Voltage compensation circuits and electronic equipment

Abstract

This application provides a voltage compensation circuit and electronic device, relating to the field of electronic power. The voltage compensation circuit includes a sampling circuit, a voltage processing circuit, a first voltage feedback circuit, and a driving circuit. The sampling circuit acquires a sampled electrical signal output from the output port; the voltage processing circuit is connected to the sampling circuit and differentially amplifies the sampled electrical signal to obtain a target electrical signal; the first voltage feedback circuit is connected to the voltage processing circuit and outputs a driving signal based on the target electrical signal; the driving circuit is connected to the first voltage feedback circuit, is mounted on a bus, connects the input port and the output port, and controls the sampled electrical signal to remain within a preset voltage range based on the driving signal. The embodiments of this application aim to reduce the cost and debugging workload of power supply equipment and improve the dynamic response characteristics of the power supply equipment.

Description

Technical Field

[0001] This application relates to the field of electronic power, and in particular to a voltage compensation circuit and electronic device. Background Technology

[0002] Existing power supplies typically include a SENSE function. Power supplies with SENSE feedback measure the port voltage of the remote device interface via SENSE+ / - feedback, sending the measured value to the ADC chip for conversion and judgment. When the software compares the measured value with the expected value, the main control chip adjusts the output value of the DAC chip to the driver circuit, thereby providing a higher voltage to the device and compensating for line loss voltage drop. However, this method requires the use of an ADC chip, a DAC chip, and a main control chip for dynamic compensation of line loss voltage drop, resulting in high hardware costs, extensive software debugging, and poor dynamic response characteristics. Summary of the Invention

[0003] The main objective of this application is to provide a voltage compensation circuit and electronic device, which aims to reduce the cost and debugging workload of power supply equipment and improve the dynamic response characteristics of power supply equipment.

[0004] In a first aspect, this application provides a voltage compensation circuit for compensating the voltage output by a power module. The power module includes an input port and an output port connected via a bus. The voltage compensation circuit includes a sampling circuit, a voltage processing circuit, a first voltage feedback circuit, and a driving circuit. The sampling circuit acquires a sampled electrical signal output from the output port. The voltage processing circuit is connected to the sampling circuit and differentially amplifies the sampled electrical signal to obtain a target electrical signal. The first voltage feedback circuit is connected to the voltage processing circuit and outputs a driving signal based on the target electrical signal. The driving circuit is connected to the first voltage feedback circuit and is disposed on the bus, connecting the input port and the output port, and also controlling the sampled electrical signal to be within a preset voltage range based on the driving signal.

[0005] Secondly, this application also provides an electronic device, which includes a power module and a voltage compensation circuit as described above, the voltage compensation circuit being used to compensate the voltage output by the power module.

[0006] This application provides a voltage compensation circuit and an electronic device. The voltage compensation circuit is used to compensate the voltage output by a power module. The power module includes an input port and an output port, which are connected via a bus. The voltage compensation circuit includes a sampling circuit, a voltage processing circuit, a first voltage feedback circuit, and a driving circuit. The sampling circuit acquires a sampled electrical signal output at the output port. The voltage processing circuit is connected to the sampling circuit and differentially amplifies the sampled electrical signal to obtain a target electrical signal. The first voltage feedback circuit is connected to the voltage processing circuit and outputs a driving signal based on the target electrical signal. The driving circuit is connected to the first voltage feedback circuit and is disposed on the bus, connecting the input port and the output port. It also controls the sampled electrical signal to be within a preset voltage range based on the driving signal. This voltage compensation circuit can compensate the voltage output by the power module without using a chip, thereby reducing the cost and debugging workload of the power supply equipment and improving its dynamic response characteristics. Attached Figure Description

[0007] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 A schematic block diagram of a voltage compensation circuit provided in an embodiment of this application;

[0009] Figure 2 A schematic block diagram of another voltage compensation circuit provided in an embodiment of this application;

