Contact resistance tester circuit based on high frequency electronics
Patent Information
- Application Number
- CN202522053964.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-24
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-09-24
AI Technical Summary
[0003]目前，微阻抗测量主要有电桥测量方法、直流电阻测量法与工频阻抗测量法；在检测过程中，电桥测量方法容易受到较强的工频信号干扰，这会导致测量结果产生较大误差，影响测量的准确性；直流电阻测量法实现大容量低压直流电源较为困难，而且直流阻抗测量装置价格相对昂贵，同时体积和重量较大，不便携带和操作；工频阻抗测量法虽然检测结果较为准确，但使用工频隔离变压器完成被测试件与电源的隔离，整体设备在便携性、体积和成本等方面仍有提升空间
[0016]本实用新型的有益效果是：该电路能够实现变频逆变电路供电电压的稳定输出，并采用改变调制频率的方式，保证测量的准确度；采用调制调制波形幅值进而改变变脉宽的方式调制输出电流，实现输出波形的调压和变频输出，可以避免工频干扰的影响和输出电压电流的多级调节，具有可变频与成本低的优点，电路结构简单，有利于实现便携式测量，极大的扩展了设备的适用场合和便利性。
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Abstract
Description
Technical Field
[0001] This utility model belongs to the field of contact resistance testing technology, and more specifically, relates to a contact resistance tester circuit based on high-frequency electronic devices. Background Technology
[0002] In power plant auxiliary power systems, there are numerous electrical connections, and the contact resistance of these connections is crucial. When connections exhibit oxidation of contact surfaces, insufficient torque on connecting screws, or minute gaps in the connection surfaces, the contact resistance may exceed acceptable limits. During operation, excessive contact resistance can easily lead to overheating, electro-corrosion, and in severe cases, even equipment melting due to overheating. Therefore, accurately measuring the contact resistance of critical electrical connections is of paramount importance for ensuring the stable operation of power plant auxiliary power systems.
[0003] Currently, micro-impedance measurement mainly includes the bridge measurement method, DC resistance measurement method, and power frequency impedance measurement method. During the testing process, the bridge measurement method is easily affected by strong power frequency signal interference, which can lead to large errors in the measurement results and affect the accuracy of the measurement. The DC resistance measurement method is difficult to implement with large-capacity low-voltage DC power supplies, and the DC impedance measurement device is relatively expensive, as well as large in size and weight, making it inconvenient to carry and operate. Although the power frequency impedance measurement method provides relatively accurate test results, it uses a power frequency isolation transformer to isolate the tested device from the power supply, and there is still room for improvement in terms of the overall equipment's portability, size, and cost.
[0004] Existing technologies have varying degrees of shortcomings in terms of measurement accuracy, equipment size, weight, cost, and anti-interference capabilities. There is an urgent need for a micro-impedance measurement circuit that can reduce instrument size and weight, improve portability and automation, and reduce equipment costs while ensuring measurement accuracy. Summary of the Invention
[0005] To solve the above-mentioned technical problems, this utility model provides a contact resistance tester circuit based on high-frequency electronic devices, comprising: Sine wave inverter generator circuit, SPWM push-pull circuit, driver circuit, output interface circuit and comparison feedback circuit; The output of the sine wave inverter generator circuit is electrically connected to the input of the driver circuit via an SPWM push-pull circuit; the output of the driver circuit is electrically connected to the output interface circuit; and the output of the output interface circuit is electrically connected to the input of the sine wave inverter generator circuit and the enable input of the driver circuit via a comparison feedback circuit.
[0006] Based on the above technical solution, the present invention can be further improved as follows.
[0007] Furthermore, the sine wave inverter generator circuit includes a first DC power supply, a first resistor, a light-emitting diode (LED), a sine wave inverter generator chip, and a crystal oscillator circuit; the first DC power supply is electrically connected to the anode of the LED through the first resistor; the cathode of the LED is electrically connected to the power interface of the sine wave inverter generator chip; the crystal oscillator circuit is electrically connected to the crystal oscillator input terminal of the sine wave inverter generator chip; and the output terminal of the sine wave inverter generator chip is electrically connected to the input terminal of the SPWM push-pull circuit.
