Power 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 drive the electronic circuits within them. The quality of the power supply affects the performance of the electronic circuits. However, signals are susceptible to interference from the power supply. Furthermore, voltage drops and ripple voltages caused by the impedance of the printed circuit board of the electronic product also affect the power supply level and thus the overall performance of the electronic circuit. [Overview of the Initiative] [Problems that the invention aims to solve]

[0003] The present invention aims to provide a power supply circuit and solve 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-a-chip (SOC) and includes a power generation circuit, a first feedback circuit, a wire, a second feedback circuit, and a compensation circuit. The power generation circuit adjusts the input voltage based on the first feedback voltage to generate an output voltage. The first feedback circuit is connected to the power generation circuit and generates the first feedback voltage based on the output voltage. A wire connects the power generation circuit and the SOC, receives the output voltage, and supplies the output voltage to the SOC as a load voltage. The second feedback circuit is connected to the wire and generates the 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 one node. The first resistor is connected between the output terminal and the node. The second resistor is connected between the node and the ground terminal. The third resistor is connected between the output terminal and the first feedback circuit. In response to the second feedback voltage being higher than the first reference voltage, the compensation circuit increases the first feedback voltage. In response to the first feedback voltage being higher than the second reference voltage, the generator circuit decreases the output voltage. In response to the second feedback voltage being lower than the first reference voltage, the compensation circuit decreases the first feedback voltage. In response to the first feedback voltage being lower than the second reference voltage, the generator circuit increases the output voltage.

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

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

[0007] This technology addresses the conventional problems of signals being easily interfered with by power supply interference, voltage drops due to the impedance of printed circuit boards, and ripple voltages affecting the power supply level and thus impacting the performance of electronic circuits. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram showing the power supply system according to the present invention. [Figure 2] This is a diagram showing the compensation circuit in the present invention. [Figure 3] This is another diagram showing the compensation circuit in the present invention. [Figure 4] This is another diagram showing the compensation circuit in the present invention. [Modes for carrying out the invention]

[0009] The present invention is described with reference to specific drawings in relation to certain embodiments, but is not limited thereto and is limited only by the claims. The drawings described are schematic and not limiting. In the drawings, the sizes of some elements are exaggerated for illustrative purposes and may not be drawn to a certain scale. Dimensions and relative dimensions do not correspond to actual dimensions in the implementation of the present invention.

[0010] Figure 1 shows a power supply system according to the present invention. As shown in Figure 1, the power supply system 100 includes a power supply circuit 110 and a system-on-a-chip (SOC) 120. The power supply circuit 110 supplies power to the SOC 120 to drive it. In this embodiment, the power supply circuit 110 includes a power generation circuit 111, conductors 112, feedback circuits 113 and 115, and a compensation circuit 114. The power generation circuit 111 receives an input voltage V IN Adjust the output voltage V OUT Generates.

[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. The power generation circuit 111 receives an input voltage V IN The voltage is increased, and the result after the increase is the output voltage V. OUT Let's assume that in this case, the output voltage VOUT is the input voltage V IN which is higher. In another embodiment, the power generation circuit 111 is a buck converter. The power generation circuit 111 receives the input voltage V IN steps down the voltage, and takes the stepped-down result as the output voltage V OUT . In this case, the output voltage V OUT is the input voltage V IN which is lower. In other embodiments, the power generation circuit 111 is a regulator that stabilizes the output voltage V OUT . In this case, the output voltage V OUT is the input voltage V IN which is lower.

[0012] In this embodiment, the power generation circuit 111 adjusts the output voltage V further based on the feedback voltage V FB1 and further adjusts the output voltage V OUT . For example, when the feedback voltage V FB1 is lower than the reference voltage V REF1 (alternatively referred to as a second reference voltage), this indicates that the output voltage V OUT may be lower than a first predetermined value (e.g., 3V). Therefore, the power generation circuit 111 steps up the output voltage V OUT . When the feedback voltage V FB1 is higher than the reference voltage V REF1 , this indicates that the output voltage V OUT may be higher than the first predetermined value (e.g., 3V). Therefore, the power generation circuit 111 steps down the output voltage V OUT .