[0010] Figure 3 A schematic circuit diagram of a voltage compensation circuit provided for an embodiment of this application;

[0011] Figure 4 A schematic block diagram of another voltage compensation circuit provided in an embodiment of this application;

[0012] Figure 5 A schematic circuit diagram of another voltage compensation circuit provided in an embodiment of this application;

[0013] Figure 6 A schematic block diagram of an electronic device provided in an embodiment of this application;

[0014] Figure label:

[0015] 1000. Electronic devices;

[0016] 100. Voltage compensation circuit; 10. Sampling circuit; 20. Voltage processing circuit; 30. First voltage feedback circuit; 40. Drive circuit; 50. Second voltage feedback circuit; 60. Current detection circuit; 200. Power supply module. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Power supplies with SENSE functionality, in addition to a set of positive and negative power interfaces, also have a set of SENSE+ and SENSE- remote sampling ports. These ports collect precise voltage values ​​from the device and input them into the power control unit, thereby adjusting the voltage output and compensating for voltage line losses caused by fluctuations in the overall loop current due to conductor resistance. This ensures precise remote voltage output during device operation. Without SENSE functionality, when used to power remote devices, the voltage of the powered device will be too low, potentially causing it to malfunction and affecting the overall test results.

[0019] Existing power supply devices with SENSE feedback use a precision ADC chip to acquire the remote voltage, calculate and compare it with the expected value through software to determine the difference, and then control and adjust the output voltage to increase, thereby compensating for line loss voltage drop. However, using an ADC chip, DAC chip, and main control chip for dynamic compensation of line loss voltage drop has disadvantages such as high hardware cost, large software debugging workload, and poor dynamic response characteristics.

[0020] To address the aforementioned issues, this application provides a voltage compensation circuit and electronic device. The voltage compensation circuit is used to compensate the voltage output by the power module, aiming to achieve voltage compensation of the power module output without the need for a chip, thereby reducing the cost and debugging workload of the power supply equipment and improving the dynamic response characteristics of the power supply equipment.

[0021] Please refer to Figure 1 , Figure 1 This is a schematic block diagram of a voltage compensation circuit 100 provided in an embodiment of this application. The voltage compensation circuit 100 is used to compensate the voltage output by a power supply module 200. The power supply module 200 includes an input port and an output port, which are connected via a bus.

[0022] like Figure 1 As shown, the voltage compensation circuit 100 includes a sampling circuit 10, a voltage processing circuit 20, a first voltage feedback circuit 30, and a driving circuit 40. The sampling circuit 10 is used to acquire the sampled electrical signal output from the output port; the voltage processing circuit 20 is connected to the sampling circuit 10 and is used to differentially amplify the sampled electrical signal to obtain a target electrical signal, wherein the target electrical signal can be the voltage signal after differential amplification of the sampled electrical signal.

[0023] The first voltage feedback circuit 30 is connected to the voltage processing circuit 20. The first voltage feedback circuit 30 is used to output a drive signal according to the target electrical signal. The drive circuit 40 is connected to the first voltage feedback circuit 30. The drive circuit 40 is located on the bus and is used to connect the input port and the output port. It is also used to control the sampled electrical signal to be within a preset voltage range according to the drive signal. The input port can be powered by a third preset power supply V3 to input voltage to the bus and the output port.

[0024] The driving signal is used to control the activation level of the driving circuit 40, thereby controlling the voltage input at the input port to be output to the output port, and ensuring that the sampled electrical signal output from the output port is within a preset voltage range. The preset voltage range can be any voltage range suitable for the load operation, and is not specifically limited here.

