Power range board test circuit and apparatus

Abstract

The utility model relates to power range board piece test circuit and device, its circuit includes: for output power supply's power unit, connect power unit for connecting power range board piece and monitor power supply's power monitoring unit, for connecting power range board piece, receive current control signal and output test current to power range board piece's adjustable current source, for connecting power range board piece to gather its feedback signal that exports after being input test current's feedback unit, with adjustable current source and feedback unit connection for output current control signal, receive feedback signal and output test result's control unit, with control unit connection for output test result to display terminal's communication unit. The utility model can improve power range board piece's test efficiency and save nuclear power plant human resources.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant technology, and in particular to a power range board testing circuit and device. Background Technology

[0002] Nuclear power plants need to periodically test the power range plates in their external neutron measurement systems to ensure they are functioning correctly. Current testing methods involve manually operating four to five specialized testing tools on-site to test the power range plates, including manually adjusting the outputs of various devices and visually inspecting readings. This requires the coordination of multiple personnel, is extremely time-consuming and labor-intensive, and can potentially delay major overhaul schedules. Therefore, nuclear power plants urgently need a solution that can improve the efficiency of power range plate testing. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a power range board testing circuit and device.

[0004] The technical solution adopted by this utility model to solve its technical problem is: constructing a power range board test circuit, including:

[0005] A power supply unit used for outputting power;

[0006] The power supply unit is connected to the power range board and the power monitoring unit is used to monitor the power supply.

[0007] An adjustable current source for connecting to the power range board, receiving current control signals, and outputting test current to the power range board.

[0008] A feedback unit for connecting the power range board to acquire the feedback signal output after the test current is input.

[0009] A control unit connected to the adjustable current source and feedback unit for outputting the current control signal, receiving the feedback signal, and outputting test results;

[0010] A communication unit connected to the control unit for outputting the test results to the display terminal.

[0011] Preferably, the adjustable current source includes an amplification unit, a resistive unit, a voltage follower, and an output control switch;

[0012] The input terminal of the amplification unit is connected to the control unit, and the output terminal of the amplification unit is connected to the voltage follower via the resistive unit. The voltage follower is also connected to the feedback terminal of the amplification unit. The node after the resistive unit and the voltage follower are connected to the power range board via the output control switch. The output control switch is connected to the control unit.

[0013] The amplification unit, resistive unit, and voltage follower work together to output a test current to the output control switch according to the magnitude of the current control signal. The output control switch is used to control the on / off connection between the resistive unit and the power range board.

[0014] Preferably, the amplification unit includes a first operational amplifier, a first resistor R1, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. One non-inverting input of the first operational amplifier is connected to the control unit via the first resistor R1, and the other is connected to the voltage follower via the third resistor R3. One inverting input of the first operational amplifier is grounded via the fourth resistor R4, and the other is connected to the output of the first operational amplifier via the fifth resistor R5.

[0015] The resistive unit includes a sixth resistor R6, the first end of which is connected to the output terminal of the first operational amplifier, and the second end of which is connected to the output control switch.

[0016] The voltage follower includes a second operational amplifier, the non-inverting input of which is connected to the second terminal of the sixth resistor R6, and the inverting input of which is connected to the third resistor R3 and the output of the second operational amplifier.

[0017] Preferably, the output control switch includes a slide switch SW5, the fixed contact of the slide switch SW5 is connected to the node after the resistive unit and the voltage follower are connected, the first moving contact of the slide switch SW5 is used to connect to the power range board, and the second moving contact of the slide switch SW5 is grounded.

[0018] Preferably, the adjustable current source further includes a coaxial cable connector CON6, and the adjustable current source is connected to the power range board through the coaxial cable connector CON6 and the coaxial cable.

[0019] Preferably, the feedback unit includes an analog-to-digital conversion unit and a level conversion unit;

[0020] The analog-to-digital conversion unit is connected between the control unit and the power range board. The analog-to-digital conversion unit is used to convert the analog signal output by the power range board into a digital signal and feed the digital signal back to the control unit.

