A multi-output mode power supply circuit, test apparatus

Abstract

The application discloses a multi-output mode power supply circuit and a test device. The multi-output mode power supply circuit comprises a signal generation module, a power amplification module, a feedback resistance module and a feedback resistance switching control module. The signal generation module outputs a voltage control signal through a first output end, and outputs a driving signal through a second output end. The power amplification module is used for current amplification or voltage amplification according to the voltage control signal of the first input end. The feedback resistance module is used for connecting the feedback resistance into the power amplification module. The feedback resistance switching control module is used for controlling the switching of the feedback resistance in the feedback resistance module according to the received driving signal, and controlling the power amplification module to work in a current amplification mode or a voltage amplification mode. The voltage control signal output by the signal generation module passes through the power amplification module in different working states, and the multi-output mode of the power supply circuit is realized.

Description

A power supply circuit with multiple output modes and testing equipment Technical Field

[0001] This invention relates to the field of power testing technology, and in particular to a power supply circuit and testing equipment with multiple output modes. Background Technology

[0002] Regular testing of electrical equipment after it is put into use requires testing equipment to inject a specific voltage or current into the object under test.

[0003] Currently, the power supply circuits of testing equipment include DC resistance testers and turns ratio testers. The DC resistance tester outputs a constant DC current, and the turns ratio tester outputs a stable AC voltage.

[0004] However, the power supply circuits of existing test equipment have a single output mode, which cannot meet the testing requirements when comprehensive testing of transformers and other devices is needed. Summary of the Invention

[0005] This invention provides a power supply circuit and testing equipment with multiple output modes to solve the problem of single output mode in the power supply circuits of existing testing equipment.

[0006] According to one aspect of the present invention, a power supply circuit with multiple output modes is provided, the circuit including a signal generation module, a power amplification module, a feedback resistor module and a feedback resistor switching control module;

[0007] The signal generation module includes a first output terminal and a second output terminal. The signal generation module outputs a voltage control signal through the first output terminal and a drive signal through the second output terminal.

[0008] The first input terminal of the power amplifier module is connected to the first output terminal of the signal generation module, and the power amplifier module is used to amplify current or voltage according to the input signal at its first input terminal.

[0009] The first end of the feedback resistor module is connected to the first feedback terminal of the power amplifier module, the second end of the feedback resistor module is connected to the second feedback terminal of the power amplifier module, the third end of the feedback resistor module is connected to the first input terminal of the power amplifier module, and the fourth end of the feedback resistor module is connected to the second input terminal of the power amplifier module; the feedback resistor module is used to connect the feedback resistor to the power amplifier module, wherein the first feedback terminal is the output terminal of the power amplifier module;

[0010] The input terminal of the feedback resistor switching control module is connected to the second output terminal of the signal generation module, and the output terminal of the feedback resistor switching control module is connected to the control terminal of the feedback resistor module. The feedback resistor switching control module is used to control the switching of the feedback resistor in the feedback resistor module according to the received drive signal, so as to change the feedback resistor connected to the power amplifier module and control the power amplifier module to work in current amplification mode or voltage amplification mode.

[0011] Optionally, the voltage control signal output from the first output terminal of the signal generation module includes a positive DC signal, a negative DC signal, an AC signal with continuously varying amplitude, and an AC signal with continuously varying frequency. The positive DC signal or the negative DC signal is input to the power amplification module as the voltage control signal. When the power amplification module operates in current amplification mode, the power supply circuit of the multi-output mode acts as a DC constant current power supply. The continuously varying amplitude AC signal is input to the power amplification module as the voltage control signal. When the power amplification module operates in current amplification mode, the power supply circuit of the multi-output mode acts as an AC constant current power supply. The continuously varying amplitude AC signal is input to the power amplification module as the voltage control signal. When the power amplification module operates in voltage amplification mode, the power supply circuit of the multi-output mode acts as an AC voltage source. The continuously varying frequency AC signal is input to the power amplification module as the voltage control signal. When the power amplification module operates in voltage amplification mode, the power supply circuit of the multi-output mode acts as a frequency conversion voltage source.

[0012] Optionally, the signal generation module includes a microprocessor and a digital-to-analog converter (DAC); the microprocessor outputs a digital signal, the DAC is connected to the microprocessor and receives the digital signal output by the microprocessor, the output terminal of the DAC is connected to the first output terminal of the signal generation module, and the DAC is used to convert the received digital signal into an analog signal and output the analog signal through the output terminal.

[0013] Optionally, the power supply circuit of the multi-output mode further includes a signal buffer module. The input terminal of the signal buffer module is connected to the first output terminal of the signal generation module, and the output terminal of the signal buffer module is connected to the first input terminal of the power amplifier module. The signal buffer module is used to buffer the input voltage control signal.

[0014] Optionally, the signal buffer module includes a first operational amplifier, a first resistor module, a second resistor module, a third resistor module, a fourth resistor module, and a first capacitor; the negative input terminal of the first operational amplifier is connected to one end of the first resistor module, one end of the second resistor module, one end of the third resistor module, and one end of the first capacitor; the other end of the first resistor module is connected to the input terminal of the signal buffer module; the other end of the second resistor module is connected to the output terminal of the first operational amplifier; the other end of the third resistor module is grounded; the other end of the first capacitor is connected to the output terminal of the first operational amplifier; the positive input terminal of the first operational amplifier is connected to one end of the fourth resistor module; the other end of the fourth resistor module is grounded; and the output terminal of the first operational amplifier is connected to the output terminal of the signal buffer module.

