A floating symmetrical power supply circuit for operational amplifiers with a wide voltage range

Abstract

The present invention discloses a wide-voltage-range op amp floating symmetrical power supply circuit, comprising a first op amp follower circuit, a second op amp follower circuit, a push-pull output circuit, a voltage stabilizing circuit, a voltage regulating circuit, and positive and negative power output circuits. The first op amp follower circuit is connected to the push-pull output circuit, which is connected to the voltage stabilizing circuit, which is connected to the second op amp follower circuit, which is connected to the voltage regulating circuit, which is connected to the positive and negative power output circuits. The present invention can achieve a floating voltage relative to an input power supply VB, can formulate and optimize the output power supply according to the requirements of a specific op amp circuit, and, combined with a protection circuit, improves the safety and reliability of the op amp power supply.

Description

Technical Field

[0001] The invention relates to an operational amplifier floating symmetrical power supply circuit with a wide voltage range. Background Art

[0002] With the continuous advancement of electronic technology, operational amplifiers (op amps) are increasingly used in fields such as signal processing, measurement, and control. However, traditional op amp power supply circuits often suffer from poor stability, high noise, and high power consumption, especially when processing complex and high-speed signals. Therefore, this invention proposes a novel floating symmetrical power supply circuit for op amps with a wide voltage range, aiming to address these issues and improve the performance and stability of op amps to meet the needs of op amp circuit systems. Summary of the Invention

[0003] The present invention aims to solve the above problems in the prior art and provides an operational amplifier floating symmetrical power supply circuit with a wide voltage range.

[0004] The technical solutions adopted in the present invention are:

[0005] An operational amplifier floating symmetrical power supply circuit with a wide voltage range includes a first operational amplifier follower circuit, a second operational amplifier follower circuit, a push-pull output circuit, a voltage stabilizing circuit, a voltage regulating circuit, and a positive and negative power supply output circuit.

[0006] The first operational amplifier follower circuit is connected to the push-pull output circuit, the push-pull output circuit is connected to the voltage stabilizing circuit, the voltage stabilizing circuit is connected to the second operational amplifier follower circuit, the second operational amplifier follower circuit is connected to the voltage regulating circuit, and the voltage regulating circuit is connected to the positive and negative power supply output circuits.

[0007] Furthermore, the first operational amplifier follower circuit includes an eleventh resistor R11, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11 and a second operational amplifier U2.

[0008] One end of the ninth capacitor C9 is connected to the floating ground F-COM, and the other end is connected to the eleventh resistor R11 and then connected to the non-inverting input terminal of the second operational amplifier U2.

[0009] The floating positive voltage +VCCF is connected to the positive power supply of the operational amplifier chip U2 and is connected in parallel with one end of the tenth capacitor C10. The other end of the tenth capacitor C10 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop;

[0010] The floating negative voltage -VEEF is connected to the negative power supply of the second operational amplifier U2 and is connected in parallel with one end of the eleventh capacitor C11. The other end of the eleventh capacitor C11 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop.

[0011] Furthermore, the second operational amplifier follower circuit includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a second resistor R2 and a first operational amplifier U1.

[0012] The floating positive voltage +VCCF is connected to the positive power supply of the first operational amplifier U1 and is connected in parallel with one end of the second capacitor C2. The other end of the second capacitor C2 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop;

[0013] The floating negative voltage -VEEF is connected to the negative power supply of the first operational amplifier U1 and is connected in parallel with one end of the third capacitor C3. The other end of the third capacitor C3 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop;

[0014] The inverting input terminal of the first operational amplifier U1 is connected to one end of the fourth capacitor C4, the other end of the fourth capacitor C4 is connected in parallel with the second resistor R2, one end of the fifth capacitor C5 is connected to the second resistor R2, and the other end is connected to the floating ground F-COM.

[0015] Furthermore, the push-pull output circuit includes

[0016] a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifth transistor T5, a fifteenth resistor R15, a sixteenth resistor R16, a sixth transistor T6, a twelfth capacitor C12, a thirteenth capacitor C13, and a first bidirectional diode CR1 consisting of a second-end diode and a third-end diode,

[0017] The first bidirectional diode CR1 is connected to the output terminal of the second operational amplifier U2.

