Equipotential symmetric high-voltage source generation circuit

Abstract

The invention discloses an equipotential symmetrical high-voltage source generating circuit which comprises a signal switching circuit, a reference power supply circuit, a push-pull power amplifier first-stage circuit, a push-pull power amplifier second-stage circuit and an overcurrent protection circuit, the signal switching circuit is connected with the reference power supply circuit, the reference power supply circuit is connected with the push-pull power amplifier first-stage circuit, and the push-pull power amplifier second-stage circuit is connected with the overcurrent protection circuit. The push-pull power amplifier first-stage circuit is connected with the push-pull power amplifier second-stage circuit, and the push-pull power amplifier second-stage circuit is connected with the overcurrent protection circuit. The circuit provided by the invention can generate equipotential symmetrical high voltage. The circuit is provided with two equipotential output ends, one output end serves as a grounding end of an isolated power supply, the other output end is connected with a protection end A-GDF besides serving as a high-voltage output end, and the output ends are used for preventing static electricity or noise from influencing a chip, so that the stability and the reliability of the circuit are improved. The circuit is simple in design, can output equipotential symmetrical high-voltage signals, and greatly improves the stability and reliability of the circuit.

Description

Technical Field

[0001] The invention relates to an equipotential symmetrical high-voltage source generating circuit. Background Art

[0002] In the fields of power systems, medical equipment, scientific research, etc., stable and reliable high-voltage sources are needed to drive various equipment and experiments. Traditional high-voltage sources are greatly affected by factors such as the environment and power supply fluctuations during operation, resulting in large fluctuations in output voltage and poor stability, which is not conducive to the development needs of modern science and technology and industry. Therefore, innovative technologies and designs are needed to solve these problems and improve the performance and stability of high-voltage sources. Summary of the invention

[0003] The present invention provides an equipotential symmetrical high voltage source generation circuit to solve the problems existing in the above-mentioned prior art. The circuit of the present invention can generate equipotential symmetrical high voltage. There are two equipotential output terminals in the circuit, one of which is used as the ground terminal of the isolated power supply, and the other is not only used as the high voltage output terminal but also connected to the protection terminal A-GDF to prevent static electricity or noise from affecting the chip, thereby improving the stability and reliability of the circuit.

[0004] The technical solutions adopted in the present invention are: A circuit for generating an equipotential symmetrical high-voltage source comprises a signal switching circuit, a reference power supply circuit, a first-stage push-pull power amplifier circuit, a second-stage push-pull power amplifier circuit and an overcurrent protection circuit, wherein the signal switching circuit is connected to the reference power supply circuit, the reference power supply circuit is connected to the first-stage push-pull power amplifier circuit, the first-stage push-pull power amplifier circuit is connected to the second-stage push-pull power amplifier circuit, and the second-stage push-pull power amplifier circuit is connected to the overcurrent protection circuit.

[0005] Furthermore, the push-pull power amplifier first stage circuit and the push-pull power amplifier second stage circuit form a push-pull power amplifier, and the output of the push-pull power amplifier includes an output point F-OUT1 and a floating ground F-COM, and the two have the same potential.

[0006] Furthermore, the generating circuit also includes a circuit protector, which includes an inner shielding layer, an outer shielding layer and a core wire, the inner shielding layer is coaxially arranged in the outer shielding layer, and the core wire passes through the circuit protector along the axial direction of the inner shielding layer; The outer wall of the inner shielding layer forms a protection end A-GDF, and the outer wall of the outer shielding layer is grounded. The output point F-OUT1 is divided into two output paths, one path is connected to the protection terminal A-GDF, and the other path is connected to the total output F-OUT of the generating circuit through a core wire.

