Feedback circuit, voltage regulation circuit, power supply module and vehicle

Abstract

The utility model relates to a feedback circuit, a voltage regulation circuit, a power module and a vehicle, the feedback circuit comprises an operational amplifier, the first input end of the operational amplifier is connected with a preset potential point, the second input end of the operational amplifier is connected with a voltage regulation signal of a load, and the operational amplifier can process the voltage regulation signal according to the preset potential point; and the voltage regulation signal is fed back to the voltage regulation power supply through the output end, so that the voltage regulation power supply regulates the voltage output to the load according to the voltage regulation signal. No matter whether the load has the PWM function or not, the voltage-regulating power supply can regulate the voltage output to the load in real time according to the received feedback signal, so that the problem that the real-time regulation of the output voltage cannot be realized for the load without the PWM function in the related technology is solved.

Description

Technical Field

[0001] This application relates to the field of electronic technologies, and particularly to a feedback circuit, a voltage regulating circuit, a power supply module and a vehicle. Background Art

[0002] With the development of electric vehicles towards multi-functionality and intelligence, more and more electronic components are configured in the vehicle, and more and more power supply circuits are required. The in-vehicle DC-DC voltage regulating power supply module regulates the voltage output to the load. Generally, it detects the fixed voltage division of the output voltage through a feedback circuit, and then compares the fixed voltage division fed back with the reference voltage through a comparator inside the power supply chip to adjust the output voltage.

[0003] As Figure 1 shown, in the related art, a Pulse-Width Modulation (PWM) module can be set on the load, and by modulating the widths of a series of pulses, the required waveform (including shape and amplitude) can be equivalently obtained, that is, by changing the duty cycle, the output voltage can be adjusted. However, for a load without PWM function, real-time adjustment of the output voltage cannot be achieved. Summary of the Utility Model

[0004] Embodiments of this application provide a feedback circuit, a voltage regulating circuit, a power supply module and a vehicle, which can also achieve real-time adjustment of the output voltage for a load without PWM function, so as to at least partially solve the above technical problems.

[0005] To achieve the above object, according to the first aspect of this application, a feedback circuit is provided for feeding back the voltage regulation signal of a load to a voltage regulating power supply; the feedback circuit includes an operational amplifier, the operational amplifier includes a first input terminal, a second input terminal and an output terminal, the first input terminal is connected to a preset potential point, the second input terminal is connected to the voltage regulation signal of the load, and the operational amplifier is configured to process the voltage regulation signal according to the preset potential point and then feed it back to the voltage regulating power supply through the output terminal, so that the voltage regulating power supply adjusts the voltage output to the load according to the voltage regulation signal.

[0006] Optionally, the operational amplifier is further configured to: receive a first pulse-width modulation signal sent by the load through the second input terminal; compare the first pulse-width modulation signal with the preset potential point and output a second pulse-width modulation signal through the output terminal; wherein, the preset potential point is consistent with the high level of the first pulse-width modulation signal.

[0007] Optionally, the operational amplifier is further configured to: receive a clock signal sent by the load through the second input terminal; compare the clock signal with the preset potential point and output a third pulse width modulation signal including a target high level; wherein, the target high level is the preset potential point adjusted according to the requirements of the load.

[0008] Optionally, the operational amplifier is further configured to isolate the load from the voltage regulating power supply.

[0009] Optionally, the feedback circuit further includes a low-pass filter circuit, and the low-pass filter circuit includes: a first resistor, one end of the first resistor is electrically connected to the output terminal of the operational amplifier; a first capacitor, the other end of the first resistor and one end of the first capacitor are connected to a first connection point, and the other end of the first capacitor is connected to a preset low potential point.

