A digital power supply control circuit

Abstract

The present invention discloses a digital power supply control circuit, comprising: a converter module and a digital control module connected to each other; the digital control module comprises an ADC unit, a loop calculation unit, a feedforward calculation unit, a PWM limiter unit and a PWM generating unit connected in sequence; the converter module is used to send the input voltage and output voltage of the power converter to the digital control module; the loop calculation unit is used to receive the digital output voltage and a preset output voltage reference value, and perform digital loop processing according to the digital output voltage and the preset output voltage reference value to obtain a first PWM control signal; the feedforward calculation unit is used to receive the digital input voltage and the preset input voltage reference value, and perform division operation according to the digital input voltage and the preset input voltage reference value to obtain a second PWM control signal. The present invention solves the problem that the output voltage ripple cannot be suppressed and the input voltage conversion response is slow.

Description

Technical Field

[0001] The present invention relates to the technical field of power converters, and in particular to a digital power control circuit. Background Art

[0002] In a power converter, there is a certain linear relationship between the output voltage and the input voltage. When the input voltage changes, the output voltage changes accordingly. In order to keep the output voltage stable, the voltage output is generally collected for feedback closed-loop control. However, due to the high switching frequency of the power supply and the presence of delay elements such as inductors and capacitors in the circuit, the change of the feedback voltage lags behind the change of the input voltage, and the system's response and regulation are relatively slow, which can easily cause large transient deviations.

[0003] The current mainstream control schemes are divided into current mode and voltage mode according to the different control objects. However, the current mode requires two feedback loops, slope compensation is required in the continuous mode with a duty cycle greater than 50%, and it is sensitive to current noise. In the voltage mode, since the loop control does not involve input voltage conversion, the input voltage does not participate in the closed-loop control of the feedback loop, and therefore the response to input voltage changes is slow. Summary of the invention

[0004] The present invention provides a digital power supply control circuit to solve the technical problems in the prior art that the output voltage ripple cannot be suppressed and the input voltage conversion response is slow.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a digital power supply control circuit, comprising: a converter module and a digital control module connected to each other; the digital control module comprises an ADC unit, a loop calculation unit, a feedforward calculation unit, a PWM limit unit and a PWM generation unit connected in sequence;

[0006] The converter module is used to send the input voltage and output voltage of the power converter to the digital control module;

[0007] The ADC unit is used to receive the input voltage and the output voltage sent by the converter module, and convert the input voltage and the output voltage into a digital input voltage and a digital output voltage;

[0008] The loop calculation unit is used to receive the digital output voltage and a preset output voltage reference value, and perform digital loop processing according to the digital output voltage and the preset output voltage reference value to obtain a first PWM control signal;

[0009] The feedforward calculation unit is used to receive the digital input voltage and a preset input voltage reference value, and perform a division operation according to the digital input voltage and the preset input voltage reference value to obtain a second PWM control signal;

[0010] The PWM amplitude limiting unit is used to receive and perform amplitude limiting processing according to the first PWM control signal, the second PWM control signal and a preset PWM signal period to obtain a PWM control signal;

[0011] The PWM generating unit is used to receive the PWM control signal and generate a PWM signal according to the PWM control signal, thereby outputting the PWM signal to the converter module, so that the converter module outputs an output voltage with ripple suppressed.

[0012] As a preferred solution, the loop calculation unit is used to receive the digital output voltage and the preset output voltage reference value, and perform digital loop processing according to the digital output voltage and the preset output voltage reference value to obtain the first PWM control signal, specifically including:

[0013] Sampling the digital output voltage through a zero-order holder;

[0014] Receiving an input preset output voltage reference value, and performing a difference calculation between the sampled digital output voltage and the preset output voltage reference value to obtain an error signal;

[0015] Digital loop processing is performed according to the error signal so that a compensator model including three zeros and three poles is constructed according to the error signal, and the constructed compensator model is converted into a discrete model, so that the error signal is used as an input of the model to obtain a first PWM control signal.

[0016] As a preferred solution, the feedforward calculation unit is used to receive the digital input voltage and the preset input voltage reference value, and perform a division operation according to the digital input voltage and the preset input voltage reference value to obtain the second PWM control signal, specifically including:

[0017] Sampling the digital input voltage through a zero-order holder;

[0018] The input preset input voltage reference value is received, and the sampled digital input voltage and the preset input voltage reference value are divided so that a second PWM control signal is obtained by taking the preset input voltage reference value as the dividend and the sampled digital input voltage as the divisor.