[0007] Furthermore, the signal switching circuit includes a signal switching switch S, a first relay K1, a second relay K2, a first diode D1, a second diode D2, a first resistor R1 and a second resistor R2, wherein the common end of the 4th pin of the first relay K1 and the cathode of the first diode D1 are both connected to one terminal of the signal switching switch S, and the common end of the 4th pin of the second relay K2 and the cathode of the second diode D2 are connected to the other terminal of the signal switching switch S; The 3rd pin of the first relay K1 is connected to the positive input signal Ui+, and the 3rd pin of the second relay K2 is connected to the negative input signal Ui-. Pin 2 of the first relay K1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is grounded; Pin 2 of the second relay K2 is connected to one end of the first resistor R2, and the other end of the first resistor R2 is grounded; The 6th pin of the first relay K1 is connected to the 7th pin of the first relay K1 as a common terminal, which is connected to the positive input terminal of the reference power supply circuit; the 6th pin of the second relay K2 is connected to the 7th pin of the second relay K2 as a common terminal, which is connected to the negative input terminal of the reference power supply circuit; Pin 1 of the first relay K1 and the second relay K2 are connected to the protection terminal A-GDF, and the remaining pins of the first relay K1 and the second relay K2, as well as the anode of the first diode D1 and the anode of the second diode D2 are connected to the floating ground F-COM.

[0008] Furthermore, the first resistor R1 and the second resistor R2 are resistors with a power of 1-3W.

[0009] Further, the overcurrent protection circuit includes a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a fifteenth resistor R15, a sixteenth resistor R16, a twenty-third resistor R23, a twenty-fourth resistor R24, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6. One end of the fourth capacitor C4 is connected to one end of the fifteenth resistor R15 and the anode of the third diode D3. One end of the fifth capacitor C5 is connected to one end of the sixteenth resistor R16 and the cathode of the fourth diode D4. The other end of the fourth capacitor C4, the other end of the fifteenth resistor R15, the cathode of the third diode D3, the other end of the fifth capacitor C5, the other end of the sixteenth resistor R16, and the anode of the fourth diode D4 are commonly connected to the floating ground F-COM; One end of the sixth capacitor C6 is connected to one end of the twenty-third resistor R23 and the anode of the fifth diode D5. One end of the seventh capacitor C7 is connected to one end of the twenty-fourth resistor R24 ​​and the cathode of the sixth diode D6. The other end of the sixth capacitor C6, the other end of the twenty-third resistor R23, the cathode of the fifth diode D5, the other end of the seventh capacitor C7, the other end of the twenty-fourth resistor R24, and the anode of the sixth diode D6 are commonly connected to the output point F-OUT1.

[0010] Furthermore, the reference power supply circuit 2 includes a third resistor R3, a fourth resistor R4, a first capacitor C1 and a voltage reference module U1, one end of the third resistor R3, one end of the first capacitor C1 and the cathode end of the voltage reference module U1 are connected to the signal switching circuit as the positive end of the input signal, one end of the fourth resistor R4, the other end of the first capacitor C1 and the anode end of the voltage reference module U1 are connected to the signal switching circuit as the negative end of the input signal, and the other ends of the third resistor R3 and the fourth resistor R4 are connected and connected to the reference voltage input terminal REF of the voltage reference module U1.

[0011] Furthermore, the seventh resistor R7 and the eighth resistor R8 are resistors with a power of 1-3W.

[0012] Furthermore, the push-pull amplifier first stage circuit 3 includes a first transistor Q1, a second transistor Q2, a fifth resistor R5, a sixth resistor R6, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. One end of the tenth resistor R10 is connected to the collector of the first transistor Q1. One end of the fifth resistor R5 is connected to the base of the first transistor Q1, and one end of the sixth resistor R6 is connected to the base of the second transistor Q2. One end of the twelfth resistor R12 is connected to the collector of the second transistor Q2. One end of the eleventh resistor R11 is connected to the emitter of the first transistor Q1 and then to the positive input end of the second stage circuit of the push-pull amplifier. The other end of the eleventh resistor R11 is connected to the emitter of the second transistor Q2 and then to the negative input end of the second stage circuit of the push-pull power amplifier.