[0010] Optionally, the feedback circuit further includes a voltage dividing circuit, and the voltage dividing circuit includes: a second resistor, one end of the second resistor is connected to the first connection point, and the other end is connected to a second connection point; a third resistor, one end of the third resistor is connected to the second connection point, and the other end is connected to the voltage regulating power supply; a fourth resistor, one end of the fourth resistor is connected to the second connection point, and the other end is connected to a preset low potential point.

[0011] Optionally, the voltage dividing circuit further includes: a second capacitor, connected in parallel with the fourth resistor.

[0012] Optionally, the voltage regulating power supply is a DC voltage regulating power supply.

[0013] According to another aspect of the present application, there is also provided a voltage regulating circuit, including: a voltage regulating power supply including a feedback port; a load electrically connected to the voltage regulating power supply to receive the output voltage of the voltage regulating power supply; a feedback circuit electrically connected to the load and the feedback port respectively, the feedback circuit includes an operational amplifier, the operational amplifier includes a first input terminal, a second input terminal and an output terminal, the first input terminal is connected to a preset potential point, the second input terminal is connected to a voltage regulation signal of the load, and the operational amplifier is configured to process the voltage regulation signal according to the preset potential point and then feedback it to the voltage regulating power supply through the output terminal, so that the voltage regulating power supply adjusts the voltage output to the load according to the voltage regulation signal.

[0014] Optionally, the operational amplifier is further configured to: receive a first pulse width modulation signal sent by the load through the second input terminal; compare the first pulse width modulation signal with the preset potential point and output a second pulse width modulation signal through the output terminal; wherein, the preset potential point is consistent with the high level of the first pulse width modulation signal.

[0015] Optionally, the operational amplifier is further configured to: receive a clock signal sent by the load through the second input terminal; compare the clock signal with the preset potential point and output a third pulse width modulation signal including a target high level; wherein, the target high level is a preset potential point adjusted according to the requirements of the load.

[0016] Optionally, the feedback circuit further includes a low-pass filter circuit, and the low-pass filter circuit includes: a first resistor, one end of the first resistor is electrically connected to the output terminal of the operational amplifier; a first capacitor, the other end of the first resistor and one end of the first capacitor are connected to a first connection point, and the other end of the first capacitor is connected to a preset low potential point.

[0017] Optionally, the feedback circuit further includes a voltage dividing circuit, and the voltage dividing circuit includes: a second resistor, one end of the second resistor is connected to the first connection point, and the other end is connected to a second connection point; a third resistor, one end of the third resistor is connected to the second connection point, and the other end is connected to the voltage regulating power supply; a fourth resistor, one end of the fourth resistor is connected to the second connection point, and the other end is connected to a preset low potential point.

[0018] Optionally, the voltage regulating circuit further includes: a current detection circuit, disposed between the voltage regulating power supply and the load, and the current detection circuit is configured to detect the magnitude of the current input from the voltage regulating power supply to the load.

[0019] Optionally, the current detection circuit includes a detection resistor, and is configured to determine the magnitude of the current input from the voltage regulating power supply to the load according to the voltage value across the detection resistor and the resistance value of the detection resistor during current detection.

[0020] According to a third aspect of the present application, there is also provided a power supply module, including a DC power supply and the above-mentioned feedback circuit, or including the above-mentioned voltage regulating circuit.

[0021] According to a fourth aspect of the present application, there is also provided a vehicle, including the power supply module as described above.

[0022] The feedback circuit according to the embodiment of the present application includes an operational amplifier. The first input terminal of the operational amplifier is connected to a preset potential point, and the second input terminal is connected to the voltage regulation signal of the load. After processing the voltage regulation signal according to the preset potential point, the operational amplifier can feed it back to the voltage regulation power supply through the output terminal, so that the voltage regulation power supply adjusts the voltage output to the load according to the voltage regulation signal. In this way, even if the load does not have the PWM function and cannot directly emit a PWM signal but can only send a common clock signal, the operational amplifier can process the received clock signal and adjust it into a pulse signal with a preset high level, that is, an analog PWM signal, as a feedback signal to be sent to the voltage regulation power supply, so that the voltage regulation power supply adjusts the voltage output to the load according to the received feedback signal, thereby solving the problem in the related art that for a load without the PWM function, the real-time adjustment of the output voltage cannot be achieved.

