Voltage adjustment circuit, chip and electronic device

Abstract

The application discloses a voltage adjusting circuit, a chip and electronic equipment, and the circuit comprises a voltage input module, a control module connected with the voltage input module and generating a control signal according to an input voltage, a voltage output module connected with the voltage input module and the control module and outputting a target voltage according to the input voltage and the control signal, and a compensation module connected with the control module and comprising a correction unit, wherein the correction unit increases a correction amount according to a change amount of the input voltage, so that the compensation module can compensate according to the change amount of the input voltage, and the correction amount is a variable related to a current direct current average value of the input voltage. The voltage adjusting circuit, the chip and the electronic equipment provided by the application can quickly respond and provide a compensation current in the case that the input voltage or the load current in the circuit changes, so that the circuit can output a stable target voltage and over-shoot and under-shoot phenomena do not occur.

Description

Technical Field

[0001] This invention relates to the field of integrated circuit technology, and in particular to a voltage regulation circuit, chip, and electronic device. Background Technology

[0002] In the power driver management chip of AMOLED (Active-matrix organic light-emitting diode), there is a TDMA (Time Division Multiple Access) test requirement: the input power supply is subjected to interference at regular intervals, fluctuating upwards or downwards by 500mV within 10μs, and this 500mV fluctuation must last for at least 500μs. Figure 2 As shown. If such interference occurs, the output of the DC-DC Boost architecture will definitely have either overshoot or undershoot. This disturbance must be less than 20mV under loads up to 200mA and less than 60mV under loads up to 1A.

[0003] exist Figure 1 In the voltage adjustment circuit 100 shown, the first transistor Q1 is a PMOS freewheeling transistor, and the second transistor Q2 is an NMOS switching transistor. The first transistor Q1 and the second transistor Q2 are turned on alternately to ensure that the current in the inductor L is continuous. Due to the operation amplifier OP and the fourth transistor Q4, the four-terminal voltages of the first transistor Q1 and its mirror image, the third transistor Q3, are completely identical, and the current sampling ratio satisfies the proportional relationship m = W. Q1 / W Q2 Sampling current Isense = I L / m, the current flowing into the sampling resistor Rramp meets the system's requirements for sampling current.

[0004] Furthermore, the feedback voltage signal Vfb = Vout * [R2 / (R1+R2)] is used. The comparator COMP adjusts the duty cycle of the entire system's PWM signal by comparing the relationship between the output voltage Vea of ​​the error amplifier gm and the ramp compensation voltage Vramp. The frequency of the PWM signal is determined by the clock signal CLK output by the oscillator. The reference resistor Rea and the reference capacitor Cea are used to compensate for the stability of the entire boost loop under different current load conditions.

[0005] However, if the input voltage Vin changes and jumps, the output current does not change abruptly. It needs to wait until the output voltage Vout changes and is reflected in the feedback voltage signal Vfb before being amplified to the output voltage Vea by the error amplifier gm. Then, the comparator COMP compares the changes and adjusts the duty cycle of the PWM to adjust the change in the output voltage Vout again. The whole process can be simply described as Vin→Vout→Vfb→Vea→Cmp_out→PWM→Vout.

[0006] However, Figure 1 The voltage adjustment circuit 100 shown cannot respond quickly to changes in the input voltage Vin, especially for input voltages with different average values, such as when the input voltage changes from 2.9V to 3.4V, and it cannot adjust the output voltage Vout in a timely manner.

[0007] Therefore, the relevant technology cannot quickly track changes in the average value of the input power supply, which often leads to disturbances such as overshoot and undershoot in the output voltage, resulting in unstable output voltage. Summary of the Invention

[0008] In view of the above problems, the purpose of this invention is to provide a voltage regulation circuit, chip and electronic device, which, by adopting a compensation module, can quickly respond to changes in the input voltage or load current in the circuit and provide compensation current, thereby enabling the circuit to output a stable target voltage without excessive overshoot or undershoot.

[0009] According to one aspect of the present invention, a voltage adjustment circuit is provided, comprising: a voltage input module for receiving an input voltage; a control module connected to the voltage input module for generating a control signal based on the input voltage; a voltage output module connected to the voltage input module and the control module for outputting a target voltage based on the input voltage and the control signal; and a compensation module connected to the control module for generating a compensation current based on a change in the input voltage, wherein the compensation module includes a correction unit that adds a correction amount based on the change in the input voltage, so that the compensation module can compensate according to the change in the input voltage, the correction amount being a variable related to the current DC average value of the input voltage; and the control module adjusting the control signal based on the compensation current so that the voltage output module can output a stable target voltage.