[0013] Further, the push-pull amplifier second stage circuit 4 includes a fourteenth resistor R14, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-fifth resistor R25, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6, One end of the fourteenth resistor R14 is connected to the collector of the third transistor Q3, one end of the twenty-second resistor R22 is connected to the collector of the fifth transistor Q5, and the other end of the fourteenth resistor R14 is connected to the other end of the twenty-second resistor R22 and then connected to a positive 5V isolated power supply; One end of the eighteenth resistor R18 is connected to the base of the third transistor Q3, one end of the twentieth resistor R20 is connected to the base of the fifth transistor Q5, and the other end of the eighteenth resistor R18 is connected to the other end of the twentieth resistor R20 and then connected to the first stage circuit of the push-pull power amplifier as the positive input end of the second stage circuit of the push-pull power amplifier; One end of the seventeenth resistor R17 is connected to the collector of the fourth transistor Q4, one end of the twenty-fifth resistor R25 is connected to the collector of the sixth transistor Q6, and the other end of the seventeenth resistor R17 is connected to the other end of the twenty-fifth resistor R25 and then connected to a negative 5V isolated power supply; One end of the nineteenth resistor R19 is connected to the base of the fourth transistor Q4, one end of the twenty-first resistor R21 is connected to the base of the sixth transistor Q6, and the other end of the nineteenth resistor R19 is connected to the other end of the twenty-first resistor R21 and then connected to the first stage circuit of the push-pull amplifier as the negative input terminal of the second stage circuit of the push-pull amplifier.

[0014] The present invention pushes and pulls the signal after changing the potential of the input adjustable voltage signal, thereby obtaining an equipotential symmetrical high-voltage signal. Compared with the prior art, the present invention has the following advantages: the circuit design is simple, and the equipotential symmetrical high-voltage signal can be output, which greatly improves the stability and reliability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a circuit diagram of the present invention.

[0016] Figure 2 This is the circuit protector structure diagram. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] like Figure 1 The present invention discloses an equipotential symmetrical high-voltage source generating circuit, comprising a signal switching circuit, a reference power supply circuit, a push-pull power amplifier first-stage circuit, a push-pull power amplifier second-stage circuit and an overcurrent protection circuit. The signal switching circuit is connected to the reference power supply circuit, the reference power supply circuit is connected to the push-pull power amplifier first-stage circuit, the push-pull power amplifier first-stage circuit is connected to the push-pull power amplifier second-stage circuit, and the push-pull power amplifier second-stage circuit is connected to the overcurrent protection circuit.

[0019] The signal switching circuit is used to switch the positive and negative of the input signal, and the reference power supply circuit is used to configure a stable output to ensure that the subsequent power transistor can be stably driven.

[0020] The first stage circuit of the push-pull power amplifier and the second stage circuit of the push-pull power amplifier form a push-pull power amplifier. The output of the push-pull power amplifier includes an output point F-OUT1 and a floating ground F-COM, and the two have the same potential.

[0021] The first stage circuit of the push-pull amplifier acts as the driving circuit of the push-pull amplifier, amplifying the collector current to meet the driving requirements, and at the same time ensuring the coordination of the conduction and cutoff timing of the two different types of output tubes in the subsequent stage to avoid cross-adjustment; the second stage circuit of the push-pull amplifier acts as the output circuit of the push-pull amplifier to provide the required power output, while reducing distortion and improving the efficiency and performance of the power amplifier. The overcurrent protection circuit ensures that the current on the precision resistor does not exceed the set rated current.

[0022] like Figure 2 The generating circuit also includes a circuit protector, which includes an inner shielding layer, an outer shielding layer and a core wire. The inner shielding layer is coaxially arranged in the outer shielding layer, and the core wire passes through the circuit protector along the axial direction of the inner shielding layer. The outer wall of the inner shielding layer forms a protection end A-GDF, and the outer wall of the outer shielding layer is grounded. The output point F-OUT1 is divided into two outputs, one of which is connected to the protection end A-GDF, and the other is connected to the total output F-OUT of the generating circuit through the core wire.

[0023] The protection terminal A-GDF is formed by the output terminal of F-OUT1 through a voltage follower composed of an operational amplifier. F-OUT, as the output terminal of this circuit, is directly led out from F-OUT1.

[0024] The signal switching circuit includes a signal switching switch S, a first relay K1, a second relay K2, a first diode D1, a second diode D2, a first resistor R1, and a second resistor R2.

[0025] The two terminals of the signal switching switch S are respectively connected to the common end of the 4th pin of the first relay K1 (the first end of the coil) and the cathode of the first diode D1 and the common end of the 4th pin of the second relay K2 (the first end of the coil) and the cathode of the second diode D2.

[0026] Pin 3 of the first relay K1 (the first end of the normally open contact) is connected to the positive input signal Ui+; Pin 3 of the second relay K2 (the first end of the normally open contact) is connected to the negative input signal Ui-.