[0021] The level conversion unit is connected between the control unit and the power range board. The level conversion unit is used to step down the switching signal output by the power range board and feed the converted switching signal back to the control unit.

[0022] Preferably, the communication unit includes an Ethernet communication module.

[0023] Preferably, the power supply unit includes a first voltage conversion unit, a second voltage conversion unit, and a third voltage conversion unit;

[0024] The first voltage conversion unit is used to convert mains power into a first DC voltage and supply power to the power range board through the first DC voltage;

[0025] The second voltage conversion unit is connected to the first voltage conversion unit, the adjustable current source and the feedback unit. The second voltage conversion unit is used to convert the first DC voltage and supply power to the adjustable current source and the feedback unit through the converted voltage.

[0026] The third voltage conversion unit is connected to the first voltage conversion unit, the control unit, and the communication unit. The third voltage conversion unit is used to convert the first DC voltage into a second DC voltage and to supply power to the control unit and the communication unit through the first voltage conversion unit.

[0027] Preferably, the third voltage conversion unit includes a switching power supply and a linear power supply;

[0028] The first voltage conversion unit is connected to the switching power supply, and the linear power supply is connected to the switching power supply, the control unit, and the communication unit.

[0029] This utility model also constructs a power range board testing device, including a housing, and the power range board testing circuit described above is provided inside the housing.

[0030] The present invention has the following advantages: it provides a power range board test circuit, which integrates the hardware circuit required for testing the power range board function, reduces the size of the equipment and achieves lightweight processing, and uses the control unit as the main control device to realize data transmission between units, which significantly reduces the testing workload, effectively improves the testing efficiency of the power range board, saves nuclear power plant human resources, and shortens the overhaul period. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0032] Figure 1 This is a circuit structure block diagram of the power range board test circuit in some embodiments of this utility model;

[0033] Figure 2 This is a circuit structure block diagram of the power supply unit in some embodiments of this utility model;

[0034] Figure 3This is a circuit structure block diagram of the third voltage conversion unit in some embodiments of this utility model;

[0035] Figure 4 This is a circuit diagram of a switching power supply in some embodiments of this utility model;

[0036] Figure 5 This is a circuit diagram of a linear power supply in some embodiments of this utility model;

[0037] Figure 6 This is a circuit diagram of the amplification unit in some embodiments of this utility model;

[0038] Figure 7 This is a circuit diagram of the communication unit in some embodiments of this utility model. Detailed Implementation

[0039] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0040] Figure 1 This is a circuit structure block diagram of a power range board test circuit in some embodiments of this utility model. The test circuit may include a power supply unit 1, a power supply monitoring unit 2, an adjustable current source 3, a feedback unit 4, a control unit 5, and a communication unit 6.

[0041] Power supply unit 1 is used to output power.

[0042] Because the control unit 5 and communication unit 6 used for control and data processing in the test circuit operate at low voltages (usually no more than 5V), while the power range board typically operates at 24V, the related hardware circuits (including the adjustable current source 3 and feedback unit 4) operate at higher voltages. Therefore, this invention requires multiple DC voltage power supplies. Accordingly, such as... Figure 2 As shown, the power supply unit 1 may include a first voltage conversion unit 11, a second voltage conversion unit 12, and a third voltage conversion unit 13.

[0043] like Figure 2As shown, the first voltage conversion unit 11 is used to convert AC mains power into a first DC voltage, and then uses this first DC voltage to power the power range board. Specifically, the first voltage conversion unit 11 can include an existing ACDC switching power supply capable of converting 220VAC AC mains power into a first DC voltage with a nominal voltage of 24V. Furthermore, the first DC voltage is used not only to power the second voltage conversion unit 12 and the third voltage conversion unit 13, but also to fix the power range board. Therefore, the power monitoring unit 2 can be connected to the output terminal of the first voltage conversion unit 11 to monitor the actual value of the first DC voltage output by the first voltage conversion unit 11, as well as the output current of the first voltage conversion unit 11, and can calculate the output power of the first voltage conversion unit 11 based on the actual value of the first DC voltage and the output current.