[0023] Other features and advantages of the present application will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

[0025] In order to more completely understand the present application and its beneficial effects, the following description will be made in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0026] Figure 1 is a schematic structural diagram of a voltage regulation circuit provided in the related art;

[0027] Figure 2 is a schematic structural diagram of a feedback circuit provided in an exemplary embodiment of the present application;

[0028] Figure 3 is a schematic structural diagram of another feedback circuit provided in an exemplary embodiment of the present application;

[0029] Figure 4 is a schematic structural diagram of another feedback circuit provided in an exemplary embodiment of the present application;

[0030] Figure 5 is a schematic structural diagram of a voltage regulation circuit provided in an exemplary embodiment of the present application;

[0031] Figure 6 is a schematic structural diagram of a power supply module provided in an exemplary embodiment of the present application.

[0032] Description of reference numerals:

[0033] 10. Power module;

[0034] 100. Feedback circuit; 101. Operational amplifier; 102. Low-pass filter circuit; 103. Voltage divider circuit;

[0035] 200, load;

[0036] 300, voltage regulating power supply; 301, feedback port;

[0037] 400. Current detection circuit;

[0038] A. First connection point; B. Second connection point. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0040] Reference Figure 1 As shown, according to an embodiment of the present application, a feedback circuit 100 is provided for feeding back a voltage regulation signal of a load 200 to a voltage regulating power supply 300 .

[0041] The load 200 involved in the embodiment of the present application can be a chip, a separate electrical device, such as a vehicle-mounted appliance or a household appliance, or a combination of electrical devices. The load 200 may or may not have the corresponding detection function, and the embodiment of the present application does not limit this.

[0042] The voltage regulating power supply 300 involved in the embodiment of the present application may include a DC voltage regulating power supply or an AC voltage regulating power supply. The DC voltage regulating power supply may be implemented by a DC-DC boost circuit or a DC-DC buck circuit. The specific structure may be set according to the application scenario, and the embodiment of the present application does not limit this.

[0043] Specifically, refer to Figure 2As shown, the feedback circuit 100 includes an operational amplifier 101. The operational amplifier 101 includes a first input terminal 1, a second input terminal 2, and an output terminal 3. The first input terminal 1 is connected to a preset potential point, which is equivalent to the reference voltage VREF. The second input terminal 2 is connected to the voltage regulation signal of the load 200. The operational amplifier 101 is configured to process the voltage regulation signal according to the preset potential point and then feedback it to the voltage regulation power supply 300 through the output terminal 3, so that the voltage regulation power supply 300 adjusts the voltage output to the load 200 according to the voltage regulation signal.

[0044] Through the above solution, even if the load 200 does not have the PWM function and cannot directly send out the PWM signal but can only send ordinary clock signals, the operational amplifier 101 can process the received clock signal and adjust it into a pulse signal with a preset high level, that is, an analog PWM signal, which is sent to the voltage regulation power supply 300 as a feedback signal. Thus, the voltage regulation power supply 300 adjusts the voltage output to the load 200 according to the received feedback signal, thereby solving the problem in the related art that for a load without the PWM function, the real-time adjustment of the output voltage cannot be achieved.

[0045] In some embodiments, the operational amplifier 101 is further configured to:

[0046] Receive a first pulse width modulation signal (PWM signal) sent by the load 200 through the second input terminal 2;

[0047] Compare the first pulse width modulation signal with the preset potential point (VREF) and output a second pulse width modulation signal through the output terminal; wherein, the preset potential point is consistent with the high level of the first pulse width modulation signal.

