A power supply circuit and electronic device with adjustable output voltage

Abstract

This invention provides a power supply circuit and electronic device with adjustable output voltage, specifically including: a reference source module, a zero-position correction module, and a gain adjustment module. The output terminal of the reference source module is connected to the first input terminal of the zero-position correction module, the second input terminal of the zero-position correction module is connected to the voltage output terminal of an external control chip, the output terminal of the zero-position correction module is connected to the input terminal of the gain adjustment module, and the output terminal of the gain adjustment module supplies power to an external load. This application provides a reference voltage through the reference source module, connects the reference source module and the zero-position correction module for zero-position correction, and then amplifies the zero-position corrected signal through the gain adjustment module to achieve rapid and precise voltage adjustment. The power supply circuit with adjustable output voltage provided in this application achieves rapid and high-precision voltage regulation through the cascaded design of the reference source module, the zero-position correction module, and the gain adjustment module.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, specifically to a power supply circuit and electronic device with adjustable output voltage. Background Technology

[0002] In the field of optical scanning equipment control, especially in galvanometer system applications, the performance of the power supply circuit has a decisive impact on the accuracy and response speed of the motor drive.

[0003] In existing technologies, power supply solutions relying on ordinary digital-to-analog converters generally suffer from slow response speeds, causing the system to be unable to adjust the output voltage in a timely manner when dynamic loads change, thus leading to timing delays during the scanning process. Simultaneously, insufficient output accuracy results in poor voltage stability, making it difficult to meet high-precision control requirements. In galvanometer scanning scenarios, the power supply control of the X-axis and Y-axis motors directly affects the image geometry, including the accuracy of the center position and border dimensions. Existing technologies fail to provide a simple and effective mechanism to simultaneously address rapid voltage regulation, zero-drift correction, and gain control issues, resulting in degraded scanned image quality and reduced system reliability.

[0004] In other words, how to provide a power supply circuit with adjustable output voltage to achieve fast and high-precision voltage regulation is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] In view of the above-mentioned problems, the present invention aims to provide a power supply circuit and electronic device with adjustable output voltage, thereby solving at least one of the above-mentioned technical problems.

[0006] To at least solve the above-mentioned technical problems, in a first aspect, this utility model provides a power supply circuit with adjustable output voltage, the circuit comprising: The system includes a reference source module, a zero-point correction module, and a gain adjustment module. The output of the reference source module is connected to the first input of the zero-point correction module. The second input of the zero-point correction module is connected to the voltage output of an external control chip. The output of the zero-point correction module is connected to the input of the gain adjustment module. The output of the gain adjustment module supplies power to an external load.

[0007] Preferably, the reference source module includes: The first resistor R1, one end of which is connected to the main power supply; A first potentiometer W1 has its first fixed terminal connected to the other end of the first resistor R1, and its second fixed terminal connected to its sliding terminal. The second resistor R2, one end of which is connected to the second fixed terminal of the first potentiometer W1; The third resistor R3 has one end connected to the other end of the second resistor R2, and the other end of the third resistor R3 is grounded. The first voltage regulator TL1 has its anode grounded, its cathode connected to the first fixed terminal of the first potentiometer W1 and the other end of the first resistor R1, and its reference terminal connected to the other end of the second resistor R2 and one end of the third resistor R3.

[0008] Preferably, the reference source module further includes: The first magnetic bead BR1 has one end connected to one end of the first resistor R1 and the other end connected to the main power supply. The first capacitor C1 has one end connected to one end of the first magnetic bead BR1 and one end of the first resistor R1.

[0009] Preferably, the zero-position correction module includes: The fourth resistor R4, one end of which is the first input terminal of the zero-position correction module; The first operational amplifier U1 has its inverting input terminal connected to the other end of the fourth resistor R4, its positive power supply terminal connected to an external positive power supply, and its negative power supply terminal connected to an external negative power supply. The fifth resistor R5 is connected between the inverting input terminal and the output terminal of the first operational amplifier U1; The sixth resistor R6 has one end as the second input terminal of the zero-position correction module and the other end as connected to the non-inverting input terminal of the first operational amplifier U1. The second capacitor C2 has one end connected to the non-inverting input terminal of the first operational amplifier U1, and the other end grounded. The seventh resistor R7, one end of which is connected to the positive power supply terminal of the first operational amplifier U1; The eighth resistor R8, one end of which is connected to the negative power supply terminal of the first operational amplifier U1; The second magnetic bead BR2 has one end connected to the other end of the seventh resistor R7, and the other end connected to an external positive power supply. The third magnetic bead BR3 has one end connected to the other end of the eighth resistor R8, and the other end of the third magnetic bead BR3 is connected to an external positive power supply.

