Power board test circuit and power board test apparatus

Abstract

The application discloses a power board test circuit and a power board test equipment, and the power board is applied to a TV. The power board test circuit comprises a master control circuit, and an output end of the master control circuit is used for accessing a power board to be tested. The master control circuit is used for simulating a control signal of a mainboard of the TV and sending the simulated control signal to the power board to be tested, so that the power board to be tested is driven to work. The application can simulate the control signals of different mainboards, greatly improves the convenience of test, and improves the test efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power board testing, in particular to a power board testing circuit and a power board testing device. BACKGROUND

[0002] As the name implies, the TV power board is a board mainly for power processing. With the development of science and technology, the TV has higher and higher requirements for power supply, and the power processing mode is more and more diversified with the complexity of the subsequent circuit demand. The structure of the power board is more and more complex, and the process is more and more complicated. In order to ensure the yield of the finished product of the power board, a series of strict tests need to be carried out on the power board, and when the power board is abnormal, it also needs to be tested for power-on, power-off, over-temperature, etc.

[0003] However, there is no special debugging device for TV power board on the market. When testing the power board, it is necessary to fly from the main board of the TV to the power board to output the control signal to drive the power board to output the corresponding voltage. The flying line is troublesome and unstable, resulting in low test efficiency. SUMMARY

[0004] The main purpose of the present application is to provide a power board testing circuit and a power board testing device, which aims to solve the technical problem of low test efficiency of the TV power board in the prior art.

[0005] In order to achieve the above purpose, the present application provides a power board testing circuit, which is applied to a TV, comprising:

[0006] A main control circuit, the output end of the main control circuit is used for connecting a to-be-tested power board;

[0007] The main control circuit is used for simulating the control signal sent by the main board of the TV to the to-be-tested power board and sending the simulated control signal to the to-be-tested power board to drive the to-be-tested power board to work.

[0008] Optionally, the power board testing circuit further comprises:

[0009] A test power input end;

[0010] A switch circuit, the input end of the switch circuit is connected with the test power input end, and the output end of the switch circuit is used for connecting a to-be-tested power board;

[0011] The main control circuit is also used for sending a power-on signal or a power-off signal;

[0012] The switch circuit is used for turning on the power board and the test power when receiving the power-on signal, and turning off the power board and the test power when receiving the power-off signal.

[0013] Optionally, the power board test circuit further comprises an input voltage sampling circuit, an input end of the input voltage sampling circuit being connected with the test power input end, and an output end of the input voltage sampling circuit being connected with the main control circuit;

[0014] The input voltage sampling circuit is configured to sample the power voltage input to the power board by the test power and output an input voltage signal.

[0015] The main control circuit is further configured to receive the input voltage signal and output the power-on signal with a preset frequency and / or a preset time length according to the input voltage signal.

[0016] Optionally, the power board test circuit further comprises an output voltage sampling circuit, an input end of the output voltage sampling circuit being connected with an output end of the power board, and an output end of the output voltage sampling circuit being connected with the main control circuit.

[0017] The output voltage sampling circuit is configured to sample the output voltage of the power board and output a corresponding output voltage signal.

[0018] The main control circuit is further configured to determine whether the power board under test has a power failure according to the output voltage signal.

[0019] Optionally, the power board test circuit further comprises a temperature sampling circuit, an output end of the temperature sampling circuit being connected with the main control circuit.

[0020] The temperature sampling circuit is configured to detect the temperature of the power board and output a corresponding temperature signal.

[0021] The main control circuit is further configured to receive the temperature signal and determine whether the power board under test has an over-temperature failure according to the temperature signal.

[0022] Optionally, the power board test circuit further comprises an alarm circuit, the alarm circuit being connected with the main control circuit.

[0023] The main control circuit is further configured to trigger the alarm circuit to alarm when the output voltage signal meets a preset fault voltage range or when the temperature signal reaches a preset over-temperature threshold.

[0024] Optionally, the power board test circuit further comprises a storage circuit, the storage circuit being connected with the main control circuit.

[0025] The main control circuit is further configured to send the acquired test data to the storage circuit for storage.

[0026] Optionally, the power board test circuit further comprises a wireless communication circuit connected with the master control circuit, and the wireless communication circuit is configured to realize the communication connection between the master control circuit and a terminal.