[0025] The voltage compensation circuit 100 of this application first differentially amplifies the sampled electrical signal through the voltage processing circuit 20 to obtain the target electrical signal. Then, the first voltage feedback circuit 30 outputs a corresponding drive signal based on the target electrical signal to drive the opening degree of the drive circuit 40, thereby controlling the voltage input at the input port to be output to the output port, and ensuring that the sampled electrical signal output from the output port is within a preset voltage range. This allows for voltage compensation of the output voltage of the power module 200 without the need for a chip, thereby reducing the cost and debugging workload of the power supply equipment and improving its dynamic response characteristics.

[0026] For example, since the voltage input at the input port is output to the output port through the bus to power the load, current fluctuations during transmission will cause dynamic voltage drop losses due to the DC resistance of the line. In this case, the voltage processing circuit 20 first differentially amplifies the sampled electrical signal at the output port to obtain the target electrical signal. Then, the first voltage feedback circuit 30 outputs a corresponding drive signal based on the target electrical signal to drive the opening degree of the drive circuit 40. Since there is generally a line loss voltage drop, voltage compensation is needed for the output voltage at the output port. Therefore, the opening degree of the drive circuit 40 is increased to control the voltage input at the input port to output more voltage to the output port, ensuring that the sampled electrical signal output from the output port is within a preset voltage range, thereby achieving the effect of voltage compensation.

[0027] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic block diagram of a voltage compensation circuit 100 provided in an embodiment of this application. Figure 3 This is a circuit diagram of a voltage compensation circuit 100 provided in an embodiment of this application.

[0028] In some embodiments, the voltage compensation circuit 100 further includes a second voltage feedback circuit 50, which is connected to the drive circuit 40 and the first voltage feedback circuit 30. The second voltage feedback circuit 50 is used to acquire the voltage value output by the drive circuit 40 and feed back the high-frequency change of the voltage value to the first voltage feedback circuit 30 to change the target electrical signal.

[0029] Specifically, the second voltage feedback circuit 50 can act as a pass-through AC and block-through DC. Therefore, after the target electrical signal output by the voltage processing circuit 20 is transmitted to the first voltage feedback circuit 30, the high-frequency change of the voltage value can be fed back to the first voltage feedback circuit 30 to change the target electrical signal and improve the transient response performance.

[0030] In some embodiments, the second voltage feedback circuit 50 includes a first capacitor C1, a first resistor R1, and a second resistor R2. The first terminal of the first capacitor C1 is connected to the output terminal of the drive circuit 40, and the second terminal of the first capacitor C1 is connected to the first voltage feedback circuit 30. The first terminal of the first resistor R1 is connected to the voltage processing circuit 20, and the second terminal of the first resistor R1 is connected to the second terminal of the first capacitor C1. The first terminal of the second resistor R2 is connected to the second terminal of the first resistor R1, and the second terminal of the second resistor R2 is grounded.

[0031] The first capacitor C1 is used to feed back the high-frequency changes in the voltage output to the first voltage feedback circuit 30. The first capacitor C1 has the characteristic of passing AC and blocking DC. For transient changes in the load, which may cause instantaneous fluctuations in the output voltage of the drive circuit 40, the first capacitor C1 can improve the transient response performance. The first resistor R1 and the second resistor R2 perform proportional calculations on the target electrical signal output by the voltage processing circuit 20 and send it to the first voltage feedback circuit 30.

[0032] Specifically, the proportional calculation of the target electrical signal output by the first resistor R1 and the second resistor R2 with respect to the voltage processing circuit 20 can be expressed by the following formula:

[0033]

[0034] Among them, V U1 The voltage value V input to the first voltage feedback circuit 30 U2 The voltage value corresponding to the target electrical signal output by the voltage processing circuit 20.

[0035] In some embodiments, the driving circuit 40 includes a first switch Q1, a sixth resistor R6, and a seventh resistor R7. The control terminal of the first switch Q1 is connected to the first voltage feedback circuit 30, and the first terminal of the first switch Q1 is connected to the input port. The first switch Q1 is used to control the on-state of the first switch Q1 according to the driving signal, so as to control the sampling electrical signal output from the output port to be within a preset voltage range. The first terminal of the sixth resistor R6 is connected to the second terminal of the first switch Q1. The first terminal of the seventh resistor R7 is connected to the second terminal of the sixth resistor R6, and the second terminal of the seventh resistor R7 is connected to the output port.