[0019] As a preferred solution, the PWM limiting unit is used to receive and perform limiting processing according to the first PWM control signal, the second PWM control signal and the preset PWM signal period to obtain a PWM control signal, specifically including:

[0020] receiving a first PWM control signal output by the loop calculation unit and a second PWM control signal output by the feedforward calculation unit, and performing an addition operation on the first PWM control signal and the second PWM control signal to obtain a PWM control addition signal;

[0021] A preset PWM signal cycle is received, and a limiting process is performed according to the PWM control addition signal and the preset PWM signal cycle to obtain a PWM control signal.

[0022] As a preferred solution, the PWM generating unit is used to receive the PWM control signal and generate a PWM signal according to the PWM control signal, thereby outputting the PWM signal to the converter module so that the converter module outputs an output voltage with ripple suppression, specifically including:

[0023] Receive the PWM control signal, and generate a first PWM signal and a second PWM signal according to the PWM control signal; wherein the PWM signal includes the first PWM signal and the second PWM signal;

[0024] The first PWM signal is output to the corresponding voltage input unit in the converter module, and the second PWM signal is output to the corresponding voltage output unit in the converter module, so that the converter module performs feed-forward control on the input voltage and the output voltage in the converter module respectively through the input first PWM signal and the second PWM signal, so that the converter module outputs the output voltage with ripple suppression; wherein the converter module includes a voltage input unit and a voltage output unit.

[0025] As a preferred solution, the converter module includes a voltage input unit and a voltage output unit; the voltage input unit and the voltage output unit are connected;

[0026] The input end of the voltage input unit is also connected to the first output end of the digital control module that outputs the first PWM signal, and the output end of the voltage input unit is also connected to the first input end of the digital control module that receives the input voltage;

[0027] The input end of the voltage output unit is also connected to the second output end of the digital control module for inputting a second PWM signal, and the output end of the voltage output unit is also connected to the second input end of the digital control module for receiving an output voltage.

[0028] As a preferred solution, the voltage input unit includes: an AC signal input terminal, a rectifier, a first capacitor, a first selector, an input voltage terminal and a first MOS tube;

[0029] The input end of the rectifier is connected to the AC signal input end, the positive output end of the rectifier is connected to the first end of the first capacitor, the positive end of the first selector, the input voltage end and the drain of the first MOS tube, and the negative output end of the rectifier, the second end of the first capacitor and the negative end of the first selector are all grounded;

[0030] The gate of the first MOS tube is connected to a first output terminal of the digital control module that outputs a first PWM signal, and the output terminal of the first selector is connected to a first input terminal of the digital control module that receives an input voltage.

[0031] As a preferred solution, the voltage output unit includes: an output voltage terminal, a drain-source voltage terminal, a second selector, an inductor, a second capacitor, a resistor and a second MOS tube;

[0032] The positive terminal of the second selector is connected to the output voltage terminal, the first terminal of the resistor, the first terminal of the second capacitor and the first terminal of the inductor, and the negative terminal of the second selector, the second terminal of the resistor, the second terminal of the second capacitor and the source of the second MOS tube are grounded;

[0033] The drain of the second MOS tube is connected to the second end of the inductor and the drain-source voltage end, the gate of the second MOS tube is connected to the second output end of the digital control module that outputs the second PWM signal, and the output end of the second selector is connected to the second input end of the digital control module that receives the output voltage.

[0034] As a preferred solution, the source of the first MOS tube is connected to the drain of the second MOS tube.

[0035] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0036] The technical solution of the present invention can perform loop calculation and feedforward calculation on the input voltage and output voltage sent by the converter module respectively through the interconnected converter module and digital control module, and the ADC unit, loop calculation unit, feedforward calculation unit, PWM limiting unit and PWM generating unit connected in sequence in the digital control module, so that the calculation results obtained respectively are used for the generation of PWM limiting and PWM signals, and are fed back to the converter module to control the input voltage and output voltage, thereby ensuring that the converter module can output the output voltage after ripple suppression, and at the same time realizing the feedforward function of the input voltage and output voltage in the digital controller, thereby improving the conversion response of the input voltage and also improving the performance of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1: A structural diagram of a digital power supply control circuit provided by an embodiment of the present invention;