[0027] Optionally, the power board test circuit further comprises a display module connected with the master control circuit.

[0028] The master control circuit is further configured to send the acquired test data to the display module for display.

[0029] In addition, the application also provides a power board test device comprising the power board test circuit configured as described above.

[0030] The application provides a power board test circuit and a power board test device. The power board is a TV power board comprising a master control circuit. An output end of the master control circuit is configured to access a power board to be tested. The master control circuit is configured to simulate a control signal sent by a main board of the TV to the power board and send the simulated control signal to the power board to be tested, so as to drive the power board to work. Thus, the master control circuit simulates the control signal sent by the main board of the TV, so as to meet the requirement of driving the power board to work. The power board no longer needs to be connected with the main board through wires, and the test is more convenient. Especially when different main boards need to be tested, the master control circuit can simulate the control signals of different main boards, so as to greatly improve the convenience of the test and the test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0032] Figure 1 The figure is a functional module schematic diagram of an embodiment of the power board test circuit of the present application.

[0033] Figure 2 The figure is a functional module schematic diagram of another embodiment of the power board test circuit of the present application.

[0034] Figure 3 The figure is a circuit structure schematic diagram of the first relay circuit in an embodiment of the power board test circuit of the present application.

[0035] Figure 4 The figure is a circuit structure schematic diagram of the second relay circuit in an embodiment of the power board test circuit of the present application.

[0036] Figure 5 Fig. 1 is a schematic diagram of a circuit structure of a wireless communication circuit in an embodiment of a power board test circuit of the present application.

[0037] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0038] Explanation of reference signs:

[0039] Reference Name Reference Name 100 Power panel 70 Temperature sampling circuit 200 Test power input 21 First relay circuit 10 Master control circuit 22 Second relay circuit 20 Switching circuit RL1 First relay 30 Storage circuit RL2 Second relay 40 Input voltage sampling circuit Q1 First switch tube 50 Output voltage sampling circuit Q2 Second switch tube 60 Alarm circuit U1 ESP01 module DETAILED DESCRIPTION

[0040] It should be understood that the specific embodiments described herein merely exemplify the application and do not limit the application.

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0043] In addition, the description of “first”, “second” and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0044] The present application provides a power board test circuit, which is applied to a TV.

[0045] Referring to Figure 1 In an embodiment, the power board test circuit comprises:

[0046] A main control circuit 10, an output end of the main control circuit 10 is used for connecting a power board 100 to be tested;

[0047] The main control circuit 10 is used for sending the control signal from the mainboard of the TV to the power board 100 and sending the simulated control signal to the power board 100 to be tested, so as to drive the power board 100 to work.

[0048] It can be understood that, when the power board 100 is detected, the control signal from the mainboard must be output, so as to simulate the state of the power board 100 in actual work, control the power board 100 to output the corresponding voltage, such as 12V, 5V or 3.3V. Therefore, when the power board 100 is detected, the main control circuit 10 sends the simulated control signal from the mainboard of the TV to the power board 100, so as to drive the power board 100 to work. The main control circuit 10 can be selected according to actual needs, for example, a single-chip microcomputer, which is low in cost and easy to implement.

[0049] Because different TVs have different types of mainboards, the main control circuit 10 can simulate the output of the control signal from any type of mainboard. The timing of the control signal can be variable. Compared with the flying line from the mainboard, the control signal output by the main control circuit 10 can adjust the control time, timing and other control information, and the control is more flexible. It can be used to detect and reproduce timing errors and other problems.

[0050] The control signal also includes a PWM dimming signal. Some power boards 100 are analog dimming, that is, the brightness is changed by changing the voltage and current, so the mainboard also needs to output a PWM dimming signal with adjustable frequency and duty cycle to control the output voltage of the power board 100. The main control circuit 10 can simulate the mainboard to output a PWM signal with adjustable frequency and duty cycle, which can meet the debugging requirements of the power board 100 with analog dimming technology. Thus, the compatibility of different power boards 100 can be improved, so that the trouble of matching the corresponding mainboard of the power board 100 during testing is avoided, the testing convenience is improved, and the efficiency is improved.