[0036] In this circuit, the first switching transistor Q1 can be a transistor or MOSFET, or other device with switching characteristics. The sixth resistor R6 is a current sampling resistor, which can be used to determine whether the current output by the drive circuit 40 is overcurrent by detecting the voltage difference across the sixth resistor R6. The seventh resistor R7 is the equivalent DC resistance of the conductor, used to represent the dynamic voltage drop loss caused by current fluctuations during voltage transmission due to the DC resistance of the line.

[0037] For example, the first switching transistor Q1 is an NMOS transistor. The gate of the first switching transistor Q1 is connected to the first voltage feedback circuit 30, the source of the first switching transistor Q1 is connected to the output port, and the drain of the first switching transistor Q1 is connected to the input port. The first switching transistor Q1 can be controlled to a certain degree of activation according to the drive signal output by the first voltage feedback circuit 30, thereby ensuring that the sampling electrical signal output from the output port is within a preset voltage range.

[0038] In some embodiments, the first voltage feedback circuit 30 includes a first comparator U1, the non-inverting input terminal of the first comparator U1 is connected to a first preset power supply, the inverting input terminal of the first comparator U1 is connected to a second voltage feedback circuit 50 and a voltage processing circuit 20, and the output terminal of the first comparator U1 is connected to a driving circuit 40. The first comparator U1 is used to output a driving signal according to the changed target electrical signal.

[0039] The first comparator U1 can be a voltage comparator, which is an electronic component that compares the voltages at two input terminals and outputs different voltage results at the output terminal. The first preset power supply is used to provide a first reference electrical signal to determine the voltage compensation value so that the sampled electrical signal output from the output port is within the preset voltage range. The voltage value of the first preset power supply can be any value and is not specifically limited here.

[0040] Specifically, the first voltage feedback circuit 30 is used to output a drive signal based on the magnitude relationship between the changed target electrical signal and the first reference electrical signal. The first comparator U1 is used to output a first drive signal to drive the first switch Q1 to turn on when the first reference electrical signal is greater than the changed target electrical signal, and is also used to output a second drive level signal to drive the first switch Q1 to turn off when the first reference electrical signal is not greater than the changed target electrical signal.

[0041] The first driving level signal can be a high level signal, and the second driving level signal can be a low level signal.

[0042] It should be noted that when the first reference electrical signal is greater than the changed target electrical signal, since the first reference electrical signal is fixed, the magnitude of the target electrical signal can be changed according to the sampled voltage value. Generally speaking, the larger the voltage corresponding to the driving signal, the greater the opening degree of the driving circuit 40, the greater the voltage compensation degree, and the more voltage is output from the control input port to the output port, so that the sampled electrical signal output from the output port is within the preset voltage range, thereby achieving the effect of voltage compensation and stabilizing the sampled electrical signal output from the output port.

[0043] For example, if the voltage value of the first reference electrical signal is 5V and the changed target electrical signal is 2V, then the first comparator U1 outputs a first drive signal and the voltage value of the first drive signal is the voltage difference between the voltage value of the first reference electrical signal and the changed target electrical signal, which is 3V. At this time, the first switch Q1 is turned on to a greater extent, resulting in more voltage compensation. This controls the voltage input at the input port to output more voltage to the output port, and makes the sampled electrical signal output by the output port within the preset voltage range, thereby achieving the effect of voltage compensation and stabilizing the output of the sampled electrical signal at the output port.

[0044] In some embodiments, the first voltage feedback circuit 30 further includes a third resistor R3, a fourth resistor R4, and a fifth resistor R5.

