A power supply control system and method, power supply

Abstract

The application provides a power supply control system and method, and a power supply, and relates to the technical field of power electronics. The system comprises: a sampling feedback module for obtaining an operating parameter feedback signal of a main circuit of the power supply; a digital control module for generating an analog reference signal according to a target output parameter and the output parameter feedback signal; an analog control module comprising an output parameter outer loop, an inductance current middle loop and a peak current inner loop, for generating a wave generation control signal according to the analog reference signal and the operating parameter feedback signal; and a drive signal generation module for generating a drive signal for controlling a power switch tube in the main circuit of the power supply according to the wave generation control signal. The application can take into account the control flexibility, output precision, low output ripple, dynamic response performance and current limiting protection reliability of the power supply.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and more specifically, to a power supply control system and method, and a power supply. Background Technology

[0002] As applications such as precision instruments, electronic testing equipment, and communication equipment place increasing demands on power quality, DC power supplies need to simultaneously possess high output accuracy, low output ripple, and good dynamic response capabilities. Furthermore, under different application scenarios, DC power supplies also require good flexibility in setting target parameters and reliable current-limiting protection capabilities.

[0003] In existing high-precision DC power supply control schemes, the power supply control method mainly adopts digital control or analog control. Digital control has advantages such as flexible control logic, strong parameter adjustability, and easy target parameter setting. However, due to factors such as sampling, calculation, and control signal update cycles, the response speed is relatively limited when the load changes rapidly or the current fluctuates rapidly, making it difficult to suppress transient current fluctuations in a timely manner. Analog control has advantages such as fast response speed and good ripple suppression effect. However, its parameter adjustment flexibility is relatively poor, and the control accuracy is easily affected by factors such as device deviation and temperature drift. At the same time, power supply output regulation is usually achieved through closed-loop control such as voltage loop, current loop, inductor current loop, or peak current loop. However, in some multi-closed-loop control schemes, the coordination between different closed loops is insufficient. Voltage regulation, current regulation, and current limiting protection may affect each other, leading to problems such as overshoot, oscillation, response lag, or increased output ripple during load changes, input disturbances, or output regulation. Summary of the Invention

[0004] The problem solved by this invention is: how to balance the power supply's control flexibility, output accuracy, low output ripple, dynamic response performance, and current limiting protection reliability.

[0005] To address the above problems, the present invention provides a power control system and method, and a power supply.

[0006] In a first aspect, the present invention provides a power supply control system, characterized in that it comprises: The sampling feedback module is used to acquire the operating parameter feedback signals of the main power supply circuit; the operating parameter feedback signals include output parameter feedback signals, inductor current feedback signals, and switch current sampling signals. A digital control module is used to generate an analog reference signal based on the target output parameters and the feedback signal of the output parameters; An analog control module includes an outer loop of output parameters, a middle loop of inductor current, and an inner loop of peak current. The outer loop of output parameters is used to generate an inductor current reference signal based on the analog reference signal and the output parameter feedback signal. The middle loop of inductor current is used to generate a peak current control reference signal based on the inductor current reference signal and the inductor current feedback signal. The inner loop of peak current is used to generate a waveform control signal based on the peak current control reference signal and the switching current sampling signal. A drive signal generation module is used to generate a drive signal for controlling the power switching transistors in the main power supply circuit based on the wave generation control signal. The inductor current loop has a first adjustment state and a second adjustment state; the inductor current loop is configured to switch between the first adjustment state and the second adjustment state according to the change characteristics of the current error signal between the inductor current reference signal and the inductor current feedback signal; the integral adjustment effect of the inductor current loop in the first adjustment state is less than the integral adjustment effect in the second adjustment state.

[0007] Optionally, the output parameter feedback signal includes at least one of an output voltage feedback signal and an output current feedback signal; the target output parameter includes at least one of a target output voltage, a target output current, and a target output power. The digital control module is used to generate the analog reference signal based on the target output voltage and the output voltage feedback signal in constant voltage mode, based on the target output current and the output current feedback signal in constant current mode, and based on the target output power and the actual output power in constant power mode; wherein the actual output power is determined based on the output voltage feedback signal and the output current feedback signal.

[0008] Optionally, the digital control module includes a digital error calculation unit, a digital adjustment unit, a calibration unit, and a digital-to-analog conversion unit; The digital error calculation unit is used to determine the digital error signal based on the target output parameter and the output parameter feedback signal; The digital adjustment unit is used to adjust the digital error signal to obtain a digital adjustment signal; The calibration unit is used to generate a calibration signal based on the calibration coefficient; The digital-to-analog conversion unit is used to generate the analog reference signal based on the digital adjustment signal and the calibration signal.