[0015] Optionally, the power amplifier module includes a second operational amplifier, a fifth resistor module, a sixth resistor module, a seventh resistor module, an eighth resistor module, a ninth resistor module, a tenth resistor module, an eleventh resistor module, a twelfth resistor module, a thirteenth resistor module, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a first transistor, a second transistor, a third transistor, and a fourth transistor; the positive input terminal of the second operational amplifier is connected to one end of the fifth resistor module, the other end of the fifth resistor module is grounded, the negative input terminal of the second operational amplifier is connected to one end of the sixth resistor module, the other end of the sixth resistor module is connected to the output terminal of the signal buffer module, and the second capacitor is connected between the output terminal and the negative input terminal of the second operational amplifier; the output terminal of the second operational amplifier is connected to one end of the seventh resistor module, the other end of the seventh resistor module is connected to one end of the eighth resistor module and the anode of the first diode; the other end of the eighth resistor module is connected to the cathode of the second diode. The anode of the second diode is connected to the base of the first transistor. The ninth resistor module and the third capacitor are connected in parallel between the base and collector of the first transistor. The collector of the first transistor is connected to a first power supply. The transmitter of the first transistor is connected to the base of the second transistor. The collector of the second transistor is connected to the first power supply. The emitter of the second transistor is connected to one end of the tenth resistor module. The cathode of the first diode is connected to the base of the third transistor. The eleventh resistor module and the fourth capacitor are connected in parallel between the base and collector of the third transistor. The collector of the third transistor is connected to a second power supply. The emitter of the third transistor is connected to the base of the fourth transistor. The collector of the fourth transistor is connected to the second power supply. The emitter of the fourth transistor is connected to one end of the twelfth resistor module. The other end of the twelfth resistor module is connected to the other end of the tenth resistor module and one end of the thirteenth resistor module. The other end of the thirteenth resistor module is connected to the output terminal of the power amplifier module.

[0016] Optionally, the feedback resistor switching control module includes a first control switch and a second control switch; the feedback resistor switching control module is used to control the first control switch and the second control switch to be turned on or off according to the drive signal output by the signal generation module; the feedback resistor module includes a fourteenth resistor module, a fifteenth resistor module, a sixteenth resistor module, and a seventeenth resistor module; one end of the fourteenth resistor module and one end of the first control switch are connected to the first end of the feedback resistor module, the other end of the fourteenth resistor module is connected to the third end of the feedback resistor module, the other end of the first control switch is connected to one end of the fifteenth resistor module, the other end of the fifteenth resistor module is connected to the third end of the feedback resistor module, one end of the second control switch is connected to the second end of the feedback resistor module, the other end of the second control switch is connected to one end of the sixteenth resistor module and one end of the seventeenth resistor module, and the other ends of the sixteenth resistor module and the seventeenth resistor module are connected to the fourth end of the feedback resistor module.

[0017] Optionally, the feedback resistor switching control module includes a drive unit and a relay unit; the relay unit includes a first contact switch and a second contact switch, which serve as the first control switch and the second control switch, respectively; the input terminal of the drive unit is connected to the second output terminal of the signal generation module, and the drive unit is used to generate a level signal according to the drive signal output by the second output terminal of the signal generation module; the input terminal of the relay unit is connected to the output terminal of the drive unit, and the relay unit is used to receive the level signal output by the drive unit and control the state of the first contact switch and the second contact switch.

[0018] Optionally, the driving unit includes a fifth transistor, an eighteenth resistor module, and a nineteenth resistor module; the base of the fifth transistor is connected to one end of the eighteenth resistor module and one end of the nineteenth resistor module, the other end of the eighteenth resistor module is connected to the input terminal of the driving unit, the other end of the nineteenth resistor module is connected to the emitter of the fifth transistor, the emitter of the fifth transistor is grounded, and the collector of the fifth transistor is connected to the output terminal of the driving unit.

[0019] Optionally, the relay unit includes a relay coil and a third diode; the anode of the third diode is connected to the input terminal of the relay unit, the cathode of the third diode is connected to a fourth power supply, and the relay coil is connected in parallel across the two ends of the third diode.

[0020] According to another aspect of the present invention, a test apparatus is provided, the test apparatus including the power supply circuit of the multi-output mode.

[0021] The technical solution of this invention provides a multi-output mode power supply circuit including a signal generation module, a power amplification module, a feedback resistor module, and a feedback resistor switching control module. The signal generation module includes a first output terminal and a second output terminal. The signal generation module outputs a voltage control signal through the first output terminal and a drive signal through the second output terminal. The first input terminal of the power amplification module is connected to the first output terminal of the signal generation module, and the power amplification module is used to amplify current or voltage according to the input signal at its first input terminal. The first terminal of the feedback resistor module is connected to the first feedback terminal of the power amplification module, and the second terminal of the feedback resistor module is connected to the second feedback terminal of the power amplification module. The third terminal of the feedback resistor module is connected to the first input terminal of the power amplifier module, and the fourth terminal of the feedback resistor module is connected to the second input terminal of the power amplifier module. The feedback resistor module is used to connect a feedback resistor to the power amplifier module, wherein the first feedback terminal is the output terminal of the power amplifier module. The input terminal of the feedback resistor switching control module is connected to the second output terminal of the signal generation module, and the output terminal of the feedback resistor switching control module is connected to the control terminal of the feedback resistor module. The feedback resistor switching module is used to control the switching of the feedback resistor in the feedback resistor module according to the received drive signal, so as to change the feedback resistor connected to the power amplifier module and control the power amplifier module to work in current amplification mode or voltage amplification mode. In the multi-output mode power supply circuit, the voltage control signal output by the signal generation module passes through the power amplifier modules in different operating states, realizing the multi-output mode of the power supply circuit and solving the problem of the single output mode of the power supply circuit in the prior art.