[0048] It can be understood that the reference voltage VREF of the operational amplifier 101 can be connected to an external power supply voltage or to the load. In the embodiments of the present application, when the load 200 has the function of sending the PWM signal, the reference voltage of the operational amplifier 101 can be directly connected to the load 200 so that the potential of the reference voltage is consistent with the high level of the PWM signal input by the load 200 to the operational amplifier 101.

[0049] In some embodiments, when the load 200 needs a higher output voltage, it can send a smaller PWM signal to the operational amplifier 101, so that the feedback voltage received by the feedback port 301 of the voltage regulation power supply 300 becomes smaller. At this time, the voltage regulation power supply 300 will increase the magnitude of the output voltage until the feedback voltage received by the feedback port 301 stabilizes at a preset value. Similarly, when the load 200 needs a higher output voltage, it can send a larger PWM signal to the operational amplifier 101, so that the feedback voltage received by the feedback port 301 of the voltage regulation power supply 300 becomes larger.

[0050] In some embodiments, the operational amplifier 101 is further configured to:

[0051] Receive a clock signal (CLK signal) sent by the load 200 through the second input terminal 2;

[0052] Compare the clock signal with a preset potential point and then output a third pulse width modulation signal including a target high level; wherein, the target high level is a preset potential point adjusted according to the requirements of the load 200.

[0053] In the case where the load 200 does not have the function of sending a PWM signal, the load 200 can send a CLK signal with a fixed pulse width, and the reference voltage of the operational amplifier 101 can set a target high level according to the requirements of the load 200. After comparing the CLK signal with the reference voltage, the operational amplifier 101 outputs a pulse signal with a high level being the preset target high level, which is equivalent to simulating a PWM signal.

[0054] In some embodiments, the operational amplifier 101 is further configured to isolate the load 200 from the voltage regulating power supply 300.

[0055] It can be understood that when the load 200 is an external device, an external port needs to be set on the circuit board. When the load 200 is powered off, that is, not plugged into the external port, the external port on the circuit board is in a bare state. If the feedback port 301 of the voltage regulating power supply 300 is directly bare, there is a risk of electric leakage. Therefore, setting the operational amplifier 101 between the feedback port 301 and the load 200 can play an isolating role and prevent the power supply port on the circuit board from being directly bare.

[0056] In some embodiments, referring to Figure 3 and Figure 4 as shown, the feedback circuit 100 further includes a low-pass filter circuit 102. The low-pass filter circuit 102 includes: a first resistor R1, one end of the first resistor R1 is electrically connected to the output end of the operational amplifier; a first capacitor C1, the other end of the first resistor R1 and one end of the first capacitor C1 are connected to a first connection point A, and the other end of the first capacitor C1 is connected to a preset low potential point. The low-pass filter circuit 102 can convert the PWM signal output by the operational amplifier 101 into a constant voltage value.

[0057] In some embodiments, the feedback circuit 100 further includes a voltage dividing circuit. The voltage dividing circuit 103 includes: a second resistor R2, one end of the second resistor R2 is connected to the first connection point A, and the other end is connected to a second connection point B; a third resistor R3, one end of the third resistor R3 is connected to the second connection point B, and the other end is connected to the voltage regulating power supply 300; a fourth resistor R4, one end of the fourth resistor R4 is connected to the second connection point B, and the other end is connected to a preset low potential point.

[0058] Referring toFigure 4 As shown, the voltage regulating power supply 300 in this embodiment is demonstrated by taking an SOT23-6 chip externally connected to a buck circuit as an example. Among them, the SOT23-6 chip includes 6 ports, namely: IN, used to connect to the external power supply VDD_1; EN, used to connect to the enable signal, and in some cases, EN can be connected to the IN port; GND, used to connect to a preset low potential, generally grounded; LX, used to connect to the load and output voltage to the load; BS, used to connect to a bootstrap capacitor, such as capacitor C7; FB, equivalent to the feedback port 301, used to connect to a voltage dividing circuit to obtain the feedback voltage.