[0051] The main control circuit 10 is also used for sending the SPI signal from the mainboard of the TV to the power board 100 and sending the simulated SPI signal to the constant current board in the power board 100 to be tested, so as to drive the constant current board to work. The control signal also includes the SPI signal, so as to detect the power board 100 including the constant current board.

[0052] In the embodiment, the main control circuit 10 is arranged to access the power board 100 to be tested; and the main control circuit 10 is arranged to simulate the control signal sent by the main board of the TV to the power board 100 and send the simulated control signal to the power board 100 to be tested, so as to drive the power board 100 to work. Thus, the main control circuit 10 simulates the control signal sent by the main board of the TV, so as to meet the requirement of driving the power board 100 to work, and the power board 100 and the main board no longer need to be connected through wires, which is more convenient for testing. Especially when different main boards need to be tested, the main control circuit 10 can simulate the control signal of different main boards, so as to greatly improve the convenience of testing and the testing efficiency.

[0053] Further, referring to Figure 2 , the power board testing circuit further comprises:

[0054] a testing power input end 200;

[0055] a switch circuit 20, an input end of the switch circuit 20 being arranged to be connected with the testing power input end 200, and an output end of the switch circuit 20 being arranged to access the power board 100 to be tested;

[0056] the main control circuit 10 is further arranged to send a power-on signal or a power-off signal;

[0057] the switch circuit 20 is arranged to turn on the power board 100 and the testing power when the power-on signal is received, and turn off the power board 100 and the testing power when the power-off signal is received.

[0058] The power to be tested can be a 220V alternating current power, which can be selected according to the power supply requirement of the current board. The switch circuit 20 can be a relay circuit, and the structure of the relay circuit can be arranged according to actual requirements. Referring to Figures 3-4 , the switch circuit 20 can comprise a first relay circuit 21 and a second relay circuit 22, a first end (L_IN) of a normally open contact of a first relay RL1 in the first relay circuit 21 being a live wire input end of the switch circuit 20, a first end (N_IN) of a normally open contact of a second relay RL2 in the second relay circuit 22 being a zero line input end of the switch circuit 20; the first end of the normally open contact of the first relay RL1 and the first end of the normally open contact of the second relay RL2 being arranged to be connected with the live wire and the zero line of the testing power input end 200 respectively; a second end (L_OUT) of the normally open contact of the first relay RL1 and a second end (N_OUT) of the normally open contact of the second relay RL2 being output ends of the switch circuit 20, and being arranged to be connected with the power board 100 to be tested.

[0059] When the switch-on and switch-off test is to be performed, the main control circuit 10 makes the output JDQ1 signal and the JDQ2 signal high level, so that the first switch Q1 in the first relay circuit 21 and the second Q2 in the second relay circuit 22 are turned on, the coils of the first relay RL1 and the second relay RL2 are powered, so that the normally open contacts of the first relay RL1 and the second relay RL2 are closed, the power board 100 under test is connected with the test power input end 200, and the test power supplies power to the power board 100 under test; when the JDQ1 signal and the JDQ2 signal output by the main control circuit 10 are low level, the power board 100 under test is disconnected with the test power input end 200, and the power board 100 under test is powered off.

[0060] The strong voltage such as 220V is controlled by the weak voltage of the main control circuit 10, and the safety is higher. The frequency and the time length of the power-on signal or the power-off signal output by the main control circuit 10 can be adjusted according to the needs, so as to detect the state of the power board 100 under test in different power-on and power-off conditions.

[0061] Further, referring again to Figure 2 , the power board test circuit further comprises a storage circuit 30 connected with the main control circuit 10; the main control circuit 10 is further used for sending the test data acquired to the storage circuit 30 for storage.

[0062] The test data is the test-related data that can be specifically acquired by the main control circuit 10 in the power board 100 test process, for example, the frequency and the time length of the power-on signal or the power-off signal output by the main control circuit 10, the temperature sampling signal received by the main control circuit 10 during temperature detection, the output voltage signal received by the main control circuit 10 during output voltage detection, the input voltage signal value received by the main control circuit 10 during input voltage detection, etc. The time length can include the time length of the switch-on and switch-off test and the time length of the output power-on signal. By recording the test data to the external storage circuit 30, the power-down data is not lost, and the test data can be analyzed later.