[0022] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of a power supply circuit structure with multiple output modes provided in an embodiment of the present invention;

[0025] Figure 2 is a circuit diagram of the signal generation module provided in an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of another power supply circuit structure with multiple output modes provided in an embodiment of the present invention;

[0027] Figure 4 is a circuit diagram of the signal buffer module provided in an embodiment of the present invention;

[0028] Figure 5 is a circuit diagram of the power amplifier module provided in an embodiment of the present invention;

[0029] Figure 6 is a schematic diagram of the feedback resistor switching control module provided in an embodiment of the present invention;

[0030] Figure 7 is a circuit diagram of a power supply circuit with multiple output modes provided in an embodiment of the present invention. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] Figure 1 is a schematic diagram of a power supply circuit structure with multiple output modes according to an embodiment of the present invention. As shown in Figure 1, the power supply circuit 100 with multiple output modes includes a signal generation module 110, a power amplification module 120, a feedback resistor module 130, and a feedback resistor switching control module 140. The signal generation module 110 includes a first output terminal b1 and a second output terminal b2. The signal generation module 110 outputs a voltage control signal through the first output terminal b1 and a drive signal through the second output terminal b2. The first input terminal a1 of the power amplification module 120 is connected to the first output terminal b1 of the signal generation module. The power amplification module 120 is used to amplify current or voltage according to the input signal at its first input terminal a1. The first terminal a3 of the feedback resistor module 130 is connected to the first feedback terminal b3 of the power amplification module 120, and the second terminal a4 of the feedback resistor module 130 is connected to the power amplification module 120. The second feedback terminal b4 of module 120 and the third terminal b5 of feedback resistor module 130 are connected to the first input terminal a1 of power amplifier module 120, and the fourth terminal b6 of feedback resistor module 130 is connected to the second input terminal a2 of power amplifier module 120. Feedback resistor module 130 is used to connect feedback resistors to power amplifier module 120, wherein the first feedback terminal b3 is the output terminal of power amplifier module 120. The input terminal a5 of feedback resistor switching control module 140 is connected to the second output terminal b2 of signal generation module 110, and the output terminal b7 of feedback resistor switching control module 140 is connected to the control terminal a6 of feedback resistor module 130. Feedback resistor switching control module 140 is used to control the switching of feedback resistors in feedback resistor module 130 according to the received drive signal, so as to change the feedback resistor connected to power amplifier module 120 and control power amplifier module 120 to work in current amplification mode or voltage amplification mode.

[0034] In this embodiment, the multi-output mode power supply circuit is a power supply circuit capable of outputting various power signals, such as voltage signals, current signals, AC signals, DC signals, and other forms. The signal generation circuit 110 is a signal generation circuit, including a signal generating device. For example, the signal generation circuit 110 can employ DDS (Direct Digital Synthesizer) technology, utilizing the amplitude modulation, frequency modulation, and phase modulation functions of DDS technology to generate various forms of voltage control signals. The power amplifier module 120 is a circuit that amplifies the input signal, for example, including a differential amplifier. The feedback resistor module 130 is a module that connects the feedback resistor to the power amplifier module 120. The feedback resistor module 130 includes multiple resistor modules, and the feedback resistor switching control module 140 controls the switching of the multiple resistor modules in the feedback resistor module 130, i.e., controls the switching of the feedback resistor module 130 connected to the feedback resistor of the power amplifier module 120.

[0035] In this embodiment, the signal generation module 110 uses DDS technology to generate voltage control signals in multiple modes. The signal generation module 110 inputs the voltage control signals to the power amplifier module 120 through its first output terminal. The first feedback terminal b3 and the second feedback terminal b4 of the power amplifier module 120 are respectively connected to the first and second terminals of the feedback resistor module 130. The feedback resistor module receives the signal output by the power amplifier module and feeds it back to the power amplifier module 120. The feedback resistor connected to the power amplifier module 120 by the feedback resistor module 130 is controlled by the feedback resistor switching control module 140. The feedback resistor switching control module 140 includes a relay. The feedback resistor switching control module 140 controls the relay to turn on or off according to the drive signal output by the signal generation module 110, thereby changing the feedback resistor connected to the power amplifier module 120 by the feedback resistor module 130, thus controlling the power amplifier module 120 to operate in current amplification mode or voltage amplification mode. The power amplifier module 120 operates in current amplification mode or voltage amplification mode according to the input voltage control signals in multiple modes, and outputs power signals in multiple modes.