[0038] Figure 2 : A schematic diagram showing the comparative effects of the embodiment without feedforward and with feedforward provided by the present invention;

[0039] Figure 3 : A specific structural diagram of a digital power supply control circuit provided by an embodiment of the present invention;

[0040] Figure 4 : A schematic diagram of an ADC unit provided in an embodiment of the present invention;

[0041] Figure 5 : A schematic diagram of a loop calculation unit provided in an embodiment of the present invention;

[0042] Figure 6 : A schematic diagram of a feedforward calculation unit provided in an embodiment of the present invention;

[0043] Figure 7 : A schematic diagram of a PWM amplitude limiting unit provided in an embodiment of the present invention;

[0044] Figure 8 : A schematic diagram of a PWM generating unit provided in an embodiment of the present invention;

[0045] The reference numerals of the drawings in the specification are as follows:

[0046] Converter module 01, digital control module 02, ADC unit 201, loop calculation unit 202, feedforward calculation unit 203, PWM limiting unit 204, PWM generating unit 205, AC signal input terminal S1, rectifier G1, first capacitor C1, first selector S2, first MOS tube Q1, second selector S3, resistor R, second capacitor C2, inductor L, second MOS tube Q2. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Embodiment 1

[0049] Please refer to Figure 1, a digital power supply control circuit provided by an embodiment of the present invention, includes: a converter module 01 and a digital control module 02 connected to each other; the digital control module 02 includes an ADC unit 201, a loop calculation unit 202, a feedforward calculation unit 203, a PWM limiting unit 204 and a PWM generating unit 205 connected in sequence.

[0050] In this embodiment, preferably, the digital control module 02 can be based on a DSP280XX series chip to execute the method implemented by the ADC unit 201, loop calculation unit 202, feedforward calculation unit 203, PWM limiter unit 204 and PWM generator unit 205 in this embodiment. Exemplarily, the simulation of this embodiment can be performed by calling the peripherals of the DSP28035 chip to obtain the effect diagram of the input voltage and output voltage of the feedforward control to obtain the ripple suppression, as shown in FIG. Figure 2 shown.

[0051] The converter module 01 is used to send the input voltage and output voltage of the power converter to the digital control module 02 .

[0052] In this embodiment, the power converter can receive power of one voltage level and convert it into another voltage or current level to meet the power requirements of different devices. Among them, the power converter is very important in various electronic systems and can provide voltage and current suitable for specific requirements of the device.

[0053] As a preferred solution of this embodiment, the converter module 01 includes a voltage input unit and a voltage output unit; the voltage input unit and the voltage output unit are connected; the input end of the voltage input unit is also connected to the first output end of the digital control module 02 that outputs the first PWM signal, and the output end of the voltage input unit is also connected to the first input end of the digital control module 02 that receives the input voltage; the input end of the voltage output unit is also connected to the second output end of the digital control module 02 that inputs the second PWM signal, and the output end of the voltage output unit is also connected to the second input end of the digital control module 02 that receives the output voltage.

[0054] As a preferred solution of this embodiment, the source of the first MOS transistor Q1 is connected to the drain of the second MOS transistor Q2.

[0055] In this example, see Figure 3, where Vo is the output voltage, Vin is the input voltage, Vds is the drain-source voltage, V_ref is the output voltage reference value, and V_ref1 is the input voltage reference value. The connection relationship between the voltage input unit and the voltage output unit is realized by connecting the source of the first MOS tube Q1 and the drain of the second MOS tube Q2, where the drain-source voltage terminal is also connected between the source of the first MOS tube Q1 and the drain of the second MOS tube Q2, where the voltage of the drain-source voltage terminal can be determined according to the specifications of the first MOS tube Q1 and the second MOS tube Q2 adopted according to actual needs.

[0056] As a preferred solution of this embodiment, the voltage input unit includes: an AC signal input terminal S1, a rectifier G1, a first capacitor C1, a first selector S2, an input voltage terminal and a first MOS tube Q1; the input terminal of the rectifier G1 is connected to the AC signal input terminal S1, the positive output terminal of the rectifier G1 is connected to the first end of the first capacitor C1, the positive terminal of the first selector S2, the input voltage terminal and the drain of the first MOS tube Q1, and the negative output terminal of the rectifier G1, the second end of the first capacitor C1, and the negative terminal of the first selector S2 are all grounded; the gate of the first MOS tube Q1 is connected to the first output terminal of the digital control module 02 that outputs the first PWM signal, and the output terminal of the first selector S2 is connected to the first input terminal of the digital control module 02 that receives the input voltage.