[0045] Specifically, the first end of the third resistor R3 is connected to the non-inverting input of the first comparator U1, and the second end of the third resistor R3 is connected to the first preset power supply. The third resistor R3 is used to limit the current of the voltage signal output by the first preset power supply. The first end of the fourth resistor R4 is connected to the inverting input of the first comparator U1, and the second end of the fourth resistor R4 is connected to the second voltage feedback circuit 50 and the voltage processing circuit 20. The fourth resistor R4 is used to limit the current of the target electrical signal. The first end of the fifth resistor R5 is connected to the output of the first comparator U1, and the second end of the fifth resistor R5 is connected to the driving circuit 40. The fifth resistor R5 is used to limit the current of the driving signal.

[0046] In some embodiments, the sampling circuit 10 includes an eighth resistor R8, the first end of which is connected to the output port and the second end of which is grounded.

[0047] Among them, the eighth resistor R8 can be the load resistor at the device end, and the sampling circuit 10 can obtain the corresponding sampling electrical signal by detecting the voltage difference of the eighth resistor R8.

[0048] In some embodiments, the voltage processing circuit 20 includes a first amplifier U2, the non-inverting input terminal and the inverting input terminal of the first amplifier U2 are connected to the sampling circuit 10, and the first amplifier U2 is used to differentially amplify the sampled electrical signal to obtain the target electrical signal.

[0049] The first amplifier U2 is used to acquire the sampled electrical signal of the eighth resistor R8 and amplify the sampled electrical signal to generate the target electrical signal. The voltage processing circuit 20 can perform differential sampling amplification processing on the voltage across the load of the electrical equipment with a scaling factor of 1, thereby obtaining the target electrical signal. Performing differential sampling amplification processing on the voltage across the load of the electrical equipment with a scaling factor of 1 can provide impedance isolation, and differential sampling of the voltage across the eighth resistor R8 can most accurately reflect the load condition and improve accuracy.

[0050] Specifically, the voltage processing circuit 20 also includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13. The first end of the ninth resistor R9 is grounded, and the second end of the ninth resistor R9 is connected to the non-inverting input terminal of the first amplifier U2. The first end of the tenth resistor R10 is connected to the first end of the eighth resistor R8, and the second end of the tenth resistor R10 is connected to the second end of the ninth resistor R9. The ninth resistor R9 and the tenth resistor R10 serve as a voltage divider.

[0051] The first end of the eleventh resistor R11 is connected to the second end of the eighth resistor R8, and the second end of the eleventh resistor R11 is connected to the inverting input of the first amplifier U2. The eleventh resistor R11 serves as a current limiter. The first end of the twelfth resistor R12 is connected to the first end of the eleventh resistor R11, and the twelfth resistor R12 is grounded. The first end of the thirteenth resistor R13 is connected to the inverting input of the first amplifier U2, and the thirteenth resistor R13 is connected to the output of the first amplifier U2. The thirteenth resistor R13 serves as a low-pass filter.

[0052] Specifically, after connecting the electrical equipment and wiring, the expected output voltage value needs to be set, which can be done through the first preset power supply V1. After acquiring the sampled electrical signal and setting the current limiting parameters, the first amplifier U2 will amplify the output with open-loop gain. The voltage at the output terminal will approach the supply voltage VCC of the first amplifier U2. After the difference VGS between the gate voltage and the source voltage of the first switching transistor Q1 is greater than VGS(th), the output port VOUT will obtain a voltage and momentarily approach the input port VIN. The voltage value of the output port VOUT will act on the eighth resistor R8. Subsequently, the voltage processing circuit 20 samples the voltage across the eighth resistor R8 and sends it to the second voltage feedback circuit 50. After proportional calculation, it is sent to the negative input terminal of the first comparator U1 and compared with the reference voltage value V1 of the positive input terminal. Based on the characteristic of the op-amp having a very large open-loop gain, the positive input value and the negative input value of the op-amp will approach dynamic equilibrium at this time. This dynamic working process is based on the negative feedback amplification principle. Thus, voltage compensation of the output voltage of the power module 200 can be achieved without using a chip, thereby reducing the cost and debugging workload of the power supply equipment and improving the dynamic response characteristics of the power supply equipment.