[0010] Optionally, the correction unit includes: a filter, the first terminal of which receives the input voltage and the second terminal of which outputs the average value of the input voltage; a subtractor, the first terminal of which is connected to the second terminal of the filter and the second terminal of which outputs the difference between a constant and the average value of the input voltage; and an adder, the adder having three terminals, the first terminal of which is connected to the second terminal of the subtractor, the second terminal of which receives the input voltage, and the third terminal of which outputs the sum of the difference output by the subtractor and the input voltage.

[0011] Optionally, the compensation current is the sum of the first compensation current and the second compensation current.

[0012] Optionally, the voltage output module includes a load current detection unit, the second terminal of which is connected to the output terminal of the target voltage, and the third terminal of which is connected to the compensation module. The load current detection unit is used to determine the load current and obtain the load voltage based on the load current.

[0013] Optionally, the compensation module further includes: a first compensation unit, which includes a non-inverting input terminal, an inverting input terminal, and an output terminal. The non-inverting input terminal is connected to the output terminal of the correction unit, the inverting input terminal is connected to the ground terminal, and the output terminal outputs the first compensation current. The first compensation unit amplifies the output signal of the correction unit to generate the first compensation current.

[0014] Optionally, the compensation module further includes: a multiplication unit connected to the load current detection unit, used to obtain an intermediate voltage based on the input voltage and the load voltage; and a second compensation unit, which includes a non-inverting input terminal, an inverting input terminal, and an output terminal, wherein the non-inverting input terminal is connected to the multiplication unit, the inverting input terminal is grounded, and the output terminal is connected to the output terminal of the first compensation unit, and the second compensation unit generates the second compensation current based on the intermediate voltage.

[0015] Optionally, the voltage input module includes: an input capacitor, the first end of which is connected to a DC voltage input terminal and the second end of which is connected to a ground terminal; and an inductor, the first end of which is connected to the first end of the input capacitor and the second end of which is connected to the voltage output module.

[0016] Optionally, the control module includes: an error amplifier, comprising a non-inverting input terminal, an inverting input terminal, and an output terminal, wherein the non-inverting input terminal is connected to a voltage output module for receiving a feedback voltage signal, and the inverting input terminal is connected to a reference voltage input terminal; a reference resistor, wherein a first terminal of the reference resistor is connected to the output terminal of the error amplifier; a reference capacitor, wherein a first terminal of the reference capacitor is connected to a second terminal of the reference resistor, and the second terminal is connected to a ground terminal; a current source, wherein a first terminal of the current source is connected to a first terminal of an inductor in the voltage input module; a sampling capacitor, wherein a first terminal of the sampling capacitor is connected to a second terminal of the current source; and a sampling resistor, wherein a first terminal of the sampling resistor is connected to a second terminal of the sampling capacitor, and the second terminal is connected to a ground terminal. Connections: a reset switch, the first end of which is connected to the first end of the sampling capacitor, and the second end of which is connected to the second end of the sampling capacitor; a comparator, including a non-inverting input, an inverting input, and an output, the non-inverting input being connected to the second end of the current source, and the inverting input being connected to the output of the error amplifier; a trigger, including a first input, a second input, and an output, the first input being connected to the output of the comparator; an oscillator, the output of which is connected to the second input of the trigger; and a PWM control unit, including an input, a first output, and a second output, the input of which is connected to the output of the trigger, and both the first and second outputs being connected to the voltage output module.

