Rapid dynamic voltage regulation method based on self-calibration multi-phase Buck circuit

Abstract

The invention discloses a rapid dynamic voltage regulation method based on a self-calibration multi-phase Buck circuit, and the method comprises the steps: enabling a control module to judge an upper voltage regulation condition or a lower voltage regulation condition in real time according to the change direction of an input voltage and an output voltage in a dynamic voltage regulation process, solving the optimal connection time and disconnection time in real time through a time optimal control algorithm, and achieving the rapid dynamic voltage regulation of the multi-phase Buck circuit. And smooth transition and no over-regulation of the output voltage are ensured. When it is detected that the reference voltage rises, the multi-phase Buck circuit immediately sends an instruction for prolonging the conduction time to each phase of switch tube, so that the inductive current rapidly rises and charges an output capacitor; when the output voltage is close to the target value, the turn-off time is kept, and the capacitor voltage is naturally transited to a new steady-state value; when it is detected that the reference voltage drops, the turn-off time is maintained for discharging, then the switch-on stage is started, and the turn-on time is maintained, so that smooth voltage drop is achieved. According to the invention, the voltage transition time can be shortened, and the following speed of the output voltage can reach more than 50mV / mu s.

Description

Technical Field

[0001] This invention relates to the field of power electronics and integrated circuit technology, and in particular to a fast dynamic voltage regulation method based on a self-calibrating multiphase Buck circuit. Background Technology

[0002] With the rapid evolution of the information technology industry, cloud computing servers are placing higher demands on data processing and response speeds, which in turn is driving up the performance requirements of power converters. In practical applications, the last-stage VRM (Voltage Regulator Module) closest to the processor often employs a multiphase Buck converter architecture. This structure offers advantages such as effectively reducing output voltage ripple, decreasing equivalent inductance, and distributing load current and power losses across each phase. However, multiphase Buck converters still face several key challenges, primarily including efficiency and losses, dynamic response and stability, as well as compatibility and electromagnetic interference (EMI). In transient regulation, the converter must be able to quickly and stably adjust the output voltage according to system load demands to achieve reliable DVS (Dynamic Voltage Scaling); in steady-state operation, the output voltage needs to follow the reference voltage as accurately as possible.

[0003] In transient voltage regulation (DVS), most mainstream digital power supplies currently employ a stepped adjustment method for the reference voltage. However, this approach has limitations: while reducing the reference voltage change rate enhances stability, it leads to an excessively slow output voltage transition; conversely, increasing the reference voltage change rate shortens the transition time but easily causes voltage overshoot. Therefore, it is difficult to achieve an ideal balance between speed and stability simply by adjusting the reference voltage. In summary, an ideal DVS scheme should simultaneously minimize the output voltage transition time and suppress overshoot / undershoot. Current research primarily focuses on analog control, highlighting the potential for optimization through digital control.

[0004] Therefore, there is an urgent need for a multiphase Buck converter structure and control method that can achieve high-speed, non-overshoot dynamic voltage regulation. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide a fast dynamic voltage regulation method based on a self-calibrating multiphase Buck circuit to solve the problems of slow DVS regulation speed and severe output overshoot in the prior art; to realize a dynamic voltage regulation strategy based on the concept of Time Optimal Control (TOC), shorten the voltage transition time and eliminate overshoot, so that the output voltage following speed can reach more than 50mV / μs.

[0006] Technical solution: A fast dynamic voltage regulation method based on a self-calibrating multiphase Buck circuit, wherein the self-calibrating multiphase Buck circuit consists of a Buck main control loop, a current sampling module, a voltage sampling module, a digital control module, and a PWM generation module;

[0007] The output of the Buck main control circuit is connected to the input of the current sampling module, and the input is connected to the PWM generation module; it includes a multiphase Buck main topology circuit and a ramp voltage generator.

[0008] The input terminal of the current sampling module is connected to the output terminal of the Buck main control circuit, and the output terminal is connected to the digital control module to acquire the inductor current of each phase and generate the total current signal.

[0009] The input terminal of the voltage sampling module is connected to the output terminal of the Buck main control circuit, and the output terminal is connected to the digital control module. It is used to sample the output voltage using an ADC and send it to the digital control module.