[0008] Furthermore, the SPWM push-pull circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor; the first output terminal of the sine wave inverter generator circuit is electrically connected to the emitter of the first transistor and the first terminal of the third resistor; the second terminal of the third resistor is electrically connected to the base of the second transistor; the second output terminal of the sine wave inverter generator circuit is electrically connected to the first terminal of the second resistor and the emitter of the second transistor; the second terminal of the second resistor is electrically connected to the base of the first transistor; the third output terminal of the sine wave inverter generator circuit is electrically connected to the emitter of the third transistor and the first terminal of the fifth resistor; the second terminal of the fifth resistor is electrically connected to the base of the fourth transistor; the fourth output terminal of the sine wave inverter generator circuit is electrically connected to the fourth... The first terminal of the resistor is electrically connected to the emitter of the fourth transistor; the second terminal of the fourth resistor is electrically connected to the base of the third diode; the collector of the first transistor is electrically connected to the first terminal of the sixth resistor, the first output terminal of the SPWM push-pull circuit, and the first input terminal of the driver circuit; the collector of the second transistor is electrically connected to the first terminal of the seventh resistor, the second output terminal of the SPWM push-pull circuit, and the second input terminal of the driver circuit; the collector of the third transistor is electrically connected to the first terminal of the eighth resistor, the third output terminal of the SPWM push-pull circuit, and the third input terminal of the driver circuit; the collector of the fourth transistor is electrically connected to the first terminal of the ninth resistor, the fourth output terminal of the SPWM push-pull circuit, and the fourth input terminal of the driver circuit; the second terminals of the sixth, seventh, eighth, and ninth resistors are grounded.
[0009] Furthermore, the driver circuit includes a first gate driver chip and a second gate driver chip; the first input terminal of the first gate driver chip is electrically connected to the first output terminal and the second output terminal of the SPWM push-pull circuit; the first input terminal of the second gate driver chip is electrically connected to the third output terminal and the fourth output terminal of the SPWM push-pull circuit.
[0010] Furthermore, both the first gate driver chip and the second gate driver chip are IR2113S driver chips.
[0011] Furthermore, the comparison feedback circuit includes a voltage feedback circuit, a current comparison feedback circuit, and a temperature feedback circuit; the output interface circuit is electrically connected to the input terminals of the voltage feedback circuit, the current comparison feedback circuit, and the temperature feedback circuit, respectively; the output terminals of the voltage feedback circuit, the first output terminal of the current comparison feedback circuit, and the temperature feedback circuit are electrically connected to the feedback input terminal of the sine wave inverter generator circuit, respectively; and the second output terminal of the current comparison feedback circuit is electrically connected to the control input terminal of the driver circuit.
[0012] Furthermore, the voltage feedback circuit includes a tenth resistor; the first end of the tenth resistor is electrically connected to the first feedback input terminal of the sine wave inverter generator circuit; the second end of the tenth resistor is electrically connected to the output interface circuit.
[0013] Furthermore, the current comparison feedback circuit includes an eleventh resistor, a twelfth resistor, a second DC power supply, a thirteenth resistor, a fourteenth resistor, a first capacitor, a dual voltage comparator, a third DC power supply, a fifteenth resistor, and a sixteenth resistor; the second terminal of the eleventh resistor is electrically connected to the output interface circuit; the first terminal of the eleventh resistor is electrically connected to the second terminal of the twelfth resistor, the first input terminal of the dual voltage comparator, and the second terminal of the sixteenth resistor; the third DC power supply is electrically connected through the first terminals of the fifteenth and sixteenth resistors, the output terminal of the dual voltage comparator, and the control input terminal of the driver circuit; the second DC power supply is electrically connected to the power input terminal of the dual voltage comparator and the first terminal of the thirteenth resistor; the second terminal of the thirteenth resistor is connected to the first terminal of the fourteenth resistor, the first terminal of the first capacitor, and the second input terminal of the dual voltage comparator; the second terminal of the fourteenth resistor and the second terminal of the first capacitor are grounded; the first terminal of the twelfth resistor is electrically connected to the feedback input terminal of the sine wave inverter generator circuit.
[0014] Furthermore, the voltage feedback circuit, current comparison feedback circuit, and temperature feedback circuit all include filter capacitor circuits.
[0015] Furthermore, the output interface circuit is equipped with a fourth DC power supply, an output interface, and a temperature sensor; the fourth DC power supply is electrically connected to the power input terminal of the output interface; and the temperature sensor is electrically connected to the output terminal of the output interface.