[0017] Optionally, the voltage output module includes: a first transistor, wherein a first path terminal of the first transistor is connected to a second terminal of the inductor of the voltage input module, a second path terminal is connected to the load current detection unit, and a control terminal is connected to a second output terminal of the control module; a second transistor, wherein a first path terminal of the second transistor is connected to a first path terminal of the first transistor, a second path terminal is connected to a ground terminal, and a control terminal is connected to a first output terminal of the control module; a third transistor, wherein a first path terminal of the third transistor is connected to a first path terminal of the first transistor, and a control terminal is connected to a control terminal of the first transistor; and a fourth transistor, wherein a first path terminal of the fourth transistor is connected to a second path terminal of the third transistor, and a second... The path terminal is connected to the output terminal of the compensation module; the operational amplifier includes a non-inverting input terminal, an inverting input terminal, and an output terminal, wherein the non-inverting input terminal is connected to the second path terminal of the third transistor, the inverting input terminal is connected to the second path terminal of the first transistor, and the output terminal is connected to the control terminal of the fourth transistor; a first resistor, wherein the first end of the first resistor is connected to the second terminal of the load current detection unit, and the second end is connected to the control module; a second resistor, wherein the first end of the second resistor is connected to the second end of the first resistor, and the second end is connected to the ground terminal; an output capacitor, wherein the first end of the output capacitor is connected to the first end of the first resistor, and the second end is connected to the ground terminal, wherein the second end of the first resistor outputs a feedback voltage signal.

[0018] According to another aspect of the present invention, a chip is provided, the chip including the voltage adjustment circuit described above.

[0019] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising the chip described above.

[0020] The voltage adjustment circuit, chip, and electronic device provided in this application include a voltage adjustment circuit whose compensation module has a non-inverting input terminal of the first compensation unit connected to the DC voltage input terminal via a correction unit. This allows the compensation module to respond quickly whenever the input voltage changes or the average value of the input voltage changes, inputting a compensation current to the control module to generate a control signal. The voltage output module can output a stable target voltage based on the control signal, without excessive overshoot or undershoot.

[0021] Furthermore, the voltage adjustment circuit, chip, and electronic device provided in this application also include a load current detection unit in the voltage output module. The load current detection unit is located between the first transistor and the DC voltage output terminal. It can be used to detect the load current and convert it into a load voltage to be fed back to the compensation module. The multiplication unit and the second compensation unit in the compensation module are used to receive the load voltage. Therefore, as long as either the input voltage or the load current in the circuit changes, the compensation module can respond quickly and input the compensation current to the control module to generate a control signal. The voltage output module can output a stable target voltage according to the control signal without excessive overshoot or undershoot.

[0022] The voltage regulation circuit proposed in this disclosure can output a stable target voltage, respond quickly to changes in input voltage, and has reliable and stable characteristics. Attached Figure Description

[0023] The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0024] Figure 1 A schematic diagram of a voltage regulation circuit according to the prior art is shown;

[0025] Figure 2 A schematic diagram of the test voltage variation of a voltage adjustment circuit according to the prior art is shown;

[0026] Figure 3 A schematic diagram of a voltage regulation circuit according to an embodiment of the present invention is shown;

[0027] Figure 4 A schematic diagram of the correction unit in a voltage adjustment circuit according to an embodiment of the present invention is shown;

[0028] Figure 5a and Figure 5b A schematic diagram of voltage variation of a voltage regulation circuit according to an embodiment of the present invention is shown. Detailed Implementation

[0029] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0030] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0031] Figure 3 A schematic diagram of a voltage regulation circuit according to an embodiment of the present invention is shown; Figure 4A schematic diagram of the correction unit in a voltage adjustment circuit according to an embodiment of the present invention is shown; Figure 5a and Figure 5b A schematic diagram of voltage variation of a voltage regulation circuit according to an embodiment of the present invention is shown.

[0032] refer to Figure 3 The voltage adjustment circuit 200 of this embodiment includes: a DC voltage input terminal Vin, a DC voltage output terminal Vout, a voltage input module 110, a control module 120, a voltage output module 230, and a compensation module 240. The voltage input module 110 is connected to the control module 120 and the voltage output module 130, and the control module 120 is connected to the compensation module 240 and the voltage output module 230. The voltage output by the DC voltage output terminal Vout is the target voltage.

[0033] Specifically, the voltage input module 110 includes an input capacitor C. IN And inductor L, input capacitor C IN Connected between the DC voltage input terminal Vin and the ground terminal GND, the first end of the inductor L is connected to the DC voltage input terminal Vin, and the second end is connected to the voltage output module 230.