[0010] The input terminal of the digital control module is connected to the output terminals of the current sampling module and the voltage sampling module, and the output terminal is connected to the PWM generation module; it includes a fast dynamic voltage regulation unit and a DC deviation self-calibration unit.

[0011] The input terminal of the PWM generation module is connected to the output terminal of the digital control module, and the output terminal is connected to the Buck main control circuit; it is used to output the PWM drive waveform of each phase according to the control signal VTR generated by the digital control module.

[0012] The steps include the following:

[0013] S1 converts the total inductor current signal obtained by superimposing the inductor currents of all phases into a proportional voltage signal through a current mirror and a resistor; one voltage signal is then filtered to extract the AC component V. Iac By comparing with the original total current signal V Iac+ V Idc Subtraction yields another voltage signal V. Idc Superimposed onto the negative terminal of the comparator;

[0014] S2, provide the reference signal V REF By superimposing a ramp signal, the corrected reference voltage V is obtained. REF_NEW ;

[0015] S3, the corrected reference voltage V REF_NEWThe positive and negative terminals serve as inputs to the comparator, which outputs the control signal VTR to the PWM generation module to obtain the switching signals for each phase. In steady state, the PWM generation module outputs switching signals with a constant on-time according to the control signal VTR. If the high-level duration of the control signal VTR exceeds a preset value, it indicates that the converter has entered a transient state: if no voltage adjustment command is received, it indicates that the converter has entered a load switching transient state, and a switching signal is generated with a preset transient on-time; if a voltage adjustment command is received, it indicates that the converter has entered a dynamic voltage regulation transient state.

[0016] Furthermore, during dynamic voltage regulation, the control module determines in real time whether the voltage is being increased or decreased based on the direction of change in the input and output voltages, and uses a time-optimal control algorithm to solve for the optimal on-time T in real time. on and shutdown time T off This ensures a smooth output voltage transition without overshoot.

[0017] Furthermore, when a rise in the reference voltage is detected, the multiphase Buck circuit immediately issues a command to each phase switch to extend the on-time, causing the inductor current to rise rapidly and charge the output capacitor; once the output voltage approaches the target value, the off-time T is maintained. off This allows the capacitor voltage to naturally transition to a new steady-state value.

[0018] When a drop in the reference voltage is detected, the off-time T is maintained. off Discharge occurs, then the conduction phase begins, and the conduction time is maintained for T. on This is to achieve a smooth voltage drop.

[0019] Furthermore, the implementation of the time-optimal control algorithm is as follows:

[0020] First, the rate of change of the output voltage at the transition start and end points is constrained to zero by boundary conditions;

[0021] Then, by applying the law of conservation of energy and the dynamic balance between inductance and capacitance, the unique corresponding conduction time T can be derived. on Or shutdown time T off On-time T on Or shutdown time T off The expression is calculated by the digital control module immediately after each voltage regulation command is triggered, as follows:

[0022] ,

[0023] ,

[0024] Where L is the total inductance of the multiphase Buck converter, and C is the total capacitance of the multiphase Buck converter; VO1 V is the initial voltage before voltage regulation. O2 For steady-state voltage, V in This is the input voltage of the multiphase Buck converter.

[0025] Compared with the prior art, the significant advantages of this invention are as follows:

[0026] 1. The fast dynamic voltage regulation method based on Time-Optimal Control (TOC) proposed in this invention can calculate the optimal turn-on time and turn-off time in real time after detecting a change in the reference voltage, enabling the output voltage to transition along the shortest path without overshoot. By jointly modeling the input voltage, output voltage, and circuit parameters, coordinated control of inductor energy and capacitor voltage is achieved, thus obtaining a globally optimal solution between voltage regulation speed and stability. Compared with traditional stepped voltage regulation methods, this invention improves the voltage following speed to 50 mV / μs while maintaining no overshoot, providing an efficient and reliable implementation method for fast DVS (Dynamic Voltage Regulation) in high-performance processors.

[0027] 2. This invention employs a variable on-time current-mode control architecture, dynamically modifying the on and off durations of each phase's PWM signal based on TOC calculations during transients, thereby overcoming the response bottleneck caused by fixed timing. The system can quickly establish the optimal phase control mode under arbitrary load changes, achieving synchronous accelerated voltage regulation of multi-phase Buck converters. This current-mode control architecture significantly improves the overshoot problem of traditional Buck circuits during large voltage steps and effectively shortens the dynamic transition time, resulting in a smoother output voltage response.