[0027] Pin 2 of the first relay K1 (the first end of the normally closed contact) is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to GND; Pin 2 of the second relay K2 (a first end of a normally closed contact) is connected to one end of the first resistor R2, and the other end of the first resistor R2 is connected to GND.

[0028] The 6th foot of the first relay K1 (the second end of the normally open contact) and the 7th foot of the first relay K1 (the second end of the normally closed contact) are connected as a common end to the positive input end of the reference power supply circuit; The 6th foot of the second relay K2 (the second end of the normally open contact) and the 7th foot of the second relay K2 (the second end of the normally closed contact) are connected as a common end to the negative input end of the reference power supply circuit.

[0029] Pin 1 of the first relay K1 and the second relay K2 are connected to the protection terminal A-GDF together, and the remaining pin 8 of the first relay K1, pin 5 of the first relay K1 (the second end of the coil), pin 9 of the first relay K1 (relay housing), the anode of the first diode D1, pin 8 of the second relay K2, pin 5 of the second relay K2 (the second end of the coil), pin 9 of the second relay K2 (relay housing), and the anode of the second diode D2 are connected to F-COM together.

[0030] The signal switching circuit selects one of the coils of the two high-voltage relays K1 and K2 to be energized through the signal switching switch S, so that its normally open and normally closed contacts are actuated. When the switch is connected to the upper end, when the coil of the high-voltage relay K1 is energized, the positive input terminal of the reference power supply circuit is connected to the positive input signal. When the switch is connected to the lower end, when the coil of the high-voltage relay K2 is energized, the negative input terminal of the reference power supply circuit is connected to the negative input signal. The positive and negative input signals can be selected through the signal switching switch.

[0031] The reference power supply circuit includes a third resistor R3, a fourth resistor R4, a first capacitor C1 and a voltage reference module U1.

[0032] One end of the third resistor R3, one end of the first capacitor C1 and the cathode end of the voltage reference module U1 are connected to the positive output end of the signal switching circuit. One end of the fourth resistor R4, the other end of the first capacitor C1 and the anode end of the voltage reference module U1 are connected to the negative output end of the signal switching circuit. The other ends of the third resistor R3 and the fourth resistor R4 are connected to the reference voltage input end REF of the voltage reference module U1.

[0033] The reference power supply circuit determines the stable output value by configuring the resistor bridge R3 and R4, ensuring that its output voltage can stably drive the power transistors of the subsequent stage, so that the output stage transistors are at the appropriate operating point during operation, making the transition between the closing and the conducting of the subsequent stage transistors smoother, thereby reducing crossover distortion.

[0034] The push-pull amplifier first stage circuit 3 includes a first transistor Q1, a second transistor Q2, a fifth resistor R5, a sixth resistor R6, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12.

[0035] One end of the tenth resistor R10 is connected to the collector of the first transistor Q1, and one end of the fifth resistor R5 is connected to the base of the first transistor Q1; one end of the sixth resistor R6 is connected to the base of the second transistor Q2, and one end of the twelfth resistor R12 is connected to the collector of the second transistor Q2; one end of the eleventh resistor R11 is connected to the emitter of the first transistor Q1 and then connected to the positive input terminal of the second stage circuit of the push-pull power amplifier, and the other end of the eleventh resistor R11 is connected to the emitter of the second transistor Q2 and then connected to the negative input terminal of the second stage circuit of the push-pull power amplifier.

[0036] The first-stage circuit of the push-pull amplifier serves as the driving circuit of the push-pull amplifier. It can amplify the collector current to meet the driving requirements of the next-stage power tube. At the same time, the first-stage transistor can ensure that the timing of the conduction and cutoff of the two different types of output tubes in the subsequent stage are coordinated, thereby avoiding cross-adjustment.

[0037] The push-pull amplifier second stage circuit 4 includes a fourteenth resistor R14, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-fifth resistor R25, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6.