[0010] Preferably, the gain adjustment module includes: The ninth resistor R9, one end of which is the input terminal of the gain adjustment module; The second operational amplifier U2 has its non-inverting input connected to the other end of the ninth resistor R9, its positive power supply connected to the positive power supply of the first operational amplifier U1, and its negative power supply connected to the negative power supply of the first operational amplifier U1. The tenth resistor R10 is connected between the inverting input terminal and the output terminal of the second operational amplifier U2; The second potentiometer TL2 has its first fixed terminal connected to the inverting input terminal of the second operational amplifier U2, and its second fixed terminal connected to the sliding terminal. The eleventh resistor R11 has one end grounded and the other end connected to the second fixed terminal of the second potentiometer TL2. The twelfth resistor R12 has one end connected to the output terminal of the second operational amplifier U2, and the other end is the output terminal of the gain adjustment module.

[0011] Preferably, the gain adjustment module further includes: The third capacitor C3 has one end connected to the other end of the twelfth resistor R12, and the other end of the third capacitor C3 is grounded. An electrostatic diode D1 is connected in parallel across the two ends of the third capacitor C3.

[0012] Preferably, the zero-position correction module further includes: The fourth capacitor C4 has one end connected to one end of the seventh resistor R7, and the other end of the fourth capacitor C4 is grounded. The fifth capacitor C5 is connected in parallel across the two ends of the fourth capacitor C4; The sixth capacitor C6 has one end connected to one end of the eighth resistor R8, and the other end of the sixth capacitor C6 is grounded. The seventh capacitor C7 is connected in parallel across the two ends of the sixth capacitor C6.

[0013] Preferably, the supply voltage of both the positive power supply and the negative power supply is 15V, and the supply voltage of the main power supply is 5V.

[0014] Preferably, the output voltage range of the voltage output terminal of the control chip is 0V-2.5V.

[0015] In a second aspect, this application provides an electronic device including a power supply circuit with an adjustable output voltage as described in any one of the first aspects.

[0016] Beneficial effects: This invention provides a power supply circuit with adjustable output voltage, specifically including: a reference source module, a zero-point correction module, and a gain adjustment module. The output terminal of the reference source module is connected to the first input terminal of the zero-point correction module, the second input terminal of the zero-point correction module is connected to the voltage output terminal of an external control chip, and the output terminal of the zero-point correction module is connected to the input terminal of the gain adjustment module. The output terminal of the gain adjustment module supplies power to an external load. The reference source module provides a stable reference voltage, and its output terminal is connected to the first input terminal of the zero-point correction module, thereby establishing a precise reference point for the entire circuit and effectively reducing the impact of temperature drift and noise interference on the output voltage. Furthermore, the zero-point correction module receives the reference voltage provided by the reference source module and connects to the voltage output terminal of the external control chip through its second input terminal, thereby enabling zero-point adjustment in the circuit. The output terminal of the zero-point correction module is connected to the input terminal of the gain adjustment module, transmitting the zero-point correction signal to the gain adjustment module. Based on the received signal, the gain adjustment module achieves flexible adjustment of the output amplitude through precise control of the voltage scaling ratio to adapt to the needs of different loads. Therefore, this application achieves fast and high-precision voltage regulation through the cascaded design of the reference source module, the zero-point correction module, and the gain adjustment module.

[0017] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the power supply circuit with adjustable output voltage provided in Embodiment 1; Figure 2 A schematic diagram of the circuit structure of the zero-position correction module and the gain adjustment module provided in Embodiment 1; Figure 3 This is a schematic diagram of the circuit structure of the reference source module provided in Example 1. Detailed Implementation

[0020] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art are within the scope of protection of this utility model; wherein the keyword "and / or" involved in this embodiment indicates two situations, and or. In other words, A and / or B mentioned in the embodiments of this specification indicates two situations, A and B, and A or B, describing three states of A and B. For example, A and / or B means: only A is included but not B; only B is included but not A; and A and B are included.