[0044] like Figure 2 As shown, the second voltage conversion unit 12 is connected to the first voltage conversion unit 11, the adjustable current source 3, and the feedback unit 4. The second voltage conversion unit 12 is used to convert the first DC voltage and supply power to the adjustable current source 3 and the feedback unit 4 through the converted voltage. Specifically, the first voltage conversion unit 11 can include an existing DC-DC switching power supply, which can convert 24V DC voltage into a second DC voltage with a nominal voltage of 15V.

[0045] like Figure 2 As shown, the third voltage conversion unit 13 is connected to the first voltage conversion unit 11, the control unit 5 and the communication unit 6. The third voltage conversion unit 13 is used to convert the first DC voltage into the second DC voltage and to supply power to the control unit 5 and the communication unit 6 through the first voltage conversion unit 11.

[0046] In some embodiments, the third voltage conversion unit 13 may include, for example, Figure 3 The diagram shows a switching power supply 131 and a linear power supply 132. A first voltage conversion unit 11 is connected to the switching power supply 131, and the linear power supply 132 is connected to the switching power supply 131, the control unit 5, and the communication unit 6. The switching power supply 131 converts a first DC voltage to a third DC voltage of 5V, while the linear power supply 132 converts the third DC voltage to a fourth DC voltage of 3.3V. This fourth DC voltage powers the control unit 5 and the communication unit 6. It should be noted that first stepping down the first DC voltage using the switching power supply 131 improves power efficiency, while using the linear power supply 132 to convert the third DC voltage to the fourth DC voltage utilizes the low ripple and stable voltage characteristics of the linear power supply 132, which helps improve the operational stability of the control unit 5 and the communication unit 6.

[0047] In some embodiments, such as Figure 4As shown, the switching power supply 131 may include a switching control chip U2, an eleventh capacitor C11, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a diode D4, an inductor L5, a sixteenth resistor R16, a nineteenth resistor R19, a seventeenth capacitor C17, an eighteenth capacitor C18, a first ferrite bead B1, a twenty-second capacitor C22, and a twenty-third capacitor C23.

[0048] Specifically, the power supply terminal of the switch control chip U2 is connected to the first voltage conversion unit 11 to receive the first DC voltage DC24V. The power supply terminal of the switch control chip U2 is also grounded via the eleventh capacitor C11, which serves a decoupling function. The power supply terminal of the switch control chip U2 is also connected to the enable terminal of the switch control chip U2 via the eleventh resistor R11, and the enable terminal of the switch control chip U2 is also grounded via the twelfth resistor R12. The timing setting terminal of the switch control chip U2 is grounded via the thirteenth resistor R13. The error compensation terminal of the switch control chip U2 is grounded via two paths: one through the fourteenth resistor R14 and the fourteenth capacitor C14, and the other through the fifteenth capacitor C15. The bootstrap capacitor connection terminal of the switch control chip U2 is grounded via the sixteenth capacitor C16 and the diode D4. The switch control terminal of the switch control chip U2 is connected to the first terminal of the inductor L5. The second terminal of inductor L5 is grounded via resistors R16 and R19. The node formed by the connection of resistors R16 and R19 is connected to the feedback terminal of switch control chip U2. Capacitor C17 is connected in parallel with resistor R16. The second terminal of inductor L5 is also grounded via capacitor C18 and connected to the first terminal of ferrite bead B1. Capacitor C18 and ferrite bead B1 act as filters to remove high-frequency noise superimposed on the output voltage of the second terminal of inductor L5. The second terminal of ferrite bead B1 is connected to control unit 5 and communication unit 6 (not shown) and grounded via capacitor C22. Capacitor C22 can be an electrolytic capacitor, which can reduce the ripple of the third DC voltage. Capacitor C23 is connected in parallel with capacitor C22 to further filter out high-frequency noise in the third DC voltage.