[0016] The beneficial effects of this utility model are: the circuit can achieve a stable output of the power supply voltage of the frequency converter circuit, and the accuracy of the measurement is ensured by changing the modulation frequency; the output current is modulated by changing the amplitude of the modulation waveform and thus changing the pulse width, so as to realize the voltage regulation and frequency conversion output of the output waveform, which can avoid the influence of power frequency interference and multi-level adjustment of output voltage and current. It has the advantages of variable frequency and low cost. The circuit structure is simple, which is conducive to realizing portable measurement and greatly expands the application occasions and convenience of the equipment. Attached Figure Description
[0017] Figure 1 A schematic diagram of the circuit for a contact resistance tester based on high-frequency electronic devices provided by this utility model; Figure 2 The circuit diagram shows the sine wave inverter generator circuit and the SPWM push-pull circuit. Figure 3 The circuit diagram for the comparison feedback circuit.
[0018] Icons: R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; R5 - Fifth resistor; R6 - Sixth resistor; R7 - Seventh resistor; R8 - Eighth resistor; R9 - Ninth resistor; R10 - Tenth resistor; R11 - Eleventh resistor; R12 - Twelfth resistor; R13 - Thirteenth resistor; R14 - Fourteenth resistor; R15 - Fifteenth resistor; R16 - Sixteenth resistor; R17 - Seventeenth resistor; R18 - Tenth resistor Eight resistors; U1 - Sine wave inverter generator chip; U2 - First gate driver chip; U3 - Second gate driver chip; U4 - Dual voltage comparator; D1 - Light emission diode; Q1 - First transistor; Q2 - Second transistor; Q3 - Third transistor; Q4 - Fourth transistor; C1 - First capacitor; C2 - Second capacitor; C3 - Third capacitor; C4 - Fourth capacitor; V1 - First DC power supply; V2 - Second DC power supply; V3 - Third DC power supply. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0020] As an example, see the attached document. Figure 1 As shown, to solve the above-mentioned technical problems, this embodiment provides a contact resistance tester circuit based on high-frequency electronic devices, including: Sine wave inverter generator circuit, SPWM push-pull circuit, driver circuit, output interface circuit and comparison feedback circuit; The output of the sine wave inverter generator circuit is electrically connected to the input of the driver circuit via an SPWM push-pull circuit; the output of the driver circuit is electrically connected to the output interface circuit; and the output of the output interface circuit is electrically connected to the input of the sine wave inverter generator circuit and the enable input of the driver circuit via a comparison feedback circuit.
[0021] This circuit uses a sine wave inverter generator circuit to output an SPWM pulse width modulation waveform, which enters the input terminal of the driver circuit after passing through an SPWM push-pull circuit. The driver circuit enhances the waveform according to its internal circuitry and performs bootstrap voltage boosting before outputting it. The comparison feedback circuit collects the sampled voltage value of the constantan resistor in the main circuit and compares it with the reference voltage of the comparison feedback circuit to determine whether the main circuit is overcurrent. When the sampled voltage value of the constantan resistor in the main circuit is greater than the reference voltage of the comparison feedback circuit, the comparison feedback circuit outputs a low level and pulls down the enable terminal of the driver circuit, thereby turning off the output.
[0022] This circuit enables a stable output of the power supply voltage for the frequency converter circuit and achieves cross-frequency measurement by changing the modulation frequency. Furthermore, it modulates the output current by varying the amplitude of the modulation waveform and thus changing the pulse width, achieving 256 levels of voltage regulation and a 40-60Hz frequency conversion output. This avoids the influence of power frequency interference and allows for multi-level adjustment of output voltage and current. It boasts the advantages of frequency conversion and low cost, greatly expanding the applicability and convenience of the equipment.
[0023] Optional, as shown in the appendix Figure 2 As shown, the sine wave inverter generator circuit includes a first DC power supply V1, a first resistor R1, a light-emitting diode D1, a sine wave inverter generator chip U1, and a crystal oscillator circuit. The first DC power supply V1 is electrically connected to the anode of the light-emitting diode D1 through the first resistor R1. The cathode of the light-emitting diode D1 is electrically connected to the power interface of the sine wave inverter generator chip U1. The crystal oscillator circuit is electrically connected to the crystal input terminal of the sine wave inverter generator chip U1. The output terminal of the sine wave inverter generator chip U1 is electrically connected to the input terminal of the SPWM push-pull circuit.