[0034] The control module 120 includes: an error amplifier (gm), a reference resistor Rea, a reference capacitor Cea, a comparator COMP, an oscillator, a trigger, a PWM control driver, a current source Iramp, a reset switch Vreset, a sampling capacitor Crap, and a sampling resistor Rramp. The error amplifier gm includes a non-inverting input, an inverting input, and an output. Its non-inverting input is connected to the voltage output module 230 to receive the feedback voltage signal Vfb from the voltage output module 230, and its inverting input is connected to the reference voltage Vref input. The first terminal of the reference resistor Rea is connected to the output of the error amplifier gm. The first terminal of the reference capacitor Cea is connected to the second terminal of the reference resistor Rea, and the second terminal is connected to the ground terminal GND. The first terminal of the current source Iramp is connected to the first terminal of the inductor L in the voltage input module 110. The first terminal of the sampling capacitor Crap is connected to the second terminal of the current source Iramp, and the second terminal is connected to the voltage output module 230 to receive the sampling current Isense from the voltage output module 230. The first terminal of the sampling resistor Rramp is connected to the second terminal of the sampling capacitor Crap, with the voltage at the midpoint of the connection being, for example, the sampling voltage Vsense, and the second terminal is connected to the ground terminal GND. Connections: The first terminal of the reset switch Vreset is connected to the first terminal of the sampling capacitor Cramp, and the second terminal is connected to the second terminal of the sampling capacitor Cramp. The reset switch Vreset is turned on and off according to the reset voltage. The comparator COMP includes a non-inverting input terminal, an inverting input terminal, and an output terminal. Its non-inverting input terminal is connected to the second terminal of the current source Iramp and is used to input the ramp compensation voltage Vramp. Its inverting input terminal is connected to the output terminal of the error amplifier gm. The trigger includes a first input terminal R, a second input terminal S, and an output terminal Q. Its first input terminal R is connected to the output terminal of the comparator COMP. The oscillator is used to generate the clock signal CLK, and the output terminal of the oscillator is connected to the second input terminal S of the trigger. The PWM control unit includes an input terminal, a first output terminal, and a second output terminal. Its input terminal is connected to the output terminal of the trigger. Both the first and second output terminals are connected to the voltage output module 230.

[0035] In this embodiment, the trigger can be configured, for example, to output a high level (1) at the first input terminal R and a low level (0) at the second input terminal S. In this embodiment, the PWM control unit can be configured, for example, to output a high level (1) at the input terminal and a low level (0) at the input terminal.

[0036] The voltage output module 230 may include a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, an operational amplifier OP, a first resistor R1, a second resistor R2, and an output capacitor C. OUT And a load current detection unit. Specifically, the first path terminal of the first transistor Q1 is connected to the second terminal of the inductor L in the voltage input module 110, and its control terminal is connected to the second output terminal of the PWM control unit in the control module 120; the first path terminal of the second transistor Q2 is connected to the first path terminal of the first transistor Q1, its second path terminal is connected to the ground terminal GND, and its control terminal is connected to the first output terminal of the PWM control unit in the control module 120; the first path terminal of the third transistor Q3 is connected to the first path terminal of the first transistor Q1, and its control terminal is connected to the control terminal of the first transistor Q1; the first path terminal of the fourth transistor Q4 is connected to the second path terminal of the third transistor Q3, and its second path terminal is connected to the control module 120, used to provide a sampling current Isense; the load current detection unit includes three... The first terminal is connected to the second path terminal of the first transistor Q1, the second terminal is connected to the DC voltage output terminal Vout, and the third terminal is connected to the compensation module 240 for outputting the load voltage Vctrl. The operational amplifier OP includes a non-inverting input terminal, an inverting input terminal, and an output terminal. Its non-inverting input terminal is connected to the second path terminal of the third transistor Q3, its inverting input terminal is connected to the second path terminal of the first transistor Q1, and its output terminal is connected to the control terminal of the fourth transistor Q4. The first terminal of the first resistor R1 is connected to the second terminal of the load current detection unit. The first terminal of the second resistor R2 is connected to the second terminal of the first resistor R1, and its second terminal is connected to the ground terminal GND. The first terminal of the output capacitor Cout is connected to the second terminal of the load current detection unit, and its second terminal is connected to the ground terminal GND. Among them, the first resistor R1 and the second resistor R2 are connected in series, and the midpoint of the connection between the two resistors is connected to the first input terminal of the error amplifier gm in the control module 120 for providing the feedback voltage signal Vfb.

[0037] In this embodiment, the first transistor Q1 is, for example, a PMOS freewheeling transistor, and the second transistor Q2 is an NMOS switching transistor. The control signals output from the two output terminals of the PWM control unit are the same, but since the first transistor Q1 and the second transistor Q2 are respectively turned on at high level and low level, the first transistor Q1 and the second transistor Q2 are turned on alternately.

