Power supply circuit

Abstract

To provide a power supply circuit.SOLUTION: A power supply circuit provides power to a system on chip, and includes a power generation circuit, a first feedback circuit, a conducting wire, a second feedback circuit, and a compensation circuit. The power generation circuit adjusts the input voltage according to the first feedback voltage so as to generate an output voltage. The first feedback circuit is coupled to the power generation circuit, and generates the first feedback voltage according to the output voltage. The conducting wire is coupled between the power generation circuit and the system on chip so as to receive the output voltage, and supplies, as a load voltage, the output voltage to the system on chip. The second feedback circuit is connected to the conducting wire, and generates a second feedback voltage according to the load voltage. The compensation circuit adjusts the first feedback voltage according to the second feedback voltage.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply circuit, and more particularly to a power supply circuit having two feedback circuits. [Background technology]

[0002] In everyday life, electronic products require power to operate the electronic circuits within them. The quality of the power supply affects the performance of the electronic circuits. However, signals are easily disturbed by power supply interference. In addition, the voltage drop and ripple voltage caused by the impedance of the electronic product's printed circuit board also affect the power supply level, which in turn affects the overall performance of the electronic circuits. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE INVENTION The present invention aims to provide a power supply circuit that solves the above-mentioned problems. [Means for solving the problem]

[0004] According to one embodiment of the present invention, a power supply circuit supplies power to a system-on-chip (SOC) and includes a power generation circuit, a first feedback circuit, a conductor, a second feedback circuit, and a compensation circuit. The power generation circuit adjusts an input voltage based on a first feedback voltage to generate an output voltage. The first feedback circuit is connected to the power generation circuit and generates a first feedback voltage based on the output voltage. The conductor connects between the power generation circuit and the SOC to receive the output voltage and provide the output voltage as a load voltage to the SOC. The second feedback circuit is connected to the conductor and generates a second feedback voltage based on the load voltage. The compensation circuit adjusts the first feedback voltage based on the second feedback voltage and includes an operational amplifier, a first resistor, a second resistor, and a third resistor. The operational amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal. The non-inverting input terminal receives the second feedback voltage. The inverting input terminal is connected to a node. The first resistor is connected between an output terminal and the node. The second resistor is connected between the node and a ground terminal. The third resistor is connected between the output terminal and the first feedback circuit. In response to the second feedback voltage being greater than the first reference voltage, the compensation circuit increases the first feedback voltage. In response to the first feedback voltage being greater than the second reference voltage, the power generation circuit decreases the output voltage. In response to the second feedback voltage being less than the first reference voltage, the compensation circuit decreases the first feedback voltage. In response to the first feedback voltage being less than the second reference voltage, the power generation circuit increases the output voltage.

[0005] According to another embodiment, a power supply circuit supplies power to a system-on-chip (SOC) and includes a power generation circuit, a first feedback circuit, a conductor, a second feedback circuit, and a compensation circuit. The power generation circuit adjusts an input voltage based on a first feedback voltage to generate an output voltage. The first feedback circuit is connected to the power generation circuit and generates a first feedback voltage based on the output voltage. The conductor connects between the power generation circuit and the SOC to receive the output voltage and provide the output voltage to the SOC as a load voltage. The second feedback circuit is connected to the conductor and generates a second feedback voltage based on the load voltage. The compensation circuit adjusts the first feedback voltage based on the second feedback voltage and includes an analog-to-digital converter, a processing circuit, a digital-to-analog converter, and a resistor. The analog-to-digital converter converts the second feedback voltage to generate a digital signal. The processing circuit calculates and outputs a difference between the digital signal and a predetermined value. The digital-to-analog converter converts the difference to generate an analog signal. The resistor is connected between the digital-to-analog converter and the second feedback circuit to receive the analog signal.