[0024] Optional, as shown in the appendix Figure 2As shown, the SPWM push-pull circuit includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. The first output terminal of the sine wave inverter generator circuit is electrically connected to the emitter of the first transistor Q1 and the first terminal of the third resistor R3; the second terminal of the third resistor R3 is electrically connected to the base of the second transistor Q2; the second output terminal of the sine wave inverter generator circuit is electrically connected to the first terminal of the second resistor R2 and the emitter of the second transistor Q2; the second terminal of the second resistor R2 is electrically connected to the base of the first transistor Q1; the third output terminal of the sine wave inverter generator circuit is electrically connected to the emitter of the third transistor Q3 and the first terminal of the fifth resistor R5; the second terminal of the fifth resistor R5 is electrically connected to the base of the fourth transistor Q4; the fourth output terminal of the sine wave inverter generator circuit is electrically connected to the emitter of the third transistor Q3 and the first terminal of the fifth resistor R5; the fifth output terminal of the fifth resistor R5 is electrically connected to the base of the fourth transistor Q4; the fifth output terminal of the sine wave inverter generator circuit is electrically connected to the emitter of the third transistor Q3 and the first terminal of the fifth resistor R5; the fifth output terminal of the fifth resistor R5 is electrically connected to the base of the fourth transistor Q4; the sixth output terminal of the sine wave inverter generator circuit is electrically connected to the emitter of the third transistor Q3 and the emitter ... The four output terminals are electrically connected to the first terminal of the fourth resistor R4 and the emitter of the fourth transistor Q4; the second terminal of the fourth resistor R4 is electrically connected to the base of the third diode D1; the collector of the first transistor Q1 is electrically connected to the first terminal of the sixth resistor R6, the first output terminal of the SPWM push-pull circuit, and the first input terminal of the driver circuit; the collector of the second transistor Q2 is electrically connected to the first terminal of the seventh resistor R7, the second output terminal of the SPWM push-pull circuit, and the second input terminal of the driver circuit; the collector of the third transistor Q3 is electrically connected to the first terminal of the eighth resistor R8, the third output terminal of the SPWM push-pull circuit, and the third input terminal of the driver circuit; the collector of the fourth transistor Q4 is electrically connected to the first terminal of the ninth resistor R9, the fourth output terminal of the SPWM push-pull circuit, and the fourth input terminal of the driver circuit; the second terminals of the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are grounded.
[0025] Optional, as shown in the appendix Figure 2 As shown, the driver circuit includes a first gate driver chip U2 and a second gate driver chip U3; the first input terminal of the first gate driver chip U2 is electrically connected to the first output terminal and the second output terminal of the SPWM push-pull circuit; the first input terminal of the second gate driver chip U3 is electrically connected to the third output terminal and the fourth output terminal of the SPWM push-pull circuit.
[0026] Optionally, both the first gate driver chip U2 and the second gate driver chip U3 are IR2113S driver chips.
[0027] Optionally, the comparison feedback circuit includes a voltage feedback circuit, a current comparison feedback circuit, and a temperature feedback circuit; the output interface circuit is electrically connected to the input terminals of the voltage feedback circuit, the current comparison feedback circuit, and the temperature feedback circuit, respectively; the output terminals of the voltage feedback circuit, the first output terminal of the current comparison feedback circuit, and the temperature feedback circuit are electrically connected to the feedback input terminal of the sine wave inverter generator circuit, respectively; and the second output terminal of the current comparison feedback circuit is electrically connected to the control input terminal of the driver circuit.
[0028] Optional, as shown in the appendix Figure 3 As shown, the voltage feedback circuit includes a tenth resistor R10; the first end of the tenth resistor R10 is electrically connected to the first feedback input terminal of the sine wave inverter generator circuit; the second end of the tenth resistor R10 is electrically connected to the output interface circuit.