[0028] 3. The control algorithm of this invention is entirely based on digital implementation and is suitable for FPGA or ASIC integration. By using a polynomial approximation of the time-optimal control model, complex trigonometric function calculations are avoided, resulting in extremely low computational resource consumption. The system automatically pauses the calibration loop when dynamic voltage regulation or soft-start states are detected, ensuring that calibration and main control do not interfere with each other, thus achieving an optimal balance between fast response and steady-state accuracy. This method is simple in structure, robust, and can be widely applied to high-frequency, high-phase-number VRMs and other power supply systems with stringent requirements for dynamic voltage accuracy. Attached Figure Description

[0029] Figure 1 A block diagram of a self-calibrating multiphase Buck converter system provided by the present invention;

[0030] Figure 2 This is a diagram of the COT simulation main loop architecture provided by the present invention;

[0031] Figure 3 This is a schematic diagram of the dynamic voltage regulation process;

[0032] Figure 4 This is a schematic diagram of the time-optimal control process;

[0033] Figure 5 A waveform diagram of the fast dynamic voltage regulation algorithm provided by this invention;

[0034] Figure 6 The SIMPLIS simulation waveform diagram is the simulation waveform of the fast dynamic voltage regulation (1V~1.5V) of this invention;

[0035] Figure 7 The image shows the SIMPLIS simulation waveforms for the traditional step-by-step adjustment of the reference voltage. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Figure 1 This is a system block diagram of the self-calibrating multiphase Buck converter proposed in this invention. A self-calibrating multiphase Buck converter mainly consists of a Buck main control circuit, a current sampling module, a voltage sampling module, a digital control module, and a PWM generation module. Its analog section mainly includes the Buck main control circuit; the current sampling module, used to acquire the inductor current of each phase and generate a total current signal; and the voltage sampling module, used to perform ADC sampling on the output voltage and send it to the digital control module. The digital section mainly includes the digital control module, including a fast dynamic voltage regulation unit and a DC deviation self-calibration unit; and the PWM generation module, which outputs PWM drive waveforms for each phase according to the control signal.

[0038] The output of the Buck main control circuit is connected to the input of the current sampling module, and the input is connected to the PWM generation module. It mainly includes a multiphase Buck main topology circuit and a ramp generator.

[0039] The input terminal of the current sampling module is connected to the output terminal of the Buck main control circuit, and the output terminal is connected to the digital control module to acquire the inductor current of each phase and generate the total current signal.

[0040] The input terminal of the voltage sampling module is connected to the output terminal of the Buck main control circuit, and the output terminal is connected to the digital control module. It is used to sample the output voltage using an ADC and send it to the digital control module.

[0041] The input terminal of the digital control module is connected to the output terminals of the current sampling module and the voltage sampling module, and the output terminal is connected to the PWM generation module.

[0042] The input of the PWM generation module is connected to the output of the digital control module, and the output is connected to the Buck main control circuit. It is used to output PWM drive waveforms for each phase based on the control signals generated by the digital control module.

[0043] The self-calibrating multiphase Buck converter uses a multiphase Buck topology as its core, with multiple phase-interleaved power stages sharing the output current. The current sampling module collects the inductor current signals iL1~iLn of each phase and sums them to obtain the total current signal I_SUM. The voltage sampling module samples the output voltage Vout using an ADC and inputs it to the digital control module for subsequent feedback control and self-calibration calculations. The digital control module generates a control signal VTR based on the current and voltage feedback signals and outputs a multiphase PWM drive waveform to the main power stage through a PWM generation module, achieving precise voltage regulation.