[0009] Optionally, the output parameter feedback signal includes an output voltage feedback signal and an output current feedback signal; the output parameter outer loop includes a voltage outer loop, a current outer loop, and an outer loop signal processing unit; The outer voltage loop is used to generate a voltage regulation signal based on the analog reference signal and the output voltage feedback signal; The outer current loop is used to generate a current adjustment signal based on the current reference signal and the output current feedback signal; wherein, the current reference signal is determined based on the analog reference signal or the target output parameter; The outer loop signal processing unit is used to generate the inductor current reference signal based on the voltage adjustment signal and / or the current adjustment signal.

[0010] Optionally, the variation characteristics of the current error signal include at least one of the rate of change, amplitude variation, and duration of the current error signal.

[0011] Optionally, the inductor current loop includes a proportional regulation branch and an integral regulation branch; In the first adjustment state, the proportional adjustment branch participates in generating the peak current control reference signal, and the integral adjustment branch does not participate or participates in generating the peak current control reference signal to a first degree. In the second adjustment state, both the proportional adjustment branch and the integral adjustment branch participate in generating the peak current control reference signal, and the integral adjustment branch participates in generating the peak current control reference signal with a second degree of action. The degree of effect of the second action is greater than that of the first action.

[0012] Optionally, the peak current inner loop includes a peak current control unit, which is used to compare the peak current control reference signal and the switching current sampling signal in each switching cycle, and generate the wave generation control signal when the switching current sampling signal reaches or exceeds a peak current threshold determined by the peak current control reference signal.

[0013] Optionally, the peak current inner loop further includes a slope compensation unit, which is used to superimpose a slope compensation signal onto the switching current sampling signal; The slope compensation unit is configured to generate a slope compensation signal with a first compensation amount within a first duty cycle range, and to generate a slope compensation signal with a second compensation amount within a second duty cycle range; wherein the duty cycle corresponding to the second duty cycle range is greater than the duty cycle corresponding to the first duty cycle range, and the second compensation amount is greater than the first compensation amount.

[0014] In a second aspect, the present invention also provides a power supply, including a power supply main circuit and a power supply control system as described in the first aspect.

[0015] Thirdly, the present invention also provides a power supply control method, comprising: Obtain operating parameter feedback signals of the main power supply circuit; the operating parameter feedback signals include output parameter feedback signals, inductor current feedback signals, and switch current sampling signals; A simulated reference signal is generated based on the target output parameters and the feedback signal of the output parameters; Based on the analog reference signal and the output parameter feedback signal, an inductor current reference signal is generated through the outer loop of the output parameters; Based on the inductor current reference signal and the inductor current feedback signal, a peak current control reference signal is generated through the inductor current loop. Based on the peak current control reference signal and the switching current sampling signal, a wave generation control signal is generated through the peak current inner loop; The power supply main circuit generates drive signals to control the power switching transistors based on the wave generation control signal. The process of generating a peak current control reference signal through the inductor current loop includes: switching between a first adjustment state and a second adjustment state of the inductor current loop based on the variation characteristics of the current error signal between the inductor current reference signal and the inductor current feedback signal; the integral adjustment effect of the inductor current loop in the first adjustment state is less than the integral adjustment effect in the second adjustment state.

[0016] The beneficial effects of the power supply control system and method of the present invention are as follows: The power supply control system of the present invention generates an analog reference signal based on the target output parameters and the output parameter feedback signal through a digital control module. It leverages the advantages of digital control, such as ease of target setting, mode switching, and deviation adjustment, to improve the flexibility of target output parameter setting and the accuracy of steady-state control. By generating control signals step-by-step through the output parameter outer loop, inductor current middle loop, and peak current inner loop in the analog control module, output parameter adjustment, inductor current tracking, and switching current limiting can be completed in their respective closed loops, reducing mutual interference between these functions and improving the synergy of multi-loop control. Specifically, the output parameter outer loop converts the adjustment requirements of output voltage, output current, or output power into an inductor current reference signal, and the inductor current middle loop makes the actual inductor current follow the changes in the inductor current reference signal. Since inductor current fluctuations affect energy transfer on the output side and the charging and discharging state of the output capacitor, suppressing inductor current fluctuations through the inductor current middle loop helps reduce output ripple. By switching between the first and second regulation states based on the changing characteristics of the current error signal in the inductor current loop, the impact of integral regulation on transient response can be reduced during the dynamic regulation phase, improving loop response speed. Furthermore, in the steady-state phase, the steady-state error suppression capability is enhanced, thus balancing dynamic response and output accuracy. The peak current inner loop generates a waveform control signal based on the peak current control reference signal and the switching current sampling signal. This signal is then driven by the drive signal generation module, allowing the switching current state to directly participate in waveform control. This achieves cycle-by-cycle current constraint, improving the reliability of current limiting protection for the power switching transistor and the main power supply circuit. Therefore, the power supply control system can improve power output accuracy, reduce output ripple, enhance dynamic response performance, and improve the reliability of current limiting protection for the main power supply circuit while maintaining the flexibility of digital control and the speed of analog control. Attached Figure Description