[0029] Optional, as shown in the appendix Figure 3 As shown, the current comparison feedback circuit includes an eleventh resistor R11, a twelfth resistor R12, a second DC power supply V2, a thirteenth resistor R13, a fourteenth resistor R14, a first capacitor C1, a dual voltage comparator U4, a third DC power supply V3, a fifteenth resistor R15, and a sixteenth resistor R16. The second terminal of the eleventh resistor R11 is electrically connected to the output interface circuit; the first terminal of the eleventh resistor R11 is electrically connected to the second terminal of the twelfth resistor R12, the first input terminal of the dual voltage comparator U4, and the second terminal of the sixteenth resistor R16; the third DC power supply V3 is connected through the fifteenth resistor R15. 15 is electrically connected to the first terminal of the sixteenth resistor R16, the output terminal of the dual voltage comparator U4, and the control input terminal of the driver circuit; the second DC power supply V2 is electrically connected to the power input terminal of the dual voltage comparator U4 and the first terminal of the thirteenth resistor R13; the second terminal of the thirteenth resistor R13 is connected to the first terminal of the fourteenth resistor R14, the first terminal of the first capacitor C1, and the second input terminal of the dual voltage comparator U4; the second terminal of the fourteenth resistor R14 and the second terminal of the first capacitor C1 are grounded; the first terminal of the twelfth resistor R12 is electrically connected to the feedback input terminal of the sine wave inverter generator circuit.
[0030] As attached Figure 3 As shown, the temperature feedback circuit includes a seventeenth resistor R17 and an eighteenth resistor R18; the first end of the seventeenth resistor R17 is electrically connected to the feedback input terminal of the sine wave inverter generator circuit, the second end of the seventeenth resistor R17 is electrically connected to the output interface and the first end of the eighteenth resistor R18; the second end of the eighteenth resistor R18 is grounded.
[0031] Optionally, the voltage feedback circuit, current comparison feedback circuit, and temperature feedback circuit all include a filter capacitor circuit.
[0032] As attached Figure 3As shown, the first end of the tenth resistor R10 is electrically connected to the first end of the second capacitor C2; the first end of the eleventh resistor R11 is electrically connected to the first end of the third capacitor C3; and the first end of the seventeenth resistor R17 is electrically connected to the first end of the fourth capacitor C4.
[0033] Optionally, the output interface circuit includes a fourth DC power supply, an output interface, and a temperature sensor; the fourth DC power supply is electrically connected to the power input terminal of the output interface; and the temperature sensor is electrically connected to the output terminal of the output interface.
[0034] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A contact resistance tester circuit based on high-frequency electronic devices, characterized in that, include: Sine wave inverter generator circuit, SPWM push-pull circuit, driver circuit, output interface circuit and comparison feedback circuit; The output of the sine wave inverter generator circuit is electrically connected to the input of the driver circuit via an SPWM push-pull circuit; the output of the driver circuit is electrically connected to the output interface circuit; and the output of the output interface circuit is electrically connected to the input of the sine wave inverter generator circuit and the enable input of the driver circuit via a comparison feedback circuit.
2. The contact resistance tester circuit based on high-frequency electronic devices according to claim 1, characterized in that, The sine wave inverter generator circuit includes a first DC power supply, a first resistor, a light-emitting diode (LED), a sine wave inverter generator chip, and a crystal oscillator circuit. The first DC power supply is electrically connected to the anode of the LED through the first resistor. The cathode of the LED is electrically connected to the power interface of the sine wave inverter generator chip. The crystal oscillator circuit is electrically connected to the crystal input terminal of the sine wave inverter generator chip. The output terminal of the sine wave inverter generator chip is electrically connected to the input terminal of the SPWM push-pull circuit.