[0044] Figure 2 This is a diagram of the Buck main loop architecture provided by the present invention. The loop employs a current-mode control structure, including a voltage loop, a slope compensation branch, and a current feedback branch. The voltage signal used for comparison is a modified reference voltage V. REF_NEW With slope compensation signal V SLOPE Superimposed composition. To achieve DC error calibration of the output voltage, the feedback voltage V... FB The voltage is sampled by the ADC and calibrated by the digital module. The resulting compensation is then superimposed on the reference voltage and output by the DAC to obtain V. REF_NEW Because the phases of a multiphase Buck converter are interleaved and connected in parallel, the total inductor current ripple is reduced due to cancellation. Therefore, a slope compensation signal of a certain amplitude needs to be superimposed to improve the stability of the loop. The current signal V participating in the comparison... Idc The total inductor current is obtained through appropriate processing. The total inductor current signal is obtained by superimposing the inductor currents of all phases of the multiphase Buck converter, and then converted into a proportional voltage signal through a current mirror and resistors. One of the voltage signals is filtered to extract the AC component V. Iac By comparing with the original total current signal V Iac+ V Idc Subtraction yields another voltage signal V. Idc It is directly superimposed on the negative terminal of the comparator, and compared with the corrected reference voltage V. REF_NEW A comparison was made. This current-mode control structure maintains a fast dynamic response while avoiding the modulation lag problem of fixed-frequency mode. Its control process is as follows:

[0045] Step 1: Separate the DC portion of the total inductor current through filtering. The total inductor current signal is obtained by superimposing the inductor currents of all phases in the multiphase Buck converter. This total inductor current signal is then converted into a proportional voltage signal using a current mirror and resistors. One of these voltage signals is then filtered to extract the AC portion, V. Iac Then subtract the AC component V from the total inductor current signal. Iac The DC component V of the total inductor current signal is obtained.Idc .

[0046] Step 2, provide the reference signal V REF A ramp signal is superimposed. Because the phases of the multiphase Buck converter are interleaved and connected in parallel, the total inductor current ripple is reduced due to cancellation. Therefore, a ramp compensation signal of a certain amplitude needs to be superimposed to improve the stability of the loop.

[0047] Step 3: The positive and negative signals are output as a control signal VTR by a comparator to the PWM generator, which generates the switching signals for each phase. In steady state, the PWM generator outputs switching signals with a constant on-time according to the control signal VTR. If the high-level duration of the control signal VTR exceeds a preset value, it indicates that the converter has entered a transient state: if no voltage adjustment command is received, it indicates a load switching transient state, generating switching signals with a preset transient on-time; if a voltage adjustment command is received, it indicates a dynamic voltage regulation transient state.

[0048] This invention also discloses a fast dynamic voltage regulation method for a multiphase BUCK converter, comprising: assuming an upward voltage adjustment is required, the switching signals of each phase, regardless of whether they are in the on or off state, are immediately pulled high; first, a certain period of constant conduction is maintained for charging; then, a certain period of constant off is maintained for discharging until the output voltage transition is complete. To shorten the transient transition time and reduce output voltage overshoot, a Time-Optimal Control (TOC) algorithm is employed, resulting in a smooth output voltage transition without overshoot. This TOC algorithm is used to solve for the optimal conduction time T in real time. on and shutdown time T off .

[0049] like Figure 3 As shown, during dynamic voltage regulation, the control module determines in real time whether to adjust the voltage upwards or downwards based on the direction of change in the input and output voltages. When a rise in the reference voltage is detected, the multiphase buck circuit immediately issues a command to each phase switch to extend the on-time, causing the inductor current to rise rapidly and charge the output capacitor; when the output voltage approaches the target value, the off-time T is maintained. off This allows the capacitor voltage to transition naturally to the new steady-state value. Conversely, when the reference voltage drops, the off-time T is maintained initially. off Discharge occurs, then the conduction phase begins, and the conduction time is maintained for T. on This is to achieve a smooth voltage drop.

[0050] Specifically, the system first constrains the rate of change of the output voltage to zero at the transition start and end points using boundary conditions, thus ensuring a smooth and oscillating voltage regulation process. Then, through energy conservation and the dynamic balance relationship between inductor and capacitor, it derives the unique corresponding on and off times. These times are related to the input voltage, the target output voltage, and circuit parameters (inductor and capacitor values), and can be calculated instantly by the digital control module after each voltage regulation command is triggered. Figure 4 As shown, V O1 The initial voltage before voltage regulation, V O2 The steady-state voltage is implemented using the following principle:

[0051] For the total output capacitance of a multiphase Buck converter, its output voltage The current satisfies:

[0052] (1)

[0053] Taking the differential twice on both sides of equation (1), we get:

[0054] (2)

[0055] Assuming the load current of the multiphase Buck converter remains constant during dynamic voltage regulation, it can be concluded that the current across the total inductance L of the multiphase Buck converter is the same as the current across the total capacitance C, i.e.:

[0056] (3)