[0021] Furthermore, in the embodiments of this specification, when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component present. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component present.

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0023] Example 1 Please see Figure 1-3 This embodiment provides a power supply circuit with adjustable output voltage. The power supply circuit provided in this embodiment includes: a reference source module, a zero-position correction module, and a gain adjustment module. The output terminal of the reference source module is connected to the first input terminal of the zero-position correction module, the second input terminal of the zero-position correction module is connected to the voltage output terminal of an external control chip, the output terminal of the zero-position correction module is connected to the input terminal of the gain adjustment module, and the output terminal of the gain adjustment module supplies power to an external load.

[0024] Specifically, this application provides a power supply circuit with adjustable output voltage, comprising: a reference source module, a zero-point correction module, and a gain adjustment module. The output terminal of the reference source module is connected to the first input terminal of the zero-point correction module, the second input terminal of the zero-point correction module is connected to the voltage output terminal of an external control chip, and the output terminal of the zero-point correction module is connected to the input terminal of the gain adjustment module. The output terminal of the gain adjustment module supplies power to an external load. The reference source module provides a stable reference voltage, and its output terminal is connected to the first input terminal of the zero-point correction module, thereby establishing a precise reference point for the entire circuit and effectively reducing the impact of temperature drift and noise interference on the output voltage. Further, the zero-point correction module receives the reference voltage provided by the reference source module and connects to the voltage output terminal of the external control chip through its second input terminal, thereby enabling zero-point adjustment in the circuit. The output terminal of the zero-point correction module is connected to the input terminal of the gain adjustment module, transmitting the zero-point correction signal to the gain adjustment module. Based on the received signal, the gain adjustment module flexibly adjusts the output amplitude by precisely controlling the voltage scaling ratio to adapt to the needs of different loads. Therefore, this application achieves fast and high-precision voltage regulation through the cascaded design of the reference source module, the zero-point correction module, and the gain adjustment module.

[0025] In one possible implementation, the reference source module includes: a first resistor R1, a first potentiometer W1, a second resistor R2, a third resistor R3, and a first voltage regulator TL1; one end of the first resistor R1 is connected to the main power supply; the first fixed end of the first potentiometer W1 is connected to the other end of the first resistor R1, and the second fixed end of the first potentiometer W1 is connected to the sliding end; one end of the second resistor R2 is connected to the second fixed end of the first potentiometer W1; one end of the third resistor R3 is connected to the other end of the second resistor R2, and the other end of the third resistor R3 is grounded; the anode of the first voltage regulator TL1 is grounded, the cathode is connected to the first fixed end of the first potentiometer W1 and the other end of the first resistor R1, respectively, and the reference end is connected to the other end of the second resistor R2 and one end of the third resistor R3, respectively.

[0026] The main power supply operates at a voltage of 5V. This main power supply provides the input reference for the reference module and can be implemented using a low-noise 5V regulated power supply. The purpose is to provide a precise and stable input to the reference regulator, thereby ensuring the high-precision output of the entire circuit.

[0027] Specifically, the first resistor R1 acts as a current-limiting element in the input path, aiming to ensure the initial stability of the input voltage and prevent direct impact of power supply fluctuations on the reference source. The first potentiometer W1 is a variable resistor device, designed to dynamically change the voltage division ratio to compensate for zero-point drift. The second resistor R2 and the third resistor R3 together form a resistor divider network to provide a controllable voltage division ratio, thereby ensuring the stability of the reference potential. The first voltage regulator TL1 is a high-precision adjustable parallel voltage regulator that achieves flexible adjustment of the output voltage through the resistor divider network, ultimately providing a 2.5V reference voltage. The first voltage regulator TL1 can be implemented using a TL431.

[0028] This application effectively solves the zero-point drift problem by fine-tuning the first potentiometer W1. Furthermore, this reference source module, in conjunction with other parts of the aforementioned power supply circuit, provides a high-precision reference voltage for subsequent circuits, significantly improving the overall circuit's response speed and control accuracy.