[0006] According to another embodiment, a power supply circuit supplies power to a system-on-chip (SOC) and includes a power generation circuit, a first feedback circuit, a conductor, a second feedback circuit, and a compensation circuit. The power generation circuit adjusts an input voltage based on a first feedback voltage to generate an output voltage. The first feedback circuit is connected to the power generation circuit and generates a first feedback voltage based on the output voltage. The conductor connects between the power generation circuit and the SOC to receive the output voltage and provide the output voltage as a load voltage to the SOC. The second feedback circuit is connected to the conductor and generates a second feedback voltage based on the load voltage. The compensation circuit adjusts the first feedback voltage based on the second feedback voltage and includes an operational amplifier, an inverter, a first resistor, a second resistor, and a third resistor. The operational amplifier has a non-inverting input terminal, an inverting input terminal, and a first output terminal. The inverting input terminal receives the second feedback voltage. The non-inverting input terminal is connected to a node. The inverter has an input terminal and a second output terminal. The input terminal is connected to the first output terminal. The first resistor is connected between the second output terminal and the node. The second resistor is connected between the node and a ground terminal. The third resistor is connected between the second output terminal and the first feedback circuit. In response to the second feedback voltage being greater than the first reference voltage, the compensation circuit increases the first feedback voltage. In response to the first feedback voltage being greater than the second reference voltage, the power generation circuit decreases the output voltage. In response to the second feedback voltage being less than the first reference voltage, the compensation circuit decreases the first feedback voltage. In response to the first feedback voltage being less than the second reference voltage, the power generation circuit increases the output voltage. [Effects of the Invention]

[0007] This improves upon the conventional problems that signals are easily disturbed by power supply interference, voltage drops caused by the impedance of printed circuit boards, and ripple voltages affect the power supply level and thus the performance of electronic circuits. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing a power supply system according to the present invention; [Figure 2] FIG. 2 is a diagram illustrating a compensation circuit according to the present invention. [Figure 3] FIG. 2 is another diagram showing a compensation circuit according to the present invention. [Figure 4] FIG. 2 is another diagram showing a compensation circuit according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described with respect to particular embodiments and with reference to certain drawings but the invention is not limited thereto but only by the claims. The drawings described are schematic only and are non-limiting. In the drawings, the size of some of the elements may be exaggerated for illustrative purposes and may not be drawn to scale. The dimensions and relative dimensions do not correspond to actual dimensions in the practice of the invention.

[0010] FIG. 1 is a diagram showing a power supply system according to the present invention. 1, the power supply system 100 includes a power supply circuit 110 and a system-on-chip (SOC) 120. The power supply circuit 110 supplies power to the SOC 120 to drive the SOC 120. In this embodiment, the power supply circuit 110 includes a power generation circuit 111, a conductor 112, feedback circuits 113 and 115, and a compensation circuit 114. The power generation circuit 111 generates an input voltage V IN Adjust the output voltage V OUT Generate.

[0011] The present invention does not limit the configuration of the power generation circuit 111. In one embodiment, the power generation circuit 111 is a boost converter circuit. IN and the result of the boost is output as the output voltage V OUT In this case, the output voltage VOUT is the input voltage V IN It will become higher. In another embodiment, the power generating circuit 111 is a buck converter. The power generating circuit 111 receives an input voltage V IN The result of the step-down is the output voltage V OUT In this case, the output voltage V OUT is the input voltage V IN It will be lower. In another embodiment, the power generating circuit 111 is a regulator and generates an output voltage V OUT In this case, the output voltage V OUT is the input voltage V IN It will be lower.

[0012] In this embodiment, the power generation circuit 111 generates a feedback voltage V FB1 Based on the output voltage V OUT Further adjust. For example, the feedback voltage V FB1 is the reference voltage V REF1 (also called the second reference voltage), when the output voltage V OUT Therefore, the power generating circuit 111 may output an output voltage V OUT Boost the voltage. Feedback voltage V FB1 is the reference voltage V REF1 When the output voltage V OUT indicates that the output voltage V may be higher than the first predetermined value (for example, 3V). OUT Lowers the pressure.

[0013] In one embodiment, the power generation circuit 111 includes an input capacitor C IN , a voltage converter circuit 116, an inductor Lx, and an output capacitor C OUT However, the present invention provides In this embodiment, the voltage converter circuit 116 converts the input voltage V INand the input capacitor C IN The voltage converter circuit 116 is connected to the feedback voltage V FB1 Based on the input voltage V IN By adjusting the converter voltage V T The configuration of the voltage converter circuit 116 is not a limitation of the present invention. In one embodiment, the voltage converter circuit 116 includes an operational amplifier 117 . In one embodiment, the operational amplifier 117 is a comparator.