[0036] This embodiment provides a multi-output mode power supply circuit including a signal generation module, a power amplification module, a feedback resistor module, and a feedback resistor switching control module. The signal generation module includes a first output terminal and a second output terminal. The signal generation module outputs a voltage control signal through the first output terminal and a drive signal through the second output terminal. The first input terminal of the power amplification module is connected to the first output terminal of the signal generation module, and the power amplification module is used to amplify current or voltage according to the input signal at its first input terminal. The first terminal of the feedback resistor module is connected to the first feedback terminal of the power amplification module, and the second terminal of the feedback resistor module is connected to the second feedback terminal of the power amplification module. The third terminal of the resistor module is connected to the first input terminal of the power amplifier module, and the fourth terminal of the feedback resistor module is connected to the second input terminal of the power amplifier module. The feedback resistor module is used to connect a feedback resistor to the power amplifier module, wherein the first feedback terminal is the output terminal of the power amplifier module. The input terminal of the feedback resistor switching control module is connected to the second output terminal of the signal generation module, and the output terminal of the feedback resistor switching control module is connected to the control terminal of the feedback resistor module. The feedback resistor switching module is used to control the switching of the feedback resistor in the feedback resistor module according to the received drive signal, so as to change the feedback resistor connected to the power amplifier module and control the power amplifier module to work in current amplification mode or voltage amplification mode. In the multi-output mode power supply circuit, the voltage control signal output by the signal generation module passes through the power amplifier modules in different operating states, realizing the multi-output mode of the power supply circuit and solving the problem of the single output mode of the power supply circuit in the prior art.

[0037] Based on the above embodiments, the voltage control signal output from the first output terminal b1 of the signal generation module 110 includes a positive DC signal, a negative DC signal, an AC signal with continuously varying amplitude, and an AC signal with continuously varying frequency. The positive DC signal or the negative DC signal is input to the power amplifier module 120 as a voltage control signal. When the power amplifier module 120 operates in current amplification mode, the power supply circuit of the multi-output mode acts as a DC constant current power supply. The AC signal with continuously varying amplitude is input to the power amplifier module 120 as a voltage control signal. When the power amplifier module 120 operates in current amplification mode, the power supply circuit of the multi-output mode acts as an AC constant current power supply. The AC signal with continuously varying amplitude is input to the power amplifier module 120 as a voltage control signal. When the power amplifier module 120 operates in voltage amplification mode, the power supply circuit of the multi-output mode acts as an AC voltage source. The AC signal with continuously varying frequency is input to the power amplifier module 120 as a voltage control signal. When the power amplifier module 120 operates in voltage amplification mode, the power supply circuit of the multi-output mode acts as a frequency conversion voltage source.

[0038] In this embodiment, the voltage control signal output by the signal generation module 110 using DDS technology includes a positive DC signal, a negative DC signal, an AC signal with continuously varying amplitude, and an AC signal with continuously varying frequency. DDS technology has advantages such as high frequency resolution, multiple output frequency points, low output phase noise, the ability to output wideband orthogonal signals, and the ability to generate arbitrary waveforms. When the power amplifier module 120 operates in current amplification mode, if a positive DC signal or a negative DC signal is input to the power amplifier module 120 as a voltage control signal, the power amplifier module 120 outputs a constant DC current. At this time, the power supply circuit of the multi-output mode acts as a DC constant current power supply. If an AC signal with continuously varying amplitude is input to the power amplifier module 120 as a voltage control signal, the power amplifier module 120 outputs a constant AC current signal. At this time, the power supply circuit of the multi-output mode acts as an AC constant current power supply. When the power amplifier module 120 operates in voltage amplification mode, if an AC signal with continuously varying amplitude is input to the power amplifier module 120 as a voltage control signal, the power amplifier module 120 outputs a stable AC voltage. In this case, the power supply circuit in multi-output mode acts as an AC voltage source. If an AC signal with continuously varying frequency is input to the power amplifier module 120 as a voltage control signal, the power amplifier module 120 outputs a continuously varying AC voltage. In this case, the power supply circuit in multi-output mode acts as a frequency conversion voltage source.

[0039] Figure 2 is a circuit diagram of the signal generation module provided in an embodiment of the present invention. As shown in Figure 2, the signal generation module 110 includes a microprocessor U1 and a digital-to-analog converter U2. The microprocessor U1 outputs digital signals, and the digital-to-analog converter U2 is connected to the microprocessor U1 and receives the digital signals output by the microprocessor. The output terminal of the digital-to-analog converter U2 is connected to the first output terminal b1 of the signal generation module 110. The digital-to-analog converter U2 is used to convert the received digital signals into analog signals and output the analog signals through the output terminal. The microprocessor U1 is connected to the second output terminal b2 of the signal generation module 110. The signal generation module 110 also includes a crystal oscillator CR1, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a twentieth resistor R20, and a twenty-first resistor R21. One end of the crystal oscillator CR1 is connected to one end of the microprocessor U1 and one end of the fifth capacitor C5, and the other end of the crystal oscillator CR1 is connected to one end of the microprocessor U1 and one end of the sixth capacitor C6. The other ends of the fifth capacitor C5 and the sixth capacitor C6 are grounded. One end of the twentieth resistor R20 is connected to one end of the twenty-first resistor R21 and one end of the seventh capacitor C7. The other end of the twentieth resistor R20 is connected to the microprocessor U1. The other end of the twenty-first resistor R21 is connected to the third power supply V3. The other end of the seventh capacitor C7 is grounded. The microprocessor U1 is connected to the third power supply V3, and the voltage of the third power supply V3 is 3.3V. The microprocessor U1 can be a C8051F330D; this is not limited. The digital-to-analog converter U2 is connected to the fourth voltage V4, the fifth voltage V5, the sixth voltage V6, and the seventh voltage V7. The fourth voltage V4 is 5V, the fifth voltage V5 is +12V, the sixth voltage V6 is -12V, and the seventh voltage V7 is 2.5V. The digital-to-analog converter U2 can be an AD5761; this is not limited.