[0029] In one possible implementation, the reference source module further includes: a first ferrite bead BR1 and a first capacitor C1; one end of the first ferrite bead BR1 is connected to one end of the first resistor R1, and the other end of the first ferrite bead BR1 is connected to the main power supply; one end of the first capacitor C1 is connected to one end of the first ferrite bead BR1 and one end of the first resistor R1.

[0030] Specifically, this application effectively suppresses the interference of main power supply noise on the reference voltage by introducing a collaborative filtering mechanism of ferrite beads and capacitors, thus ensuring the purity of the reference source.

[0031] In one possible implementation, the zero-position correction module includes: a fourth resistor R4, a first operational amplifier U1, a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a seventh resistor R7, an eighth resistor R8, a second ferrite bead BR2, and a third ferrite bead BR3; one end of the fourth resistor R4 is the first input terminal of the zero-position correction module; the inverting input terminal of the first operational amplifier U1 is connected to the other end of the fourth resistor R4, the positive power supply terminal of the first operational amplifier U1 is connected to an external positive power supply, and the negative power supply terminal of the first operational amplifier U1 is connected to an external negative power supply; the fifth resistor R5 is connected between the inverting input terminal and the output terminal of the first operational amplifier U1; the sixth resistor R6... One end is the second input terminal of the zero-position correction module; the other end of the sixth resistor R6 is connected to the non-inverting input terminal of the first operational amplifier U1; one end of the second capacitor C2 is connected to the non-inverting input terminal of the first operational amplifier U1, and the other end of the second capacitor C2 is grounded; one end of the seventh resistor R7 is connected to the positive power supply terminal of the first operational amplifier U1; one end of the eighth resistor R8 is connected to the negative power supply terminal of the first operational amplifier U1; one end of the second ferrite bead BR2 is connected to the other end of the seventh resistor R7, and the other end of the second ferrite bead BR2 is connected to the external positive power supply; one end of the third ferrite bead BR3 is connected to the other end of the eighth resistor R8, and the other end of the third ferrite bead BR3 is connected to the external positive power supply.

[0032] Both the positive and negative power supplies are supplied with a voltage of 15V. These power supplies provide symmetrical dual-power DC power to the operational amplifier, and can be implemented using ±15V regulated power supply modules. The purpose is to ensure the operational amplifier operates under optimal conditions and avoid signal bias issues.

[0033] Furthermore, the output voltage range of the voltage output terminal of the control chip is 0V-2.5V.

[0034] Specifically, by setting up the zero-point correction module and configuring the operational amplifier U1 therein to unity gain mode, the zero-point voltage point of the overall circuit's output voltage can be precisely adjusted.

[0035] In actual operation, the 1.25V output from the control chip is used as the intermediate zero point, so that when the control chip outputs 1.25V, the output voltage from the gain adjustment module to the load is 0V. However, due to a slight mV-level voltage error in the circuit, the output voltage is not zero when the control chip outputs 1.25V. In this case, the output voltage can be adjusted slightly by adjusting the first potentiometer W1 to make the output voltage 0V, thereby achieving precise adjustment of the circuit's output zero point.

[0036] Meanwhile, the 0V output of the control chip is used as the lower limit reference point, so that when the voltage output terminal of the control chip is 0V, the output voltage of the gain adjustment module to the load is the minimum value; the 2.5V output of the control chip is used as the upper limit reference point, so that when the voltage output terminal of the control chip is 2.5V, the output voltage of the gain adjustment module to the load is the maximum value.

[0037] In one possible implementation, the gain adjustment module includes: a ninth resistor R9, a second operational amplifier U2, a tenth resistor R10, a second potentiometer TL2, an eleventh resistor R11, and a twelfth resistor R12; one end of the ninth resistor R9 is the input terminal of the gain adjustment module; the non-inverting input terminal of the second operational amplifier U2 is connected to the other end of the ninth resistor R9, the positive power supply terminal of the second operational amplifier U2 is connected to the positive power supply terminal of the first operational amplifier U1, and the negative power supply terminal of the second operational amplifier U2 is connected to the negative power supply terminal of the first operational amplifier U1; the tenth resistor R10 is connected between the inverting input terminal and the output terminal of the second operational amplifier U2; the first fixed terminal of the second potentiometer TL2 is connected to the inverting input terminal of the second operational amplifier U2, and the second fixed terminal of the second potentiometer TL2 is connected to the sliding terminal; one end of the eleventh resistor R11 is grounded, and the other end of the eleventh resistor R11 is connected to the second fixed terminal of the second potentiometer TL2; one end of the twelfth resistor R12 is connected to the output terminal of the second operational amplifier U2, and the other end of the twelfth resistor R12 is the output terminal of the gain adjustment module.