3. The contact resistance tester circuit based on high-frequency electronic devices according to claim 1, characterized in that, The SPWM push-pull circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor. The first output terminal of the sine wave inverter generator circuit is electrically connected to the emitter of the first transistor and the first terminal of the third resistor. The second terminal of the third resistor is electrically connected to the base of the second transistor. The second output terminal of the sine wave inverter generator circuit is electrically connected to the first terminal of the second resistor and the emitter of the second transistor. The second terminal of the second resistor is electrically connected to the base of the first transistor. The third output terminal of the sine wave inverter generator circuit is electrically connected to the emitter of the third transistor and the first terminal of the fifth resistor. The second terminal of the fifth resistor is electrically connected to the base of the fourth transistor. The fourth output terminal of the sine wave inverter generator circuit is connected to the fourth resistor. The first terminal of the first transistor is electrically connected to the emitter of the fourth transistor; the second terminal of the fourth resistor is electrically connected to the base of the third diode; the collector of the first transistor is electrically connected to the first terminal of the sixth resistor, the first output terminal of the SPWM push-pull circuit, and the first input terminal of the driver circuit; the collector of the second transistor is electrically connected to the first terminal of the seventh resistor, the second output terminal of the SPWM push-pull circuit, and the second input terminal of the driver circuit; the collector of the third transistor is electrically connected to the first terminal of the eighth resistor, the third output terminal of the SPWM push-pull circuit, and the third input terminal of the driver circuit; the collector of the fourth transistor is electrically connected to the first terminal of the ninth resistor, the fourth output terminal of the SPWM push-pull circuit, and the fourth input terminal of the driver circuit; the second terminals of the sixth, seventh, eighth, and ninth resistors are grounded.
4. The contact resistance tester circuit based on high-frequency electronic devices according to claim 1, characterized in that, The driver circuit includes a first gate driver chip and a second gate driver chip; the first input terminal of the first gate driver chip is electrically connected to the first output terminal and the second output terminal of the SPWM push-pull circuit; the first input terminal of the second gate driver chip is electrically connected to the third output terminal and the fourth output terminal of the SPWM push-pull circuit.
5. The contact resistance tester circuit based on high-frequency electronic devices according to claim 4, characterized in that, Both the first gate driver chip and the second gate driver chip are IR2113S driver chips.
6. The contact resistance tester circuit based on high-frequency electronic devices according to claim 1, characterized in that, The comparison feedback circuit includes a voltage feedback circuit, a current comparison feedback circuit, and a temperature feedback circuit; the output interface circuit is electrically connected to the input terminals of the voltage feedback circuit, the current comparison feedback circuit, and the temperature feedback circuit, respectively; the output terminals of the voltage feedback circuit, the first output terminal of the current comparison feedback circuit, and the output terminal of the temperature feedback circuit are electrically connected to the feedback input terminal of the sine wave inverter generator circuit, respectively. The second output terminal of the current comparison feedback circuit is electrically connected to the control input terminal of the driver circuit.
7. The contact resistance tester circuit based on high-frequency electronic devices according to claim 6, characterized in that, The voltage feedback circuit includes a tenth resistor; the first end of the tenth resistor is electrically connected to the first feedback input terminal of the sine wave inverter generator circuit; the second end of the tenth resistor is electrically connected to the output interface circuit.
8. The contact resistance tester circuit based on high-frequency electronic devices according to claim 6, characterized in that, The current comparison feedback circuit includes an eleventh resistor, a twelfth resistor, a second DC power supply, a thirteenth resistor, a fourteenth resistor, a first capacitor, a dual voltage comparator, a third DC power supply, a fifteenth resistor, and a sixteenth resistor; the second terminal of the eleventh resistor is electrically connected to the output interface circuit; the first terminal of the eleventh resistor is electrically connected to the second terminal of the twelfth resistor, the first input terminal of the dual voltage comparator, and the second terminal of the sixteenth resistor. The third DC power supply is electrically connected to the first terminals of the fifteenth and sixteenth resistors, the output terminal of the dual voltage comparator, and the control input terminal of the driver circuit; the second DC power supply is electrically connected to the power input terminal of the dual voltage comparator and the first terminal of the thirteenth resistor; the second terminal of the thirteenth resistor is connected to the first terminal of the fourteenth resistor, the first terminal of the first capacitor, and the second input terminal of the dual voltage comparator; the second terminal of the fourteenth resistor and the second terminal of the first capacitor are grounded; the first terminal of the twelfth resistor is electrically connected to the feedback input terminal of the sine wave inverter generator circuit.
9. The contact resistance tester circuit based on high-frequency electronic devices according to claim 6, characterized in that, Voltage feedback circuit, current comparison feedback circuit, and temperature feedback circuit all include filter capacitor circuits.
10. The contact resistance tester circuit based on high-frequency electronic devices according to claim 6, characterized in that, The output interface circuit is equipped with a fourth DC power supply, an output interface, and a temperature sensor; the fourth DC power supply is electrically connected to the power input terminal of the output interface; and the temperature sensor is electrically connected to the output terminal of the output interface.