[0038] Furthermore, the voltage output module 230 includes a load current detection unit, load sense, located between the second path terminal of the first transistor Q1 and the DC voltage output terminal Vout. This unit detects the load current Iload and generates a load voltage Vctrl based on the load current Iload. The value of the load voltage Vctrl output by the load current detection unit load sense is:

[0039] Vctal = α * Iload,

[0040] Here, α is a preset parameter, and * represents a multiplication operation.

[0041] The compensation module 240 includes a first compensation unit (gm1) 241, a second compensation unit (gm2) 242, a multiplication unit 243, and a correction unit (Vin plus) 244. The first compensation unit 241 includes a non-inverting input terminal, an inverting input terminal, and an output terminal. Its inverting input terminal is connected to the ground terminal GND, and its output terminal is connected to the second terminal of the sampling capacitor Cramp in the control module 120. The second compensation unit 242 includes a non-inverting input terminal, an inverting input terminal, and an output terminal. Its inverting input terminal is connected to the ground terminal GND, and its output terminal is connected to the output terminal of the first compensation unit 241. The multiplication unit 243 includes two input terminals and one output terminal. Its first input terminal is connected to the DC voltage input terminal Vin, and its second input terminal is connected to the third terminal of the load current detection unit load sense in the voltage output module 230 to receive the load voltage Vctrl. Its output terminal is connected to the non-inverting input terminal of the second compensation unit 242. The first terminal of the correction unit (Vin plus) 244 is connected to the DC voltage input terminal Vin, and its second terminal is connected to the non-inverting input terminal of the first compensation unit 241.

[0042] Among them, the multiplication unit 243 is used to generate an intermediate voltage based on the input voltage Vin and the load voltage Vctrl; the correction unit (Vin plus) 244 is used to generate a correction amount based on the input voltage Vin, which is a variable related to the current DC average value of the input voltage Vin; the first compensation unit 241 is used to output a first compensation current Isink1, and the second compensation unit 242 is used to output a second compensation current Isink2.

[0043] In this embodiment, the structural schematic diagram of the correction unit 244 in the compensation module 240 is as follows: Figure 4 As shown, the correction unit 244 includes a filter 2441, a subtractor 2442, and an adder 2443. Specifically, the first terminal of the filter 2441 is connected to the DC voltage input terminal Vin, and the filter 2441 receives the input voltage Vin and outputs the average value of the input voltage Vin. The first terminal of subtractor 2442 is connected to the second terminal of filter 2441, and subtractor 2442 is used to average the input voltage Vin. To perform subtraction, for example, the signal output by subtractor 2442 is... Adder 2443 includes three terminals. The first terminal is connected to the second terminal of subtractor 2442, the second terminal is connected to the DC voltage input terminal Vin, and the third terminal serves as the second terminal of the entire correction unit 244, connected to the non-inverting input terminal of the first compensation unit 241. The signal output by adder 2443 is, for example,

[0044] Furthermore, since the correction unit 244 is located between the non-inverting input terminal and the DC voltage input terminal Vin of the first compensation unit 241, it can correct the first compensation current Isink1 output by the first compensation unit 241. The correction unit 244 essentially adds a variable related to the current DC average value of the input voltage Vin to the change in input voltage Vin, ΔVin. For the same output voltage Vout, different input voltages introduce an average value related to the input voltage Vin. The relevant increments can improve the performance of line-transient. Line-transient refers to transient overvoltage or overcurrent caused by sudden changes in current or voltage.

[0045] Further, refer to Figure 3 When the input voltage Vin of the voltage adjustment circuit 200 changes by a jump of ΔVin, the multiplication unit 243 generates an output voltage Vmultipie based on the load voltage Vctrl and the DC voltage Vin. The value of the output voltage Vmultipie is:

[0046] Vmultipie=β*Vctrl*Vin=α*β*Iload*Vin,

[0047] Wherein, β is a preset parameter.

[0048] The change in the compensation current Isink, which is ultimately applied to the reference resistor Rramp, by the compensation module 240 is:

[0049]

[0050] Therefore, according to the above formula, the part before the plus sign can compensate for changes in load current, while the part after the plus sign can compensate for changes in the average value of the input voltage Vin, thereby enabling the present application to... Figure 3In the voltage regulation circuit shown, regardless of changes in the load and input voltage Vin, the peak-to-peak value Vpp of the output voltage Vout can be effectively controlled within 20mV. Here, peak-to-peak value Vpp represents the difference between the maximum and minimum values ​​of the voltage waveform within one cycle.