[0017] Figure 1 This is a structural block diagram of a power control system in an embodiment of the present invention; Figure 2 This is a structural block diagram of a power control system in an embodiment of the present invention; Figure 3 This is a schematic diagram of the circuit structure of the inductor current loop in an embodiment of the present invention; Figure 4 This is a schematic diagram of the circuit structure of the peak current inner loop in an embodiment of the present invention; Figure 5 This is a schematic diagram of the circuit structure of the main power supply circuit in an embodiment of the present invention. Detailed Implementation

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0020] Combination Figure 1 As shown, an embodiment of the present invention provides a power control system, including: The sampling feedback module is used to acquire the operating parameter feedback signals of the main power supply circuit; the operating parameter feedback signals include the output parameter feedback signal, the inductor current feedback signal, and the switch current sampling signal. The digital control module is used to generate analog reference signals based on the target output parameters and the output parameter feedback signals; The analog control module includes an outer loop of output parameters, a middle loop of inductor current, and an inner loop of peak current. The outer loop of output parameters is used to generate an inductor current reference signal based on the analog reference signal and the output parameter feedback signal. The middle loop of inductor current is used to generate a peak current control reference signal based on the inductor current reference signal and the inductor current feedback signal. The inner loop of peak current is used to generate a wave generation control signal based on the peak current control reference signal and the switching current sampling signal. A drive signal generation module is used to generate drive signals for controlling the power switching transistors in the main power supply circuit based on the wave generation control signal. The inductor current loop has a first adjustment state and a second adjustment state. The inductor current loop is configured to switch between the first adjustment state and the second adjustment state based on the changing characteristics of the current error signal between the inductor current reference signal and the inductor current feedback signal. The integral adjustment effect of the inductor current loop in the first adjustment state is less than that in the second adjustment state.

[0021] This embodiment provides a power supply control system. This power supply control system can be applied to DC power supply devices (hereinafter referred to as power supplies) that have high requirements for power supply accuracy and output ripple, such as precision instruments, electronic testing equipment, semiconductor testing equipment, communication equipment, and charging equipment. Specifically, the power supply includes a power supply control system and a main power supply circuit. The power supply control system performs multi-loop control on the main power supply circuit to ensure stable output according to target output parameters. The main power supply circuit includes a power switching transistor and an energy conversion circuit that works in conjunction with the power switching transistor. The energy conversion circuit performs energy conversion, rectification, filtering, or energy storage under the switching action of the power switching transistor. The power switching transistor is turned on or off under the drive signal output by the power supply control system, thereby regulating the energy transfer and output states of the main power supply circuit. Multi-loop control refers to a power supply control system forming multiple coordinated closed-loop adjustment processes based on feedback signals of different operating parameters of the main power supply circuit. For example, multi-loop control can include output parameter closed-loop adjustment based on output parameter feedback signals, inductor current closed-loop adjustment based on inductor current feedback signals, and peak current closed-loop adjustment based on switch current sampling signals. Moreover, each closed-loop adjustment is not isolated from the others, but is interconnected by generating control reference signals step by step, so that output parameter adjustment, inductor current tracking, and switch current limiting are completed in their respective closed loops, thereby improving the coordination of the power supply control system.

[0022] To achieve the aforementioned multi-closed-loop control, the power supply control system includes a sampling feedback module, a digital control module, an analog control module, and a drive signal generation module. The sampling feedback module acquires the operating parameter feedback signals of the main power supply circuit; the digital control module generates an analog reference signal based on the target output parameter and the output parameter feedback signal from the operating parameter feedback signal; the analog control module generates a wave generation control signal based on the analog reference signal and the operating parameter feedback signal; and the drive signal generation module generates a drive signal for controlling the power switching transistor based on the wave generation control signal.

[0023] The analog control module includes an outer loop for output parameters, a middle loop for inductor current, and an inner loop for peak current. The outer loop for output parameters forms a closed-loop regulation of the output parameters, the middle loop for inductor current forms a closed-loop regulation of the inductor current, and the inner loop for peak current forms a closed-loop regulation of the peak current. Specifically, the digital control module generates an analog reference signal based on the target output parameters and the output parameter feedback signal; the outer loop for output parameters generates an inductor current reference signal based on the analog reference signal and the output parameter feedback signal; the middle loop for inductor current generates a peak current control reference signal based on the inductor current reference signal and the inductor current feedback signal; the inner loop for peak current generates a wave generation control signal based on the peak current control reference signal and the switching current sampling signal; and the drive signal generation module generates a drive signal based on the wave generation control signal. Thus, the power supply control system achieves multi-closed-loop control of the main power supply circuit through a step-by-step signal transmission from the digital control module to the outer loop for output parameters, the middle loop for inductor current, the inner loop for peak current, and the drive signal generation module.

[0024] The sampling feedback module, digital control module, analog control module, and drive signal generation module will be further explained below.