[0014] Feedback voltage V FB1 is the reference voltage V REF1 When the voltage converter circuit 116 detects the voltage V 1 , the operational amplifier 117 may output a first level of low potential. T (e.g., lowering the pressure). Feedback voltage V FB1 is the reference voltage V REF1 When the voltage converter circuit 116 detects the voltage V 1 , the operational amplifier 117 may output a second level of high potential. T (e.g., boosting the voltage). The voltage converter circuit 116 generates a converter voltage V T is output to connect the inductor Lx and the output capacitor C OUT By controlling the charging and discharging of the output node ND O The output voltage V OUT to provide.

[0015] As shown in FIG. 1, the inductor Lx couples the voltage converter circuit 116 to the output node ND O The output capacitor C is connected between OUT is the output node ND O and the ground terminal GND. O is the output terminal of the power generation circuit 111. The output node ND O The voltage at the output voltage VOUT It is called.

[0016] The present invention is directed to a voltage converter circuit 116 that converts the feedback voltage V FB1 Based on the converter voltage V T The method for adjusting the value is not limited. In one embodiment, the feedback voltage V FB1 is the reference voltage V REF1 When the voltage converter circuit 116 is higher, the converter voltage V T Lowers the pressure. Feedback voltage V FB1 is the reference voltage V REF1 When the voltage converter circuit 116 is lower than the converter voltage V T Boost the voltage.

[0017] The feedback circuit 113 is connected to the power generation circuit 111 and outputs an output voltage V OUT Based on the feedback voltage V FB1 Generate. In one embodiment, the feedback circuit 113 is a voltage divider circuit (first voltage divider circuit) that divides the output voltage V OUT Perform a voltage divider on the feedback voltage V FB1 Generate. In this embodiment, the feedback circuit 113 includes resistors R1 and R2. Resistors R1 and R2 are connected to the output node ND O and the ground terminal GND.

[0018] The conductor 112 is connected between the power generating circuit 111 and the SOC 120, and outputs an output voltage V OUT is sent to the power input pin PIN of SOC120. In this embodiment, the conductor 112 is connected to an output voltage V OUT , the load voltage V LOAD and the load voltage V LOAD is supplied to the power input pin PIN of SOC120 to drive SOC120. In this embodiment, the load voltage V LOADis the voltage that the SOC 120 actually receives and also functions as the operating voltage of the SOC 120. In some embodiments, the equivalent resistance of the conductor 112 causes a voltage drop, so that the load voltage V LOAD is the output voltage V OUT It could be lower.

[0019] A feedback circuit 115 is connected to the conductor 112 and is connected to the load voltage V LOAD Based on the feedback voltage V FB2 Generate. In one embodiment, the feedback circuit 115 is a voltage divider circuit (second voltage divider circuit) that divides the load voltage V LOAD Voltage division is performed on the feedback voltage V FB2 The present invention generates a feedback voltage V FB2 The magnitude of the feedback voltage V FB2 is the feedback voltage V FB1 It can be higher or lower. In one embodiment, the feedback voltage V FB2 is 0.4V, and the feedback voltage V FB1 is 0.8V.

[0020] In this embodiment, the feedback circuit 115 includes resistors R3 and R4. Resistors R3 and R4 are connected in series between the power supply input pin PIN of SOC 120 and the ground terminal GND. In some embodiments, the feedback circuit 115 is located near one end of the conductor 112 (i.e., the end of the conductor 112 closer to the SOC 120), and the feedback circuit 113 is located near the other end of the conductor 112 (i.e., the end of the conductor 112 closer to the power generation circuit 111). Because feedback circuit 115 is closer to SOC 120 than feedback circuit 113, the feedback voltage V FB2 is the load voltage V LOAD This can better reflect changes in

[0021] The compensation circuit 114 calculates the feedback voltage V FB2 Based on the feedback voltage V FB1 For example, adjust the feedback voltage V FB2 When is too large, the output voltage V OUT Therefore, the compensation circuit 114 reduces the feedback voltage V FB1 is boosted, and the power generation circuit 111 outputs the output voltage V OUT The feedback voltage V FB2 When is too small, the output voltage V OUT Therefore, the compensation circuit 114 reduces the feedback voltage V FB1 The power generation circuit 111 reduces the output voltage V OUT Boost the voltage.