[0049] In this embodiment, the switch control chip U2 can be a TPS54560. The working principle of the switching power supply 131 can be found in existing technology and will not be described in detail here.

[0050] In addition, such as Figure 4 As shown, the switching power supply 131 may also include a twelfth capacitor C12, a nineteenth capacitor C19, a twentieth capacitor C20, and a twenty-first capacitor C21. These capacitors further enhance the filtering effect on their respective lines. For their specific connection structure, please refer to [reference needed]. Figure 4 This will not be elaborated upon here.

[0051] In some embodiments, such as Figure 5 As shown, the linear power supply 132 may include a linear regulator U3, a thirty-first capacitor C31, a second ferrite bead B2, a thirty-second capacitor C32, a thirty-third capacitor C33, a thirty-first resistor R31, and an LED D6. The linear regulator U3 may be an AZ1117-3.3 model.

[0052] Specifically, the power supply terminal of the linear regulator U3 is connected to the first terminal of the first ferrite bead B1. The power supply terminal of the linear regulator U3 is also grounded through the thirty-first capacitor C31, which serves as a decoupling capacitor. The output terminal of the linear regulator U3 is connected to the first terminal of the second ferrite bead B2, and the second terminal of the second ferrite bead B2 is used to output the third DC voltage. The second terminal of the second ferrite bead B2 is also grounded through the thirty-second capacitor C32. The thirty-third capacitor C33 is connected in parallel with the thirty-second capacitor C32, and the thirty-third capacitor C33 and the thirty-second capacitor C32 serve as a decoupling capacitor. The second terminal of the second ferrite bead B2 is also grounded through the thirty-first resistor R31 and the LED D6. The LED D6 is used to indicate whether the third DC voltage is output normally, and the thirty-first resistor R31 serves as a current limiter.

[0053] Power monitoring unit 2 is connected to power unit 1. Power monitoring unit 2 is used to connect to the power range board and monitor the power supply. Specifically, power monitoring unit 2 is used to disconnect the output of power unit 1 when there is an overcurrent or overvoltage, thereby protecting its downstream circuitry.

[0054] In some embodiments, the power monitoring unit 2 is also used to monitor the output current, output voltage, and output power of the power supply. Correspondingly, the control unit 5 can also cooperate with the power monitoring unit to monitor whether the output of the power supply is normal, so that when an abnormality is detected in the power supply, an alarm signal is output to prompt the staff to terminate the test, thereby avoiding damage to the power range board.

[0055] In the first embodiment, the power monitoring unit 2 may include a current transformer and a voltage transformer, which are respectively mounted on the output cable of the first voltage conversion unit 11 to monitor its output voltage and output current.

[0056] In the second embodiment, the power monitoring unit 2 may include a current sampling resistor and a voltage divider circuit. The current sampling resistor is connected in series with the output cable of the first voltage conversion unit 11, and its two ends are also connected to the control unit 5, so that the control unit 5 can determine the output current of the first voltage conversion unit 11 based on the voltage across the current sampling resistor. The voltage divider circuit is connected to the first voltage conversion unit 11 and is used to divide the output voltage of the first voltage conversion unit 11, and send the divided voltage to the control unit 5, so that the control unit 5 can know the magnitude of the output voltage of the first voltage conversion unit 11.

[0057] The adjustable current source 3 is used to connect to the power range board, receive the current control signal, and output the test current to the power range board. The current control signal is used to control the magnitude of the test current.

