Operational amplifier floating symmetrical power supply circuit with wide voltage range

Abstract

The invention discloses an operational amplifier floating symmetrical power supply circuit with a wide voltage range, which comprises 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, and is characterized in that the first operational amplifier follower circuit is connected with the push-pull output circuit, the push-pull output circuit is connected with the voltage stabilizing circuit, and the voltage regulating circuit is connected with the positive and negative power supply output circuit; the voltage stabilizing circuit is connected with the second operational amplifier follower circuit, the second operational amplifier follower circuit is connected with the voltage adjusting circuit, and the voltage adjusting circuit is connected with the positive and negative power supply output circuit. According to the invention, the floating voltage relative to the input power supply VB can be realized, the output power supply can be formulated and optimized according to the specific requirements of the operational amplifier circuit, and the safety and reliability of the operational amplifier power supply are improved by combining with a protection circuit.

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 development of electronic technology, operational amplifiers (op amps) are increasingly used in signal processing, measurement and control. However, traditional op amp power supply circuits often have problems such as poor stability, high noise, and high power consumption, especially when processing complex signals and high-speed signals. Therefore, the present invention proposes a novel wide voltage range op amp floating symmetrical power supply circuit, which aims to solve the above problems, improve the performance and stability of the op amp, and meet the needs of the op amp circuit system. Summary of the invention

[0003] The present invention aims to solve the problems existing 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: An operational amplifier floating symmetrical power supply circuit with a wide voltage range comprises 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.

[0005] 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. 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. 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; 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.

[0006] 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. 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. 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 reverse 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.

[0007] Furthermore, 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, The first bidirectional diode CR1 is connected to the output terminal of the second operational amplifier U2. 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. 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. The floating positive voltage +VCCF is connected to the collector of the sixth transistor T6 as the bias voltage of the sixth transistor T6. The thirteenth capacitor C13 is used as a filter capacitor of the bias voltage, one end of which is connected to the collector of the sixth transistor T6, and the other end of which 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, and the other end of the sixteenth resistor R16 is connected to one end of the fifteenth resistor R15, and serves as an 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, and 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 as the bias voltage of the fifth transistor T5. One end of the twelfth capacitor C12 serving as a filter capacitor of the bias voltage 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 .

[0008] 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.

[0009] Furthermore, the voltage adjustment circuit includes positive voltage adjustment and negative voltage adjustment.

[0010] 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. 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 triode 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 triode 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 triode 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.

[0011] Further, the negative voltage adjustment includes a fourth resistor R4, a fourth voltage regulator DZ4, a seventh capacitor C7, a second triode 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 regulator 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 regulator DZ4, the collector of the second triode T2 is connected to one end of the anode of the fourth voltage regulator DZ4, and the other end of the seventh capacitor C7 is connected, the emitter of the second triode 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 triode 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.

[0012] Further, 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 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 supply +VAF is output at the same time, 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, 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.

[0013] The two operational amplifier follower circuits are used to open the circuit of the front stage when the input impedance is very high, and to be a constant voltage source for the rear stage circuit when the output impedance is very low, that is, the output voltage is not affected by the impedance of the rear stage circuit, and has an isolation effect; the voltage stabilizing circuit is used to provide a stable input voltage by accurately controlling the current and voltage when the power supply is preset; the push-pull output circuit is used to realize the state of the output end of the load by bidirectionally pushing the control output end through the conduction and cutoff of the triode; the voltage adjustment circuit includes two symmetrical voltage adjustment units, which are respectively connected to the output end of the operational amplifier and the positive and negative power supply output ends, and the beneficial effects produced thereby are: the power supply circuit has a floating design, and the floating symmetrical power supply can reduce the influence of the power supply noise on the signal, thereby improving the signal quality, and can adapt to the needs of the operational amplifier circuit system, especially the needs in the high-voltage circuit environment, and has strong versatility and flexibility. Compared with the prior art, the present invention can realize the 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 is combined with the protection circuit to improve 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 operational amplifier power supply design of electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] like Figure 1The present invention discloses 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 circuit.

[0017] 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, an input voltage VIN is connected to the in-phase input terminal of the second operational amplifier 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 and then connected to the in-phase input terminal of the second operational amplifier U2, the floating ground 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, 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 ground 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, 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 reverse input terminal of the second operational amplifier U2 is connected to the fifteenth resistor R15 and the sixteenth resistor R16.