[0059] When the load 200 has PWM function and a higher output voltage is required, a smaller PWM signal can be sent to the operational amplifier 101. The operational amplifier 101 outputs the corresponding PWM signal to the low-pass filter circuit to convert the PWM signal into a constant voltage signal. At this time, the voltages at both ends of the second resistor R2 do not match, and the voltage at point A, V A is controlled by the magnitude of the PWM signal, and the voltage at point B, V B is the fixed voltage division value of the third resistor R3 and the fourth resistor R4. The feedback voltage V FB at the FB port = V A + V B . When V A decreases, V FB also decreases. There is a comparator inside the voltage regulating power supply 300 to compare the magnitude of V FB with a preset reference voltage. It is found that V FB has decreased, and the voltage regulating power supply 300 will increase the output voltage VDD_2 and deliver it to the load 200 until the magnitude of V FB is equal to the preset reference voltage and remains stable, then the output voltage VDD_2 will no longer be adjusted. Similarly, when the load 200 requires a lower output voltage, a larger PWM signal can be sent to the operational amplifier 101.

[0060] When the load 200 does not have the PWM function and a relatively low output voltage is required, a conventional CLK signal can be sent to the operational amplifier 101. The fourth port of the operational amplifier 101 is grounded, the fifth port is connected to the external power supply voltage VDD_IO, and the first input terminal 1 is connected to the reference voltage VREF, where the reference voltage VREF can be adjusted according to the external power supply voltage VDD_IO. When the operational amplifier 101 receives the CLK signal sent by the load 200, at the same time, the external controller can adjust the magnitude of VDD_IO according to the requirements of the load 200. When the load 200 requires a lower output voltage, VREF of the operational amplifier 101 is increased through VDD_IO. At this time, the operational amplifier 101 will output an analog PWM pulse signal consistent with the high level of VREF. After passing through the low-pass filter circuit 102, the PWM signal is converted into a constant voltage signal. At this time, V A increases, and V FB also increases. There is a comparator inside the voltage regulating power supply 300 to compare the magnitude of V FB with the preset reference voltage. It is found that V FB has increased, and the voltage regulating power supply 300 will reduce the output voltage VDD_2 and supply it to the load 200 until the magnitude of V FB is equal to the preset reference voltage and remains stable, then the output voltage VDD_2 will no longer be adjusted. Similarly, when the load 200 requires a higher output voltage, VREF of the operational amplifier 101 can be lowered through VDD_IO.

[0061] The resistors R6, R7, and R8 can be used as current-limiting resistors to prevent the on-path current from being too large.

[0062] In some embodiments, the voltage dividing circuit 103 further includes: a second capacitor C2, which is connected in parallel with the fourth resistor R4. The second capacitor C2 can improve the response speed of the voltage dividing circuit 103 and be more sensitive to changes in the magnitude of the output voltage.

[0063] Through the feedback circuit described in the above embodiments, it can be realized that regardless of whether the load has the PWM function, the voltage regulating power supply can adjust the voltage output to the load in real time according to the received feedback signal, thereby solving the problem in the related art that for a load without the PWM function, the real-time adjustment of the output voltage cannot be achieved.

[0064] Referring to Figure 4 and Figure 5 as shown, according to another embodiment of the present application, a voltage regulating circuit is further provided, including: a voltage regulating power supply 300, a load 200, and a feedback circuit 100. Among them, the structure and function of the feedback circuit 100 are as described in any of the above embodiments, and the content that has been described will not be repeated here.

[0065] Specifically, the voltage regulating power supply 300 includes a feedback port 301. The load 200 is electrically connected to the voltage regulating power supply 300 to receive the output voltage of the voltage regulating power supply 300. The feedback circuit 100 is electrically connected to the load 200 and the feedback port 301 respectively.