[0018] The cathode of the second-end diode is connected to one end of the thirteenth resistor R13, and the anode of the third-end diode is connected to the base of the sixth transistor T6.

[0019] The other end of the thirteenth resistor R13 is connected to one end of the twelfth resistor R12 and the base of the fifth transistor T5.

[0020] One end of the fourteenth resistor R14 is connected to the base of the sixth transistor T6, and the other end is connected to the collector of the sixth transistor T6. The floating positive voltage +VCCF is connected to the collector of the sixth transistor T6 as a bias voltage of the sixth transistor T6.

[0021] A thirteenth capacitor C13, serving as a bias voltage filter capacitor, has one end connected to the collector of the sixth transistor T6 and the other end connected to the floating ground F-COM. The emitter of the sixth transistor T6 is connected to one end of a sixteenth resistor R16, and the other end of the sixteenth resistor R16 is connected to one end of a fifteenth resistor R15, serving as an output terminal for outputting the power supply VB.

[0022] The base of the fifth transistor T5 is connected to the thirteenth resistor R13 and the twelfth resistor R12 respectively, and the other end of the twelfth resistor R12 is connected to the collector of the fifth transistor T5.

[0023] The floating negative voltage -VEEF is connected to the collector of the fifth transistor T5 as the bias voltage of the fifth transistor T5.

[0024] The twelfth capacitor C12 is used as a bias voltage filter capacitor. One end of the twelfth capacitor is connected to the collector of the fifth transistor T5 and the other end is connected to the floating ground F-COM. The emitter of the fifth transistor T5 is connected to the fifteenth resistor R15.

[0025] Furthermore, the voltage stabilizing circuit includes a first voltage stabilizing diode DZ1, a second voltage stabilizing diode DZ2, a first resistor R1 and a first capacitor C1. The first voltage stabilizing diode DZ1 and the second voltage stabilizing diode DZ2 are connected in reverse series and in parallel with the first resistor R1. One end of the first resistor R1 is connected to the input power supply VB, and the other end is connected to the first capacitor C1. One end of the first capacitor C1 is connected to the floating ground F-COM, and the other end is connected to the second op amp follower circuit.

[0026] Furthermore, the voltage adjustment circuit includes positive voltage adjustment and negative voltage adjustment.

[0027] Furthermore, the positive voltage adjustment includes a third resistor R3, a third voltage regulator DZ3, a sixth capacitor C6, a first transistor T1, a seventh resistor R7 and a ninth resistor R9.

[0028] The third resistor R3 is connected to the anode of the third voltage-stabilizing tube DZ3, one end of the sixth capacitor C6 is connected to the third resistor R3, and the other end is connected to one end of the cathode of the third voltage-stabilizing tube DZ3, the collector of the first transistor T1 is connected to the cathode of the third voltage-stabilizing tube DZ3 and the other end of the sixth capacitor C6, the emitter of the first transistor T1 is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to the floating positive voltage +VCCF, the base of the first transistor T1 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the floating ground F-COM.

[0029] Furthermore, the negative voltage adjustment includes a fourth resistor R4, a fourth voltage-stabilizing diode DZ4, a seventh capacitor C7, a second transistor T2, an eighth resistor R8 and a tenth resistor R10, wherein the fourth resistor R4 is connected to one end of the cathode of the fourth voltage-stabilizing diode DZ4, one end of the seventh capacitor C7 is connected to the fourth resistor R4, and the other end is connected to one end of the anode of the fourth voltage-stabilizing diode DZ4, the collector of the second transistor T2 is connected to one end of the anode of the fourth voltage-stabilizing diode DZ4, and the other end of the seventh capacitor C7 is connected, the emitter of the second transistor T2 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the floating ground negative voltage -VEEF, the base of the second transistor T2 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the floating ground F-COM.

[0030] Furthermore, the positive and negative power supply output circuit includes a third transistor T3, a fifth resistor R5, an eighth capacitor C8, a fourth transistor T4 and a sixth resistor R6. The collector of the third transistor T3 is connected to the floating positive voltage +VCCF, the base of the third transistor T3 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the collector of the first transistor T1, the emitter of the third transistor T3 is connected to the other end of the eighth capacitor C8, and the positive power supply +VAF is output simultaneously. The collector of the fourth transistor T4 is connected to the floating negative voltage -VEEF, the base of the fourth transistor T4 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the collector of the second transistor T2, the emitter of the fourth transistor T4 is connected to the other end of the eighth capacitor C8, and the negative power supply -VAF is output simultaneously.