[0057] In this embodiment, preferably, the AC signal input terminal S1 in the voltage input unit can be a sinusoidal signal input terminal; the AC signal input terminal S1 is connected to the rectifier G1, so that the input voltage in the voltage input terminal is selected through the first capacitor C1 and the first selector S2 connected to the rectifier G1, and then the input voltage of the voltage input unit is output through the first selector S2, and then the input voltage is output to the first input terminal of the digital control module 02. Preferably, the capacitance of the first capacitor C1 can be 1000uF.

[0058] In this embodiment, the source of the first MOS transistor Q1 is connected to the drain of the second MOS transistor Q2, the drain of the first MOS transistor Q1 is connected to the positive output end of the rectifier G1, and the gate of the first MOS transistor Q1 is connected to the first output end of the first PWM signal output of the digital control unit, so that the first MOS transistor Q1 can be controlled by the first PWM signal to achieve control of the input voltage.

[0059] As a preferred solution of this embodiment, the voltage output unit includes: an output voltage terminal, a drain-source voltage terminal, a second selector S3, an inductor L, a second capacitor C2, a resistor R and a second MOS transistor Q2; the positive terminal of the second selector S3 is connected to the output voltage terminal, the first end of the resistor R, the first end of the second capacitor C2 and the first end of the inductor L, the negative terminal of the second selector S3, the second end of the resistor R, the second end of the second capacitor C2 and the source of the second MOS transistor Q2 are grounded; the drain of the second MOS transistor Q2 is connected to the second end of the inductor L and the drain-source voltage terminal, the gate of the second MOS transistor Q2 is connected to the second output terminal of the digital control module 02 that outputs the second PWM signal, and the output terminal of the second selector S3 is connected to the second input terminal of the digital control module 02 that receives the output voltage.

[0060] In this embodiment, the output voltage of the power converter is selected by the second selector S3, so that the output voltage is output through the resistor R, the second capacitor C2, the inductor L and the second MOS tube Q2 connected to the second selector S3, and then the output voltage is output to the second input terminal of the digital control module 02. Preferably, the resistance value of the resistor R is 5Ω, the capacitance of the second capacitor C2 is 47uF, and the inductor L is 0.1mh.

[0061] In this embodiment, the source of the second MOS transistor Q2 is connected to the negative terminal of the second selector S3, the drain of the second MOS transistor Q2 is connected to the source of the first MOS transistor Q1, and the gate of the second MOS transistor Q2 is connected to the second output terminal of the second PWM signal output of the digital control unit, so that the second MOS transistor Q2 can be controlled by the second PWM signal to achieve control of the output voltage, so as to suppress the ripple of the output voltage oscillation.

[0062] See also Figure 4 The ADC unit 201 is used to receive the input voltage and the output voltage sent by the converter module 01, and convert the input voltage and the output voltage into a digital input voltage and a digital output voltage.

[0063] In this embodiment, the ADC unit 201 is mainly used to convert the input voltage analog signal into a digital signal that can be digitally processed and calculated. Preferably, the ADC unit 201 can be a chip of the F2803X series. For example, the F2803X chip includes analog signal input pins A1 to A7 and B1 to B7, and digital signal output pins D0 to D15, wherein the A0 pin is connected to the output end of the second selector S3, that is, the A0 pin is used as the second input end of the digital control module 02 receiving the output voltage, and the D0 pin is used as the digital signal of the corresponding output voltage output by performing analog-to-digital conversion on the output voltage; and the A1 pin is connected to the output end of the first selector S2, that is, the A1 pin is used as the first input end of the digital control module 02 receiving the input voltage, and the D1 pin is used as the digital signal of the corresponding input voltage output by performing analog-to-digital conversion on the input voltage.

[0064] See also Figure 5 The loop calculation unit 202 is used to receive the digital output voltage and the preset output voltage reference value, and perform digital loop processing according to the digital output voltage and the preset output voltage reference value to obtain a first PWM control signal.