[0040] Figure 3 is a schematic diagram of another multi-output mode power supply circuit structure provided by an embodiment of the present invention. Based on the above embodiment, the multi-output mode power supply circuit further includes a signal buffer module 310. The input terminal a31 of the signal buffer module 310 is connected to the first output terminal b1 of the signal generation module 110, and the output terminal b31 of the signal buffer module 310 is connected to the first input terminal a1 of the power amplifier module 120. The signal buffer module 310 is used to buffer the input voltage control signal. The signal buffer module 310 can reduce electromagnetic interference, reduce or eliminate voltage and current overshoot, transfer power loss to resistors or useful loads, and regulate the load to keep it within a safe range.

[0041] Figure 4 is a circuit diagram of the signal buffer module provided in an embodiment of the present invention. As shown in Figure 4, the signal buffer module 110 includes a first operational amplifier U3, a first resistor module R1, a second resistor module R2, a third resistor module R3, a fourth resistor module R4, and a first capacitor C1. The negative input terminal of the first operational amplifier U3 is connected to one end of the first resistor module R1, one end of the second resistor module R2, one end of the third resistor module R3, and one end of the first capacitor C1. The other end of the first resistor module R1 is connected to the input terminal a31 of the signal buffer module 310. The other end of the second resistor module R2 is connected to the output terminal of the first operational amplifier U3. The other end of the third resistor module R3 is grounded. The other end of the first capacitor C1 is connected to the output terminal of the first operational amplifier U3. The positive input terminal of the first operational amplifier U3 is connected to one end of the fourth resistor module R4. The other end of the fourth resistor module R4 is grounded. The output terminal of the first operational amplifier U3 is connected to the output terminal b31 of the signal buffer module 310. The first operational amplifier U3 is connected to both the first power supply V1 and the second power supply V2. One end of the first operational amplifier U3 connected to the first power supply V1 is connected to one end of the eighth capacitor C8, and the other end of the eighth capacitor C8 is grounded. One end of the first operational amplifier U3 connected to the second power supply V2 is connected to one end of the ninth capacitor C9, and the other end of the ninth capacitor C9 is grounded. The first operational amplifier U3 can be a TL082, which has advantages such as low power consumption; this is not a limitation. The first power supply V1 is +30V, and the second power supply V2 is -30V.

[0042] Figure 5 is a circuit diagram of the power amplifier module provided in an embodiment of the present invention. As shown in Figure 5, the power amplifier module 120 includes a second operational amplifier U4, a fifth resistor module R5, a sixth resistor module R6, a seventh resistor module R7, an eighth resistor module R8, a ninth resistor module R9, a tenth resistor module R10, an eleventh resistor module R11, a twelfth resistor module R12, a thirteenth resistor module R13, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first diode D1, a second diode D2, a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4. Transistor Q4; The positive input terminal of the second operational amplifier U4 is connected to one end of the fifth resistor module R5, and the other end of the fifth resistor module R5 is grounded; The negative input terminal of the second operational amplifier U4 is connected to one end of the sixth resistor module R6, and the other end of the sixth resistor module R6 is connected to the output terminal b31 of the signal buffer module 310; The second capacitor C2 is connected between the output terminal and the negative input terminal of the second operational amplifier U4; The output terminal of the second operational amplifier U4 is connected to one end of the seventh resistor module R7, and the other end of the seventh resistor module R7 is connected to one end of the eighth resistor module R8 and the first diode D1. Anode; the other end of the eighth resistor module R8 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the base of the first transistor Q1. The ninth resistor module R9 and the third capacitor C3 are connected in parallel between the base and collector of the first transistor Q1. The collector of the first transistor Q1 is connected to the first power supply V1. The emitter of the first transistor Q1 is connected to the base of the second transistor Q2. The collector of the second transistor Q2 is connected to the first power supply V1. The emitter of the second transistor Q2 is connected to one end of the tenth resistor module R10. The cathode of the first diode D1 is connected to the base of the third transistor Q3. The tenth... A resistor module R11 and a fourth capacitor C4 are connected in parallel between the base and collector of the third transistor Q3. The collector of the third transistor Q3 is connected to the second power supply V2. The emitter of the third transistor Q3 is connected to the base of the fourth transistor Q4. The collector of the fourth transistor Q4 is connected to the second power supply V2. The emitter of the fourth transistor Q4 is connected to one end of the twelfth resistor module R12. The other end of the twelfth resistor module R12 is connected to the other end of the tenth resistor module R10 and one end of the thirteenth resistor module R13. The other end of the thirteenth resistor module R13 is connected to the output terminal b3 of the power amplifier module 120.

[0043] In this embodiment, the second operational amplifier U4 constitutes the input signal error amplification stage. The first transistor Q1, second transistor Q2, third transistor Q3, and fourth transistor Q4 form a push-pull amplification stage. The first diode D1 provides the drive bias voltage for the first transistor Q1, and the second diode D2 provides the drive bias voltage for the third transistor Q3. The fifth resistor module R5 and the sixth resistor module R6 are proportional resistors of the power amplifier module 120, and their resistance values ​​are the same. The thirteenth resistor module R13 acts as a current sampler when the power amplifier module operates in current amplification mode, and as an output current limiting resistor when the power amplifier module operates in voltage amplification mode. The second operational amplifier U4 is connected to the first power supply V1 and the second power supply V2. One end of the first operational amplifier U4 connected to the first power supply V1 is connected to one end of the eleventh capacitor C11, and the other end of the eleventh capacitor C11 is grounded. One end of the second operational amplifier U4 connected to the second power supply V2 is connected to one end of the twelfth capacitor C12, and the other end of the ninth capacitor C12 is grounded.