[0053] Specifically, the relationships between the parameters of the voltage compensation circuit 100 can be made as follows:

[0054]

[0055] Among them, V OUT V1 is the voltage value corresponding to the sampled electrical signal output from the output port, and V2 is the voltage value corresponding to the first preset power supply.

[0056] This allows the drive signal output by the first feedback circuit to control the opening degree of the first switch Q1, and thus voltage compensation can be performed through the first switch Q1, so that the sampling electrical signal output from the output port is within the preset voltage range.

[0057] like Figure 4As shown, in some embodiments, the voltage compensation circuit 100 further includes a current detection circuit 60, which is connected to the second terminal of the first switching transistor Q1 and the control terminal of the first switching transistor Q1. The current detection circuit 60 is used to acquire the sampling electrical signal of the eighth resistor R8 and generate a voltage feedback signal based on the sampling electrical signal, so as to change the driving signal according to the voltage feedback signal.

[0058] The current detection circuit 60 can determine whether the bus current is overcurrent by detecting the voltage of the current sampling resistor, thereby outputting a voltage feedback signal to change the drive signal and control the opening degree of the first switch Q1 to achieve constant current control of the bus.

[0059] like Figure 5 As shown, in some embodiments, the current detection circuit 60 includes a second amplifier U3, a second comparator U4, and a first diode D1. The non-inverting input terminal of the second amplifier U3 is connected to the sixth resistor R6, and the inverting input terminal of the second amplifier U3 is also connected to the sixth resistor R6. The second amplifier U3 is used to differentially amplify the sampled electrical signal from the sixth resistor R6. The non-inverting input terminal of the second comparator U4 is connected to a second preset power supply, and the inverting input terminal of the second comparator U4 is connected to the output terminal of the second amplifier U3. The anode of the first diode D1 is connected to the control terminal of the first switching transistor Q1, and the cathode of the first diode D1 is connected to the output terminal of the second comparator U4. The first diode D1 is used to pull down the drive signal when the second comparator U4 outputs a low-level signal.

[0060] The second comparator U4 can be a voltage comparator, which is an electronic component that compares the voltages at two input terminals and outputs different voltage results at the output terminal. The second preset power supply is used to provide a second reference electrical signal to determine the overcurrent reference value of the bus current. The voltage value of the second preset power supply can be any value, and no specific limitation is made here.

[0061] Specifically, the current detection circuit 60 is used to output a voltage feedback signal based on the relationship between the sampled electrical signal of the sixth resistor R6 after differential amplification and the second reference electrical signal. The second comparator U4 is used to pull down the drive signal when the second comparator U4 outputs a low-level signal, so that the opening degree of the first switch Q1 will decrease and the output voltage will decrease, thereby realizing constant current control of the bus.

[0062] The second comparator U4 is set with a voltage by the second preset power supply V2. The sixth resistor R6 connected in series with the bus is sampled differentially and amplified. The amplified voltage is then compared with the second reference electrical signal and output. The output then controls the gate voltage of the first switch Q1 through the first diode D1. When the gate voltage is pulled low, the opening degree of the first switch Q1 will decrease, and the output voltage will decrease, thereby realizing constant current control of the bus.

[0063] Specifically, the current detection circuit 60 also includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17. The first terminal of the fourteenth resistor R14 is grounded, and the second terminal of the fourteenth resistor R14 is connected to the non-inverting input terminal of the second amplifier U3. The first terminal of the fifteenth resistor R15 is connected to the first terminal of the sixth resistor R6, and the second terminal of the fifteenth resistor R15 is connected to the second terminal of the fourteenth resistor R14. The fourteenth resistor R14 and the fifteenth resistor R15 serve as a voltage divider.