[0065] As a preferred solution of this embodiment, the loop calculation unit 202 is used to receive the digital output voltage and the preset output voltage reference value, and perform digital loop processing according to the digital output voltage and the preset output voltage reference value to obtain the first PWM control signal, specifically including:

[0066] The digital output voltage is sampled through a zero-order holder; an input preset output voltage reference value is received, and a difference is calculated between the sampled digital output voltage and the preset output voltage reference value to obtain an error signal; digital loop processing is performed according to the error signal, so that a compensator model including three zeros and three poles is constructed according to the error signal, and the constructed compensator model is converted into a discrete model, so that the error signal is used as an input of the model to obtain a first PWM control signal.

[0067] In this embodiment, the loop calculation unit 202 is mainly used to perform digital loop processing on the output voltage and the output voltage reference value. Preferably, the discrete time signal of the output voltage digital signal is converted into a continuous time signal through a ZOH, i.e., a zero-order holder, so as to achieve sampling and holding of the output voltage, and then calculate the difference between the output voltage and the preset output voltage reference value through a preset output voltage reference value, as the input of the 3P3Z (3-Po le / 3-Zero, three zeros and three poles) digital loop processing. Among them, the output voltage reference value can be set according to actual needs and application scenarios.

[0068] In this embodiment, the 3P3Z digital loop processing needs to first construct a 3P3Z compensator model, which includes three zeros and three poles. 3P3Z is the result of digitally converting the analog controlled Type III compensator, and then converting the 3P3Z compensator model in the analog domain into a discrete time model to adapt to the working mode of the digital controller, which involves converting the transfer function in the s domain into the z domain or q domain. Then, based on the compensator model, the coefficients of the digital filter are calculated, so as to generate the first PWM control signal according to the calculated filter coefficients.

[0069] The feedforward calculation unit 203 is used to receive the digital input voltage and a preset input voltage reference value, and perform a division operation according to the digital input voltage and the preset input voltage reference value to obtain a second PWM control signal.

[0070] As a preferred solution of this embodiment, the feedforward calculation unit 203 is used to receive the digital input voltage and the preset input voltage reference value, and perform a division operation according to the digital input voltage and the preset input voltage reference value to obtain a second PWM control signal, specifically including:

[0071] The digital input voltage is sampled through a zero-order holder; the input preset input voltage reference value is received, and the sampled digital input voltage and the preset input voltage reference value are divided, so that a second PWM control signal is obtained by taking the sampled digital input voltage as the dividend and the sampled digital input voltage as the divisor.

[0072] In this example, see Figure 6 The feedforward calculation unit 203 is mainly used to perform DIVD (abbreviation of Divider, divider) division operation on the input voltage and the input voltage reference value; this embodiment adopts synchronous rectification control technology, and the input-output characteristics of the BUCK (converter) circuit are Vo=Vi n*Don, wherein Vo is the output voltage, Vin is the input voltage, and Don is the duty cycle. When Vin is known and the target output voltage Vo=Vref, it can be deduced that Don=Vref / Vi n, so this control code can be introduced into the original control loop to realize the feedforward function; wherein, the input voltage reference value can be set according to actual needs and application scenarios.

[0073] See also Figure 7 The PWM amplitude limiting unit 204 is used to receive and perform amplitude limiting processing according to the first PWM control signal, the second PWM control signal and the preset PWM signal period to obtain a PWM control signal.

[0074] As a preferred solution of this embodiment, the PWM limiting unit 204 is used to receive and perform limiting processing according to the first PWM control signal, the second PWM control signal and the preset PWM signal period to obtain a PWM control signal, specifically including:

[0075] Receive the first PWM control signal output by the loop calculation unit 202 and the second PWM control signal output by the feedforward calculation unit 203, and add the first PWM control signal and the second PWM control signal to obtain a PWM control addition signal; receive a preset PWM signal period, and perform limiting processing according to the PWM control addition signal and the preset PWM signal period to obtain a PWM control signal.

[0076] In this embodiment, the preset PWM signal period can be set according to actual needs and application scenarios, and the PWM control addition signal after the addition operation of the first PWM control signal and the second PWM control signal, and the preset PWM signal period are subjected to amplitude limiting control. The amplitude limiting control can use hardware amplitude limiting (for example, using a diode, a clamping circuit or a dedicated amplitude limiting chip to limit the peak value of the PWM signal), software amplitude limiting (setting the maximum and minimum thresholds in the software or microcontroller programming that generates the PWM signal), a filter (which can reduce the problem of unintentional signal amplitude limiting caused by noise), a dead time (when using a PWM control switch device (such as a transistor or MOSFET), setting the dead time can prevent the direct conduction of the upper and lower bridge arms), etc.

