A voltage regulator circuit and method

Abstract

This invention discloses a voltage regulator circuit and method, relating to the field of power supply technology. It includes a signal processing circuit and a voltage output circuit. The first and second input terminals of the signal processing circuit are connected to a control signal output terminal, and the output terminal of the signal processing circuit is connected to the input terminal of the voltage output circuit. The third input terminal of the signal processing circuit and the output terminal of the voltage output circuit are connected to a load input terminal. The signal processing circuit generates a differential signal based on the control signal from the first input terminal and the load input voltage from the third input terminal, and then generates a compensation adjustment signal based on the control signal from the second input terminal and the differential signal. The voltage output circuit outputs a voltage based on the compensation adjustment signal to compensate and adjust the load input voltage. This invention features voltage compensation functionality, enabling compensation and adjustment of the power supply voltage at the load input terminal, and is suitable for applications with variable load power supply voltages and requiring high precision.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and in particular to a voltage regulator circuit and method. Background Technology

[0002] Currently, the chip integration of electrical equipment is becoming increasingly high, and the types of chips used in electrical equipment are also increasing, requiring stable power supply solutions.

[0003] In practical applications, as the current of the electrical equipment increases, the voltage drop between the power supply output and the equipment's input will increase significantly, especially when the power supply line is long. When the equipment's chip is sensitive to the input voltage, this voltage drop can cause the chip to fail to meet operational requirements, leading to adverse consequences. Therefore, a voltage regulator circuit is needed to ensure voltage stability at the load input. Summary of the Invention

[0004] This invention provides a voltage regulator circuit and method to solve the technical problem in existing power supply circuits where the voltage drop at the load input terminal is large when the downstream load is too large or the power supply trace is too long, resulting in insufficient power supply to the chip.

[0005] In one aspect, a voltage regulator circuit is provided, including: a signal processing circuit and a voltage output circuit;

[0006] The first and second input terminals of the signal processing circuit are connected to the control signal output terminal, the output terminal of the signal processing circuit is connected to the input terminal of the voltage output circuit, and the third input terminal of the signal processing circuit and the output terminal of the voltage output circuit are connected to the load input terminal.

[0007] The signal processing circuit is used to generate a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generate a compensation adjustment signal based on the control signal at the second input terminal and the differential signal.

[0008] The voltage output circuit is used to output voltage according to the compensation adjustment signal to compensate and adjust the load input voltage.

[0009] In some embodiments, the voltage regulator circuit further includes:

[0010] A linear control circuit, wherein the input terminal of the linear control circuit is connected to the I / O interface of the controller, and the control signal output terminal of the linear control circuit is connected to the first input terminal and the second input terminal of the signal processing circuit;

[0011] The linear control circuit is used to generate a linear DC control signal based on the square wave signal from the controller's IO interface, and outputs it to the first and second input terminals of the signal processing circuit through its control signal output terminal.

[0012] In some embodiments, the linear control circuit includes a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, and a second capacitor;

[0013] The first end of the first resistor is connected to the I / O interface of the controller, the second end is connected to the first end of the second resistor, and the second end of the second resistor is connected to the non-inverting input of the first operational amplifier.

[0014] The first end of the third resistor is connected to the inverting input terminal of the first operational amplifier, and the second end is grounded. The first end of the fourth resistor is connected to the inverting input terminal of the first operational amplifier, and the second end is connected to the output terminal of the first operational amplifier.

[0015] The first terminal of the first capacitor is connected to the common terminal of the first resistor and the second resistor, and the second terminal is connected to the output terminal of the first operational amplifier. The first terminal of the second capacitor is connected to the non-inverting input terminal of the first operational amplifier, and the second terminal is grounded.

[0016] In some embodiments, the resistance value of the second resistor is twice the resistance value of the first resistor, the resistance values ​​of the third resistor and the fourth resistor are equal, and the capacitance values ​​of the first capacitor and the second capacitor are equal.

[0017] Alternatively, the resistance values ​​of the first resistor and the second resistor are equal, the resistance value of the third resistor is much greater than the resistance value of the fourth resistor, and the capacitance value of the first capacitor is twice the capacitance value of the second capacitor.