[0064] The first end of the sixteenth resistor R16 is connected to the second end of the sixth resistor R6, and the second end of the sixteenth resistor R16 is connected to the inverting input of the second amplifier U3. The sixteenth resistor R16 serves as a current limiter. The first end of the seventeenth resistor R17 is connected to the inverting input of the second amplifier U3, and the seventeenth resistor R17 is connected to the output of the second amplifier U3. The seventeenth resistor R17 serves as a low-pass filter.

[0065] Specifically, the current detection circuit 60 also includes an eighteenth resistor R18 and a nineteenth resistor R19. The first end of the eighteenth resistor R18 is connected to the second preset power supply, the first end of the eighteenth resistor R18 is connected to the non-inverting input of the second comparator U4, the first end of the nineteenth resistor R19 is connected to the output of the first amplifier U2, and the second end of the eighteenth resistor R18 is connected to the inverting input of the second comparator U4. The eighteenth resistor R18 is used to limit the current of the second reference electrical signal output by the second preset power supply, and the nineteenth resistor R19 is used to limit the current of the sampling electrical signal of the sixth resistor R6 after differential amplification.

[0066] When the electrical equipment is under load, the operating current will change dynamically. If the operating current or the equipment load current exceeds the current limit set by the second preset power supply, the current induces a certain voltage value through the sixth resistor R6 connected in series with the bus, which is then amplified by the differential sampling amplifier circuit composed of the second amplifier U3 (amplification factor is...). The induced voltage is amplified and sent to the negative input of the second comparator U4. It is compared with the second reference signal output by the second preset power supply. If the voltage is larger than the second reference signal, the output voltage of the second comparator U4 approaches the voltage value of VEE. Due to the unidirectional conduction characteristic of the first diode D1, the gate voltage of the first switch Q1 will be pulled down, thereby reducing the output voltage VOUT at the output port. The voltage induced on the sixth resistor R6 will also decrease. Thus, the voltage value at the negative input of the second comparator U4 decreases until it approaches the voltage value of the second reference signal. The output voltage of the second comparator U4 will also approach VCC. At this time, the output voltage state of the second comparator U4 will not affect the gate voltage of the first switch Q1, that is, VOUT is the desired voltage output. This dynamic working process is based on the principle of negative feedback amplification.

[0067] Specifically, the relationships between the parameters of the voltage compensation circuit 100 can be made as follows:

[0068]

[0069] Where I is the current flowing through the busbar, and V2 is the voltage value corresponding to the second preset power supply.

[0070] like Figure 6 As shown, Figure 6 This is a schematic block diagram of an electronic device 1000 provided in an embodiment of this application. The electronic device 1000 includes a power module 200 and a voltage compensation circuit 100, which is used to compensate the voltage of the power module 200.

[0071] The voltage compensation circuit 100 can be referred to as follows: Figures 1 to 5 Examples of configurations can be used, such as a voltage compensation circuit 100 including a sampling circuit 10, a voltage processing circuit 20, a first voltage feedback circuit 30, and a driving circuit 40. The specific configuration of the voltage compensation circuit 100 can be found in the corresponding embodiments described in this application specification, which will not be repeated here. The electronic device provided in this application embodiment can perform voltage compensation on the power module 200 through hardware, thereby reducing the cost and debugging workload of the power supply equipment and improving the dynamic response characteristics of the power supply equipment.