[0051] Furthermore, Figure 5a for Figure 3 The voltage regulation circuit shown exhibits the peak-to-peak value variation of the output voltage Vout under different load currents Iload when the input voltage Vin is 2.9V, 3.4V, and 3.9V without correction unit 244. Figure 5b for Figure 3 The voltage regulation circuit 200 shown exhibits the peak-to-peak value variation of its output voltage Vout under input voltages Vin of 2.9V, 3.4V, and 3.9V, and under different load currents Iload.

[0052] refer to Figure 5a and Figure 5b It can be understood that without the correction unit 244, the structure of fixed voltage compensation and load current compensation alone is insufficient for different input voltages Vin. When the input voltage Vin is low, the compensation amount is insufficient, and the peak-to-peak value of the output voltage Vout Vpp is somewhat large. However, the voltage adjustment circuit 200 of this embodiment is significantly better than... Figure 1 The voltage adjustment circuit 100 shown not only ensures that the output voltage Vout can quickly respond to changes in the input voltage Vin, but also ensures that the output voltage Vout meets the requirements of the specification (SPEC) for fast-line excitation of the power supply in TDMA testing, regardless of the load or the average value of the input voltage Vin. This meets the TDMA testing requirements of AMOLED in various application environments.

[0053] Furthermore, this application also provides a chip that includes the aforementioned voltage adjustment circuit.

[0054] Furthermore, this application also provides an electronic device including the aforementioned chip. The electronic device includes a display screen. It can be a smartphone or a portable device.

[0055] The voltage adjustment circuit, chip, and electronic device provided in this application include a voltage adjustment circuit whose compensation module has a non-inverting input terminal of the first compensation unit connected to the DC voltage input terminal via a correction unit. This allows the compensation module to respond quickly whenever the input voltage changes or the average value of the input voltage changes, inputting a compensation current to the control module to generate a control signal. The voltage output module can output a stable target voltage based on the control signal, without excessive overshoot or undershoot.

[0056] Furthermore, the voltage adjustment circuit, chip, and electronic device provided in this application also include a load current detection unit in the voltage output module. The load current detection unit is located between the first transistor and the DC voltage output terminal. It can be used to detect the load current and convert it into a load voltage to be fed back to the compensation module. The multiplication unit and the second compensation unit in the compensation module are used to receive the load voltage. Therefore, as long as either the input voltage or the load current in the circuit changes, the compensation module can respond quickly and input the compensation current to the control module to generate a control signal. The voltage output module can output a stable target voltage according to the control signal without excessive overshoot or undershoot.

[0057] The voltage regulation circuit proposed in this disclosure can output a stable target voltage, respond quickly to changes in input voltage, and has reliable and stable characteristics.

[0058] As described above, these embodiments of the present invention do not exhaustively cover all details, nor do they limit the invention to the specific embodiments described. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A voltage regulation circuit, comprising: Voltage input module, receives input voltage; The control module is connected to the voltage input module and generates a control signal based on the input voltage; A voltage output module, connected to the voltage input module and the control module, outputs a target voltage based on the input voltage and the control signal; The compensation module, connected to the control module, generates a compensation current based on the change in the input voltage. The compensation module includes a correction unit that generates a correction amount based on the change in the input voltage, so that the compensation module can generate a compensation current based on the change in the input voltage. The correction amount is a variable related to the current DC average value of the input voltage. The control module receives the compensation current to generate an adjusted control signal. The correction unit includes: a filter, the first terminal of which receives the input voltage and the second terminal of which outputs the average value of the input voltage; a subtractor, the first terminal of which is connected to the second terminal of the filter and the second terminal of which outputs the difference between a constant and the average value of the input voltage; and an adder, the adder having three terminals, the first terminal of which is connected to the second terminal of the subtractor, the second terminal of which receives the input voltage, and the third terminal of which outputs the sum of the difference output by the subtractor and the input voltage.

2. The voltage adjustment circuit according to claim 1, characterized in that, The compensation current is the sum of the first compensation current and the second compensation current.

3. The voltage adjustment circuit according to claim 2, characterized in that, The voltage output module includes: A load current detection unit is provided, with its second terminal connected to the output terminal of the target voltage and its third terminal connected to the compensation module. The load current detection unit is used to determine the load current and obtain the load voltage based on the load current.