[0022] Due to the effect of the equivalent resistance of the conductor 112, the conductor 112 OUT When transmitting this voltage to the power input pin PIN of the SOC120, the voltage that the power input pin PIN actually receives (i.e., the load voltage V LOAD ) is the output voltage V OUT It could be lower. However, since feedback circuit 115 is closer to SOC 120 than feedback circuit 113, the feedback voltage V FB2 is the load voltage V LOAD This can better reflect changes in The compensation circuit 114 calculates the feedback voltage V FB2 Based on the change in the feedback voltage V FB1 By appropriately adjusting the output voltage V OUT Adjust the load voltage V LOAD This compensates for the voltage drop due to the equivalent resistance of the conductor 112.

[0023] The compensation circuit 114 generates a feedback voltage V FB1By adjusting the voltage drop caused by the conductor 112, the voltage error value caused by poor layout of the printed circuit board (PCB) can be reduced, and the power supply quality of the power generation circuit 111 can be improved. In some embodiments, the load voltage V LOAD is the reference voltage V REF1 It can be higher or lower.

[0024] Furthermore, for chips manufactured using advanced manufacturing processes, the load voltage V LOAD The ripple component of the core voltage must be less than 2% of the core voltage. For example, the load voltage V LOAD is 0.6V, the ripple voltage must be lower than 10mV. However, due to noise interference, the SOC 120 may experience a ripple voltage of more than 20 mV. In this case, the compensation circuit 114 reduces the feedback voltage V FB2 Based on the feedback voltage V FB1 Adjust the feedback voltage V FB2 reflects the ripple voltage, the compensation circuit 114 can also compensate for voltage fluctuations due to the ripple voltage. The compensation circuit 114 compensates for the load voltage V LOAD This stabilizes the quality of the product, ensuring the performance of the SOC120.

[0025] In other embodiments, the feedback circuit 113 is located close to the power generation circuit 111, so that the feedback voltage V FB1 is also the output voltage V OUT Therefore, the voltage converter circuit 116 can reflect the change in the feedback voltage V FB1 Based on the output voltage V OUT is stabilized at a first predetermined value, such as 3V.

[0026] Two-stage feedback control controls the output voltage V OUT The level stabilizes. The two-stage feedback control is LOAD When changes, the feedback voltage V FB1 By adjusting the output voltage V OUT Adjust the load voltage V LOAD Maintain the quality and stabilize the performance of SOC120.

[0027] In some embodiments, the power generation circuit 111 includes a load capacitor C LOAD It further has a load capacitor C LOAD is connected in parallel to the feedback circuit 115 and close to the power input pin PIN of the SOC 120. In some embodiments, the compensation circuit 114 is integrated into the SOC 120 . In this case, the SOC 120 further has an input pin (not shown) and an output pin (not shown). The input pin is connected to a feedback voltage V FB2 The output pin is connected to a feedback circuit 115 to receive a feedback voltage V FB1 is connected to a feedback circuit 113 to adjust

[0028] 2 is a diagram illustrating the compensation circuit of the present invention. As shown in FIG. 2, the compensation circuit 114 includes an analog-to-digital converter (ADC) 210, a digital-to-analog converter (DAC) 220, a processing circuit 230, and a resistor R S The ADC210 receives the feedback voltage V FB2 is converted from analog format to digital format to generate a digital signal S D The processing circuit 230 generates the digital signal S D and a second predetermined value, and provides the difference value to DAC 220. The configuration of processing circuit 230 is not limited in this disclosure. In one embodiment, processing circuit 230 includes a central processing unit (CPU), a microcontroller (MCU), or a digital signal processor (DSP).