[0077] See also Figure 8 The PWM generating unit 205 is used to receive the PWM control signal and generate a PWM signal according to the PWM control signal, thereby outputting the PWM signal to the converter module 01, so that the converter module 01 outputs an output voltage with ripple suppression.

[0078] As a preferred solution of this embodiment, the PWM generating unit 205 is used to receive the PWM control signal and generate a PWM signal according to the PWM control signal, thereby outputting the PWM signal to the converter module 01, so that the converter module 01 outputs an output voltage after ripple suppression, specifically including:

[0079] Receive the PWM control signal, and generate a first PWM signal and a second PWM signal according to the PWM control signal; wherein the PWM signal includes a first PWM signal and a second PWM signal; output the first PWM signal to a corresponding voltage input unit in the converter module 01, and output the second PWM signal to a corresponding voltage output unit in the converter module 01, so that the converter module 01 performs feed-forward control on an input voltage and an output voltage in the converter module 01 respectively through the input first PWM signal and the second PWM signal, so that the converter module 01 outputs an output voltage with ripple suppression; wherein the converter module 01 includes a voltage input unit and a voltage output unit.

[0080] In this embodiment, the PWM control signal obtained by the amplitude limiting process is input into the PWM generating unit 205, thereby generating the first PWM signal (PMW_A) and the second PWM signal (PMW_B), wherein the PWM generating unit 205 may be a 1-phPWM unit (PWM1 high byte register), preferably, its model may be a series chip of F2803X. By outputting the first PWM signal to the corresponding voltage input unit in the converter module 01, and outputting the second PWM signal to the corresponding voltage output unit in the converter module 01, the first PWM signal can control the switch of the first MOS tube Q1, and the second PWM signal can control the switch of the second MOS tube Q2, thereby realizing the ripple suppression of the output voltage, and also reducing the ripple of the output current. The specific effect diagram is shown in FIG. Figure 2 shown.

[0081] Implementing the above embodiments has the following effects:

[0082] The technical solution of the present invention can perform loop calculation and feedforward calculation on the input voltage and output voltage sent by the converter module respectively through the interconnected converter module and digital control module, and the ADC unit, loop calculation unit, feedforward calculation unit, PWM limiting unit and PWM generating unit connected in sequence in the digital control module, so that the calculation results obtained respectively are used for the generation of PWM limiting and PWM signals, and are fed back to the converter module to control the input voltage and output voltage, thereby ensuring that the converter module can output the output voltage after ripple suppression, and at the same time realizing the feedforward function of the input voltage and output voltage in the digital controller, thereby improving the conversion response of the input voltage and also improving the performance of the converter.

[0083] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A digital power control circuit, characterized in that: include: A converter module and a digital control module connected to each other; the digital control module includes an ADC unit, a loop calculation unit, a feedforward calculation unit, a PWM limiting unit and a PWM generating unit connected in sequence; The converter module is used to send the input voltage and output voltage of the power converter to the digital control module; The ADC unit is used to receive the input voltage and the output voltage sent by the converter module, and convert the input voltage and the output voltage into a digital input voltage and a digital output voltage; The loop calculation unit is used to receive the digital output voltage and a preset output voltage reference value, and perform digital loop processing according to the digital output voltage and the preset output voltage reference value to obtain a first PWM control signal; The feedforward calculation unit is used to receive the digital input voltage and a preset input voltage reference value, and perform a division operation according to the digital input voltage and the preset input voltage reference value to obtain a second PWM control signal; The PWM amplitude limiting unit is used to receive and perform amplitude limiting processing according to the first PWM control signal, the second PWM control signal and a preset PWM signal period to obtain a PWM control signal; The PWM generating unit is used to receive the PWM control signal and generate a PWM signal according to the PWM control signal, thereby outputting the PWM signal to the converter module, so that the converter module outputs an output voltage with ripple suppression; The PWM generating unit is used to receive the PWM control signal and generate a PWM signal according to the PWM control signal, thereby outputting the PWM signal to the converter module, so that the converter module outputs an output voltage after ripple suppression, specifically comprising: Receive the PWM control signal, and generate a first PWM signal and a second PWM signal according to the PWM control signal; wherein the PWM signal includes the first PWM signal and the second PWM signal; The first PWM signal is output to the corresponding voltage input unit in the converter module, and the second PWM signal is output to the corresponding voltage output unit in the converter module, so that the converter module performs feed-forward control on the input voltage and the output voltage in the converter module respectively through the input first PWM signal and the second PWM signal, so that the converter module outputs the output voltage with ripple suppression; wherein the converter module includes a voltage input unit and a voltage output unit.