[0031] Two operational amplifier follower circuits are used to open the circuit in front when the input impedance is high, and to act as a constant voltage source in the rear when the output impedance is low, that is, the output voltage is not affected by the impedance of the rear circuit, providing isolation. The voltage stabilizing circuit is used to provide a stable input voltage by precisely controlling the current and voltage when a preset power input is used. The push-pull output circuit is used to achieve bidirectional push control of the output state of the load by turning the transistor on and off. The voltage adjustment circuit includes two symmetrical voltage adjustment units, respectively connected to the operational amplifier output terminal and the positive and negative power supply output terminals. The beneficial effects of this are: the power supply circuit has a floating design, and the floating symmetrical power supply can reduce the impact of power supply noise on the signal, thereby improving signal quality. It can meet the needs of operational amplifier circuit systems, especially those in high-voltage circuit environments, and has strong versatility and flexibility. Compared with the prior art, the present invention can achieve a floating voltage relative to the input power supply VB, can formulate and optimize the output power supply according to the needs of the specific operational amplifier circuit, and, combined with the protection circuit, improves the safety and reliability of the operational amplifier power supply. The operational amplifier floating symmetrical power supply circuit of the present invention provides a new solution for the design of operational amplifier power supplies for electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] like Figure 1 The present invention provides an operational amplifier floating symmetrical power supply circuit with a wide voltage range, comprising a first operational amplifier follower circuit, a second operational amplifier follower circuit, a push-pull output circuit, a voltage stabilizing circuit, a voltage regulating circuit and a positive and negative power supply output circuit. The first operational amplifier follower circuit is connected to the push-pull output circuit, the push-pull output circuit is connected to the voltage stabilizing circuit, the voltage stabilizing circuit is connected to the second operational amplifier follower circuit, the second operational amplifier follower circuit is connected to the voltage regulating circuit, and the voltage regulating circuit is connected to the positive and negative power supply output circuits.

[0035] The first op amp follower circuit includes an eleventh resistor R11, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, and a second op amp U2. The input voltage VIN is connected to the non-inverting input of the second op amp U2. One end of the ninth capacitor C9 is connected to the floating ground F-COM, and the other end is connected to the eleventh resistor R11. Both ends are connected to the non-inverting input of the second op amp U2. The floating positive voltage +VCCF is connected to the positive power supply of the op amp chip U2 and is connected in parallel with one end of the tenth capacitor C10. The other end of the tenth capacitor C10 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop. The floating negative voltage -VEEF is connected to the negative power supply of the second op amp U2 and is connected in parallel with one end of the eleventh capacitor C11. The other end of the eleventh capacitor C11 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop. The inverting input of the second op amp U2 is connected to the fifteenth resistor R15 and the sixteenth resistor R16.

[0036] The second op amp follower circuit includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a second resistor R2 and a first op amp U1. The floating positive voltage +VCCF is connected to the positive power supply of the first op amp U1 and is connected in parallel with one end of the second capacitor C2. The other end of the second capacitor C2 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop; the floating negative voltage -VEEF is connected to the negative power supply of the first op amp U1 and is connected in parallel with one end of the third capacitor C3. The other end of the third capacitor C3 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop; the reverse input end of the first op amp U1 is connected to one end of the fourth capacitor C4, the other end of the fourth capacitor C4 is connected in parallel with the second resistor R2, one end of the fifth capacitor C5 is connected to the second resistor R2, and the other end is connected to the floating ground F-COM.

[0037] The output terminals of the first and second op amps U1 and U2 have voltages equal to their inverting input terminals and are in phase. This circuit features high input impedance and low output impedance. When the input impedance is high, it acts as an open circuit for the preceding circuit. When the output impedance is low, it acts as a constant voltage source for the succeeding circuit. This means the output voltage is unaffected by the impedance of the succeeding circuit, providing isolation.

