through the switching unit, thereby realizing time-sharing multiplexing of the coil. The forward charging function and the reverse charging function can be realized through the same coil. In this way, during the process of wireless charging test of the electronic device, there is no need to manually remove the electronic device and place the electronic device again, and the test of two wireless charging functions can be realized, which simplifies the test process and the test equipment.

[0031] In a possible implementation, the wireless charging test device further includes: a discharge energy release device 5, the discharge energy release device 5 is electrically connected to the reverse charging circuit 2, and the discharge energy release device 5 is used to release the electric energy obtained by the reverse charging circuit 2 as a load when the reverse charging circuit 2 is working. The discharge energy release device 5 can be any device that can consume electric energy as a load, for example, it can be a resistor. During the process of reverse wireless charging of the mobile phone, the electric energy of the mobile phone enters the discharge energy release device 5 through the coil 3 and the reverse charging circuit 2, and is released in the discharge energy release device 5 to simulate the process of reverse wireless charging of the mobile phone to other electronic devices. In other possible implementations, an energy storage device connected to the reverse charging circuit 2 can also be set in the wireless charging test device. During the reverse charging process, the electric energy of the mobile phone enters the energy storage device through the coil 3 and the reverse charging circuit 2 to simulate the process of reverse wireless charging of the mobile phone to other electronic devices.

[0032] In a possible implementation, the forward charging circuit 1 includes a first communication terminal S1 and a power supply terminal P1; the reverse charging circuit 2 includes a second communication terminal S2 and a discharge terminal P2; the coil 3 has a coil communication terminal S3 and a supply and discharge terminal P3; the switching unit 4 is used to connect the first communication terminal S1 with the coil communication terminal S3, connect the power supply terminal P1 with the supply and discharge terminal P3, cut off the second communication terminal S2 with the coil communication terminal S3, and cut off the discharge terminal P2 with the supply and discharge terminal P3, so that the coil 3 is connected to the forward charging circuit 1; the switching unit 4 is used to cut off the first communication terminal S1 with the coil communication terminal S3, cut off the power supply terminal P1 with the supply and discharge terminal P3, connect the second communication terminal S2 with the coil communication terminal S3, and connect the discharge terminal P2 with the supply and discharge terminal P3, so that the coil 3 is connected to the reverse charging circuit 2.

[0033] In a possible implementation, the wireless charging test device also includes: a control unit 6, the control unit 6 is communicatively connected to the forward charging circuit 1, the reverse charging circuit 2 and the switching unit 4, the control unit 6 is used to control the switching unit 4, when the coil 3 is connected to the forward charging circuit 1, the control unit 6 is also used to control the forward charging circuit 1 and communicate with the coil 3 through the forward charging circuit 1, when the coil 3 is connected to the reverse charging circuit 2, the control unit 6 is also used to control the reverse charging circuit 2 and communicate with the coil 3 through the reverse charging circuit 2.

[0034] In a possible implementation, the wireless charging test device further includes: a temperature sensor 7 , where the temperature sensor 7 is used to monitor the temperature of the coil 3 , and the temperature sensor 7 may be disposed near the coil 3 .

[0035] In a possible implementation, when the temperature monitored by the temperature sensor 7 exceeds a threshold, the forward charging circuit 1 stops supplying power to the coil 3, or the switching unit 4 cuts off the connection between the coil 3 and the forward charging circuit 1, or generates an alarm signal. The temperature sensor 7 may be a thermistor. The function of the temperature sensor 7 is to prevent the coil 3 from overheating during operation, thereby preventing the circuit from being abnormal or damaged.

[0036] In a possible implementation, Figure 2 As shown, the temperature sensor 7 is electrically connected to the forward charging circuit 1. When the forward charging circuit 1 is working, the temperature sensor 7 is driven to work. Compared with the reverse charging process, the power of the forward charging is relatively large, so the heat is also relatively large, which may easily cause the coil 3 to overheat and damage the circuit. Therefore, only the forward charging circuit 1 can be used to drive the temperature sensor 7 to reduce costs.