[0029] The DAC 220 converts the difference value output by the processing circuit 230 from a digital format to an analog format, and outputs the analog signal S A Generates a resistor R S is connected between the DAC 220 and the feedback circuit 113, and outputs the analog signal S A Accept. In one embodiment, DAC 220 is a current digital-to-analog converter (iDAC) that outputs (sources) current to or sinks (sinks) current from feedback circuit 113 to generate a feedback voltage V FB1 Achieve the purpose of adjusting. For example, when the DAC 220 outputs a current to the feedback circuit 113, the feedback voltage V FB1 When the DAC 220 extracts the current of the feedback circuit 113, the feedback voltage V FB1 will lower the blood pressure.

[0030] 3 is another diagram illustrating the compensation circuit of the present invention. The compensation circuit 114 includes an operational amplifier 310 and resistors 320, 330, and 340. The non-inverting input terminal of the operational amplifier 310 receives the feedback voltage V FB2 The inverting input terminal of the operational amplifier 310 is connected to the node ND1, and the reference voltage V REF2 (Alternatively, referred to as a first reference voltage). Resistor 330 is connected between the output terminal of operational amplifier 310 and feedback circuit 113. In one embodiment, the resistance of resistor 330 is 0 Ω. In another embodiment, resistor 330 can be omitted.

[0031] The resistor 320 is connected between the output terminal of the operational amplifier 310 and the node ND1. The resistor 340 is connected between the node ND1 and the ground terminal GND. In this embodiment, resistors 320 and 340 form a voltage divider circuit and generate a reference voltage V REF2Generate. In some embodiments, the reference voltage V REF2 is the reference voltage V of the voltage converter circuit 116 REF1 Lower.

[0032] In this embodiment, the operational amplifier 310 generates a feedback voltage V FB2 and the reference voltage V REF2 The output differential voltage VO1 is generated based on the difference between the feedback voltage V FB2 is the reference voltage V REF2 When the feedback voltage V is higher, the output differential voltage V is a positive differential voltage. FB2 is the reference voltage V REF2 When it is lower, the output differential voltage VO1 becomes a negative differential voltage. In this embodiment, the operational amplifier 310 generates a feedback voltage V FB2 and the reference voltage V REF2 The difference between the FB1 Adjust.

[0033] For example, the feedback voltage V FB2 is the reference voltage V REF2 When the output differential voltage V01 is higher, the output differential voltage V01 is a positive differential voltage, so the current flowing through the resistor 330 and into the feedback circuit 113 increases. FB1 is boosted. On the other hand, the feedback voltage V FB2 is the reference voltage V REF2 When the output differential voltage V01 is lower, the current flowing from the feedback circuit 113 through the resistor 330 increases because the output differential voltage V01 is a negative differential voltage. FB1 decreases blood pressure.

[0034] In other embodiments, operational amplifier 310 is used to output or extract current from feedback circuit 113 to generate feedback voltage V FB1 can also be varied. For example, when operational amplifier 310 outputs a current to feedback circuit 113, the feedback voltage V FB1 When the operational amplifier 310 extracts the current of the feedback circuit 113, the feedback voltage V FB1 will lower the blood pressure.

[0035] In some embodiments, the operational amplifier 310 is placed near the power input pin PIN of the SOC 120 and is connected to the load voltage V LOAD , and dynamically adjusts the magnitude of the current flowing into the feedback circuit 113, and adjusts the output voltage V OUT Adjust the load voltage V LOAD The operational amplifier 310 also compensates for changes in the feedback voltage V FB2 Based on the change in the load voltage V LOAD The output voltage V is determined to be excessively large or not, and the amount of current flowing into the feedback circuit 113 is controlled based on the amount of the ripple voltage. OUT to compensate for the effects caused by the ripple voltage.

[0036] In addition, the operational amplifier 310 outputs a feedback voltage V FB2 Based on the change in the load voltage V LOAD is affected by an excessive voltage drop caused by the current flowing through the conductor 112. LOAD When V changes significantly, operational amplifier 310 controls the amount of current flowing into feedback circuit 113 based on the voltage drop across conductor 112 to produce an output voltage V OUT and adjusts the load voltage V generated by the current flowing through the conductor 112. LOAD Compensate for the voltage drop.