[0063] At present, when the switch-on and switch-off test is performed, the switch-on and switch-off impact tester needs to be used, the switch-on and switch-off impact tester is expensive and needs to occupy a certain volume, and is not portable. And the switch-on and switch-off impact tester can only simulate the rapid switch-on and switch-off, and cannot record the detailed data such as switch-on and switch-off time and frequency, which is not convenient for later analysis. In the embodiment, the power board test circuit can set the test time length and the frequency, and can record the test data, so as to facilitate data analysis and reduce the occupied volume.

[0064] Further, the power board test circuit further comprises an input voltage sampling circuit 40, an input end of the input voltage sampling circuit 40 being connected with the test power input end 200, and an output end of the input voltage sampling circuit 40 being connected with the master control circuit 10; the input voltage sampling circuit 40 is used for sampling the power voltage input to the power board 100 from the test power input end, and outputting an input voltage signal; the master control circuit 10 is further used for receiving the input voltage signal, and outputting the power-on signal with a preset frequency and / or a preset time length according to the input voltage signal.

[0065] The power board 100 on-off detection is specifically: in the state of the power board 100 being continuously powered on and powered off, the output power of the power device on the power board 100 is detected by using a power detection device, and the power board 100 is started at the peak value of 220V alternating current, so that the voltage applied to the power device is maximum, and the current applied to the power device is also maximum, because if the power board 100 can be started at the peak value of 220V alternating current, the stress of the power device can be better detected.

[0066] The conventional on-off test instrument cannot detect the phase of 220V alternating current, and cannot control when to start and stop. In the embodiment, the power-on signal with a preset frequency and / or a preset time length is output according to the phase of the input voltage signal, specifically, the power-on signal with a preset frequency and / or a preset time length is output according to the phase of the input voltage signal, so that the master control circuit 10 can control the on-off circuit 20 to start and stop at the peak value of the alternating current of the test power, to facilitate the debugging of special requirements.

[0067] Further, the power board test circuit further comprises an output voltage sampling circuit 50, an input end of the output voltage sampling circuit 50 being connected with the output end of the power board 100, and an output end of the output voltage sampling circuit 50 being connected with the master control circuit 10; the output voltage sampling circuit 50 is used for sampling the output voltage of the power board 100, and outputting a corresponding output voltage signal; the master control circuit 10 is further used for determining whether the power board 100 under test has a power failure according to the output voltage signal.

[0068] At present, there is no power failure detector in the TV industry, and the output voltage output by the power board 100 can only be measured by using an oscilloscope to capture the power failure signal. However, when the output voltage is abnormal, such as not reaching a preset output range or a power failure occurs, the oscilloscope cannot automatically record, and a tester needs to be present at the test site. Moreover, the oscilloscope occupies a large space, and some places that do not have high requirements for signals do not need to use the oscilloscope.

[0069] In the embodiment, the voltage at the output end of the power board 100 can be sampled by the output voltage sampling circuit 50, and the main control circuit 10 processes the voltage to identify whether the output voltage is abnormal, thereby achieving the detection of the output voltage, which is more space-saving and portable than an oscilloscope. In addition, the main control circuit 10 can send the output voltage to the storage circuit 30 to record the voltage change data, so that the test data such as the power-off time can be recorded, and the test data can be analyzed by professionals.

[0070] It should be noted that the structures of the input voltage sampling circuit 40 and the output voltage sampling circuit 50 are not limited, and those skilled in the art can set them according to common techniques in the art, as long as the corresponding functions are achieved.

[0071] Further, the power board test circuit further comprises a temperature sampling circuit 70; the output end of the temperature sampling circuit 70 is connected with the main control circuit; the temperature sampling circuit 70 is used for detecting the temperature of the power board 100 and outputting a corresponding temperature signal; and the main control circuit 10 is further used for receiving the temperature signal and determining whether the power board 100 under test has an over-temperature fault according to the temperature signal.

[0072] At present, the temperature rise of the power board 100 in the TV power supply industry is mainly tested by an infrared temperature measuring gun, which is expensive and cannot record the temperature change curve in real time.