[0025] The sampling feedback module is used to acquire operating parameter feedback signals of the main power supply circuit. These operating parameter feedback signals include output parameter feedback signals, inductor current feedback signals, and switching current sampling signals. Output parameter feedback signals characterize the actual output state of the main power supply circuit; for example, they may include output voltage feedback signals and / or output current feedback signals. When power control is required, the actual output power or power feedback amount can also be determined based on the output voltage feedback signals and output current feedback signals. Inductor current feedback signals characterize the actual current state of the inductive energy storage branch in the main power supply circuit; the inductive energy storage branch can be the branch containing the output inductor in the main power supply circuit, or other inductor branches used for inductive energy storage and release. Switching current sampling signals characterize the instantaneous current state of the switching branch containing the power switch; for example, they can be the sampled current signal flowing through the power switch or its branch during the power switch's conduction period.

[0026] The digital control module (DCMB) generates an analog reference signal based on the target output parameters and the output parameter feedback signal. The target output parameters are the desired output control objectives of the power supply, such as target output voltage, target output current, or target output power. The analog reference signal serves as the upper-level setpoint signal for the analog control module, characterizing the analog control objective determined by the DCMB based on the current output deviation. Specifically, the DCMB generates a corresponding control quantity based on the deviation between the target output parameters and the actual output state characterized by the output parameter feedback signal, and obtains the analog reference signal based on this control quantity. Thus, the DCMB can perform target setting, output deviation adjustment, and steady-state accuracy control functions. Therefore, generating an analog reference signal through the DCMB improves the flexibility of target output parameter setting, control mode switching, and calibration adjustment.

[0027] The analog control module performs closed-loop regulation based on analog reference signals and real-time feedback signals such as output parameter feedback signals, inductor current feedback signals, and switch current sampling signals. Therefore, it is beneficial to improve the response speed of the power supply control system to load changes, output changes, and current changes.

[0028] The outer loop of the output parameters is used to generate an inductor current reference signal based on the analog reference signal and the output parameter feedback signal. The inductor current reference signal is an intermediate current target determined by the outer loop based on the analog reference signal and the output parameter feedback signal. In other words, the outer loop does not directly control the power switch; instead, it converts the adjustment requirements for output voltage, output current, or output power into adjustment requirements for the inductive energy storage branch current in the main power supply circuit, and outputs this as an inductor current reference signal to the middle loop. By setting the inductor current reference signal, the output parameter adjustment and inductor current adjustment can be cascaded, thereby improving the power supply's response to load changes, input disturbances, or mode switching.

[0029] The inductor current intermediate loop is used to generate a peak current control reference signal based on the inductor current reference signal and the inductor current feedback signal. Specifically, the inductor current intermediate loop generates a current error signal based on the difference between the inductor current reference signal and the inductor current feedback signal, and then generates the peak current control reference signal based on this current error signal. The peak current control reference signal is used as the current control target of the peak current inner loop to limit or adjust the current control level of the peak current inner loop in the current control cycle. Therefore, the inductor current intermediate loop enables the actual inductor current to follow the changes in the inductor current reference signal, thereby improving the response capability of the power supply main circuit to output changes.

[0030] Furthermore, since the current fluctuations in the inductive energy storage branch of the power supply main circuit affect the energy transfer process on the output side and the charging and discharging state of the output capacitor, which in turn affects the magnitude of the output voltage or current ripple, the influence of inductor current fluctuations on output parameters can be suppressed by making the actual inductor current follow the inductor current reference signal through the inductor current loop, thereby helping to reduce the output ripple of the power supply main circuit.

[0031] The peak current inner loop generates a waveform control signal based on the peak current control reference signal and the switching current sampling signal. The switching current sampling signal characterizes the instantaneous current in the switching branch where the power switch is located. The peak current inner loop generates the waveform control signal based on the relationship between the peak current control reference signal and the switching current sampling signal. The waveform control signal characterizes the switching control requirements of the power switch, such as determining the power switch's on / off, turn-off time, or duty cycle changes. By incorporating the switching current sampling signal into the peak current inner loop control, the on / off state of the power switch can be constrained by the instantaneous current state of the switching branch, thereby achieving rapid current regulation and cycle-by-cycle current limiting protection.

[0032] The drive signal generation module generates drive signals for controlling the power switching transistors in the main power supply circuit based on the waveform control signal. After the drive signal is applied to the power switching transistors, the energy transfer state of the main power supply circuit changes accordingly, causing changes in the output parameters, inductor current, and switching current of the main power supply circuit. The changed operating parameter feedback signals are then acquired by the sampling feedback module and fed back to the digital control module and analog control module according to the corresponding closed-loop control requirements, thus forming a complete closed-loop control process.

[0033] Therefore, a hierarchical control relationship is formed between the digital control module, the outer loop of output parameters, the middle loop of inductor current, and the inner loop of peak current in the power supply control system. Specifically, the digital control module generates an analog reference signal based on the target output parameters and the output parameter feedback signal; the outer loop of output parameters generates an inductor current reference signal based on the analog reference signal and the output parameter feedback signal; the middle loop of inductor current generates a peak current control reference signal based on the inductor current reference signal and the inductor current feedback signal; and the inner loop of peak current generates a wave generation control signal based on the peak current control reference signal and the switching current sampling signal. In this way, output parameter adjustment, inductor current adjustment, and switching current limiting are completed in closed loops at different levels. Each closed loop has a clear control object and signal transmission relationship, which helps to reduce mutual interference between output parameter adjustment, inductor current tracking, and switching current limiting.