[0057] When 0 <t<t SW At that time, t SW This indicates the start of transient voltage regulation. Since it is in the conduction phase at this time, the inductor current of the multiphase Buck converter is related to the input voltage. Output voltage The relationship is:

[0058] (4)

[0059] When t SW <t<t S At that time, t S The time required to complete the voltage regulation action is during the off phase, and the inductor current and output voltage of the multiphase Buck converter are related. The relationship is:

[0060] (5)

[0061] Substituting formulas (4) and (5) into formula (2) respectively, we get:

[0062] (6)

[0063] (7)

[0064] Under the Time-Optimal Control (TOC) strategy, it is desirable for the output voltage to transition smoothly without overshoot, and ripple to be negligible, i.e., satisfying the following:

[0065] (8)

[0066] Combined with initial conditions 𝑉 O (0)=𝑉 𝑜1 , 𝑉 O (𝑡𝑠)=𝑉 𝑜2 And formula (8) can be used to solve formulas (6) and (7):

[0067] (9)

[0068] (10)

[0069] From the continuity of the function, we know that at t=t SW There are:

[0070] (11)

[0071] (12)

[0072] By combining formulas (11) and (12), the switching point 𝑡 can be calculated. 𝑠𝑤 The output voltage at that point is:

[0073] (13)

[0074] = n 𝑠𝑤 Substituting into formula (9) and combining with formula (13), we obtain the constant conduction time:

[0075] (14)

[0076] = n 𝑠𝑤 Substituting into formula (10) and combining it with formula (13), we obtain the constant turn-off time:

[0077] (15)

[0078] Based on formulas (14) and (15), the optimal conduction time T is solved in real time using the time-optimal control algorithm. on and shutdown time T off .

[0079] In a multiphase Buck structure, the equivalent inductance of the system is reduced because the inductors of each phase are connected in parallel. Therefore, this invention modifies the optimal time parameter so that it can automatically adapt to the equivalent dynamic response characteristics of different phase number configurations.

[0080] Figure 5 This is a waveform diagram of the fast dynamic voltage regulation algorithm of the present invention. When a change in the reference voltage is detected, the digital control module initiates a dynamic voltage regulation strategy based on Time-Optimal Control (TOC). The system first determines the direction of voltage regulation; if the reference voltage rises, the conduction time T of each phase PWM is simultaneously extended. on This causes the inductor current to rise rapidly and charges the output capacitor; if the reference voltage drops, the off-time T is extended. off The inductor current decreases to achieve discharge. The control module calculates the optimal T in real time based on the energy balance equation of inductor current and capacitor voltage. on With T off This algorithm enables the output voltage to transition smoothly and without overshoot in the shortest possible time. It balances speed and stability, significantly outperforming traditional stepped DVS regulation.

[0081] Figure 6 and Figure 7 The simulation results compare the dynamic voltage regulation of this invention with those of traditional voltage regulation methods. Under the same circuit conditions, this invention can complete the voltage adjustment process from 1V to 1.5V within 10μs without significant overshoot; while the transition time of the traditional step-by-step adjustment method is approximately 30μs, accompanied by significant voltage overshoot. The simulation results show that the fast dynamic voltage regulation algorithm of this invention has significant advantages in both voltage regulation speed and voltage stability.

[0082] The entire control process of this invention can be summarized as follows: After system startup, it first enters a soft-start phase, gradually increasing the output voltage to prevent surges; when steady state is reached, the PI self-calibration loop is activated for error correction; when a voltage regulation command or load change is detected, calibration is automatically paused and the system enters TOC dynamic voltage regulation mode to achieve a rapid and smooth voltage transition. The system is implemented on an FPGA platform with a control clock of 250MHz, achieving a voltage regulation accuracy better than 0.3%. In a 550A→660A load switching test, the output ripple is less than ±10mV, fully verifying the excellent performance of this invention.

[0083] A computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the fast dynamic voltage regulation method of the present invention. The processor contains a kernel that retrieves the corresponding program unit from memory.

[0084] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed, it implements the steps of the fast dynamic voltage regulation method of the present invention.

[0085] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0086] A computer program product includes a computer program / instructions that, when executed by a processor, implement the steps of the fast dynamic voltage regulation method of the present invention.

[0087] It is understood that this invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, modifications can be made to these features and embodiments under the teachings of this invention to adapt to specific circumstances and materials, all of which fall within the protection scope of this invention.