4. The voltage adjustment circuit according to claim 3, characterized in that, The compensation module also includes: The first compensation unit includes a non-inverting input terminal, an inverting input terminal, and an output terminal. Its non-inverting input terminal is connected to the output terminal of the correction unit, its inverting input terminal is connected to ground, and its output terminal outputs the first compensation current. The first compensation unit amplifies the output signal of the correction unit to generate the first compensation current.

5. The voltage adjustment circuit according to claim 4, characterized in that, The compensation module also includes: A multiplication unit, connected to the load current detection unit, is used to obtain an intermediate voltage based on the input voltage and the load voltage; The second compensation unit includes a non-inverting input terminal, an inverting input terminal, and an output terminal. Its non-inverting input terminal is connected to the multiplication unit, its inverting input terminal is grounded, and its output terminal is connected to the output terminal of the first compensation unit. The second compensation unit generates the second compensation current based on the intermediate voltage.

6. The voltage regulation circuit according to claim 1, characterized in that, The voltage input module includes: An input capacitor, wherein the first end of the input capacitor is connected to the DC voltage input terminal and the second end is connected to the ground terminal; An inductor, the first end of which is connected to the first end of the input capacitor, and the second end of which is connected to the voltage output module.

7. The voltage regulation circuit according to claim 1, characterized in that, The control module includes: The error amplifier includes a non-inverting input terminal, an inverting input terminal, and an output terminal. Its non-inverting input terminal is connected to the voltage output module to receive the feedback voltage signal, and its inverting input terminal is connected to the reference voltage input terminal. A reference resistor, the first end of which is connected to the output terminal of the error amplifier; A reference capacitor, wherein a first terminal of the reference capacitor is connected to a second terminal of the reference resistor, and the second terminal is connected to a ground terminal; A current source, the first end of which is connected to the first end of the inductor in the voltage input module; A sampling capacitor, wherein the first terminal of the sampling capacitor is connected to the second terminal of the current source; A sampling resistor, wherein the first end of the sampling resistor is connected to the second end of the sampling capacitor, and the second end is connected to the ground terminal; A reset switch, wherein the first end of the reset switch is connected to the first end of the sampling capacitor, and the second end of the reset switch is connected to the second end of the sampling capacitor; The comparator includes a non-inverting input terminal, an inverting input terminal, and an output terminal. Its non-inverting input terminal is connected to the second terminal of the current source, and its inverting input terminal is connected to the output terminal of the error amplifier. The trigger includes a first input terminal, a second input terminal, and an output terminal, wherein the first input terminal is connected to the output terminal of the comparator; An oscillator, the output of which is connected to the second input of the trigger; The PWM control unit includes an input terminal, a first output terminal, and a second output terminal. Its input terminal is connected to the output terminal of the trigger, and both the first and second output terminals are connected to the voltage output module.

8. The voltage adjustment circuit according to claim 3, characterized in that, The voltage output module also includes: The first transistor has a first path terminal connected to the second terminal of the inductor of the voltage input module, a second path terminal connected to the load current detection unit, and a control terminal connected to the second output terminal of the control module. The second transistor has a first path terminal connected to the first path terminal of the first transistor, a second path terminal connected to the ground terminal, and a control terminal connected to the first output terminal of the control module. The third transistor has its first path terminal connected to the first path terminal of the first transistor and its control terminal connected to the control terminal of the first transistor. The fourth transistor has its first path terminal connected to the second path terminal of the third transistor, and the second path terminal is connected to the output terminal of the compensation module. An operational amplifier includes a non-inverting input terminal, an inverting input terminal, and an output terminal. The non-inverting input terminal is connected to the second path terminal of the third transistor, the inverting input terminal is connected to the second path terminal of the first transistor, and the output terminal is connected to the control terminal of the fourth transistor. A first resistor, the first end of which is connected to the second end of the load current detection unit, and the second end of which is connected to the control module; The second resistor has a first end connected to the second end of the first resistor and a second end connected to the ground terminal. The output capacitor has its first terminal connected to the first terminal of the first resistor, and its second terminal connected to the ground terminal. The second terminal of the first resistor outputs a feedback voltage signal.

9. A chip, characterized in that, The chip includes a voltage regulation circuit as described in any one of claims 1-8.

10. An electronic device, characterized in that, The electronic device includes the chip as described in claim 9.

Images