[0038] Specifically, the second operational amplifier U2 is a high-speed operational amplifier used to achieve phase-distortion-free signal gain processing and respond instantly to input changes. The tenth resistor R10 is used to set the base gain coefficient and provide a stable dynamic adjustment reference. The second potentiometer TL2 is used for manual gain adjustment. The eleventh resistor R11 can be understood as a reference potential forming element, used to provide a fixed reference potential point for the potentiometer, ensuring linearity and repeatability during adjustment. The twelfth resistor R12 is used to limit instantaneous inrush current, protecting the load circuit from surge effects. The above gain adjustment module achieves precise dynamic calibration of the output voltage gain through the cooperation of these key components.

[0039] Through the above technical solution, the gain adjustment module is freed from dependence on software adjustment, achieving fast and precise hardware-level control, thus meeting the high dynamic performance requirements of the galvanometer scanning system for voltage output. This solution, through the collaborative design of a high-speed operational amplifier and an adjustable potentiometer, solves the problems of dynamic response and accuracy stability in gain control, providing reliable technical support for the precise control of high-speed galvanometer scanning systems.

[0040] In one possible implementation, the gain adjustment module further includes: a third capacitor C3 and an electrostatic diode D1; one end of the third capacitor C3 is connected to the other end of the twelfth resistor R12, and the other end of the third capacitor C3 is grounded; the electrostatic diode D1 is connected in parallel across the two ends of the third capacitor C3, which can protect the circuit from electrostatic damage while filtering, and further optimize the output performance.

[0041] In one possible implementation, the zero-position correction module further includes: a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7; one end of the fourth capacitor C4 is connected to one end of the seventh resistor R7, and the other end of the fourth capacitor C4 is grounded; the fifth capacitor C5 is connected in parallel across the two ends of the fourth capacitor C4; one end of the sixth capacitor C6 is connected to one end of the eighth resistor R8, and the other end of the sixth capacitor C6 is grounded; the seventh capacitor C7 is connected in parallel across the two ends of the sixth capacitor C6.

[0042] Specifically, by introducing a multi-stage capacitor filter network on both the positive and negative power supply sides, the interference of power supply noise on the zero-position correction module can be effectively suppressed, thereby improving the long-term stability of the output voltage.

[0043] The circuit implementation and adjustment method of this application can be understood through the following formula: Where x represents the output voltage of the control chip's voltage output terminal; Y represents the output voltage amplified by the operational amplifier U2 of the gain adjustment module; Woffset represents the slight adjustment voltage of the first potentiometer W1; Wsacle represents the amplification factor of the second potentiometer W2, which can be used to adjust the output voltage by 1-10 times; 1.25V represents the center voltage of the circuit, corresponding to the middle zero point of the control chip's voltage output terminal.

[0044] In other words, when the voltage output terminal of the control chip outputs 1.25V, the Woffset of the first potentiometer W1 can be adjusted to adjust the final output voltage for powering the load to 0V.

[0045] The final output voltage adjustment range of this application can reach -12V to +12V. Under certain conditions, it can even reach an output voltage adjustment range of -14V to +14V.

[0046] Secondly, this application provides an electronic device including a power supply circuit with an adjustable output voltage as described in any one of the embodiments.

[0047] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the present utility model's technical solution shall still fall within the scope of the present utility model's technical solution.

Claims

1. A power supply circuit with adjustable output voltage, characterized in that, The circuit includes: The system includes a reference source module, a zero-point correction module, and a gain adjustment module. The output of the reference source module is connected to the first input of the zero-point correction module. The second input of the zero-point correction module is connected to the voltage output of an external control chip. The output of the zero-point correction module is connected to the input of the gain adjustment module. The output of the gain adjustment module supplies power to an external load.