[0044] The power amplifier module 120 also includes a tenth capacitor C10 and a twenty-two resistor R22. One end of the tenth capacitor C10 is connected to the output terminal b3 (i.e., UIout) of the power amplifier module 120, and the other end of the tenth capacitor C10 is connected to one end of the twenty-two resistor R22. The other end of the twenty-two resistor R22 is grounded and also serves as the common output terminal UIcom. The second operational amplifier U4 can be an OPA551; there is no limitation on its type.

[0045] Based on the above embodiments, the feedback resistor switching control module 140 includes a first control switch and a second control switch; the feedback resistor switching control module 140 is used to control the first control switch and the second control switch to be turned on or off according to the drive signal output by the signal generation module 110; the feedback resistor module 130 includes a fourteenth resistor module R14, a fifteenth resistor module R15, a sixteenth resistor module R16, and a seventeenth resistor module R17; one end of the fourteenth resistor module R14 and one end of the first control switch are connected to the first terminal a3 of the feedback resistor module 130, and the fourteenth resistor... The other end of module R14 is connected to the third terminal b5 of feedback resistor module 130. The other end of the first control switch is connected to one end of the fifteenth resistor module R15. The other end of the fifteenth resistor module R15 is connected to the third terminal b5 of feedback resistor module 130. One end of the second control switch is connected to the second terminal a4 of feedback resistor module 130. The other end of the second control switch is connected to one end of the sixteenth resistor module R16 and one end of the seventeenth resistor module R17. The other ends of the sixteenth resistor module R16 and the seventeenth resistor module R17 are connected to the fourth terminal b6 of feedback resistor module 130. The resistance values ​​of the fourteenth resistor module R14 and the sixteenth resistor module R16 are equal, and the resistance values ​​of the fifteenth resistor module R15 and the seventeenth resistor module R17 are equal. When the first and second control switches are turned on, the fourteenth resistor module R14, the fifteenth resistor module R15, the sixteenth resistor module R16, and the seventeenth resistor module R17 in the feedback resistor module 130 are connected to the power amplifier module 120. The voltage signal across the thirteenth resistor module R13 is fed back to the power amplifier module 120 by the feedback resistor module 130. The current output by the power amplifier module 120 can be obtained through the voltage across the thirteenth resistor module R13. At this time, the power amplifier module 120 operates in current amplification mode. When the first and second control switches are turned off, the fourteenth resistor module R14 in the feedback resistor module 130 is connected to the power amplifier module 120. The voltage at one end of the thirteenth resistor module R13 is fed back to the power amplifier module 120 by the feedback resistor module 130. At this time, the power amplifier module 120 operates in voltage amplification mode.

[0046] Figure 6 is a schematic diagram of the feedback resistor switching control module provided in an embodiment of the present invention. As shown in Figure 6, the feedback resistor switching control module 140 includes a drive unit 610 and a relay unit 620. The relay unit 620 includes a first contact switch and a second contact switch, which serve as a first control switch and a second control switch, respectively. The input terminal a61 of the drive unit 610 is connected to the second output terminal b2 of the signal generation module 110. The drive unit 610 is used to generate a level signal according to the drive signal output from the second output terminal b2 of the signal generation module 110. The input terminal a62 of the relay unit 620 is connected to the output terminal b61 of the drive unit 610. The relay unit 620 is used to receive the level signal output by the drive unit 610 and control the state of the first contact switch and the second contact switch. The relay unit includes a relay, and the first and second contact switches are contact switches of the relay. The relay contacts close or open according to the energization of the relay coil. The driving signal output by the second output terminal b2 of the signal generation module 110 can be a pulse signal. For example, when the second output terminal b2 of the signal generation module 110 outputs a pulse signal, the level signal output by the driving unit 610 is high level, and when the second output terminal b2 of the signal generation module 110 does not output a pulse signal, the level signal output by the driving unit 610 is low level.

[0047] Figure 7 is a circuit diagram of a multi-output mode power supply circuit provided in an embodiment of the present invention. As shown in Figure 7, the multi-output mode power supply circuit includes a signal generation module 110, a signal buffer module 310, a power amplification module 120, a feedback resistor module 130, and a feedback resistor switching control module 140. The driving unit 610 of the feedback resistor switching control module 140 includes a fifth transistor Q5, an eighteenth resistor module R18, and a nineteenth resistor module R19. The base of the fifth transistor Q5 is connected to one end of the eighteenth resistor module R18 and one end of the nineteenth resistor module R19. The other end of the eighteenth resistor module R18 is connected to the input terminal a61 of the driving unit 610. The other end of the nineteenth resistor module R19 is connected to the emitter of the fifth transistor Q5. The emitter of the fifth transistor Q5 is grounded, and the collector of the fifth transistor Q5 is connected to the output terminal b61 of the driving unit 610. The relay unit 620 includes a relay coil T and a third diode D3; the anode of the third diode D3 is connected to the input terminal a62 of the relay unit 620, the cathode of the third diode D3 is connected to the fourth power supply V4, and the relay coil T is connected in parallel across the two ends of the third diode D3.