[0038] The push-pull output circuit includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifth transistor T5, a fifteenth resistor R15, a sixteenth resistor R16, a sixth transistor T6, a twelfth capacitor C12 and a thirteenth capacitor C13, and a first bidirectional diode CR1 composed of a second-end diode and a third-end diode, wherein the first bidirectional diode CR1 is connected to the output end of the second operational amplifier U2, the cathode of the second-end diode is connected to one end of the thirteenth resistor R13, the anode of the third-end diode is connected to the base of the sixth transistor T6, the other end of the thirteenth resistor R13 is connected to one end of the twelfth resistor R12 and the base of the fifth transistor T5, one end of the fourteenth resistor R14 is connected to the base of the sixth transistor T6, and the other end is connected to the collector of the sixth transistor T6, and the floating positive voltage +VCCF is connected to the The collector of the sixth transistor T6 is connected; the thirteenth capacitor C13 serves as a bias voltage filter capacitor, one end of which is connected to the collector of the sixth transistor T6, and the other end is connected to the floating ground F-COM. The emitter of the sixth transistor T6 is connected to one end of the sixteenth resistor R16, the other end of the sixteenth resistor R16 is connected to one end of the fifteenth resistor R15, and serves as the output end to output the power supply VB; the base of the fifth transistor T5 is connected to the thirteenth resistor R13 and the twelfth resistor R12 respectively, the other end of the twelfth resistor R12 is connected to the collector of the fifth transistor T5, the floating negative voltage -VEEF is connected to the collector of the fifth transistor T5, the twelfth capacitor C12 serves as a bias voltage filter capacitor, one end of which is connected to the collector of the fifth transistor T5, and the other end is connected to the floating ground F-COM. The emitter of the fifth transistor T5 is connected to the fifteenth resistor R15.

[0039] The voltage-stabilizing circuit includes a first voltage-stabilizing diode DZ1, a second voltage-stabilizing diode DZ2, a first resistor R1, and a first capacitor C1. The first and second voltage-stabilizing diodes DZ1 and DZ2 are connected in reverse series and in parallel with the first resistor R1. One end of the first resistor R1 is connected to the input power supply VB, and the other end is connected to the first capacitor C1. One end of the first capacitor C1 is connected to the floating ground F-COM, and the other end is connected to the second op amp follower circuit. The first capacitor C1 is connected to the non-inverting input of the first op amp U1.

[0040] The voltage adjustment circuit includes positive voltage adjustment and negative voltage adjustment. The positive voltage adjustment includes a third resistor R3, a third voltage-stabilizing diode DZ3, a sixth capacitor C6, a first transistor T1, a seventh resistor R7 and a ninth resistor R9. The third resistor R3 is connected to the anode of the third voltage-stabilizing diode DZ3, one end of the sixth capacitor C6 is connected to the third resistor R3, and the other end is connected to the cathode of the third voltage-stabilizing diode DZ3. The collector of the first transistor T1 is connected to the cathode of the third voltage-stabilizing diode DZ3 and the other end of the sixth capacitor C6. The emitter of the first transistor T1 is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is connected to the floating positive voltage +VCCF. The base of the first transistor T1 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the floating ground F-COM.

[0041] The negative voltage adjustment includes a fourth resistor R4, a fourth voltage-stabilizing diode DZ4, a seventh capacitor C7, a second transistor T2, an eighth resistor R8 and a tenth resistor R10. The fourth resistor R4 is connected to one end of the cathode of the fourth voltage-stabilizing diode DZ4, one end of the seventh capacitor C7 is connected to the fourth resistor R4, and the other end is connected to one end of the anode of the fourth voltage-stabilizing diode DZ4, the collector of the second transistor T2 is connected to one end of the anode of the fourth voltage-stabilizing diode DZ4, and the other end of the seventh capacitor C7 is connected, the emitter of the second transistor T2 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the floating ground negative voltage -VEEF, the base of the second transistor T2 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the floating ground F-COM.