[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 is not limited thereto. In this embodiment, the voltage converter circuit 116 processes the input voltage V INIn addition to receiving the input capacitor C IN It is connected to the voltage converter circuit 116, which receives a feedback voltage V FB1 Based on the input voltage V IN Adjust the converter voltage V T This generates [the specified voltage]. The configuration of the voltage converter circuit 116 is not limited to 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 However, the reference voltage V REF1 When the voltage is higher, the operational amplifier 117 may output a first level of low potential. The voltage converter circuit 116 converts the voltage V based on the output of the operational amplifier 117. T Adjust it (for example, lower the voltage). Feedback voltage V FB1 However, the reference voltage V REF1 When the voltage is lower, the operational amplifier 117 may output a second level of higher potential. The voltage converter circuit 116 outputs a converter voltage V based on the output of the operational amplifier 117. T Adjust it (for example, boost the voltage). The voltage converter circuit 116 outputs a converter voltage V T It outputs the inductor Lx and output capacitor C. OUT By controlling the charging and discharging of the output node ND, O Output voltage V OUT To provide.

[0015] As shown in Figure 1, the inductor Lx is connected to the voltage converter circuit 116 and the output node ND. O It is connected between and . Output capacitor C OUT This is the output node ND O It is connected between the ground terminal GND. In this embodiment, the output node ND O This is the output terminal of the power generation circuit 111. Output node ND O The voltage is the output voltage VOUT It is called that.

[0016] In this invention, the voltage converter circuit 116 provides a feedback voltage V FB1 Based on this, the converter voltage V T This does not limit the methods for adjusting it. In one embodiment, the feedback voltage V FB1 The reference voltage V REF1 When the voltage is higher, the voltage converter circuit 116 converts the converter voltage V T To lower the blood pressure. Feedback voltage V FB1 The reference voltage V REF1 When the voltage is lower, the voltage converter circuit 116 outputs the converter voltage V T Boost the voltage.

[0017] The feedback circuit 113 is connected to the power generation circuit 111, and the output voltage V OUT Based on the feedback voltage V FB1 Generates. In one embodiment, the feedback circuit 113 is a voltage divider circuit (first voltage divider circuit), and the output voltage V OUT A voltage divider is applied to the feedback voltage V. FB1 Generates. In this embodiment, the feedback circuit 113 has resistors R1 and R2. Resistors R1 and R2 are connected to the output node ND. O It is connected in series between and the ground terminal GND.

[0018] The conductor 112 is connected between the power generation circuit 111 and the SOC 120, and the output voltage V OUT This is sent to the power input pin of the SOC120. In this embodiment, the conductor 112 is connected to the output voltage V OUT The load voltage V LOAD In addition, the load voltage V LOAD This power is supplied to the SOC120's power input pin to drive the SOC120. In this embodiment, the load voltage V LOADThis is the voltage that the SOC120 actually accepts, and it also functions as the operating voltage of the SOC120. In some embodiments, the equivalent resistance of the conductor 112 causes a voltage drop, so the load voltage V LOAD The output voltage V OUT It could be even lower.

[0019] The feedback circuit 115 is connected to the wire 112, and the load voltage V LOAD Based on this, the feedback voltage V FB2 Generates. In one embodiment, the feedback circuit 115 is a voltage divider circuit (second voltage divider circuit), and the load voltage V LOAD A voltage divider is applied to the feedback voltage V. FB2 The present invention generates a feedback voltage V FB2 This does not limit the magnitude. Feedback voltage V FB2 The feedback voltage V FB1 It can be higher or lower. In one embodiment, the feedback voltage V FB2 The voltage is 0.4V, and the feedback voltage is V FB1 The voltage is 0.8V.

[0020] In this embodiment, the feedback circuit 115 has resistors R3 and R4. Resistors R3 and R4 are connected in series between the power input pin PIN and the ground terminal GND of the SOC120. 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). Since the feedback circuit 115 is closer to the SOC 120 than the feedback circuit 113, the feedback voltage V generated by the feedback circuit 115 FB2 The load voltage V LOAD It can better reflect the changes.

[0021] The compensation circuit 114 adjusts the feedback voltage V FB2 based on the feedback voltage V FB1 . For example, when the feedback voltage V FB2 is excessively large, this indicates that the output voltage V OUT is excessively large. Therefore, the compensation circuit 114 steps up the feedback voltage V FB1 to cause the power generation circuit 111 to step down the output voltage V OUT . When the feedback voltage V FB2 is excessively small, this indicates that the output voltage V OUT is excessively small. Therefore, the compensation circuit 114 steps down the feedback voltage V FB1 to cause the power generation circuit 111 to step up the output voltage V OUT .