[0058] In some embodiments, such as Figure 6 As shown, the adjustable current source 3 may include an amplification unit 31, a resistive unit 32, a voltage follower 33, and an output control switch 34. The input terminal of the amplification unit 31 is connected to the control unit 5, and the output terminal of the amplification unit 31 is connected to the voltage follower 33 via the resistive unit 32. The voltage follower 33 is also connected to the feedback terminal of the amplification unit 31. The node after the resistive unit 32 and the voltage follower 33 are connected is also connected to the power range board via the output control switch 34. The output control switch 34 is connected to the control unit 5. The amplification unit 31, the resistive unit 32, and the voltage follower 33 cooperate to output a test current to the output control switch 34 according to the magnitude of the current control signal. The output control switch 34 is used to control the on / off connection between the resistive unit 32 and the power range board.

[0059] In some embodiments, such as Figure 6 As shown, the amplification unit 31 may include a first operational amplifier 311, a first resistor R1, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. One non-inverting input of the first operational amplifier 311 is connected to the control unit 5 via the first resistor R1, and the other is connected to the voltage follower 33 via the third resistor R3. One inverting input of the first operational amplifier 311 is grounded via the fourth resistor R4, and the other is connected to the output of the first operational amplifier 311 via the fifth resistor R5. It should be noted that the end of the first resistor R1 connected to the control unit 5 corresponds to the input of the amplification unit 31, the end of the third resistor R3 connected to the voltage follower 33 corresponds to the feedback of the amplification unit 31, and the output of the first operational amplifier 311 corresponds to the output of the amplification unit 31.

[0060] In some embodiments, such as Figure 6As shown, resistive unit 32 may include a sixth resistor R6. The first end of the sixth resistor R6 is connected to the output terminal of the first operational amplifier 311, and the second end of the sixth resistor R6 is connected to the output control switch 34. Furthermore, the second end of the sixth resistor R6 is used to output the aforementioned test current.

[0061] In some embodiments, such as Figure 6 As shown, the voltage follower 33 may include a second operational amplifier 331. The non-inverting input of the second operational amplifier 331 is connected to the second terminal of the sixth resistor R6, and the inverting input of the second operational amplifier 331 is connected to the third resistor R3 and the output of the second operational amplifier 331.

[0062] Please see Figure 6 The working principle of the adjustable current source 3 is as follows: The control unit 5 outputs a current control signal (i.e., signal DAC_CH4) to the first resistor R1 in the amplification unit 31. The amplification unit 31 is a non-inverting amplifier circuit, and the amplified voltage is input to the first terminal of the sixth resistor R6. The voltage at the second terminal of the sixth resistor R6 is fed back to the feedback terminal of the amplification unit 31 after passing through the voltage follower 33, so that a stable voltage drop is formed across the six resistor R6. This voltage drop is determined by the magnitude of the signal DAC_CH4. Since the input impedance of the voltage follower 33 is very large, the current input to the non-inverting input terminal of the second operational amplifier 331 can be ignored. That is to say, the current flowing through the sixth resistor R6 can be regarded as the test current. Therefore, the control unit 5 can control the magnitude of the test current by controlling the voltage value of the control signal DAC_CH4.

[0063] In some embodiments, the first operational amplifier 311 and the second operational amplifier 331 may correspond to two operational amplifiers in existing integrated operational amplifiers. For example... Figure 6 As shown, the integrated operational amplifier U20 can be model ADA4004-2ARZ.

[0064] In some embodiments, such as Figure 6 As shown, the output control switch 34 may include a slide switch SW5. The slide switch SW5 may be an MSK12CO2. The fixed contact of the slide switch SW5 is connected to the node where the resistive unit 32 and the voltage follower 33 are connected. The first moving contact of the slide switch SW5 is used to connect to the power range board, and the second moving contact of the slide switch SW5 is grounded. Understandably, the operator can control whether the test current is output to the power range board by operating the slide switch SW5.