[0037] In a possible implementation, Figure 5As shown, the temperature sensor 7 can be connected to the control unit 6 for communication, and the control unit 6 obtains the detected temperature for further control. Figure 2 In the structure shown, the temperature sensor 7 is electrically connected to the forward charging circuit 1, and the control unit 6 can be electrically connected to the temperature sensor 7 through the forward charging circuit 1. For example, when the control unit 6 obtains that the temperature monitored by the temperature sensor 7 exceeds the threshold, the forward charging circuit 1 can be controlled to reduce the power provided to the coil 3, or the forward charging circuit 1 can be controlled to stop supplying power to the coil 3, or the switching unit 4 can be controlled to cut off the connection between the coil 3 and the forward charging circuit 1, or an alarm signal can be generated. The alarm signal can remind the user that the coil 3 is overheated through an additional buzzer, or through an additional display. In other words, the temperature sensor 7 can also be directly controlled and driven by the control unit 6, which can provide more flexible and comprehensive temperature detection. For example, when the forward charging circuit 1 or the reverse charging circuit 2 is working, the temperature sensor 7 is controlled to work, so that not only the coil temperature during the forward charging process can be monitored, but also the coil temperature during the reverse charging process can be monitored.

[0038] In a possible implementation, the wireless charging test device further includes: a heat sink 8, the heat sink 8 is used to dissipate heat from the coil 3, and the heat sink 8 is, for example, an electric fan. Similar to the temperature sensor 7, the electric fan can be communicatively connected to the control unit 6, and the control unit 6 controls the start, stop and speed of the electric fan. In addition, the control of the electric fan can be based on the temperature monitored by the temperature sensor 7. For example, the higher the temperature monitored by the temperature sensor 7, the faster the speed of the electric fan is controlled to achieve a more effective cooling effect. For another example, when the temperature monitored by the temperature sensor 7 does not exceed the threshold value, the electric fan is controlled not to work, and when the temperature monitored by the temperature sensor 7 exceeds the threshold value, the electric fan is controlled to start working. Similar to the temperature sensor 7, Figure 2 As shown, the heat sink 8 can be electrically connected to the forward charging circuit 1. When the forward charging circuit 1 is working, the heat sink 8 is driven to work. Since the power of the forward charging is relatively large, that is, the heat generated is also relatively large, therefore, only the forward charging circuit 1 can be used to drive the heat sink 8 to reduce the cost. Figure 5 As shown, the heat sink 8 can also be communicatively connected to the control unit 6, and the control unit 6 directly drives and controls the heat sink 8, which can provide more flexible and comprehensive heat dissipation control. For example, when the forward charging circuit 1 or the reverse charging circuit 2 is working, the heat sink 8 is controlled to work, so that the coil 3 can be cooled not only during the forward charging process, but also during the reverse charging process. In addition, the heat sink 8 can be controlled to dissipate heat according to the temperature monitored by the temperature sensor 7.

[0039] In a possible implementation, the switching unit 4 is an electromagnetic relay, and the switch in the electromagnetic relay can realize the switching of the coil 3. For example, the switching unit 4 includes a communication end single-pole double-throw switch M1 and a power supply end single-pole double-throw switch M2, the input end of the communication end single-pole double-throw switch M1 is connected to the coil communication end S3, the two output ends of the communication end single-pole double-throw switch M1 are respectively connected to the first communication end S1 and the second communication end S2, the input end of the power supply end single-pole double-throw switch M2 is connected to the power supply and discharge end P3, and the two output ends of the power supply end single-pole double-throw switch M2 are respectively connected to the power supply end P1 and the discharge end P2.

[0040] In a possible implementation, the wireless charging test device further includes a charger 21, which is used to power the forward charging circuit 1. The forward charging circuit 1 includes a boost conversion circuit. During the forward wireless charging function test, the electric energy provided by the charger 21 is boosted in the forward charging circuit 1 and provided to the coil 3, and then the mobile phone is wirelessly charged through the coil 3. The charger 21 can be specifically electrically connected to the forward charging circuit 1 through a Type-C interface. The wireless charging test device also includes a 24V power supply 23, which is electrically connected to the control unit 6 and is used to power the control unit 6. The control unit 6 can be a microcontroller unit (MCU) or a single-chip computer. Due to the difference in power supply voltage required by the control unit 6 and the forward charging circuit 1, the embodiment of the present application respectively powers the forward charging circuit 1 through the charger 21 and powers the control unit 6 through the 24V power supply 23. It can be understood that in some embodiments, both can also be powered by the same power supply, and the voltage difference can be adjusted by a voltage conversion circuit. The wireless charging test equipment also includes a host computer 24 that is communicatively connected to the control unit 6. The host computer 24 can be, for example, a computer. The host computer 24 can realize communication connection with the control unit 6 through a USB to URAT interface. The control unit 6 can be controlled by the host computer 24, and the status of each device during the test can also be obtained to facilitate the analysis of the test. In addition, during the test, the control of the switching unit 4 can be switched manually through the operation of the host computer 24, or it can be switched automatically according to time or other conditions through a preset program in the host computer 24.