[0018] In some embodiments, the signal processing circuit includes a second operational amplifier, a third operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor;

[0019] The first end of the fifth resistor is connected to the control signal output terminal, and the second end is connected to the non-inverting input terminal of the second operational amplifier. The first end of the seventh resistor is connected to the non-inverting input terminal of the second operational amplifier, and the second end is grounded.

[0020] The first end of the sixth resistor is connected to the load input terminal, and the second end is connected to the inverting input terminal of the second operational amplifier. The first end of the eighth resistor is connected to the inverting input terminal of the second operational amplifier, and the second end is grounded.

[0021] The first end of the ninth resistor is connected to the control signal output terminal, and the second end is connected to the non-inverting input terminal of the third operational amplifier. The first end of the tenth resistor is connected to the output terminal of the second operational amplifier, and the second end is connected to the non-inverting input terminal of the third operational amplifier U3.

[0022] The first end of the eleventh resistor is grounded, and the second end is connected to the inverting input of the third operational amplifier. The first end of the twelfth resistor is connected to the inverting input of the third operational amplifier, and the second end is connected to the output of the third operational amplifier.

[0023] In some embodiments, the resistance values ​​of the fifth resistor and the sixth resistor are equal, and the resistance values ​​of the seventh resistor and the eighth resistor are equal.

[0024] In some embodiments, the voltage output circuit includes a comparator, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a switching device;

[0025] The non-inverting input of the comparator is connected to the output of the third operational amplifier;

[0026] The first end of the thirteenth resistor is connected to the output terminal of the comparator, and the second end is connected to the first end of the switching device. The second end of the switching device is connected to a pull-up voltage.

[0027] The first end of the fourteenth resistor is grounded, the second end is connected to the inverting input of the comparator and the first end of the fifteenth resistor, and the second end of the fifteenth resistor is connected to the third end of the switching device as the output end of the voltage output circuit.

[0028] In some embodiments, the switching device is a metal-oxide-semiconductor field-effect transistor.

[0029] Secondly, a voltage stabilization method is provided, including the following steps:

[0030] The signal processing circuit generates a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generates a compensation adjustment signal based on the control signal at the second input terminal and the differential signal.

[0031] The voltage output circuit outputs a voltage based on the compensation adjustment signal to compensate and adjust the load input voltage.

[0032] In some embodiments, before the step of generating a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generating a compensation adjustment signal based on the control signal at the second input terminal and the differential signal, the signal processing circuit includes:

[0033] The linear control circuit generates a linear DC control signal based on the square wave signal from the controller's I / O interface, and outputs it to the first and second input terminals of the signal processing circuit through its control signal output terminal.

[0034] The beneficial effects of the technical solution provided by this invention include:

[0035] This invention provides a voltage regulator circuit and method, which includes a signal processing circuit and a voltage output circuit. The signal processing circuit generates a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generates a compensation adjustment signal based on the control signal at the second input terminal and the differential signal. The voltage output circuit then outputs a voltage based on the compensation adjustment signal, thereby compensating and adjusting the load input voltage to ensure the accuracy and stability of the power supply to the load. In other words, the voltage regulator circuit of this invention has a voltage compensation function, enabling it to compensate and adjust the power supply voltage at the load input terminal, and is suitable for applications where the load power supply voltage varies and high accuracy is required. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic block diagram of a voltage regulator circuit provided in an embodiment of the present invention;

[0038] Figure 2 The present invention provides a circuit diagram of a voltage regulator circuit. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] This invention provides a voltage regulator circuit that can solve the technical problem in existing power supply circuits where the voltage drop at the load input terminal is large when the downstream load is too large or the power supply trace is too long, resulting in insufficient power supply to the chip.

[0041] See Figure 1As shown, an embodiment of the present invention provides a voltage regulator circuit, including a signal processing circuit and a voltage output circuit.

[0042] The first and second input terminals of the signal processing circuit are connected to the control signal output terminal, the output terminal of the signal processing circuit is connected to the input terminal of the voltage output circuit, and the third input terminal of the signal processing circuit and the output terminal of the voltage output circuit are connected to the load input terminal.

[0043] The signal processing circuit is used to generate a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generate a compensation adjustment signal based on the control signal at the second input terminal and the differential signal.

[0044] The voltage output circuit is used to output voltage according to the compensation adjustment signal to compensate and adjust the load input voltage.