[0037] 4 is another diagram illustrating the compensation circuit of the present invention. The compensation circuit 114 includes an operational amplifier 410, an inverter 420, and resistors 430, 440, and 450. The non-inverting input terminal of the operational amplifier 410 is connected to node ND2, and the reference voltage V REF2The inverting input terminal of the operational amplifier 410 receives the feedback voltage V FB2 The input terminal of the inverter 420 is connected to the output terminal of the operational amplifier 410.

[0038] Resistor 430 is connected between the output terminal of inverter 420 and feedback circuit 113 . In one embodiment, resistor 430 is 0 ohms. In another embodiment, resistor 430 can be omitted. Resistor 440 is connected between the output terminal of inverter 420 and node ND2. The resistor 450 is connected between the node ND2 and the ground terminal GND. In this embodiment, resistors 440 and 450 form a voltage divider circuit to process the output of inverter 420 and ensure that the processed voltage is equal to the reference voltage V REF2 This becomes:

[0039] In this embodiment, the operational amplifier 410 generates a feedback voltage V FB2 and the reference voltage V REF2 and generates an output differential voltage VO2 based on the difference value between them. Feedback voltage V FB2 is the reference voltage V REF2 When the voltage V is higher than the reference voltage V, the output differential voltage V becomes a negative differential voltage. The inverter 420 inverts the output differential voltage V and outputs a positive differential voltage. At this time, the current flowing through the resistor 430 and into the feedback circuit 113 increases. Therefore, the feedback voltage V FB1 is boosted. Feedback voltage V FB2 is the reference voltage V REF2 When the voltage V is lower than the reference voltage V, the output differential voltage V becomes a positive differential voltage. The inverter 420 inverts the output differential voltage V and outputs a negative differential voltage. At this time, a portion of the current flows from the feedback circuit 113 to the resistor 430. Therefore, the feedback voltage V FB1 decreases blood pressure.

[0040] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, it is understood that these terms, as defined in commonly used dictionaries, should be interpreted to have a meaning consistent with the relevant art and the context or background of this review, and should not be interpreted in an idealized or overly formal manner. In this specification, terms such as "first" and "second" are used to distinguish between components and are not intended to limit the components. These terms are used simply as symbols to distinguish one component from another, and in the claims, terms such as "first" and "second" are merely symbols for identification and are not intended to impose numerical limitations on the objects.

[0041] Although the present invention has been disclosed with reference to the preferred embodiments described above, the present invention is not limited thereto, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. For example, the systems, devices, and methods described in the embodiments of the present invention can be realized by hardware, software, or a combination of hardware and software. Therefore, the scope of protection of the present invention is defined by the contents of the claims. [Explanation of symbols]

[0042] 100 power supply system, 110 power supply circuit, 111 power generation circuit, 112 conductor, 113, 115 feedback circuit, 114 compensation circuit, 116 voltage converter circuit, 117 operational amplifier, 120 system on chip (SOC), PIN power input pin, V FB1 , V FB2 Feedback voltage, V IN Input voltage, V OUT Output voltage, V REF1 , V REF2Reference voltage, C IN Input capacitor, Lx inductor, C OUT Output capacitor, V T Converter voltage, ND O Output nodes, R1 to R4, R S , 320, 330, 340, 430, 440, 450 Resistor, GND Ground terminal, V LOAD Load voltage, C LOAD Load capacitor, 210 analog-to-digital converter (ADC), 220 digital-to-analog converter (DAC), 230 processing circuit, S D Digital signal, S A Analog signals, 310, 410 operational amplifiers, 420 inverters.