[0038] One end of the fourteenth resistor R14 is connected to the collector of the third transistor Q3, one end of the twenty-second resistor R22 is connected to the collector of the fifth transistor Q5, and the other end of the fourteenth resistor R14 is connected to the other end of the twenty-second resistor R22 and then connected to the positive 5V isolated power supply. One end of the eighteenth resistor R18 is connected to the base of the third transistor Q3, one end of the twentieth resistor R20 is connected to the base of the fifth transistor Q5, and the other end of the eighteenth resistor R18 is connected to the other end of the twentieth resistor R20 and then connected to the first stage circuit of the push-pull power amplifier as the positive input end of the second stage circuit of the push-pull power amplifier.

[0039] Similarly, one end of the seventeenth resistor R17 is connected to the collector of the fourth transistor Q4, one end of the twenty-fifth resistor R25 is connected to the collector of the sixth transistor Q6, and the other end of the seventeenth resistor R17 is connected to the other end of the twenty-fifth resistor R25 and then connected to the negative 5V isolated power supply.

[0040] One end of the nineteenth resistor R19 is connected to the base of the fourth transistor Q4, one end of the twenty-first resistor R21 is connected to the base of the sixth transistor Q6, and the other end of the nineteenth resistor R19 is connected to the other end of the twenty-first resistor R21 and then connected to the first stage circuit of the push-pull amplifier as the negative input terminal of the second stage circuit of the push-pull amplifier.

[0041] As the output circuit of the push-pull power amplifier, the second-stage circuit of the push-pull power amplifier not only provides the required power output, but also reduces distortion and improves the efficiency and performance of the power amplifier through phase sharing and other means.

[0042] The overcurrent protection circuit 5 includes: a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a fifteenth resistor R15, a sixteenth resistor R16, a twenty-third resistor R23, a twenty-fourth resistor R24, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6.

[0043] One end of the fourth capacitor C4 is connected to one end of the fifteenth resistor R15 and the anode of the third diode D3, one end of the fifth capacitor C5 is connected to one end of the sixteenth resistor R16 and the cathode of the fourth diode D4, and the other end of the remaining fourth capacitor C4, the other end of the fifteenth resistor R15, the cathode of the third diode D3, the other end of the fifth capacitor C5, the other end of the sixteenth resistor R16, and the anode of the fourth diode D4 are commonly connected to the floating ground F-COM.

[0044] One end of the sixth capacitor C6 is connected to one end of the twenty-third resistor R23 and the anode of the fifth diode D5, one end of the seventh capacitor C7 is connected to one end of the twenty-fourth resistor R24 ​​and the cathode of the sixth diode D6, and the other end of the remaining sixth capacitor C6, the other end of the twenty-third resistor R23, the cathode of the fifth diode D5, the other end of the seventh capacitor C7, the other end of the twenty-fourth resistor R24, and the anode of the sixth diode D6 are commonly connected to the output point F-OUT1.

[0045] The overcurrent protection circuit mainly utilizes the conduction characteristics of the diode. After connecting several diodes in series, they are connected in parallel on the precision resistor to be protected. When the current on the resistor exceeds the set rated current, the diodes connected in parallel at both ends conduct forward to form a low-impedance path, ensuring that the current on the precision resistor does not exceed the set rated current.

[0046] High-voltage relays K1 and K2 each have a set of normally open contacts and a set of normally closed contacts. When the coil is energized, the normally open contacts close and the normally closed contacts open.

[0047] The freewheeling diodes D1 and D2 are standard rectifier diodes, which require that the reverse voltage of the diodes must be higher than the supply voltage of the relay coil. The freewheeling diodes can protect the drive circuit from the reverse electromotive force impact generated when the relay coil is powered off.

[0048] High-voltage resistors R1, R2, R7, and R8 are high-power resistors with a power of 1-3W. The resistors can withstand higher voltages without being broken down or failing.

[0049] The positive 15V isolated power supply, negative 15V isolated power supply, positive 5V isolated power supply and negative 5V isolated power supply are used as the driving power supply of the entire push-pull power amplifier circuit, providing the required current and voltage for the first and second stages of the push-pull power amplifier to ensure that the output tube can work in the appropriate working area, thereby achieving the amplification of the input signal. At the same time, the positive 5V isolated power supply is also used as the control power supply of the coil of the high-voltage relay, and the positive 15V isolated power supply and negative 15V isolated power supply are used as the driving power supply of the operational amplifier.