[0048] In this embodiment, the fifth transistor Q5 is turned on or off according to the received drive signal. Referring to the above embodiment, when the second output terminal b2 of the signal generation module 110 outputs a pulse signal, the level signal output by the drive unit 610 is high. At this time, the fifth transistor Q5 is turned on, the relay coil of the relay unit 620 is energized, the first contact switch and the second contact switch of the relay unit 620 are closed, and the fourteenth resistor module R14, the fifteenth resistor module R15, the sixteenth resistor module R16 and the seventeenth resistor module R17 in the feedback resistor module 130 are connected to the power amplifier module 120. At this time, the power amplifier module 120 operates in current amplification mode. When the second output terminal b2 of the signal generation module 110 does not output a pulse signal, the level signal output by the drive unit 610 is low. At this time, the fifth transistor Q5 is cut off, the relay coil of the relay unit 620 is de-energized, the first contact switch and the second contact switch of the relay unit 620 are disconnected, and the fourteenth resistor module R14 in the feedback resistor module 130 is connected to the power amplifier module 120. At this time, the power amplifier module 120 operates in voltage amplification mode.

[0049] In this embodiment, the signal generation module 110 uses DDS technology to output various forms of voltage control signals. The feedback resistor switching module 140 controls the switching of the feedback resistor in the feedback resistor module 130 according to the received drive signal, thereby changing the feedback resistor connected to the power amplifier module 120 and controlling the power amplifier module to operate in current amplification mode or voltage amplification mode. In the multi-output power supply circuit, the voltage control signal output by the signal generation module 110 passes through the power amplifier module 120 in different operating states, realizing the multi-output mode of the power supply circuit.

[0050] Based on the above embodiments, this embodiment provides a testing device including a power supply circuit with multiple output modes. The testing device is used to inject various excitation signals into the object under test (DUT), where the excitation signals include specific voltage or current signals. The testing device detects the feedback signal (i.e., response signal) of the DUT under the excitation signal and infers the performance of the DUT by analyzing the transmission characteristics from excitation to response. When testing a current transformer, the testing device needs to output various forms of excitation signals. For example, when testing the DC resistance of a current transformer, the testing device needs to output a constant DC current to the current transformer under test; when testing the transformation ratio of a current transformer, the testing device needs to output a stable AC voltage to the current transformer under test; when testing the volt-ampere characteristic of a current transformer, the testing device needs to output a continuously varying AC voltage to the current transformer under test; and when testing the load of a current transformer, the testing device needs to output a constant AC current signal to the secondary load of the current transformer.

[0051] In this embodiment, a multi-output power supply circuit is applied to the test equipment, enabling the test equipment to meet the comprehensive testing needs of devices such as current transformers, while improving the functional integration of the test equipment and reducing its weight and size.

[0052] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0053] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A power supply circuit with multiple output modes, characterized in that, The system includes a signal generation module, a power amplification module, a feedback resistor module, and a feedback resistor switching control module. The signal generation module has a first output terminal and a second output terminal. The signal generation module outputs a voltage control signal through the first output terminal and a drive signal through the second output terminal. The power amplification module has a first input terminal connected to its first output terminal and is used to amplify current or voltage based on the input signal at its first input terminal. The feedback resistor module has a first terminal connected to its first feedback terminal, a second terminal connected to its second feedback terminal, a third terminal connected to its first input terminal, and a fourth terminal connected to its second input terminal. The feedback resistor module is used to connect a feedback resistor to the power amplification module, wherein the first feedback terminal is the output terminal of the power amplification module. The feedback resistor switching control module has an input terminal connected to the second output terminal of the signal generation module and an output terminal connected to the control terminal of the feedback resistor module. The feedback resistor switching control module is used to control the power amplification module based on the received drive signal. Switching the feedback resistor in the feedback resistor module changes the feedback resistor connected to the power amplifier module, controlling the power amplifier module to operate in current amplification mode or voltage amplification mode. The voltage control signal output from the first output terminal of the signal generation module includes a positive DC signal, a negative DC signal, an AC signal with continuously varying amplitude, and an AC signal with continuously varying frequency. The positive DC signal or the negative DC signal is input to the power amplifier module as the voltage control signal. When the power amplifier module operates in current amplification mode, the multi-output mode power supply circuit acts as a DC constant current power supply. The AC signal with continuously varying amplitude... The signal is input to the power amplifier module as the voltage control signal. When the power amplifier module operates in current amplification mode, the power supply circuit of the multi-output mode acts as an AC constant current power supply. The AC signal with continuously varying amplitude is input to the power amplifier module as the voltage control signal. When the power amplifier module operates in voltage amplification mode, the power supply circuit of the multi-output mode acts as an AC voltage source. The AC signal with continuously varying frequency is input to the power amplifier module as the voltage control signal. When the power amplifier module operates in voltage amplification mode, the power supply circuit of the multi-output mode acts as a frequency conversion voltage source.

2. The power supply circuit with multiple output modes according to claim 1, characterized in that, The signal generation module includes a microprocessor and a digital-to-analog converter (DAC). The microprocessor outputs a digital signal, and the DAC is connected to the microprocessor and receives the digital signal output by the microprocessor. The output terminal of the DAC is connected to the first output terminal of the signal generation module. The DAC is used to convert the received digital signal into an analog signal and output the analog signal through the output terminal.