[0073] In the embodiment, the temperature sampling circuit 70 can comprise a thermistor, which is used to collect the real-time temperature of the power board 100. Since the resistance of the thermistor changes with temperature, when the temperature changes, the resistance of the thermistor also changes. The main control circuit 10 can collect the voltage division on the thermistor to calculate the current temperature, thereby achieving the purpose of collecting voltage and saving manpower for temperature measurement by hand.

[0074] The main control circuit 10 can also record the temperature test data in the external storage circuit 30, which can record the temperature data in real time and does not lose the data in power failure, thereby facilitating the analysis of the temperature characteristics of the power device.

[0075] Further, the power board test circuit further comprises an alarm circuit 60, which is connected with the main control circuit 10; and the main control circuit 10 is further used for triggering the alarm circuit 60 to alarm when the output voltage signal meets a preset fault voltage range, or when the temperature signal reaches a preset over-temperature threshold.

[0076] The preset fault voltage range can be outside the normal voltage range. It can be understood that the output voltage has a normal voltage range, such as 12V output. According to the actual accuracy requirement, the output between 11.5V-12.5V can be considered within the normal range. Therefore, exceeding 12.5V or being lower than 11.5V is considered as the fault voltage range. In combination with the test power-off requirement, a power-off voltage threshold can also be set. When the output voltage is lower than the power-off voltage threshold, it is considered as power-off. The main control circuit 10 can record this and trigger the alarm circuit 60 to alarm, thereby protecting the power board 100 safe.

[0077] The main control circuit 10 also has an over-temperature threshold. When the temperature exceeds the over-temperature threshold, the power board 100 has the risk of loss. At this time, the main control circuit 10 can record this and trigger the alarm circuit 60 to alarm, thereby protecting the power board 100 safe.

[0078] Further, the power board test circuit also includes a display module (not output), which is connected with the main control circuit 10. The main control circuit 10 is also used to send the acquired test data to the display module for display.

[0079] The test data includes the frequency and time length of the power-on signal or power-off signal output by the main control circuit 10, the temperature sampling signal received by the main control circuit 10, the output voltage signal, the input voltage signal value, etc. Through the display module, the test data can be displayed in real time, so that the tester can know the test situation in time. The main control circuit 10 can also draw corresponding statistical charts according to these test data, which is convenient for more intuitive display.

[0080] Further, the power board test circuit can also include an input module (not shown), which is connected with the main control circuit 10. The input module is used to receive test instructions such as test functions and test parameters. The main control circuit 10 is also used to execute corresponding test operations according to the test instructions.

[0081] Specifically, the test function instruction can be the output of the start / close control signal function, the start / close switch test function, the start / close temperature detection function, and the start / close output voltage detection function. Each detection function can be started simultaneously or individually.

[0082] When the control signal output function is started, the output time and output time sequence of the control signal can be specifically input as test parameters. When the switch test function is started, the time and frequency of the switch can be specifically input as test parameters. When the output voltage detection function is started, test parameters such as fault voltage range that affect output voltage test can be specifically input. When the temperature detection function is started, test parameters such as over-temperature threshold that affect temperature test can be specifically input.

[0083] The display module and the input module can select a set of interactive screens to meet the display requirements and the input requirements.

[0084] Further, the power board test circuit further comprises a wireless communication circuit (not shown) connected with the master control circuit 10, and the wireless communication circuit is used to realize the communication connection between the master control circuit 10 and a terminal.

[0085] The terminal comprises a mobile phone, a tablet computer, a computer and the like. Figure 4 The wireless communication circuit can comprise an ESP01-WIFI module U1, and the ESP01 module U1 can perform serial communication with the master control circuit 10 through RX pins and TX pins.

[0086] By arranging the wireless communication circuit, the test data can be transmitted to a remote terminal, and an operator does not need to go to a test site, but can view temperature, on-off test, power failure and other data at a remote place, so that the operator does not need to frequently walk and manpower is saved.

[0087] In summary, based on the above hardware structure, full-function detection of on-off test, temperature detection, output voltage detection (including power failure detection) and the like of the power board 100 can be realized, the detection data is recorded to facilitate analysis of the detection, remote operation is also possible, and the test efficiency is greatly improved.

[0088] The application also provides a power board test device comprising the power board test circuit, and the structure of the power board test circuit can refer to the above embodiment, which will not be repeated here.