[0050] The voltage reference module U1 adjusts the cathode voltage to the determined regulation voltage, and can output a stable voltage value according to the ratio of the configured resistance bridge, ensuring that the input end of the push-pull amplifier can obtain a stable power supply voltage.

[0051] The circuit of the present invention can generate equipotential symmetrical high-voltage signals. When appropriate high potentials are input to the input ports Ui+ and Ui-, two equipotential symmetrical high-voltage signals can be output at the F-COM terminal and the F-OUT1 port. The circuit solves the problem that the traditional high-voltage source is greatly affected by factors such as the environment and power supply fluctuations during operation, resulting in large output voltage fluctuations and poor stability. The circuit is composed of high-voltage relays (K1, K2), a voltage reference chip (U1), power amplifier tubes (Q1, Q2, Q3, Q4, Q5, Q6), high-voltage resistors (R1, R2, R7, R8) and diodes, and has high performance and stability.

[0052] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. An equipotential symmetrical high voltage source generating circuit, characterized in that: It includes a signal switching circuit, a reference power supply circuit, a push-pull power amplifier first-stage circuit, a push-pull power amplifier second-stage circuit and an overcurrent protection circuit. The signal switching circuit is connected to the reference power supply circuit, the reference power supply circuit is connected to the push-pull power amplifier first-stage circuit, the push-pull power amplifier first-stage circuit is connected to the push-pull power amplifier second-stage circuit, and the push-pull power amplifier second-stage circuit is connected to the overcurrent protection circuit.

2. The equipotential symmetrical high voltage source generating circuit according to claim 1, characterized in that: The push-pull power amplifier first stage circuit and the push-pull power amplifier second stage circuit form a push-pull power amplifier, and the output of the push-pull power amplifier includes an output point F-OUT1 and a floating ground F-COM, and the two have the same potential.

3. The equipotential symmetrical high voltage source generating circuit according to claim 2, characterized in that: The generating circuit also includes a circuit protector, which includes an inner shielding layer, an outer shielding layer and a core wire, wherein the inner shielding layer is coaxially arranged in the outer shielding layer, and the core wire passes through the circuit protector along the axial direction of the inner shielding layer; The outer wall of the inner shielding layer forms a protection end A-GDF, and the outer wall of the outer shielding layer is grounded. The output point F-OUT1 is divided into two output paths, one path is connected to the protection terminal A-GDF, and the other path is connected to the total output F-OUT of the generating circuit through a core wire.

4. The equipotential symmetrical high voltage source generating circuit according to claim 3, characterized in that: The signal switching circuit includes a signal switching switch S, a first relay K1, a second relay K2, a first diode D1, a second diode D2, a first resistor R1 and a second resistor R2, wherein the common end of the 4th pin of the first relay K1 and the cathode of the first diode D1 are both connected to one terminal of the signal switching switch S, and the common end of the 4th pin of the second relay K2 and the cathode of the second diode D2 are connected to the other terminal of the signal switching switch S; The 3rd pin of the first relay K1 is connected to the positive input signal Ui+, and the 3rd pin of the second relay K2 is connected to the negative input signal Ui-. Pin 2 of the first relay K1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is grounded; Pin 2 of the second relay K2 is connected to one end of the first resistor R2, and the other end of the first resistor R2 is grounded; The 6th pin of the first relay K1 is connected to the 7th pin of the first relay K1 as a common terminal, which is connected to the positive input terminal of the reference power supply circuit; the 6th pin of the second relay K2 is connected to the 7th pin of the second relay K2 as a common terminal, which is connected to the negative input terminal of the reference power supply circuit; Pin 1 of the first relay K1 and the second relay K2 are connected to the protection terminal A-GDF, and the remaining pins of the first relay K1 and the second relay K2, as well as the anode of the first diode D1 and the anode of the second diode D2 are connected to the floating ground F-COM.

5. The equipotential symmetrical high voltage source generating circuit according to claim 4, characterized in that: The first resistor R1 and the second resistor R2 are resistors with a power of 1-3W.