[0045] The voltage regulator circuit in this embodiment of the invention includes a signal processing circuit and a voltage output circuit. The signal processing circuit generates a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generates a compensation adjustment signal based on the control signal at the second input terminal and the differential signal. The voltage output circuit then outputs a voltage based on the compensation adjustment signal, thereby compensating and adjusting the load input voltage to ensure the accuracy and stability of the power supply to the load. In other words, the voltage regulator circuit of this invention has a voltage compensation function, enabling it to compensate and adjust the power supply voltage at the load input terminal, making it suitable for applications where the load power supply voltage varies and high accuracy is required.

[0046] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the voltage regulator circuit further includes a linear control circuit, the input terminal of which is connected to the I / O interface of the controller, and the control signal output terminal of which is connected to the first input terminal and the second input terminal of the signal processing circuit.

[0047] The linear control circuit is used to generate a linear DC control signal based on the square wave signal from the controller's IO interface, and outputs it to the first and second input terminals of the signal processing circuit through its control signal output terminal.

[0048] The voltage regulator circuit of the present invention generates a linear DC control signal based on the square wave signal of the controller's IO interface through a linear control circuit, which can linearly adjust the output voltage of the voltage output circuit.

[0049] Specifically, see Figure 2 As shown, the linear control circuit includes a first operational amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, and a second capacitor C2.

[0050] The first end of the first resistor R1 is connected to the I / O interface of the controller, and the second end is connected to the first end of the second resistor R2. The second end of the second resistor R2 is connected to the non-inverting input of the first operational amplifier U1. The first end of the third resistor R3 is connected to the inverting input of the first operational amplifier U1, and the second end is grounded. The first end of the fourth resistor R4 is connected to the inverting input of the first operational amplifier U1, and the second end is connected to the output of the first operational amplifier U1. The first end of the first capacitor C1 is connected to the common terminal of the first resistor R1 and the second resistor R2, and the second end is connected to the output of the first operational amplifier U1. The first end of the second capacitor C2 is connected to the non-inverting input of the first operational amplifier U1, and the second end is grounded.

[0051] See Figure 2 As shown, the linear control circuit can be understood as a second-order RC active filter circuit. It filters the square wave signal Vin input from the controller's I / O interface into a linear DC control signal Vref1 that meets the requirements. By adjusting the duty cycle of the square wave signal at the controller's I / O interface, the output DC signal is controlled, ultimately achieving real-time linear control of the output voltage. Since only one I / O port of the controller is used, it consumes fewer resources and is easy to implement.

[0052] The specific parameter calculations need to be based on the frequency and amplitude of the input square wave and the filtering output requirements.

[0053] The transfer function of the linear control circuit is:

[0054] , For the DC gain of the circuit, .

[0055] Circuit damping coefficient: .

[0056] In order to The optimal value is 0.707, which is acceptable. , and order ,Right now It can also make , ,make ,Right now , .

[0057] The cutoff frequencies obtained by the above methods are all: In practical applications, for , The value of can be obtained through calculation and simulation based on the frequency and amplitude of the square wave signal input to the controller's I / O port, as well as the required parameters. The amplitude of the output voltage of the voltage output circuit can be linearly adjusted by the duty cycle of the square wave signal.

[0058] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the signal processing circuit includes a second operational amplifier U2, a third operational amplifier U3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12.

[0059] The first end of the fifth resistor R5 is connected to the control signal output terminal, and the second end is connected to the non-inverting input terminal of the second operational amplifier U2. The first end of the seventh resistor R7 is connected to the non-inverting input terminal of the second operational amplifier U2, and the second end is grounded.

[0060] The first end of the sixth resistor R6 is connected to the load input terminal, and the second end is connected to the inverting input terminal of the second operational amplifier U2. The first end of the eighth resistor R8 is connected to the inverting input terminal of the second operational amplifier U2, and the second end is grounded.

[0061] The first end of the ninth resistor R9 is connected to the control signal output terminal, and the second end is connected to the non-inverting input terminal of the third operational amplifier U3. The first end of the tenth resistor R10 is connected to the output terminal of the second operational amplifier U2, and the second end is connected to the non-inverting input terminal of the third operational amplifier U3.