[0034] Furthermore, the inductor current loop has a first regulation state and a second regulation state. The inductor current loop is configured to switch between the first and second regulation states based on the changing characteristics of the current error signal between the inductor current reference signal and the inductor current feedback signal. The current error signal is the deviation signal between the inductor current reference signal and the inductor current feedback signal; the changing characteristics of the current error signal reflect changes in the inductor current regulation demand, such as the amplitude, rate, direction, or duration of the change. For example, when the amplitude or rate of change of the current error signal is large, or when the current error signal continuously deviates from a preset range within a preset time, the inductor current regulation demand is considered large or changing rapidly. When the changing characteristics of the current error signal indicate a large or rapid inductor current regulation demand, the main power supply circuit may be undergoing load changes, output regulation, input disturbances, or other dynamic adjustment processes. In this case, the inductor current loop operates in the first regulation state. Because the integral regulation effect of the inductor current intermediate loop is smaller in the first regulation state than in the second regulation state, it can reduce the impact of integral regulation on the loop's transient response in the first regulation state. This allows the loop to respond more quickly to changes in the inductor current reference signal, thus reducing the possibility of response lag, overshoot, or oscillation when the load changes abruptly or the output state changes. When the characteristics of the current error signal indicate that the inductor current regulation demand decreases or tends to stabilize, the inductor current regulation gradually enters a relatively stable stage. In this case, the inductor current intermediate loop operates in the second regulation state. Because the integral regulation effect of the inductor current intermediate loop is greater in the second regulation state than in the first regulation state, it can enhance the suppression of steady-state error in the second regulation state. This helps reduce the steady-state deviation between the inductor current reference signal and the inductor current feedback signal, enabling the power supply main circuit to maintain high control accuracy during stable operation. Therefore, by switching the inductor current loop between the first and second adjustment states according to the changing characteristics of the current error signal, and by making the integral adjustment effect in the first adjustment state smaller than that in the second adjustment state, the inductor current loop can focus more on the loop response speed in the dynamic adjustment stage and more on the steady-state error suppression capability in the steady-state adjustment stage, thus taking into account both dynamic response and steady-state accuracy.

[0035] In summary, the power supply control system generates analog reference signals based on the target output parameters and output parameter feedback signals through the digital control module. This leverages the advantages of digital control, such as ease of target setting, mode switching, and deviation adjustment, to improve the flexibility of target output parameter setting and the accuracy of steady-state control. By generating control signals sequentially through the outer loop of output parameters, the middle loop of inductor current, and the inner loop of peak current in the analog control module, output parameter adjustment, inductor current tracking, and switching current limiting can be completed in their respective closed loops. This reduces mutual interference between these processes and improves the synergy of multi-loop control. Specifically, the outer loop of output parameters converts the adjustment requirements of output voltage, output current, or output power into an inductor current reference signal, while the middle loop of inductor current ensures that the actual inductor current follows the changes in the inductor current reference signal. Since inductor current fluctuations affect energy transfer on the output side and the charging and discharging state of the output capacitor, suppressing inductor current fluctuations through the middle loop helps reduce output ripple. By switching between the first and second regulation states based on the changing characteristics of the current error signal in the inductor current loop, the impact of integral regulation on transient response can be reduced during the dynamic regulation phase, improving loop response speed. Furthermore, in the steady-state phase, the steady-state error suppression capability is enhanced, thus balancing dynamic response and output accuracy. The peak current inner loop generates a wave generation control signal based on the peak current control reference signal and the switching current sampling signal. This signal is then driven by the drive signal generation module to drive the power switch. This allows the switching current state to directly participate in wave generation control, achieving cycle-by-cycle current constraint and improving the reliability of current limiting protection for the power switch and the main power supply circuit. Therefore, the power supply control system can improve power output accuracy, reduce output ripple, enhance dynamic response performance, and improve the reliability of current limiting protection in the main power supply circuit while maintaining the flexibility of digital control and the speed of analog control. This achieves a balance between power supply control flexibility, output accuracy, low output ripple, dynamic response performance, and reliable current limiting protection.

[0036] Optionally, the output parameter feedback signal includes at least one of the output voltage feedback signal and the output current feedback signal; the target output parameter includes at least one of the target output voltage, the target output current, and the target output power. The digital control module is used to generate an analog reference signal based on the target output voltage and the output voltage feedback signal in constant voltage mode, based on the target output current and the output current feedback signal in constant current mode, and based on the target output power and the actual output power in constant power mode; wherein, the actual output power is determined based on the output voltage feedback signal and the output current feedback signal.