6. The equipotential symmetrical high voltage source generating circuit according to claim 3, characterized in that: The overcurrent protection circuit includes a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a fifteenth resistor R15, a sixteenth resistor R16, a twenty-third resistor R23, a twenty-fourth resistor R24, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6. One end of the fourth capacitor C4 is connected to one end of the fifteenth resistor R15 and the anode of the third diode D3. One end of the fifth capacitor C5 is connected to one end of the sixteenth resistor R16 and the cathode of the fourth diode D4. The other end of the fourth capacitor C4, the other end of the fifteenth resistor R15, the cathode of the third diode D3, the other end of the fifth capacitor C5, the other end of the sixteenth resistor R16, and the anode of the fourth diode D4 are commonly connected to the floating ground F-COM; One end of the sixth capacitor C6 is connected to one end of the twenty-third resistor R23 and the anode of the fifth diode D5. One end of the seventh capacitor C7 is connected to one end of the twenty-fourth resistor R24 ​​and the cathode of the sixth diode D6. The other end of the sixth capacitor C6, the other end of the twenty-third resistor R23, the cathode of the fifth diode D5, the other end of the seventh capacitor C7, the other end of the twenty-fourth resistor R24, and the anode of the sixth diode D6 are commonly connected to the output point F-OUT1.

7. The equipotential symmetrical high voltage source generating circuit according to claim 1, characterized in that: The reference power supply circuit 2 includes a third resistor R3, a fourth resistor R4, a first capacitor C1 and a voltage reference module U1. One end of the third resistor R3, one end of the first capacitor C1 and the cathode end of the voltage reference module U1 are connected to the signal switching circuit as the positive end of the input signal. One end of the fourth resistor R4, the other end of the first capacitor C1 and the anode end of the voltage reference module U1 are connected to the signal switching circuit as the negative end of the input signal. The other ends of the third resistor R3 and the fourth resistor R4 are connected and connected to the reference voltage input terminal REF of the voltage reference module U1.

8. The equipotential symmetrical high voltage source generating circuit according to claim 7, characterized in that: The seventh resistor R7 and the eighth resistor R8 are resistors with a power of 1-3W.

9. The equipotential symmetrical high voltage source generating circuit according to claim 1, characterized in that: The push-pull amplifier first stage circuit 3 includes a first transistor Q1, a second transistor Q2, a fifth resistor R5, a sixth resistor R6, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. One end of the tenth resistor R10 is connected to the collector of the first transistor Q1. One end of the fifth resistor R5 is connected to the base of the first transistor Q1, and one end of the sixth resistor R6 is connected to the base of the second transistor Q2. One end of the twelfth resistor R12 is connected to the collector of the second transistor Q2. One end of the eleventh resistor R11 is connected to the emitter of the first transistor Q1 and then to the positive input end of the second stage circuit of the push-pull amplifier. The other end of the eleventh resistor R11 is connected to the emitter of the second transistor Q2 and then to the negative input end of the second stage circuit of the push-pull power amplifier.

10. The equipotential symmetrical high voltage source generating circuit according to claim 1, characterized in that: The push-pull amplifier second stage circuit 4 includes a fourteenth resistor R14, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-fifth resistor R25, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6. One end of the fourteenth resistor R14 is connected to the collector of the third transistor Q3, one end of the twenty-second resistor R22 is connected to the collector of the fifth transistor Q5, and the other end of the fourteenth resistor R14 is connected to the other end of the twenty-second resistor R22 and then connected to a positive 5V isolated power supply; One end of the eighteenth resistor R18 is connected to the base of the third transistor Q3, one end of the twentieth resistor R20 is connected to the base of the fifth transistor Q5, and the other end of the eighteenth resistor R18 is connected to the other end of the twentieth resistor R20 and then connected to the first stage circuit of the push-pull power amplifier as the positive input end of the second stage circuit of the push-pull power amplifier; One end of the seventeenth resistor R17 is connected to the collector of the fourth transistor Q4, one end of the twenty-fifth resistor R25 is connected to the collector of the sixth transistor Q6, and the other end of the seventeenth resistor R17 is connected to the other end of the twenty-fifth resistor R25 and then connected to a negative 5V isolated power supply; One end of the nineteenth resistor R19 is connected to the base of the fourth transistor Q4, one end of the twenty-first resistor R21 is connected to the base of the sixth transistor Q6, and the other end of the nineteenth resistor R19 is connected to the other end of the twenty-first resistor R21 and then connected to the first stage circuit of the push-pull amplifier as the negative input terminal of the second stage circuit of the push-pull amplifier.

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