[0089] The above is only an optional embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent flow transformation obtained by using the content of the specification and the drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. A power board test circuit, the power board being applied to a TV, characterized by, The power board test circuit comprises: a main control circuit, an output end of the main control circuit being used for accessing a to-be-tested power board; the main control circuit is used for simulating a control signal sent by a main board of a TV to the to-be-tested power board and sending the simulated control signal to the to-be-tested power board, so as to drive the to-be-tested power board to work; a test power input end; a switch circuit, an input end of the switch circuit being connected with the test power input end, and an output end of the switch circuit being used for accessing the to-be-tested power board; the main control circuit is further used for sending a power-on signal or a power-off signal; the switch circuit is used for turning on the to-be-tested power board and the test power when the power-on signal is received, and turning off the to-be-tested power board and the test power when the power-off signal is received; an input voltage sampling circuit, an input end of the input voltage sampling circuit being connected with the test power input end, and an output end of the input voltage sampling circuit being connected with the main control circuit; the input voltage sampling circuit is used for sampling a power voltage input by the test power to the to-be-tested power board and outputting an input voltage signal; the main control circuit is used for outputting a power-on signal of a preset frequency and / or a preset time length according to a phase of the input voltage signal, so as to control the switch circuit to be turned on at an alternating current peak value of the test power; wherein the main control circuit supports outputting a control signal of any type of main board, the control signal has variable timing, the control signal further comprises a PWM dimming signal and an SPI signal, and the main control circuit supports adjusting a duty cycle of the PWM dimming signal; the power board test circuit further comprises an input module, the input module being connected with the main control circuit; the input module is used for receiving a test instruction, and the main control circuit is further used for performing a corresponding test operation according to the test instruction; the test instruction is an opening or closing control signal output function, an opening or closing switch test function, an opening or closing temperature detection function, or an opening or closing output voltage detection function, and each detection function supports being turned on at the same time; when the control signal output function is turned on, the main control circuit receives an output time and an output timing of the control signal from the input module; when the switch test function is turned on, the main control circuit receives a time and a frequency of the switch from the input module; when the output voltage detection function is turned on, the main control circuit receives a fault voltage range from the input module; and when the temperature detection function is turned on, the main control circuit receives an over-temperature threshold parameter from the input module.

2. The power panel test circuit of claim 1, wherein, the power board test circuit further comprises an output voltage sampling circuit, an input end of the output voltage sampling circuit being connected with an output end of the to-be-tested power board, and an output end of the output voltage sampling circuit being connected with the main control circuit; the output voltage sampling circuit is used for sampling an output voltage of the to-be-tested power board and outputting a corresponding output voltage signal; the main control circuit is further used for determining whether a power failure fault occurs in the to-be-tested power board according to the output voltage signal.

3. The power panel test circuit of claim 1, wherein, the power board test circuit further comprises a temperature sampling circuit, and an output end of the temperature sampling circuit being connected with the main control circuit; The temperature sampling circuit is configured to detect the temperature of the power board under test and output a corresponding temperature signal. The main control circuit is further configured to receive the temperature signal and determine whether the power board under test has an over-temperature fault based on the temperature signal.

4. The power board test circuit of any one of claims 2 or 3, wherein, The power board test circuit further comprises an alarm circuit connected to the main control circuit. The main control circuit is further configured to trigger the alarm circuit to alarm when the output voltage signal of the power board test circuit meets a preset fault voltage range and / or when the temperature signal of the power board test circuit reaches a preset over-temperature threshold.

5. The power board test circuit of any one of claims 1 to 4, wherein, The power board test circuit further comprises a storage circuit connected to the main control circuit. The main control circuit is further configured to send the acquired test data to the storage circuit for storage.

6. The power panel test circuit of claim 5, wherein, The power board test circuit further comprises a wireless communication circuit connected to the main control circuit, and the wireless communication circuit is configured to realize communication connection between the main control circuit and a terminal.

7. The power board test circuit of any one of claims 1 to 4, wherein, The power board test circuit further comprises a display module connected to the main control circuit. The main control circuit is further configured to send the acquired test data to the display module for display.

8. A power board testing apparatus characterised by, A power board test circuit is provided, which is configured as the power board test circuit according to any one of claims 1-7.

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