[0062] The first end of the eleventh resistor R11 is grounded, and the second end is connected to the inverting input of the third operational amplifier U3. The first end of the twelfth resistor R12 is connected to the inverting input of the third operational amplifier U3, and the second end is connected to the output of the third operational amplifier U3.

[0063] See Figure 2As shown, the first terminals of the fifth resistor R5 and the sixth resistor R6 respectively receive the linear DC control signal Vref1 from the control signal output terminal and the load input voltage Voc from the load input terminal. After passing through the second operational amplifier U2, a differential signal Vref2 is obtained. Then, after passing through the third operational amplifier U3, the linear DC control signal Vref1 and the differential signal Vref2 are superimposed to obtain a compensation adjustment signal Vref3 with compensation function. The compensation adjustment signal Vref3 is output to the voltage output circuit. The voltage output circuit outputs voltage Vout according to the compensation adjustment signal Vref3. When the load is large or the power supply line is too long, causing a voltage drop at the load input terminal, the compensation adjustment signal Vref3 can dynamically adjust the output voltage Vout of the voltage output circuit to ensure the stability and accuracy of the load input voltage Voc at the load input terminal.

[0064] The transfer function of the signal processing circuit is:

[0065] ;

[0066] , can make , .

[0067] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the voltage output circuit includes a comparator U4, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a switching device Q1. Optionally, the switching device Q1 is a metal-oxide-semiconductor field-effect transistor.

[0068] The non-inverting input of the comparator U4 is connected to the output of the third operational amplifier U3. The first end of the thirteenth resistor R13 is connected to the output of the comparator U4, and the second end is connected to the first end (gate) of the switching device Q1. The second end (drain) of the switching device Q1 is connected to a pull-up voltage.

[0069] The first terminal of the fourteenth resistor R14 is grounded, and the second terminal is connected to the inverting input terminal of the comparator U4 and the first terminal of the fifteenth resistor R15. The second terminal of the fifteenth resistor R15 is connected to the third terminal (source) of the switching device Q1 as the output terminal of the voltage output circuit.

[0070] Specifically, the non-inverting input of the comparator U4 is a compensation adjustment signal with compensation function, and the inverting input of the comparator U4 is the value V- obtained by dividing the output voltage Vout through the fourteenth resistor R14 and the fifteenth resistor R15. The compensation adjustment signal Vref3 and V- are compared by the comparator U4 to output a driving voltage to drive the switching state of the switching device Q1, thereby controlling the output voltage Vout. The structure is simple and the control is convenient.

[0071] The transfer function of the power supply output voltage is:

[0072] By adjusting the fourteenth resistor R14 and the fifteenth resistor R15, the linear relationship between Vref3 and Vout can be changed, and Vout can also be adjusted.

[0073] This invention provides a voltage stabilization method, comprising the following steps:

[0074] The signal processing circuit generates a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generates a compensation adjustment signal based on the control signal at the second input terminal and the differential signal.

[0075] The voltage output circuit outputs a voltage based on the compensation adjustment signal to compensate and adjust the load input voltage.

[0076] The voltage regulation method in this embodiment of the invention can compensate and adjust the power supply voltage at the load input terminal, and is suitable for applications where the load power supply voltage is variable and requires high precision.

[0077] As an optional implementation, in one embodiment of the invention, before the step of the signal processing circuit generating a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generating a compensation adjustment signal based on the control signal at the second input terminal and the differential signal, the following steps are included:

[0078] The linear control circuit generates a linear DC control signal based on the square wave signal from the controller's I / O interface, and outputs it to the first and second input terminals of the signal processing circuit through its control signal output terminal.

[0079] The voltage regulation method of the present invention generates a linear DC control signal based on the square wave signal of the controller's IO interface through a linear control circuit, which can linearly adjust the output voltage of the voltage output circuit.

[0080] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0081] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0082] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A voltage regulator circuit, characterized in that, include: Linear control circuit, signal processing circuit, and voltage output circuit; The input terminal of the linear control circuit is connected to the I / O interface of the controller, and the control signal output terminal of the linear control circuit is connected to the first input terminal and the second input terminal of the signal processing circuit. The linear control circuit is used to generate a linear DC control signal based on the square wave signal of the I / O interface of the controller, and outputs it to the first input terminal and the second input terminal of the signal processing circuit through its control signal output terminal. The output terminal of the signal processing circuit is connected to the input terminal of the voltage output circuit, and the third input terminal of the signal processing circuit and the output terminal of the voltage output circuit are connected to the load input terminal. The signal processing circuit is used to generate a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generate a compensation adjustment signal based on the control signal at the second input terminal and the differential signal. The voltage output circuit is used to output voltage according to the compensation adjustment signal to compensate and adjust the load input voltage.