2. The power supply circuit with adjustable output voltage as described in claim 1, characterized in that, The reference source module includes: The first resistor R1, one end of which is connected to the main power supply; A first potentiometer W1 has its first fixed terminal connected to the other end of the first resistor R1, and its second fixed terminal connected to its sliding terminal. The second resistor R2, one end of which is connected to the second fixed terminal of the first potentiometer W1; The third resistor R3 has one end connected to the other end of the second resistor R2, and the other end of the third resistor R3 is grounded. The first voltage regulator TL1 has its anode grounded, its cathode connected to the first fixed terminal of the first potentiometer W1 and the other end of the first resistor R1, and its reference terminal connected to the other end of the second resistor R2 and one end of the third resistor R3.

3. The power supply circuit with adjustable output voltage as described in claim 2, characterized in that, The reference source module also includes: The first magnetic bead BR1 has one end connected to one end of the first resistor R1 and the other end connected to the main power supply. The first capacitor C1 has one end connected to one end of the first magnetic bead BR1 and one end of the first resistor R1.

4. The power supply circuit with adjustable output voltage as described in claim 3, characterized in that, The zero-position correction module includes: The fourth resistor R4, one end of which is the first input terminal of the zero-position correction module; The first operational amplifier U1 has its inverting input terminal connected to the other end of the fourth resistor R4, its positive power supply terminal connected to an external positive power supply, and its negative power supply terminal connected to an external negative power supply. The fifth resistor R5 is connected between the inverting input terminal and the output terminal of the first operational amplifier U1; The sixth resistor R6 has one end as the second input terminal of the zero-position correction module and the other end as connected to the non-inverting input terminal of the first operational amplifier U1. The second capacitor C2 has one end connected to the non-inverting input terminal of the first operational amplifier U1, and the other end grounded. The seventh resistor R7, one end of which is connected to the positive power supply terminal of the first operational amplifier U1; The eighth resistor R8, one end of which is connected to the negative power supply terminal of the first operational amplifier U1; The second magnetic bead BR2 has one end connected to the other end of the seventh resistor R7, and the other end connected to an external positive power supply. The third magnetic bead BR3 has one end connected to the other end of the eighth resistor R8, and the other end of the third magnetic bead BR3 is connected to an external positive power supply.

5. The power supply circuit with adjustable output voltage as described in claim 4, characterized in that, The gain adjustment module includes: The ninth resistor R9, one end of which is the input terminal of the gain adjustment module; The second operational amplifier U2 has its non-inverting input connected to the other end of the ninth resistor R9, its positive power supply connected to the positive power supply of the first operational amplifier U1, and its negative power supply connected to the negative power supply of the first operational amplifier U1. The tenth resistor R10 is connected between the inverting input terminal and the output terminal of the second operational amplifier U2; The second potentiometer TL2 has its first fixed terminal connected to the inverting input terminal of the second operational amplifier U2, and its second fixed terminal connected to the sliding terminal. The eleventh resistor R11 has one end grounded and the other end connected to the second fixed terminal of the second potentiometer TL2. The twelfth resistor R12 has one end connected to the output terminal of the second operational amplifier U2, and the other end is the output terminal of the gain adjustment module.

6. The power supply circuit with adjustable output voltage as described in claim 5, characterized in that, The gain adjustment module further includes: The third capacitor C3 has one end connected to the other end of the twelfth resistor R12, and the other end of the third capacitor C3 is grounded. An electrostatic diode D1 is connected in parallel across the two ends of the third capacitor C3.

7. The power supply circuit with adjustable output voltage as described in claim 4, characterized in that, The zero-position correction module also includes: The fourth capacitor C4 has one end connected to one end of the seventh resistor R7, and the other end of the fourth capacitor C4 is grounded. The fifth capacitor C5 is connected in parallel across the two ends of the fourth capacitor C4; The sixth capacitor C6 has one end connected to one end of the eighth resistor R8, and the other end of the sixth capacitor C6 is grounded. The seventh capacitor C7 is connected in parallel across the two ends of the sixth capacitor C6.

8. The power supply circuit with adjustable output voltage as described in claim 4, characterized in that, The supply voltage of both the positive and negative power supplies is 15V, and the supply voltage of the main power supply is 5V.

9. The power supply circuit with adjustable output voltage as described in claim 1, characterized in that, The output voltage range of the voltage output terminal of the control chip is 0V-2.5V.

10. An electronic device, characterized in that, Includes a power supply circuit with adjustable output voltage as described in any one of claims 1-9.

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