[0037] In this embodiment, the output parameter feedback signal includes at least one of an output voltage feedback signal and an output current feedback signal. The output voltage feedback signal characterizes the actual output voltage at the output terminal of the power supply's main circuit, and the output current feedback signal characterizes the actual output current at the output terminal of the power supply's main circuit. The target output parameters include at least one of a target output voltage, a target output current, and a target output power. Therefore, the digital control module can select the corresponding target output parameters and output parameter feedback signals to generate an analog reference signal based on the current operating mode of the power supply.

[0038] When the power supply operates in constant voltage mode, the target output parameters include the target output voltage, and the output parameter feedback signal includes the output voltage feedback signal. The digital control module generates an analog reference signal based on the target output voltage and the output voltage feedback signal. Specifically, the digital control module generates a corresponding analog reference signal based on the voltage deviation between the target output voltage and the actual output voltage represented by the output voltage feedback signal. After this analog reference signal is input to the analog control module, the analog control module performs closed-loop control of the power supply main circuit based on the analog reference signal, so that the actual output voltage of the power supply main circuit approaches the target output voltage. Thus, in constant voltage mode, the power supply control system can improve the regulation accuracy and stability of the output voltage.

[0039] When the power supply operates in constant current mode, the target output parameters include the target output current, and the output parameter feedback signal includes the output current feedback signal. The digital control module generates an analog reference signal based on the target output current and the output current feedback signal. Specifically, the digital control module generates a corresponding analog reference signal based on the current deviation between the target output current and the actual output current represented by the output current feedback signal. After this analog reference signal is input to the analog control module, the analog control module performs closed-loop control of the power supply main circuit based on the analog reference signal, so that the actual output current of the power supply main circuit approaches the target output current. Thus, in constant current mode, the power supply control system can improve the regulation accuracy of the output current and reduce the impact of load changes on the stability of the output current.

[0040] When the power supply operates in constant power mode, the target output parameters include the target output power, and the output parameter feedback signals include the output voltage feedback signal and the output current feedback signal. The digital control module generates an analog reference signal based on the target output power and the actual output power. The actual output power is determined based on the output voltage feedback signal and the output current feedback signal. For example, the digital control module can determine the actual output power of the power supply main circuit based on the actual output voltage represented by the output voltage feedback signal and the actual output current represented by the output current feedback signal, and generate an analog reference signal based on the power deviation between the target output power and the actual output power. After this analog reference signal is input to the analog control module, the analog control module performs closed-loop control of the power supply main circuit based on the analog reference signal to make the actual output power of the power supply main circuit approach the target output power. Therefore, in constant power mode, the power supply control system can adjust the control target according to the actual changes in output voltage and output current, improving the stability of constant power output.

[0041] Therefore, the digital control module can generate analog reference signals using corresponding target output parameters and output parameter feedback signals in constant voltage, constant current, and constant power modes, respectively, enabling the same power supply control system to adapt to different output control modes. Furthermore, the analog reference signals generated in different operating modes all serve as the upper-level setpoint signals for the analog control module, ensuring that the outer loop of the output parameters, the middle loop of the inductor current, and the inner loop of the peak current continue to execute control according to a step-by-step closed-loop control relationship. This improves the flexibility of mode switching while also ensuring output accuracy, dynamic response capability, and control stability.

[0042] Optionally, the digital control module includes a digital error calculation unit, a digital adjustment unit, a calibration unit, and a digital-to-analog conversion unit; The digital error calculation unit is used to determine the digital error signal based on the target output parameters and the output parameter feedback signal; The digital adjustment unit is used to adjust the digital error signal to obtain a digital adjustment signal; The calibration unit is used to generate a calibration signal based on the calibration coefficients; The digital-to-analog converter is used to generate an analog reference signal based on the digital adjustment signal and calibration signal.

[0043] In this embodiment, the digital control module includes a digital error calculation unit, a digital adjustment unit, a calibration unit, and a digital-to-analog conversion unit.

[0044] The digital error calculation unit determines the digital error signal based on the target output parameters and the output parameter feedback signal. Specifically, the target output parameters characterize the output control target that the power supply aims to achieve, while the output parameter feedback signal characterizes the actual output state of the power supply's main circuit. The digital error calculation unit compares the target output parameters and the output parameter feedback signal to obtain the deviation between them, and outputs this deviation as the digital error signal. Thus, the digital error signal reflects the degree of deviation of the power supply's current actual output state from the target output state.

[0045] The digital adjustment unit is used to adjust the digital error signal to obtain a digital adjustment signal. Specifically, the digital adjustment unit generates a digital adjustment signal based on the magnitude and changes of the digital error signal. The digital adjustment signal is used to characterize the adjustment amount determined by the digital control module based on the current output deviation. Thus, when the actual output state deviates from the target output state, the digital adjustment unit can adjust the subsequent analog reference signal accordingly based on the digital error signal, causing the output state of the main power supply circuit to change in the direction corresponding to the target output parameters.