2. The voltage regulator circuit according to claim 1, characterized in that: The linear control circuit includes a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, and a second capacitor; The first end of the first resistor is connected to the I / O interface of the controller, and the second end is connected to the first end of the second resistor. The second end of the second resistor is connected to the non-inverting input of the first operational amplifier. The first end of the third resistor is connected to the inverting input terminal of the first operational amplifier, and the second end is grounded. The first end of the fourth resistor is connected to the inverting input terminal of the first operational amplifier, and the second end is connected to the output terminal of the first operational amplifier. The first terminal of the first capacitor is connected to the common terminal of the first resistor and the second resistor, and the second terminal is connected to the output terminal of the first operational amplifier. The first terminal of the second capacitor is connected to the non-inverting input terminal of the first operational amplifier, and the second terminal is grounded.

3. The voltage regulator circuit according to claim 2, characterized in that: The resistance of the second resistor is twice that of the first resistor, the resistances of the third resistor and the fourth resistor are equal, and the capacitances of the first capacitor and the second capacitor are equal. Alternatively, the resistance values ​​of the first resistor and the second resistor are equal, the resistance value of the third resistor is much greater than the resistance value of the fourth resistor, and the capacitance value of the first capacitor is twice the capacitance value of the second capacitor.

4. The voltage regulator circuit according to claim 1, characterized in that: The signal processing circuit includes a second operational amplifier, a third operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor; The first end of the fifth resistor is connected to the control signal output terminal, and the second end is connected to the non-inverting input terminal of the second operational amplifier. The first end of the seventh resistor is connected to the non-inverting input terminal of the second operational amplifier, and the second end is grounded. The first end of the sixth resistor is connected to the load input terminal, and the second end is connected to the inverting input terminal of the second operational amplifier. The first end of the eighth resistor is connected to the inverting input terminal of the second operational amplifier, and the second end is grounded. The first end of the ninth resistor is connected to the control signal output terminal, and the second end is connected to the non-inverting input terminal of the third operational amplifier. The first end of the tenth resistor is connected to the output terminal of the second operational amplifier, and the second end is connected to the non-inverting input terminal of the third operational amplifier U3. The first end of the eleventh resistor is grounded, and the second end is connected to the inverting input of the third operational amplifier. The first end of the twelfth resistor is connected to the inverting input of the third operational amplifier, and the second end is connected to the output of the third operational amplifier.

5. The voltage regulator circuit according to claim 4, characterized in that: The fifth resistor and the sixth resistor have the same resistance value, and the seventh resistor and the eighth resistor have the same resistance value.

6. The voltage regulator circuit according to claim 4, characterized in that: The voltage output circuit includes a comparator, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a switching device; The non-inverting input of the comparator is connected to the output of the third operational amplifier; The first end of the thirteenth resistor is connected to the output terminal of the comparator, and the second end is connected to the first end of the switching device. The second end of the switching device is connected to a pull-up voltage. The first end of the fourteenth resistor is grounded, the second end is connected to the inverting input of the comparator and the first end of the fifteenth resistor, and the second end of the fifteenth resistor is connected to the third end of the switching device as the output end of the voltage output circuit.

7. The voltage regulator circuit according to claim 6, characterized in that: The switching device is a metal-oxide-semiconductor field-effect transistor.

8. A voltage regulation method, using the voltage regulation circuit according to any one of claims 1 to 7, characterized in that, Includes the following steps: The linear control circuit generates a linear DC control signal based on the square wave signal from the controller's I / O interface, and outputs it to the first and second input terminals of the signal processing circuit through its control signal output terminal. The signal processing circuit generates a differential signal based on the control signal at the first input terminal and the load input voltage at the third input terminal, and then generates a compensation adjustment signal based on the control signal at the second input terminal and the differential signal. The voltage output circuit outputs a voltage based on the compensation adjustment signal to compensate and adjust the load input voltage.

Images