2. A digital power control circuit as claimed in claim 1, characterized in that: The loop calculation unit is used to receive the digital output voltage and the preset output voltage reference value, and perform digital loop processing according to the digital output voltage and the preset output voltage reference value to obtain a first PWM control signal, specifically including: Sampling the digital output voltage through a zero-order holder; Receiving an input preset output voltage reference value, and performing a difference calculation between the sampled digital output voltage and the preset output voltage reference value to obtain an error signal; Digital loop processing is performed according to the error signal so that a compensator model including three zeros and three poles is constructed according to the error signal, and the constructed compensator model is converted into a discrete model, so that the error signal is used as an input of the model to obtain a first PWM control signal.

3. A digital power control circuit as claimed in claim 1, characterized in that: The feedforward calculation unit is used to receive the digital input voltage and the preset input voltage reference value, and perform a division operation according to the digital input voltage and the preset input voltage reference value to obtain a second PWM control signal, specifically including: Sampling the digital input voltage through a zero-order holder; The input preset input voltage reference value is received, and the preset input voltage reference value is used as the dividend, the sampled digital input voltage is used as the divisor, and a division operation is performed based on the sampled digital input voltage and the preset input voltage reference value to obtain a second PWM control signal.

4. A digital power control circuit as claimed in claim 1, characterized in that: The PWM amplitude limiting unit is used to receive and perform amplitude limiting processing according to the first PWM control signal, the second PWM control signal and the preset PWM signal period to obtain a PWM control signal, specifically including: receiving a first PWM control signal output by the loop calculation unit and a second PWM control signal output by the feedforward calculation unit, and performing an addition operation on the first PWM control signal and the second PWM control signal to obtain a PWM control addition signal; A preset PWM signal cycle is received, and a limiting process is performed according to the PWM control addition signal and the preset PWM signal cycle to obtain a PWM control signal.

5. A digital power control circuit as claimed in claim 1, characterized in that: The converter module comprises a voltage input unit and a voltage output unit; the voltage input unit and the voltage output unit are connected; The input end of the voltage input unit is also connected to the first output end of the digital control module that outputs the first PWM signal, and the output end of the voltage input unit is also connected to the first input end of the digital control module that receives the input voltage; The input end of the voltage output unit is also connected to the second output end of the digital control module for inputting a second PWM signal, and the output end of the voltage output unit is also connected to the second input end of the digital control module for receiving an output voltage.

6. A digital power control circuit as claimed in claim 5, characterized in that: The voltage input unit comprises: an AC signal input terminal, a rectifier, a first capacitor, a first selector, an input voltage terminal and a first MOS tube; The input end of the rectifier is connected to the AC signal input end, the positive output end of the rectifier is connected to the first end of the first capacitor, the positive end of the first selector, the input voltage end and the drain of the first MOS tube, and the negative output end of the rectifier, the second end of the first capacitor and the negative end of the first selector are all grounded; The gate of the first MOS tube is connected to a first output terminal of the digital control module that outputs a first PWM signal, and the output terminal of the first selector is connected to a first input terminal of the digital control module that receives an input voltage.

7. A digital power control circuit as claimed in claim 6, characterized in that: The voltage output unit comprises: an output voltage terminal, a drain-source voltage terminal, a second selector, an inductor, a second capacitor, a resistor and a second MOS tube; The positive terminal of the second selector is connected to the output voltage terminal, the first terminal of the resistor, the first terminal of the second capacitor and the first terminal of the inductor, and the negative terminal of the second selector, the second terminal of the resistor, the second terminal of the second capacitor and the source of the second MOS tube are grounded; The drain of the second MOS tube is connected to the second end of the inductor and the drain-source voltage end, the gate of the second MOS tube is connected to the second output end of the digital control module that outputs the second PWM signal, and the output end of the second selector is connected to the second input end of the digital control module that receives the output voltage.

8. A digital power control circuit as claimed in claim 7, characterized in that: The source of the first MOS tube is connected to the drain of the second MOS tube.

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