[0046] The calibration unit generates a calibration signal based on calibration coefficients. These calibration coefficients can be used to correct control deviations in the digital control module, digital-to-analog converter, or subsequent analog control module caused by factors such as device bias, sampling error, temperature drift, and conversion error. After generating the calibration signal based on the calibration coefficients, the calibration signal participates in the generation process of the analog reference signal, thereby compensating for or correcting the digital adjustment signal. This reduces the impact of system errors on output control accuracy and improves the power supply's output consistency and steady-state accuracy under different operating conditions.

[0047] The digital-to-analog converter (DAC) generates an analog reference signal based on the digital adjustment signal and the calibration signal. Specifically, the DAC receives the digital adjustment signal and the calibration signal, and generates a corresponding analog reference signal based on the adjustment amount represented by the digital adjustment signal and the calibration amount represented by the calibration signal. This analog reference signal is output to the analog control module as the upper-level setpoint signal for the outer loop of the output parameters, enabling the analog control module to perform subsequent closed-loop control based on the digitally adjusted and calibrated control target.

[0048] Thus, a digital control link is formed between the digital error calculation unit, digital adjustment unit, calibration unit, and analog-to-digital conversion unit. The digital error calculation unit determines the deviation between the target output parameter and the actual output state; the digital adjustment unit generates an adjustment amount based on this deviation; the calibration unit generates a calibration signal to correct the control deviation; and the analog-to-digital conversion unit converts the adjustment and calibration results generated on the digital side into an analog reference signal. Therefore, the digital control module can leverage the advantages of digital control in terms of parameter setting and algorithm adjustment, while also improving the accuracy of the analog reference signal through the calibration signal.

[0049] Therefore, by setting up a digital error calculation unit, a digital adjustment unit, a calibration unit, and a digital-to-analog conversion unit in the digital control module, this embodiment can improve the accuracy of the deviation adjustment between the target output parameters and the actual output state, and reduce the influence of device deviation, sampling error, or conversion error on the analog reference signal through calibration signals, thereby improving the steady-state output accuracy and control consistency of the power supply control system.

[0050] Optionally, the digital adjustment unit includes a digital proportional-integral (DI) adjustment unit, which is used to perform proportional-integral adjustment on the digital error signal.

[0051] In this embodiment, the digital adjustment unit includes a digital proportional-integral adjustment unit, which is used to perform proportional-integral adjustment on the digital error signal.

[0052] Specifically, the digital proportional-integral (DII) control unit receives the digital error signal output by the digital error calculation unit and generates a digital control signal based on the digital error signal. The proportional control is used to generate a corresponding control component based on the current magnitude of the digital error signal, thereby improving the response speed of the digital control module to output deviations. The integral control is used to generate a corresponding control component based on the accumulation of the digital error signal over time, thereby reducing or eliminating the steady-state deviation between the target output parameter and the actual output state.

[0053] During power supply operation, when there is a deviation between the actual output state represented by the output parameter feedback signal and the target output parameter, the digital proportional-integral (PI) control unit performs proportional-integral (PI) adjustment based on this deviation, generating a digital adjustment signal to correct the analog reference signal. This digital adjustment signal is then used by the digital-to-analog converter (DAC) to generate the analog reference signal, which is then input to the analog control module. This enables the subsequent analog control module to perform closed-loop control of the power supply main circuit based on the corrected analog reference signal.

[0054] Therefore, by setting a digital proportional-integral (PI) control unit in the digital control unit, the proportional control can be used to improve the response capability of the digital control module to output deviation, and the integral control can be used to improve the steady-state error suppression capability, thereby improving the accuracy and stability of the analog reference signal, and thus improving the steady-state output accuracy of the power control system.

[0055] Optionally, the output parameter feedback signal includes an output voltage feedback signal and an output current feedback signal; the output parameter outer loop includes a voltage outer loop, a current outer loop, and an outer loop signal processing unit; The outer voltage loop is used to generate a voltage regulation signal based on the analog reference signal and the output voltage feedback signal; The outer current loop is used to generate a current regulation signal based on a current reference signal and an output current feedback signal; wherein, the current reference signal is determined based on an analog reference signal or a target output parameter; The outer loop signal processing unit is used to generate an inductor current reference signal based on the voltage regulation signal and / or current regulation signal.

[0056] In this embodiment, the output parameter feedback signals include output voltage feedback signals and output current feedback signals. The output parameter outer loop includes a voltage outer loop, a current outer loop, and an outer loop signal processing unit.

[0057] The outer voltage loop generates a voltage regulation signal based on an analog reference signal and an output voltage feedback signal. Specifically, the output voltage feedback signal characterizes the actual output voltage at the main power supply circuit output, and the analog reference signal serves as the setpoint signal for the outer voltage loop. The outer voltage loop generates the voltage regulation signal based on the deviation between the voltage control target corresponding to the analog reference signal and the actual output voltage characterized by the output voltage feedback signal. The voltage regulation signal characterizes the adjustment amount required by the main power supply circuit to bring the actual output voltage closer to the corresponding voltage control target.