Claims

1. A power supply circuit for supplying power to a system-on-chip, comprising: a power generation circuit that adjusts the input voltage based on the first feedback voltage to generate an output voltage; a first feedback circuit connected to the power generation circuit and generating the first feedback voltage based on the output voltage; a conductor connecting the power generation circuit and the system-on-chip, receiving the output voltage and supplying the output voltage to the system-on-chip as a load voltage; a second feedback circuit connected to the conductor and generating a second feedback voltage based on the load voltage; and a compensation circuit that adjusts the first feedback voltage based on the second feedback voltage; When the second feedback voltage is higher than a first reference voltage, the compensation circuit increases the first feedback voltage; When the first feedback voltage is higher than a second reference voltage, the power generating circuit reduces the output voltage; When the second feedback voltage is lower than the first reference voltage, the compensation circuit reduces the first feedback voltage; When the first feedback voltage is lower than the second reference voltage, the power generating circuit increases the output voltage; The compensation circuit an operational amplifier having a non-inverting input terminal, an inverting input terminal, and an output terminal, the non-inverting input terminal receiving the second feedback voltage and the inverting input terminal connected to a node; a first resistor connected between the output terminal and the node; a second resistor connected between the node and a ground terminal; a third resistor connected between the output terminal and the first feedback circuit; A power supply circuit comprising:

2. 2. The power supply circuit according to claim 1, wherein the second feedback circuit is closer to the system-on-chip than the first feedback circuit.

3. the first feedback circuit is a first voltage divider circuit, which divides the output voltage to generate the first feedback voltage; 2. The power supply circuit according to claim 1, wherein the second feedback circuit is a second voltage divider circuit that divides the load voltage to generate the second feedback voltage.

4. 2. The power supply circuit according to claim 1, wherein the first reference voltage is lower than the second reference voltage.

5. When the second feedback voltage is higher than the first reference voltage, the current flowing from the output terminal through the third resistor and into the first feedback circuit increases; 2. The power supply circuit according to claim 1, wherein when the second feedback voltage is lower than the first reference voltage, a current flowing from the output terminal through the third resistor and into the first feedback circuit decreases.

6. 2. The power supply circuit according to claim 1, wherein the compensation circuit is incorporated into the system-on-chip.

7. A power supply circuit for supplying power to a system-on-chip, a power generation circuit that adjusts the input voltage based on the first feedback voltage to generate an output voltage; a first feedback circuit connected to the power generation circuit and generating the first feedback voltage based on the output voltage; a conductor connecting the power generation circuit and the system-on-chip, receiving the output voltage and supplying the output voltage to the system-on-chip as a load voltage; a second feedback circuit connected to the conductor and generating a second feedback voltage based on the load voltage; and a compensation circuit that adjusts the first feedback voltage based on the second feedback voltage; The compensation circuit an analog-to-digital converter that converts the second feedback voltage to generate a digital signal; a processing circuit for calculating a difference between the digital signal and a predetermined value; a digital-to-analog converter that converts the difference value to generate an analog signal, and a resistor that is connected between the digital-to-analog converter and the first feedback circuit and that receives the analog signal.

8. A power supply circuit for supplying power to a system-on-chip, comprising: a power generation circuit that adjusts the input voltage based on the first feedback voltage to generate an output voltage; a first feedback circuit connected to the power generation circuit and generating the first feedback voltage based on the output voltage; a conductor connecting the power generation circuit and the system-on-chip, receiving the output voltage and supplying the output voltage to the system-on-chip as a load voltage; a second feedback circuit connected to the conductor and generating a second feedback voltage based on the load voltage; and a compensation circuit that adjusts the first feedback voltage based on the second feedback voltage; When the second feedback voltage is higher than a first reference voltage, the compensation circuit increases the first feedback voltage; When the first feedback voltage is higher than a second reference voltage, the power generating circuit reduces the output voltage; When the second feedback voltage is lower than the first reference voltage, the compensation circuit reduces the first feedback voltage; When the first feedback voltage is lower than the second reference voltage, the power generating circuit increases the output voltage; The compensation circuit an operational amplifier having a non-inverting input terminal, an inverting input terminal, and a first output terminal, the inverting input terminal receiving the second feedback voltage and the non-inverting input terminal being connected to a node; an inverter having an input terminal and a second output terminal, the input terminal connected to the first output terminal; a first resistor connected between the second output terminal and the node; a second resistor connected between the node and a ground terminal; and a third resistor connected between the second output terminal and the first feedback circuit; A power supply circuit comprising:

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