[0022] Due to the influence of the equivalent resistance of the conducting wire 112, when the conducting wire 112 transmits the output voltage V OUT to the power input pin PIN of the SOC 120, the voltage actually received by the power input pin PIN (i.e., the load voltage V LOAD ) may be lower than the output voltage V OUT . However, since the feedback circuit 115 is located closer to the SOC 120 than the feedback circuit 113, the feedback voltage V FB2 generated by the feedback circuit 115 can better reflect changes in the load voltage V LOAD . The compensation circuit 114 appropriately adjusts the feedback voltage V FB2 based on changes in the feedback voltage V FB1 , whereby the power generation circuit 111 adjusts the output voltage V OUT to compensate for the voltage drop caused by the equivalent resistance of the conducting wire 112 in the load voltage V LOAD .

[0023] When the compensation circuit 114 adjusts the feedback voltage V FB1By adjusting this, the voltage drop caused by the conductor 112 can be compensated, reducing the voltage error value caused by poor layout of the printed circuit board (PCB), and improving the power supply quality of the power generation circuit 111. In some embodiments, the load voltage V LOAD 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 must be less than 2% of the core voltage. For example, load voltage V LOAD If the voltage is 0.6V, the ripple voltage must be less than 10mV. However, due to noise interference, SOC120 may receive a ripple voltage exceeding 20mV. In this case, the compensation circuit 114 receives the feedback voltage V FB2 Based on this, the feedback voltage V FB1 Adjust the feedback voltage V FB2 Since this reflects the ripple voltage, the compensation circuit 114 can also compensate for voltage fluctuations caused by the ripple voltage. The compensation circuit 114 controls the load voltage V LOAD This stabilizes the quality, ensuring the performance of the SOC120.

[0025] In other embodiments, the feedback circuit 113 is located close to the power generation circuit 111, so the feedback voltage V generated by the feedback circuit 113 FB1 Furthermore, the output voltage V OUT This allows the change in the feedback voltage V to be reflected. Therefore, the voltage converter circuit 116 can reflect the change in the feedback voltage V. FB1 Based on this, the output voltage V OUT This is then stabilized to a first predetermined value, such as 3V.

[0026] Through two-stage feedback control, the output voltage V OUT The level will stabilize. The two-stage feedback control is performed when the load voltage V LOAD When the feedback voltage V changes, FB1 By adjusting the output voltage V in real time, OUT Adjust the load voltage V LOAD Maintain quality and stabilize the performance of SOC120.

[0027] In some embodiments, the power generation circuit 111 includes a load capacitor C LOAD It further includes: Load capacitor C LOAD This is connected in parallel to the feedback circuit 115 and close to the power input pin PIN of the SOC120. In some embodiments, the compensation circuit 114 is incorporated into the SOC 120. In this case, the SOC120 further has input pins (not shown) and output pins (not shown). The input pins are connected to a feedback voltage V FB2 It is connected to the feedback circuit 115 to receive the feedback voltage V. FB1 It is connected to the feedback circuit 113 to adjust it.

[0028] Figure 2 shows the compensation circuit of the present invention. As shown in Figure 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 has a feedback voltage V FB2 Convert from analog format to digital format to digital signal S D The processing circuit 230 generates the digital signal S. D The difference between the first and second predetermined values ​​is calculated and this difference is provided to the DAC220. The configuration of the processing circuit 230 is not limited in this disclosure. In one embodiment, the processing circuit 230 includes a central processing unit (CPU), a microcontroller (MCU), or a digital signal processor (DSP).

[0029] The DAC220 converts the difference value output by the processing circuit 230 from a digital format to an analog format, and outputs an analog signal S A Generates a resistor R. S It is connected between the DAC220 and the feedback circuit 113, and the analog signal S A We accept it. In one embodiment, the DAC220 is a current digital-to-analog converter (iDAC). By outputting (source) current to the feedback circuit 113 or by extracting (sinking) the current from the feedback circuit 113, the feedback voltage V FB1 The objective is to adjust. For example, when the DAC220 outputs current to the feedback circuit 113, the feedback voltage V FB1 The voltage is boosted. When DAC220 extracts the current from the feedback circuit 113, the feedback voltage V FB1 It lowers the blood pressure.