[0041] The following example illustrates the interaction between the device under test and the test equipment. Figure 6As shown, during the forward charging process, the coil is connected to the forward charging circuit, and the charger inverts the DC current into AC current. After the BOOST boost circuit in the forward charging circuit, the input voltage is increased. At this time, the transmitting TX coil (the coil in the wireless charging test equipment) will detect the receiving RX coil (the coil in the mobile phone), and exchange product information, including encryption authentication, and charge. The electric energy received by the RX coil is controlled by the chip and the voltage regulating circuit and adjusted to a DC charging voltage suitable for the mobile phone battery. After the forward charging test is completed, the switching unit 4 switches the coil in the test equipment to the reverse charging circuit. The coil in the mobile phone is called the TX coil, and the coil in the wireless test equipment is called the RX coil. After the product information, encryption authentication, etc. are exchanged between the mobile phone and the wireless charging test equipment, the mobile phone battery is used as a power source to provide DC current, which is converted into AC current through the inverter circuit, and reversely charges the wireless charging test equipment through the coil.

[0042] like Figure 7 As shown, after the process starts, the forward charging process is first performed, and foreign matter detection is performed through the coil in the wireless charging test equipment to obtain the detection results. There are usually two types of detection results. The first type is no response or no charging need. No response means that no device that needs to be wirelessly charged is detected near the coil, and no charging needs indicate that the device placed near the coil has no need for wireless charging. At this time, this detection process continues until the detection result changes to the second type. The second type of detection result is that a device that needs to be wirelessly charged is detected, and then the next identification and configuration process is entered. During the identification and configuration process, the information reported by the mobile phone will be received through the coil, and the mobile phone will report whether it supports the baseline power profile (Baseline Power Profile, BPP) mode or the extended power (Extended Power Profile, EPP) mode. If the mobile phone supports the BPP mode, there is no need for negotiation, and power transmission can be performed using ≤5W of power. Power transmission is the process of forward wireless charging to the mobile phone through the coil. If the mobile phone supports the EPP mode, the negotiation process will be entered. The negotiation process will send the information of the wireless charging test equipment to the mobile phone and draft a contract. After the negotiation is successful, the calibration process will be entered. The power loss threshold will be calibrated during the calibration process, and the power transmission process will begin after successful calibration. During the identification and configuration, negotiation or calibration process, if an error or failure occurs, the renegotiation process will begin. If the renegotiation is successful, the power transmission process will begin to implement the forward charging test. After the forward charging test is completed, the coil is switched to connect to the reverse charging circuit, and then the reverse charging circuit negotiates with the mobile phone to determine the reverse charging protocol supported by the mobile phone and the reverse charging circuit, and then power is transmitted based on the negotiated protocol, i.e. reverse charging.

[0043] In a possible implementation, Figure 8 As shown, the wireless charging test equipment also includes: a near field communication (NFC) circuit 20, the NFC circuit 20 is electrically connected to the switching unit 4, and the switching unit 4 is also used to switch the coil 3 to the NFC circuit 20. The NFC circuit 20 is electrically connected to the control unit 6 and can be controlled by the control unit 6. The NFC circuit 20 has an NFC communication terminal S4 and an NFC power supply terminal P4. The switching unit 4 can control the conduction and cutoff between the NFC communication terminal S4 and the coil communication terminal S3, and can also control the conduction and cutoff between the NFC power supply terminal P4 and the supply and discharge terminal P3 of the coil 3. When the coil 3 is connected to the NFC circuit 20, the two form an NFC component. Since the NFC function can also use the coil 3 as an NFC antenna to realize the radiation transmission of the signal, the NFC circuit 20 can be added to the wireless charging test equipment to realize the test of the NFC function. For example, after the forward wireless charging function and the reverse wireless charging function of the mobile phone are tested, there is no need to pick up the mobile phone. It is only necessary to switch the coil 3 to the NFC circuit 20 through the switching unit 4, that is, the coil 3 can be used as an NFC antenna to realize the test of the NFC function between the mobile phone.