[0065] To avoid noise interference with the test current, in some embodiments, the adjustable current source 3 may further include a coaxial connector CON6. The coaxial connector CON6 may be of model MCX-KHD. The adjustable current source 3 is connected to the power range board via the coaxial connector CON6 and a coaxial cable. This embodiment can improve the stability of the test current.

[0066] In some embodiments, such as Figure 6 As shown, the adjustable current source 3 may also include a seventh resistor R7, which is connected in series between the sixth resistor R6 and the fixed contact of the slide switch SW5. The seventh resistor R7 serves as a matching impedance.

[0067] Feedback unit 4 is used to connect to the power range board to collect the feedback signal output after the input test current. The feedback signal includes both analog and digital signals output by the power range board when measuring the test current. The analog signal characterizes the neutron fluence rate, while the digital signal characterizes various alarm and warning messages.

[0068] In some embodiments, the feedback unit 4 includes an analog-to-digital converter (ADC) and a level conversion unit. The ADC is connected between the control unit 5 and the power range board. The ADC converts the analog signal output from the power range board into a digital signal and feeds the digital signal back to the control unit 5 for recognition. The ADC can include existing ADC circuits, as long as they can perform analog-to-digital conversion; no limitation is made here.

[0069] The level conversion unit is connected between the control unit 5 and the power range board. The level conversion unit is used to step down the switching signal output from the power range board and feed the converted switching signal back to the control unit 5, enabling the control unit 5 to receive relevant alarm and warning information. The level conversion unit can include existing level conversion circuits, as long as they can convert high-voltage communication levels to low-voltage communication levels (e.g., converting 0V to 15V communication levels to 0V to 3.3V communication levels). No specific limitations are imposed here.

[0070] The control unit 5 is connected to the adjustable current source 3 and the feedback unit 4 to output current control signals, receive feedback signals and output test results.

[0071] In some embodiments, the control unit 5 may include a microprocessor of model STM32F407 for data management.

[0072] Communication unit 6 is connected to control unit 5 and is used to output test results to display terminal. Test results may include a comparison between feedback signals and / or analog signals and preset analog quantities. It should be noted that the preset analog quantity is determined by the test current. Specifically, the relationship between the input current of the power range board and its theoretical output analog signal can be obtained by consulting the power range board's datasheet. Substituting the test current into the relationship yields the preset analog quantity.

[0073] In some embodiments, the communication unit 6 may include an existing Ethernet communication module.

[0074] Furthermore, such as Figure 7 As shown, communication unit 6 may include network communication chip U4 and related peripheral electronic components (including resistors R71 to R75, resistor R77, resistor R78, capacitors C46 to C53, etc.). The network communication chip U4 may be a QCA9531. For the connection relationship between network communication chip U4 and related peripheral electronic components, please refer to [reference needed]. Figure 7 This will not be elaborated upon here.

[0075] In some embodiments, the power range board test circuit may further include an operation panel, which may consist of multiple buttons. The operation panel is connected to the control unit 5 and is used to control the operation of the control unit 5 according to the operator's operation, including controlling the magnitude of the current control signal, etc.

[0076] This utility model also provides a power range board testing device, including a housing, wherein the power range board testing circuit provided in the embodiment of this utility model is disposed inside the housing.

[0077] Understandably, this utility model integrates the hardware circuitry required for the power range test board. Compared with the prior art, it not only reduces the size of the equipment but also achieves lightweighting. Furthermore, by using the control unit as the main control device to realize data transmission between units, it significantly reduces the testing workload, effectively improves the testing efficiency of the power range test board, saves manpower in nuclear power plants, and shortens the overhaul period.

[0078] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A power range board test circuit, characterized in that, include: A power supply unit used for outputting power; The power supply unit is connected to the power range board and the power monitoring unit is used to monitor the power supply. An adjustable current source for connecting to the power range board, receiving current control signals, and outputting test current to the power range board. A feedback unit for connecting the power range board to acquire the feedback signal output after the test current is input. A control unit connected to the adjustable current source and feedback unit for outputting the current control signal, receiving the feedback signal, and outputting test results; A communication unit connected to the control unit for outputting the test results to the display terminal.