[0030] Figure 3 is another diagram showing 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 a feedback voltage V FB2 The inverting input terminal of the operational amplifier 310 is connected to node ND1, and the reference voltage V REF2 It accepts (or referred to as the first reference voltage). Resistor 330 is connected between the output terminal of operational amplifier 310 and the feedback circuit 113. In one embodiment, the resistance value of resistor 330 is 0Ω. In another embodiment, resistor 330 can be omitted.

[0031] Resistor 320 is connected between the output terminal of operational amplifier 310 and node ND1. Resistor 340 is connected between node ND1 and the ground terminal GND. In this embodiment, resistors 320 and 340 constitute a voltage divider circuit, and based on the output of the operational amplifier 310, a reference voltage V REF2Generates. In some embodiments, the reference voltage V REF2 The reference voltage V of the voltage converter circuit 116 REF1 Lower.

[0032] In this embodiment, the operational amplifier 310 receives a feedback voltage V FB2 and reference voltage V REF2 Based on the difference between the two values, an output differential voltage VO1 is generated. Feedback voltage V FB2 The reference voltage V REF2 When the value is higher, the output differential voltage VO1 becomes a positive differential voltage. (Feedback voltage V) FB2 The reference voltage V REF2 When the voltage is lower, the output differential voltage VO1 becomes a negative differential voltage. In this embodiment, the operational amplifier 310 receives a feedback voltage V FB2 and reference voltage V REF2 The difference value between and is detected and the feedback voltage V FB1 Adjust.

[0033] For example, feedback voltage V FB2 The reference voltage V REF2 When the value is higher, the output differential voltage VO1 is a positive differential voltage, so the current flowing through resistor 330 and into the feedback circuit 113 increases. Therefore, the feedback voltage V FB1 The voltage increases. On the other hand, the feedback voltage V FB2 The reference voltage V REF2 When it is lower, the output differential voltage VO1 is a negative differential voltage, so the current flowing from the feedback circuit 113 through the resistor 330 increases. Therefore, the feedback voltage V FB1 The blood pressure drops.

[0034] In other embodiments, the operational amplifier 310 is used to output current to the feedback circuit 113, or the current from the feedback circuit 113 is extracted to generate a feedback voltage V FB1 It is also possible to change it. For example, when the operational amplifier 310 outputs current to the feedback circuit 113, the feedback voltage V FB1 The voltage is boosted. When the operational amplifier 310 extracts the current from the feedback circuit 113, the feedback voltage V FB1 It lowers the blood pressure.

[0035] In some embodiments, the operational amplifier 310 is located near the power input pin PIN of the SOC120, and the load voltage V LOAD The system detects changes in the output voltage V and dynamically adjusts the magnitude of the current flowing into the feedback circuit 113, thereby controlling the output voltage V in real time. OUT Adjustments are made to the load voltage V LOAD It compensates for the change in the feedback voltage V. Furthermore, the operational amplifier 310 compensates for the change in the feedback voltage V. FB2 Based on the change in load voltage V LOAD The system determines whether the ripple voltage is excessive, and based on the magnitude of the ripple voltage, controls the magnitude of the current flowing into the feedback circuit 113 to control the output voltage V OUT This adjusts the voltage to compensate for the effects caused by ripple voltage.

[0036] In addition, the operational amplifier 310 has a feedback voltage V FB2 Based on the change in load voltage V LOAD However, it is determined whether or not it is being affected by an excessive voltage drop caused by the current flowing through conductor 112. Load voltage V LOAD When the output voltage V changes significantly, the operational amplifier 310 controls the magnitude of the current flowing into the feedback circuit 113 based on the voltage drop caused by the conductor 112, thereby controlling the output voltage V OUT Adjust the load voltage V generated by the current flowing through the conductor 112. LOAD This compensates for the voltage drop.

[0037] Figure 4 is another diagram showing 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 accepts the feedback voltage V. FB2 The input terminal of inverter 420 is connected to the output terminal of operational amplifier 410.