[0018] 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. 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; 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 reverse 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.

[0019] The output terminals of the first operational amplifier U1 and the second operational amplifier U2 are equal to the reverse input terminals in voltage magnitude and phase. This circuit has the characteristics of high input impedance and low output impedance. When the input impedance is very high, it is equivalent to an open circuit for the previous stage circuit. When the output impedance is very low, it is equivalent to a constant voltage source for the subsequent stage circuit, that is, the output voltage is not affected by the impedance of the subsequent stage circuit and has an isolation effect.

[0020] 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 is connected to the collector of the sixth transistor T6 as a filter capacitor of the bias voltage, 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 respectively connected to the thirteenth resistor R13 and the twelfth resistor R12, 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 is connected to the collector of the fifth transistor T5 as a filter capacitor of the bias voltage, and the other end is connected to the floating ground F-COM, and the emitter of the fifth transistor T5 is connected to the fifteenth resistor R15.

[0021] 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. The first voltage stabilizing tube DZ1 and the second voltage stabilizing tube 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 operational amplifier follower circuit. The first capacitor C1 is connected to the in-phase input end of the first operational amplifier U1.

[0022] The voltage adjustment circuit includes positive voltage adjustment and negative voltage adjustment. 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. The third resistor R3 is connected to the anode of the third voltage regulator 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 regulator DZ3. The collector of the first transistor T1 is connected to the cathode of the third voltage regulator 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.

[0023] The negative voltage adjustment includes a fourth resistor R4, a fourth voltage regulator DZ4, a seventh capacitor C7, a second triode 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 regulator 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 regulator DZ4, the collector of the second triode T2 is connected to one end of the anode of the fourth voltage regulator DZ4, and the other end of the seventh capacitor C7 is connected, the emitter of the second triode 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 triode 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.

[0024] 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, wherein 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 supply +VAF is outputted at the same time, 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, 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 outputted at the same time. The positive and negative power supply output circuit can float relative to the power supply input terminal to meet the power supply requirements of the operational amplifier.

[0025] 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, the fourth transistor T4 is a PNP transistor, the positive output power supply is +VAF, and the negative output power supply is -VAF.

[0026] 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 operational amplifier floating symmetrical power supply circuit with a wide voltage range, characterized in that: 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. 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.

2. The operational amplifier floating symmetrical power supply circuit with a wide voltage range as claimed in claim 1, characterized in that: 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. 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. 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; 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.

3. The operational amplifier floating symmetrical power supply circuit with a wide voltage range as claimed in claim 1, characterized in that: 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. 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. 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 reverse 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.

4. The operational amplifier floating symmetrical power supply circuit with a wide voltage range as claimed in claim 1, characterized in that: The push-pull output circuit comprises 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, The first bidirectional diode CR1 is connected to the output terminal of the second operational amplifier U2. 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. 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 collector of the sixth transistor T6; The thirteenth capacitor C13 is used as a filter capacitor of the bias voltage, one end of which is connected to the collector of the sixth transistor T6, and the other end of which 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, and the other end of the sixteenth resistor R16 is connected to one end of the fifteenth resistor R15, and serves as an 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, and 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. One end of the twelfth capacitor C12 serving as a filter capacitor of the bias voltage 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 .

5. The operational amplifier floating symmetrical power supply circuit with a wide voltage range as claimed in claim 4, characterized in that: 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 operational amplifier follower circuit.

6. The operational amplifier floating symmetrical power supply circuit with a wide voltage range as claimed in claim 1, characterized in that: The voltage regulation circuit includes positive voltage regulation and negative voltage regulation.

7. The operational amplifier floating symmetrical power supply circuit with a wide voltage range as claimed in claim 6, characterized in that: 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. 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 triode 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 triode 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 triode 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.

8. The operational amplifier floating symmetrical power supply circuit with a wide voltage range as claimed in claim 6, characterized in that: The negative voltage adjustment includes a fourth resistor R4, a fourth voltage regulator DZ4, a seventh capacitor C7, a second triode 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 regulator 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 regulator DZ4, the collector of the second triode T2 is connected to one end of the anode of the fourth voltage regulator DZ4, and the other end of the seventh capacitor C7 is connected, the emitter of the second triode 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 triode 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.

9. The operational amplifier floating symmetrical power supply circuit with a wide voltage range as claimed in claim 8, characterized in that: 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 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 supply +VAF is output at the same time. 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, 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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