[0042] The positive and negative power output circuit includes a third transistor T3, a fifth resistor R5, an eighth capacitor C8, a fourth transistor T4, and a sixth resistor R6. The collector of the third transistor T3 is connected to a floating positive voltage +VCCF, the base of the third transistor T3 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the collector of the first transistor T1, the emitter of the third transistor T3 is connected to the other end of the eighth capacitor C8, and the positive power output circuit outputs +VAF. The collector of the fourth transistor T4 is connected to a floating negative voltage -VEEF, the base of the fourth transistor T4 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the collector of the second transistor T2, and the emitter of the fourth transistor T4 is connected to the other end of the eighth capacitor C8, and the negative power output circuit outputs -VAF. The positive and negative power output circuit can float relative to the power input terminal to meet the power supply requirements of the operational amplifier.

[0043] The fifth transistor T5 in the present invention is a PNP transistor, the sixth transistor T6 is an NPN transistor; the first transistor T1 is a PNP transistor, the second transistor T2 is an NPN transistor; the third transistor T3 is an NPN transistor, and the fourth transistor T4 is a PNP transistor. The positive output power supply is +VAF, and the negative output power supply is -VAF.

[0044] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A floating symmetrical power supply circuit for an operational amplifier with a wide voltage range, characterized by: It includes a first operational amplifier follower circuit, a second operational amplifier follower circuit, a push-pull output circuit, a voltage stabilizing circuit, a voltage regulating circuit and a positive and negative power supply output circuit, wherein the first operational amplifier follower circuit is connected to the push-pull output circuit, the push-pull output circuit is connected to the voltage stabilizing circuit, the voltage stabilizing circuit is connected to the second operational amplifier follower circuit, the second operational amplifier follower circuit is connected to the voltage regulating circuit, and the voltage regulating circuit is connected to the positive and negative power supply output circuit; The first op amp follower circuit includes an eleventh resistor R11, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11 and a second op amp U2, one end of the ninth capacitor C9 is connected to the floating ground F-COM, and the other end is connected to one end of the eleventh resistor R11, and then connected to the non-inverting input terminal of the second op amp U2, and the other end of the eleventh resistor R11 is connected to the input power supply VIN; the floating positive voltage +VCCF is connected to the positive power supply of the second op amp U2 and is connected in parallel with one end of the tenth capacitor C10, and the other end of the tenth capacitor C10 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop; the floating negative voltage -VEEF is connected to the negative power supply of the second op amp U2 and is connected in parallel with one end of the eleventh capacitor C11, and the other end of the eleventh capacitor C11 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop; The second op amp follower circuit includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a second resistor R2 and a first op amp U1. The floating positive voltage +VCCF is connected to the positive power supply of the first op amp U1 and is connected in parallel with one end of the second capacitor C2. The other end of the second capacitor C2 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop. The floating negative voltage -VEEF is connected to the negative power supply of the first operational amplifier U1 and is connected in parallel with one end of the third capacitor C3. The other end of the third capacitor C3 is connected to the floating ground F-COM to form a power supply decoupling filter capacitor loop; The inverting input terminal of the first operational amplifier U1 is connected to one end of the fourth capacitor C4, one end of the second resistor R2, and one end of the fifth capacitor C5. The other end of the fourth capacitor C4 is connected in parallel with the second resistor R2. The other end of the fifth capacitor C5 is connected to the floating ground F-COM. The push-pull output circuit includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifth transistor T5, a fifteenth resistor R15, a sixteenth resistor R16, a sixth transistor T6, a twelfth capacitor C12 and a thirteenth capacitor C13, and a first bidirectional diode CR1 consisting of a second-end diode and a third-end diode, wherein the first bidirectional diode CR1 is connected to the output end of the second operational amplifier U2, the cathode of the second-end diode is simultaneously connected to the other end of the thirteenth resistor R13, the anode of the third-end diode is connected to the base of the sixth transistor T6 and one end of the fourteenth resistor R14; One end of the thirteenth resistor R13 is connected to one end of the twelfth resistor R12 and the base of the fifth transistor T5, the other end of the fourteenth resistor R14 is connected to the collector of the sixth transistor