[0072] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, referring to direct connection or indirect connection through an intermediate medium, and can refer to the internal connection of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0073] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. A voltage compensation circuit, characterized in that, The voltage compensation circuit is used to compensate the voltage output of the power module. The power module includes an input port and an output port, which are connected via a bus. The voltage compensation circuit includes: A sampling circuit is used to acquire the sampled electrical signal output from the output port; A voltage processing circuit is connected to the sampling circuit. The voltage processing circuit is used to differentially amplify the sampled electrical signal to obtain the target electrical signal. A first voltage feedback circuit is connected to the voltage processing circuit, and the first voltage feedback circuit is used to output a drive signal according to the target electrical signal; A driving circuit is connected to the first voltage feedback circuit. The driving circuit is disposed on the bus and is used to connect the input port and the output port. It is also used to control the sampled electrical signal to be within a preset voltage range according to the driving signal. The second voltage feedback circuit is connected to the driving circuit and the first voltage feedback circuit. The second voltage feedback circuit is used to obtain the voltage value output by the driving circuit and feed back the high-frequency change of the voltage value to the first voltage feedback circuit to change the target electrical signal. The second voltage feedback circuit includes: A first capacitor, with its first end connected to the output terminal of the driving circuit and its second end connected to the first voltage feedback circuit. A first resistor, the first end of which is connected to the voltage processing circuit, and the second end of which is connected to the second end of the first capacitor; The second resistor has its first end connected to the second end of the first resistor, and its second end grounded.

2. The voltage compensation circuit according to claim 1, characterized in that, The first voltage feedback circuit includes: The first comparator has its non-inverting input connected to a first preset power supply, its inverting input connected to a second voltage feedback circuit and the voltage processing circuit, and its output connected to the driving circuit. The first comparator is used to output a driving signal according to the modified target electrical signal.

3. The voltage compensation circuit according to claim 2, characterized in that, The first voltage feedback circuit includes: The third resistor has its first end connected to the non-inverting input of the first comparator and its second end connected to the first preset power supply. The third resistor is used to limit the current of the voltage signal output by the first preset power supply. The fourth resistor has its first end connected to the inverting input of the first comparator and its second end connected to the second voltage feedback circuit and the voltage processing circuit. The fourth resistor is used to limit the current of the target electrical signal. The fifth resistor has its first end connected to the output of the first comparator and its second end connected to the driving circuit. The fifth resistor is used to limit the current of the driving signal.

4. The voltage compensation circuit according to claim 1, characterized in that, The voltage processing circuit includes: The first amplifier has its non-inverting and inverting input terminals connected to the sampling circuit, and its output terminal connected to the second voltage feedback circuit. The first amplifier is used to differentially amplify the sampled electrical signal to obtain the target electrical signal.

5. The voltage compensation circuit according to claim 1, characterized in that, The driving circuit includes: The first switching transistor has its control terminal connected to the first voltage feedback circuit and its first terminal connected to the input port. The first switching transistor is used to control the opening degree of the first switching transistor according to the driving signal, so as to control the sampling electrical signal output by the output port to be within a preset voltage range. The sixth resistor, the first end of which is connected to the second end of the first switching transistor; The seventh resistor has its first end connected to the second end of the sixth resistor, and its second end connected to the output port.

6. The voltage compensation circuit according to claim 5, characterized in that, The voltage compensation circuit also includes: A current detection circuit is connected to the second terminal of the first switching transistor and the control terminal of the first switching transistor. The current detection circuit is used to acquire the sampling electrical signal of the sixth resistor and generate a voltage feedback signal based on the sampling electrical signal, so as to change the driving signal according to the voltage feedback signal.

7. The voltage compensation circuit according to claim 6, characterized in that, The current detection circuit includes: The second amplifier has its non-inverting input connected to the sixth resistor and its inverting input connected to the sixth resistor. The second amplifier is used to differentially amplify the sampled electrical signal from the sixth resistor. The second comparator has its non-inverting input connected to a second preset power supply and its inverting input connected to the output of the second amplifier. The first diode has its anode connected to the control terminal of the first switching transistor and its cathode connected to the output terminal of the second comparator. The first diode is used to pull down the drive signal when the second comparator outputs a low-level signal.

8. An electronic device, characterized in that, The electronic device includes a power supply module and a voltage compensation circuit as described in any one of claims 1-7, wherein the voltage compensation circuit is used to compensate the voltage of the power supply module.

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