[0044] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or the second signal line may represent the existence of A alone, the existence of A and the second signal line at the same time, and the existence of the second signal line alone. Among them, A, the second signal line can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, a, at least one of the second signal line and the third signal line can represent: a, the second signal line, the third signal line, a-the second signal line, a-the third signal line, the second signal line-the third signal line, or a-the second signal line-the third signal line, wherein a, the second signal line, the third signal line can be single or multiple.

[0045] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A wireless charging test device, characterized in that: include: A test fixture, wherein the test fixture is used to place the device under test; Forward charging circuit; Reverse charging circuit; a coil, the coil being located at the bottom of the test fixture; A switching unit, wherein the coil is electrically connected to the forward charging circuit and the reverse charging circuit through the switching unit, and the switching unit is used to switch the coil to be connected to the forward charging circuit or the reverse charging circuit. When the coil is connected to the forward charging circuit, the forward charging circuit and the coil constitute a forward wireless charging component, and when the coil is connected to the reverse charging circuit, the reverse charging circuit and the coil constitute a reverse wireless charging component.

2. The wireless charging test equipment according to claim 1, characterized in that: The forward charging circuit includes a first communication terminal and a power supply terminal; The reverse charging circuit includes a second communication terminal and a discharge terminal; The coil has a coil communication end and a supply and discharge end; The switching unit is used to connect the first communication end with the coil communication end, connect the power supply end with the supply and discharge end, disconnect the second communication end with the coil communication end, and disconnect the discharge end with the supply and discharge end, so that the coil is connected to the positive charging circuit; The switching unit is used to cut off the connection between the first communication end and the coil communication end, cut off the connection between the power supply end and the supply and discharge end, connect the second communication end and the coil communication end, and connect the discharge end and the supply and discharge end, so that the coil is connected to the reverse charging circuit.

3. The wireless charging test device according to claim 1 or 2, characterized in that: Also includes: A control unit, the control unit is communicatively connected to the forward charging circuit, the reverse charging circuit and the switching unit, the control unit is used to control the switching unit, when the coil is connected to the forward charging circuit, the control unit is also used to control the forward charging circuit and communicate with the coil through the forward charging circuit, when the coil is connected to the reverse charging circuit, the control unit is also used to control the reverse charging circuit and communicate with the coil through the reverse charging circuit.

4. The wireless charging test device according to claim 1 or 2, characterized in that: Also includes: A temperature sensor is used to monitor the temperature of the coil.

5. The wireless charging test equipment according to claim 4, characterized in that: When the temperature monitored by the temperature sensor exceeds a threshold value, the forward charging circuit stops supplying power to the coil, or the switching unit cuts off the connection between the coil and the forward charging circuit, or generates an alarm signal.

6. The wireless charging test equipment according to claim 5, characterized in that: The temperature sensor is electrically connected to the forward charging circuit, and when the forward charging circuit is in operation, the temperature sensor is driven to operate.

7. The wireless charging test equipment according to claim 3, characterized in that: Also includes: A temperature sensor, the temperature sensor is used to monitor the temperature of the coil; The temperature sensor is electrically connected to the control unit, and the control unit is also used to control the operation of the temperature sensor when the forward charging circuit or the reverse charging circuit is operating, and to generate an alarm signal when the temperature monitored by the temperature sensor exceeds a threshold.

8. The wireless charging test device according to claim 1 or 2, characterized in that: Also includes: A heat dissipation device is used to dissipate heat from the coil.

9. The wireless charging test device according to claim 1 or 2, characterized in that: The switching unit is an electromagnetic relay.

10. The wireless charging test device according to claim 1 or 2, characterized in that: Also includes: A near field communication (NFC) circuit, wherein the NFC circuit is electrically connected to the switching unit, and the switching unit is further used to switch the coil to connect to the NFC circuit.

11. The wireless charging test device according to claim 1, characterized in that: Also includes: A discharge energy release device is electrically connected to the reverse charging circuit.

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