T6, and the floating positive voltage +VCCF is connected to the collector of the sixth transistor T6; A thirteenth capacitor C13, serving as a bias voltage filter capacitor, has one end connected to the collector of the sixth transistor T6 and the other end connected to the floating ground F-COM. The emitter of the sixth transistor T6 is connected to one end of a sixteenth resistor R16, and the other end of the sixteenth resistor R16 is connected to one end of a fifteenth resistor R15, serving as an output terminal for outputting the power supply VB. The base of the fifth transistor T5 is connected to one end of the thirteenth resistor R13 and one end of the twelfth resistor R12 respectively, the other end of the twelfth resistor R12 is connected to the collector of the fifth transistor T5, and the floating negative voltage -VEEF is connected to the collector of the fifth transistor T5; The twelfth capacitor C12 is used as a bias voltage filter capacitor, one end of which is connected to the collector of the fifth transistor T5, and the other end is connected to the floating ground F-COM. The emitter of the fifth transistor T5 is connected to the other end of the fifteenth resistor R15; The non-inverting input terminal of the first operational amplifier U1 is connected to the second voltage regulator DZ2, the first capacitor C1 and the first resistor R1; The inverting input terminal of the second operational amplifier U2 is simultaneously connected to the fifteenth resistor R15, the sixteenth resistor R16, the first resistor R1, and the cathode of the first voltage-stabilizing diode DZ1, and outputs a voltage VB; The voltage stabilizing circuit includes a first voltage stabilizing tube DZ1, a second voltage stabilizing tube DZ2, a first resistor R1, and a first capacitor C1. One end of the anode of the first voltage stabilizing tube DZ1 and one end of the anode of the second voltage stabilizing tube DZ2 are connected in series and then connected in parallel with the first resistor R1. One end of the first resistor R1 is connected to the input power supply VB, and the other end is connected to the first capacitor C1. One end of the first capacitor C1 is connected to the floating ground F-COM, and the other end is connected to the second operational amplifier follower circuit. The voltage adjustment circuit includes positive voltage adjustment and negative voltage adjustment; The positive voltage adjustment includes a third resistor R3, a third voltage-stabilizing tube DZ3, a sixth capacitor C6, a first transistor T1, a seventh resistor R7 and a ninth resistor R9, one end of the third resistor R3 is connected to an anode end of the third voltage-stabilizing tube DZ3, one end of the sixth capacitor C6 is connected to the other end of the third resistor R3, the other end of the sixth capacitor C6 is connected to a cathode end of the third voltage-stabilizing tube DZ3, the collector of the first transistor T1 is connected to a cathode end of the third voltage-stabilizing tube DZ3 and the other end of the sixth capacitor C6, the emitter of the first transistor T1 is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to a floating positive voltage +VCCF, the base of the first transistor T1 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to a floating ground F-COM; The negative voltage adjustment includes a fourth resistor R4, a fourth voltage-stabilizing tube DZ4, a seventh capacitor C7, a second transistor T2, an eighth resistor R8 and a tenth resistor R10, one end of the fourth resistor R4 is simultaneously connected to the cathode end of the fourth voltage-stabilizing tube DZ4 and one end of the seventh capacitor C7, the other end of the seventh capacitor C7 is connected to the anode end of the fourth voltage-stabilizing tube DZ4, the collector of the second transistor T2 is connected to the anode end of the fourth voltage-stabilizing tube DZ4, and the other end of the seventh capacitor C7, the collector of the second transistor T2 is simultaneously connected to one end of the sixth resistor R6, one end of the anode end of the fourth voltage-stabilizing tube DZ4, and the other end of the seventh capacitor C7, the emitter of the second transistor T2 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the floating ground negative voltage -VEEF, the base of the second transistor T2 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the floating ground F-COM; The positive and negative power supply output circuit includes a third transistor T3, a fifth resistor R5, an eighth capacitor C8, a fourth transistor T4 and a sixth resistor R6. The collector of the third transistor T3 is connected to the floating positive voltage +VCCF, the base of the third transistor T3 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the collector of the first transistor T1, the emitter of the third transistor T3 is connected to one end of the eighth capacitor C8, and the positive power supply +VAF is output at the same time. The collector of the fourth transistor T4 is connected to the floating negative voltage -VEEF, the base of the fourth transistor T4 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the collector of the second transistor T2, and the emitter of the fourth transistor T4 is connected to the other end of the eighth capacitor C8, and the negative power supply -VAF is output at the same time.

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