3. The power supply circuit with multiple output modes according to claim 1, characterized in that, It also includes a signal buffer module, the input of which is connected to the first output of the signal generation module, and the output of which is connected to the first input of the power amplifier module. The signal buffer module is used to buffer the input voltage control signal.

4. The power supply circuit with multiple output modes according to claim 3, characterized in that, The signal buffer module includes a first operational amplifier, a first resistor module, a second resistor module, a third resistor module, a fourth resistor module, and a first capacitor. The negative input terminal of the first operational amplifier is connected to one end of the first resistor module, one end of the second resistor module, one end of the third resistor module, and one end of the first capacitor. The other end of the first resistor module is connected to the input terminal of the signal buffer module. The other end of the second resistor module is connected to the output terminal of the first operational amplifier. The other end of the third resistor module is grounded. The other end of the first capacitor is connected to the output terminal of the first operational amplifier. The positive input terminal of the first operational amplifier is connected to one end of the fourth resistor module. The other end of the fourth resistor module is grounded. The output terminal of the first operational amplifier is connected to the output terminal of the signal buffer module.

5. The power supply circuit with multiple output modes according to claim 3, characterized in that, The power amplifier module includes a second operational amplifier, a fifth resistor module, a sixth resistor module, a seventh resistor module, an eighth resistor module, a ninth resistor module, a tenth resistor module, an eleventh resistor module, a twelfth resistor module, a thirteenth resistor module, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a first transistor, a second transistor, a third transistor, and a fourth transistor. The positive input terminal of the second operational amplifier is connected to one end of the fifth resistor module, and the other end of the fifth resistor module is grounded. The negative input terminal of the second operational amplifier is connected to one end of the sixth resistor module, and the other end of the sixth resistor module is connected to the output terminal of the signal buffer module. The second capacitor is connected between the output terminal and the negative input terminal of the second operational amplifier. The output terminal of the second operational amplifier is connected to one end of the seventh resistor module, and the other end of the seventh resistor module is connected to one end of the eighth resistor module and the anode of the first diode. The other end of the eighth resistor module is connected to the cathode of the second diode. The anode of the second diode is connected to the base of the first transistor. The ninth resistor module and the third capacitor are connected in parallel between the base and collector of the first transistor. The collector of the first transistor is connected to a first power supply. The transmitter of the first transistor is connected to the base of the second transistor. The collector of the second transistor is connected to the first power supply. The emitter of the second transistor is connected to one end of the tenth resistor module. The cathode of the first diode is connected to the base of the third transistor. The eleventh resistor module and the fourth capacitor are connected in parallel between the base and collector of the third transistor. The collector of the third transistor is connected to a second power supply. The emitter of the third transistor is connected to the base of the fourth transistor. The collector of the fourth transistor is connected to the second power supply. The emitter of the fourth transistor is connected to one end of the twelfth resistor module. The other end of the twelfth resistor module is connected to the other end of the tenth resistor module and one end of the thirteenth resistor module. The other end of the thirteenth resistor module is connected to the output terminal of the power amplifier module.

6. The power supply circuit with multiple output modes according to claim 1, characterized in that, The feedback resistor switching control module includes a first control switch and a second control switch; the feedback resistor switching control module is used to control the first control switch and the second control switch to be turned on or off according to the drive signal output by the signal generation module; the feedback resistor module includes a fourteenth resistor module, a fifteenth resistor module, a sixteenth resistor module, and a seventeenth resistor module; one end of the fourteenth resistor module and one end of the first control switch are connected to the first end of the feedback resistor module, the other end of the fourteenth resistor module is connected to the third end of the feedback resistor module, the other end of the first control switch is connected to one end of the fifteenth resistor module, the other end of the fifteenth resistor module is connected to the third end of the feedback resistor module, one end of the second control switch is connected to the second end of the feedback resistor module, the other end of the second control switch is connected to one end of the sixteenth resistor module and one end of the seventeenth resistor module, and the other ends of the sixteenth resistor module and the seventeenth resistor module are connected to the fourth end of the feedback resistor module.

7. The power supply circuit with multiple output modes according to claim 6, characterized in that, The feedback resistor switching control module includes a drive unit and a relay unit; the relay unit includes a first contact switch and a second contact switch, which serve as the first control switch and the second control switch, respectively; the input terminal of the drive unit is connected to the second output terminal of the signal generation module, and the drive unit is used to generate a level signal according to the drive signal output by the second output terminal of the signal generation module; the input terminal of the relay unit is connected to the output terminal of the drive unit, and the relay unit is used to receive the level signal output by the drive unit and control the state of the first contact switch and the second contact switch.

8. The power supply circuit with multiple output modes according to claim 7, characterized in that, The driving unit includes a fifth transistor, an eighteenth resistor module, and a nineteenth resistor module; the base of the fifth transistor is connected to one end of the eighteenth resistor module and one end of the nineteenth resistor module, the other end of the eighteenth resistor module is connected to the input terminal of the driving unit, the other end of the nineteenth resistor module is connected to the emitter of the fifth transistor, the emitter of the fifth transistor is grounded, and the collector of the fifth transistor is connected to the output terminal of the driving unit.

9. The power supply circuit with multiple output modes according to claim 8, characterized in that, The relay unit includes a relay coil and a third diode; the anode of the third diode is connected to the input terminal of the relay unit, the cathode of the third diode is connected to a fourth power supply, and the relay coil is connected in parallel across the two ends of the third diode.

10. A testing device, characterized in that, The test equipment includes a power supply circuit with multiple output modes as described in any one of claims 1-9.

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