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

[0039] In this embodiment, the operational amplifier 410 receives a feedback voltage V FB2 and reference voltage V REF2 Based on the difference between the two values, an output differential voltage VO2 is generated. Feedback voltage V FB2 The reference voltage V REF2 When the value is higher, the output differential voltage VO2 becomes a negative differential voltage. The inverter 420 inverts the output differential voltage VO2 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 The voltage increases. Feedback voltage V FB2 The reference voltage V REF2 When the voltage is lower, the output differential voltage VO2 becomes a positive differential voltage. The inverter 420 inverts the output differential voltage VO2 and outputs a negative differential voltage. At this time, some of the current flows from the feedback circuit 113 into the resistor 430. Therefore, the feedback voltage V FB1 The blood pressure drops.

[0040] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as they would be generally understood by an ordinary person skilled in the art to which this invention pertains. Furthermore, it should be understood that these terms, as defined in commonly used dictionaries, should be interpreted in a way that is consistent with the relevant technology 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," "second," etc., are used to distinguish each component, and do not limit the components by these terms. These terms are used simply as symbols to distinguish one component from another, and in the claims, terms such as "first," "second," etc., are merely symbols for identification and are not intended to impose numerical limitations on the subject matter.

[0041] While the present invention has been disclosed in the above-described preferred embodiments, it is not limited thereto. 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, apparatus, and methods described in the embodiments of the present invention can be implemented by hardware, software, or a combination of hardware and software. Therefore, the scope of protection of the present invention shall be determined by the content described in the claims. [Explanation of Symbols]

[0042] 100 Power supply system, 110 Power supply circuit, 111 Generator circuit, 112 Wire, 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~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 signal, 310, 410 operational amplifier, 420 inverter.

Claims

1. A power supply circuit that supplies power to a system-on-a-chip, A power generation circuit that adjusts the input voltage based on the first feedback voltage and generates an output voltage, A first feedback circuit connected to the power generation circuit generates the first feedback voltage based on the output voltage, A wire connects the power generation circuit and the system-on-chip, receives the output voltage, and supplies the output voltage to the system-on-chip as a load voltage. A second feedback circuit connected to the aforementioned wire, which generates a second feedback voltage based on the load voltage, and It has a compensation circuit that adjusts the first feedback voltage based on the second feedback voltage, When the second feedback voltage is higher than the first reference voltage, the compensation circuit increases the first feedback voltage. When the first feedback voltage is higher than the second reference voltage, the power generation 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 generation circuit increases the output voltage. The aforementioned compensation circuit is An operational amplifier having a non-inverting input terminal, an inverting input terminal and an output terminal, wherein the non-inverting input terminal receives the second feedback voltage and the inverting input terminal is connected to a node, A first resistor connected between the output terminal and the node, A second resistor connected between the node and the ground terminal, A third resistor connected between the output terminal and the first feedback circuit, A power supply circuit characterized by having the following features.

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

3. The first feedback circuit is a first voltage divider circuit that divides the output voltage to generate the first feedback voltage. The power supply circuit according to claim 1, characterized in that the second feedback circuit is a second voltage divider circuit, and generates the second feedback voltage by dividing the load voltage.

4. The power supply circuit according to claim 1, characterized in that 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 into the first feedback circuit increases. The power supply circuit according to claim 1, characterized in that when the second feedback voltage is lower than the first reference voltage, the current flowing from the output terminal through the third resistor into the first feedback circuit decreases.

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

7. A power supply circuit that supplies power to a system-on-a-chip, A power generation circuit that adjusts the input voltage based on the first feedback voltage and generates an output voltage, A first feedback circuit connected to the power generation circuit generates the first feedback voltage based on the output voltage, A wire connects the power generation circuit and the system-on-chip, receives the output voltage, and supplies the output voltage to the system-on-chip as a load voltage. A second feedback circuit connected to the aforementioned wire, which generates a second feedback voltage based on the load voltage, and It has a compensation circuit that adjusts the first feedback voltage based on the second feedback voltage, When the second feedback voltage is higher than the first reference voltage, the compensation circuit increases the first feedback voltage. When the first feedback voltage is higher than the second reference voltage, the power generation 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 generation circuit increases the output voltage. The aforementioned compensation circuit is An operational amplifier having a non-inverting input terminal, an inverting input terminal, and a first output terminal, wherein the inverting input terminal receives the second feedback voltage and the non-inverting input terminal is connected to a node, An inverter having an input terminal and a second output terminal, wherein the input terminal is connected to the first output terminal, A first resistor connected between the second output terminal and the node, A second resistor is connected between the node and the ground terminal, A third resistor connected between the second output terminal and the first feedback circuit, A power supply circuit characterized by having the following features.

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