[0066] In some embodiments, the voltage regulating circuit further includes: a current detection circuit 400, disposed between the voltage regulating power supply 300 and the load 200. The current detection circuit 400 is configured to detect the magnitude of the current input from the voltage regulating power supply to the load.

[0067] Referring to Figure 4 and Figure 5 As shown, the current detection circuit 400 can be implemented by a resistor R9. When the load 200 itself does not have the function of detecting voltage and current, by detecting the voltages VDD_IN and VDD_IP across the external resistor R9, the input voltage of the load 200 can be obtained as VDD_IP, and the current is the difference between VDD_IN and VDD_IP divided by the resistance value of the resistor R9. Furthermore, the input voltage and power of the load 200 can be monitored in real time, so as to send a voltage regulation signal in time when the input voltage does not meet the requirements of the load 200.

[0068] Referring to Figure 6 As shown, according to another embodiment of the present application, a power supply module 10 is further provided, including the voltage regulating power supply 300 and the feedback circuit 100 described in any of the above embodiments, which can implement all the functions of the above feedback circuit. The content that has been described will not be repeated here.

[0069] According to another embodiment of the present application, a power supply module is further provided, including the voltage regulating circuit described in any of the above embodiments, which can implement all the functions of the above voltage regulating circuit. The content that has been described will not be repeated here.

[0070] According to another embodiment of the present application, a vehicle is further provided, including the power supply module described above, which can implement all the functions of the above power supply module. The content that has been described will not be repeated here. The vehicle can be a fuel vehicle, a plug-in hybrid vehicle or a new energy vehicle, etc. The present application does not make specific limitations on this.

[0071] Through the vehicle provided by the embodiments of the present application, it can be realized that regardless of whether the load 200 has the PWM function, the voltage regulating power supply can adjust the voltage output to the load in real time according to the received feedback signal, thereby solving the problem in the related art that for a load without the PWM function, the real-time adjustment of the output voltage cannot be achieved.

[0072] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0073] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0074] The embodiments, implementation manners and related technical features of the present application can be combined and replaced with each other without conflict.

[0075] The above are only the preferred embodiments of the present application and do not impose any formal limitations on the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A feedback circuit for feeding back a voltage regulation signal of a load to a voltage regulating power supply; characterized in that: The feedback circuit includes an operational amplifier, which includes a first input terminal, a second input terminal and an output terminal. The first input terminal is connected to a preset potential point, and the second input terminal is connected to a voltage regulation signal of the load. The operational amplifier is configured to process the voltage regulation signal according to the preset potential point and then feed back the voltage regulation signal to the voltage regulating power supply through the output terminal, so that the voltage regulating power supply adjusts the voltage output to the load according to the voltage regulation signal.

2. The feedback circuit according to claim 1, characterized in that: The operational amplifier is also configured as: receiving a first pulse width modulation signal sent by the load through the second input terminal; After comparing the first pulse width modulation signal with the preset potential point, a second pulse width modulation signal is output through the output terminal; wherein the preset potential point is consistent with the high level of the first pulse width modulation signal.

3. The feedback circuit according to claim 1, characterized in that: The operational amplifier is also configured as: receiving a clock signal sent by the load through the second input terminal; After comparing the clock signal with the preset potential point, a third pulse width modulation signal including a target high level is output; wherein the target high level is the preset potential point adjusted according to the demand of the load.

4. The feedback circuit according to claim 1, characterized in that: The operational amplifier is further configured to isolate the load from the regulated power supply.

5. The feedback circuit according to any one of claims 2 to 4, characterized in that: The feedback circuit further includes a low-pass filter circuit, and the low-pass filter circuit includes: a first resistor, one end of which is electrically connected to the output end of the operational amplifier; A first capacitor, the other end of the first resistor and one end of the first capacitor are connected to a first connection point, and the other end of the first capacitor is connected to a preset low potential point.