Claims

1. A fast dynamic voltage regulation method based on a self-calibrating multiphase Buck circuit, wherein, The self-calibrating multiphase Buck circuit consists of a Buck main control loop, a current sampling module, a voltage sampling module, a digital control module, and a PWM generation module. The output of the Buck main control circuit is connected to the input of the current sampling module, and the input is connected to the PWM generation module; it includes a multiphase Buck main topology circuit and a ramp voltage generator. The input terminal of the current sampling module is connected to the output terminal of the Buck main control circuit, and the output terminal is connected to the digital control module to acquire the inductor current of each phase and generate the total current signal. The input terminal of the voltage sampling module is connected to the output terminal of the Buck main control circuit, and the output terminal is connected to the digital control module. It is used to sample the output voltage using an ADC and send it to the digital control module. The input terminal of the digital control module is connected to the output terminals of the current sampling module and the voltage sampling module, and the output terminal is connected to the PWM generation module; it includes a fast dynamic voltage regulation unit and a DC deviation self-calibration unit. The input terminal of the PWM generation module is connected to the output terminal of the digital control module, and the output terminal is connected to the Buck main control circuit; it is used to output the PWM drive waveform of each phase according to the control signal VTR generated by the digital control module. Its features include the following steps: S1 converts the total inductor current signal obtained by superimposing the inductor currents of all phases into a proportional voltage signal through a current mirror and a resistor; one voltage signal is then filtered to extract the AC component V. Iac By comparing with the original total current signal V Iac+ V Idc Subtraction yields another voltage signal V. Idc Superimposed onto the negative terminal of the comparator; S2, provide the reference signal V REF By superimposing a ramp signal, the corrected reference voltage V is obtained. REF_NEW ; S3, the corrected reference voltage V REF_NEW The positive and negative terminals serve as inputs to the comparator, which outputs the control signal VTR to the PWM generation module to obtain the switching signals for each phase. In steady state, the PWM generation module outputs switching signals with a constant on-time according to the control signal VTR. If the high-level duration of the control signal VTR exceeds a preset value, it indicates that the converter has entered a transient state: if no voltage adjustment command is received, it indicates that the converter has entered a load switching transient state, and a switching signal is generated with a preset transient on-time; if a voltage adjustment command is received, it indicates that the converter has entered a dynamic voltage regulation transient state.

2. The fast dynamic voltage regulation method based on a self-calibrating multiphase Buck circuit according to claim 1, characterized in that, During dynamic voltage regulation, the control module determines in real time whether to adjust the voltage upwards or downwards based on the direction of change in the input and output voltages, and uses a time-optimal control algorithm to solve for the optimal conduction time T in real time. on and shutdown time T off This ensures a smooth output voltage transition without overshoot.

3. The fast dynamic voltage regulation method based on a self-calibrating multiphase Buck circuit according to claim 2, characterized in that, When a rise in the reference voltage is detected, the multiphase Buck circuit immediately issues an instruction to each phase switch to extend the on-time, causing the inductor current to rise rapidly and charging the output capacitor; once the output voltage approaches the target value, the off-time T is maintained. off This allows the capacitor voltage to naturally transition to a new steady-state value. When a drop in the reference voltage is detected, the off-time T is maintained. off Discharge occurs, then the conduction phase begins, and the conduction time is maintained for T. on This is to achieve a smooth voltage drop.

4. The fast dynamic voltage regulation method based on a self-calibrating multiphase Buck circuit according to claim 2, characterized in that, The implementation of the time-optimal control algorithm is as follows: First, the rate of change of the output voltage at the transition start and end points is constrained to zero by boundary conditions; Then, by applying the law of conservation of energy and the dynamic balance between inductance and capacitance, the unique corresponding conduction time T can be derived. on Or shutdown time T off On-time T on Or shutdown time T off The expression is calculated by the digital control module immediately after each voltage regulation command is triggered, as follows: ， ， Where L is the total inductance of the multiphase Buck converter, and C is the total capacitance of the multiphase Buck converter; V O1 V is the initial voltage before voltage regulation. O2 For steady-state voltage, V in This is the input voltage of the multiphase Buck converter.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1 to 4.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is executed, it implements the steps of the method as described in any one of claims 1 to 4.

7. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method according to any one of claims 1 to 4.

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