2. The power range board test circuit according to claim 1, characterized in that, The adjustable current source includes an amplification unit, a resistive unit, a voltage follower, and an output control switch; The input terminal of the amplification unit is connected to the control unit, and the output terminal of the amplification unit is connected to the voltage follower via the resistive unit. The voltage follower is also connected to the feedback terminal of the amplification unit. The node after the resistive unit and the voltage follower are connected to the power range board via the output control switch. The output control switch is connected to the control unit. The amplification unit, resistive unit, and voltage follower work together to output a test current to the output control switch according to the magnitude of the current control signal. The output control switch is used to control the on / off connection between the resistive unit and the power range board.

3. The power range board test circuit according to claim 2, characterized in that, The amplification unit includes a first operational amplifier, a first resistor R1, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. One of the non-inverting input terminals of the first operational amplifier is connected to the control unit via the first resistor R1, and the other is connected to the voltage follower via the third resistor R3. One of the inverting input terminals of the first operational amplifier is grounded via the fourth resistor R4, and the other is connected to the output terminal of the first operational amplifier via the fifth resistor R5. The resistive unit includes a sixth resistor R6, the first end of which is connected to the output terminal of the first operational amplifier, and the second end of which is connected to the output control switch. The voltage follower includes a second operational amplifier, the non-inverting input of which is connected to the second terminal of the sixth resistor R6, and the inverting input of which is connected to the third resistor R3 and the output of the second operational amplifier.

4. The power range board test circuit according to claim 2, characterized in that, The output control switch includes a slide switch SW5. The fixed contact of the slide switch SW5 is connected to the node after the resistive unit and the voltage follower are connected. The first moving contact of the slide switch SW5 is used to connect to the power range board, and the second moving contact of the slide switch SW5 is grounded.

5. The power range board test circuit according to any one of claims 1 to 4, characterized in that, The adjustable current source also includes a coaxial cable connector CON6, and the adjustable current source is connected to the power range board through the coaxial cable connector CON6 and the coaxial cable.

6. The power range board test circuit according to claim 1, characterized in that, The feedback unit includes an analog-to-digital conversion unit and a level conversion unit; The analog-to-digital conversion unit is connected between the control unit and the power range board. The analog-to-digital conversion unit is used to convert the analog signal output by the power range board into a digital signal and feed the digital signal back to the control unit. The level conversion unit is connected between the control unit and the power range board. The level conversion unit is used to step down the switching signal output by the power range board and feed the converted switching signal back to the control unit.

7. The power range board test circuit according to claim 1, characterized in that, The communication unit includes an Ethernet communication module.

8. The power range board test circuit according to claim 1, characterized in that, The power supply unit includes a first voltage conversion unit, a second voltage conversion unit, and a third voltage conversion unit; The first voltage conversion unit is used to convert mains power into a first DC voltage and supply power to the power range board through the first DC voltage; The second voltage conversion unit is connected to the first voltage conversion unit, the adjustable current source and the feedback unit. The second voltage conversion unit is used to convert the first DC voltage and supply power to the adjustable current source and the feedback unit through the converted voltage. The third voltage conversion unit is connected to the first voltage conversion unit, the control unit, and the communication unit. The third voltage conversion unit is used to convert the first DC voltage into a second DC voltage and to supply power to the control unit and the communication unit through the first voltage conversion unit.

9. The power range board test circuit according to claim 8, characterized in that, The third voltage conversion unit includes a switching power supply and a linear power supply; The first voltage conversion unit is connected to the switching power supply, and the linear power supply is connected to the switching power supply, the control unit, and the communication unit.

10. A power range plate testing device, characterized in that, It includes a housing, and the housing is provided with a power range board test circuit as described in any one of claims 1 to 9.

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