6. The feedback circuit according to claim 5, characterized in that: The feedback circuit further includes a voltage divider circuit, and the voltage divider circuit includes: a second resistor, one end of the second resistor being connected to the first connection point, and the other end of the second resistor being connected to the second connection point; a third resistor, one end of the third resistor being connected to the second connection point, and the other end of the third resistor being connected to the voltage regulating power supply; A fourth resistor, one end of the fourth resistor is connected to the second connection point, and the other end of the fourth resistor is connected to a preset low potential point.

7. The feedback circuit according to claim 6, characterized in that: The voltage divider circuit further includes: The second capacitor is connected in parallel with the fourth resistor.

8. The feedback circuit according to claim 1, characterized in that: The voltage-regulated power supply is a DC voltage-regulated power supply.

9. A voltage regulating circuit, characterized in that: include: A voltage-regulated power supply, the voltage-regulated power supply comprising a feedback port; A load, electrically connected to the voltage-regulated power supply to receive an output voltage of the voltage-regulated power supply; A feedback circuit is electrically connected to the load and the feedback port, respectively. The feedback circuit includes an operational amplifier. The operational amplifier includes a first input terminal, a second input terminal and an output terminal. The first input terminal is connected to a preset potential point, and the second input terminal is connected to a voltage regulation signal of the load. The operational amplifier is configured to process the voltage regulation signal according to the preset potential point and then feed back the voltage regulation signal to the voltage regulation power supply through the output terminal, so that the voltage regulation power supply adjusts the voltage output to the load according to the voltage regulation signal.

10. The voltage regulating circuit according to claim 9, characterized in that: The operational amplifier is also configured as: receiving a first pulse width modulation signal sent by the load through the second input terminal; After comparing the first pulse width modulation signal with the preset potential point, a second pulse width modulation signal is output through the output terminal; wherein the preset potential point is consistent with the high level of the first pulse width modulation signal.

11. The voltage regulating circuit according to claim 9, characterized in that: The operational amplifier is also configured as: receiving a clock signal sent by the load through the second input terminal; After comparing the clock signal with the preset potential point, a third pulse width modulation signal including a target high level is output; wherein the target high level is the preset potential point adjusted according to the demand of the load.

12. The voltage regulating circuit according to claim 10 or 11, characterized in that: The feedback circuit further includes a low-pass filter circuit, and the low-pass filter circuit includes: a first resistor, one end of which is electrically connected to the output end of the operational amplifier; A first capacitor, the other end of the first resistor and one end of the first capacitor are connected to a first connection point, and the other end of the first capacitor is connected to a preset low potential point.

13. The voltage regulating circuit according to claim 12, characterized in that: The feedback circuit further includes a voltage divider circuit, and the voltage divider circuit includes: a second resistor, one end of the second resistor being connected to the first connection point, and the other end of the second resistor being connected to the second connection point; a third resistor, one end of the third resistor being connected to the second connection point, and the other end of the third resistor being connected to the voltage regulating power supply; A fourth resistor, one end of the fourth resistor is connected to the second connection point, and the other end of the fourth resistor is connected to a preset low potential point.

14. The voltage regulating circuit according to claim 9, characterized in that: The voltage regulating circuit also includes: The current detection circuit is arranged between the voltage-regulated power supply and the load, and the current detection circuit is configured to detect the magnitude of the current input from the voltage-regulated power supply to the load.

15. The voltage regulating circuit according to claim 14, characterized in that: The current detection circuit includes a detection resistor, and is configured to determine the magnitude of the current input to the load from the voltage-regulated power supply according to the voltage value across the detection resistor and the resistance value of the detection resistor during the current detection process.

16. A power module, characterized in that: It comprises a voltage-regulated power supply and a feedback circuit as claimed in any one of claims 1 to 8.

17. A power module, characterized in that: The voltage regulating circuit according to any one of claims 9 to 15.

18. A vehicle, characterized in that: Comprising the power module according to claim 16 or 17.

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