[0058] The outer current loop generates a current regulation signal based on the current reference signal and the output current feedback signal. The output current feedback signal characterizes the actual output current at the main power supply circuit output, while the current reference signal serves as the setpoint for the outer current loop. The current reference signal can be determined based on an analog reference signal or the target output parameters. For example, when the power supply operates in constant current mode or current-limiting control, the current reference signal can be determined by the target output current; when a unified control target needs to be issued by the digital control module, the current reference signal can also be determined by an analog reference signal. The outer current loop generates the current regulation signal based on the deviation between the current control target corresponding to the current reference signal and the actual output current characterized by the output current feedback signal. The current regulation signal characterizes the adjustment amount required by the main power supply circuit to make the actual output current approach the corresponding current control target.

[0059] The outer loop signal processing unit generates an inductor current reference signal based on the voltage regulation signal and / or current regulation signal. Specifically, the outer loop signal processing unit receives the voltage regulation signal output from the voltage outer loop and the current regulation signal output from the current outer loop, and determines the inductor current reference signal to be output to the inductor current middle loop based on the current operating mode of the power supply, output control requirements, or protection control requirements. The inductor current reference signal is used as a setpoint signal for the inductor current middle loop to indicate the current regulation target required for the inductive energy storage branch in the main power supply circuit.

[0060] When constant voltage control is the primary requirement, the outer loop signal processing unit can generate an inductor current reference signal based on the voltage regulation signal. This allows the middle loop of the inductor current control to adjust the energy transfer state of the main power supply circuit according to the inductor current reference signal, thereby making the actual output voltage approach the target voltage. When constant current control or current limiting control is the primary requirement, the outer loop signal processing unit can generate an inductor current reference signal based on the current regulation signal. This allows the middle loop of the inductor current control to limit or regulate the current in the inductive energy storage branch according to the inductor current reference signal, thereby making the actual output current approach the target current or keep it within the allowable range. Under some operating conditions, the voltage regulation signal and the current regulation signal can simultaneously participate in the generation of the inductor current reference signal. For example, when the power supply gradually transitions from a constant voltage state to a current limiting state, or gradually returns from a constant current state to a constant voltage state, the outer loop signal processing unit can jointly determine the inductor current reference signal based on the voltage regulation signal and the current regulation signal to achieve coordination between voltage regulation requirements and current regulation requirements. This reduces the possibility of output overshoot, oscillation, or response lag when switching between constant voltage control and constant current control.

[0061] With the above configuration, the outer loop of the output parameters does not directly generate the control signal for driving the power switch. Instead, it first obtains the voltage regulation requirement and the current regulation requirement through the voltage outer loop and the current outer loop, respectively. Then, the outer loop signal processing unit converts the voltage regulation requirement and / or the current regulation requirement into an inductor current reference signal. In this way, the output parameter regulation requirement can be uniformly mapped to the current setpoint target of the inductor current middle loop, forming a clear cascaded control relationship between the output parameter outer loop and the inductor current middle loop.

[0062] Therefore, by setting up a voltage outer loop, a current outer loop, and an outer loop signal processing unit, this embodiment enables the power supply control system to perform outer loop adjustments for the output voltage and output current respectively, and generate inductor current reference signals according to different operating modes or control requirements, thereby improving the control coordination and output stability during constant voltage control, constant current control, and the switching process between the two.

[0063] Optionally, the outer loop signal processing unit includes a limiting unit and a coupling unit; The limiting unit is used to limit voltage regulation signals and / or current regulation signals; The coupling unit is used to generate an inductor current reference signal based on the voltage regulation signal and / or the current regulation signal after the limiting process.

[0064] In this embodiment, the limiting unit of the outer loop signal processing unit is used to limit the voltage regulation signal and / or current regulation signal. Specifically, the voltage regulation signal is used to characterize the regulation amount generated by the voltage outer loop according to the output voltage regulation requirement, and the current regulation signal is used to characterize the regulation amount generated by the current outer loop according to the output current regulation requirement. Under conditions such as load changes, mode switching, or input disturbances, the voltage regulation signal or current regulation signal may change significantly in a short period of time. If such changes are directly transmitted to the subsequent inductor current middle loop, it may cause a sudden change in the inductor current reference signal, thereby causing inductor current surge, output overshoot, or loop oscillation. Based on this, the limiting unit performs limiting processing on the voltage regulation signal and / or current regulation signal, so that the voltage regulation signal and / or current regulation signal are limited to the corresponding preset signal range. The voltage regulation signal after limiting processing is used to characterize the voltage regulation requirement after limitation, and the current regulation signal after limiting processing is used to characterize the current regulation requirement after limitation. Thus, it is possible to avoid the outer loop regulation signal being too large or changing too quickly, which could cause a surge to the subsequent inductor current middle loop, thereby improving the stability of the multi-loop control process.

[0065] The coupling unit of the outer loop signal processing unit generates an inductor current reference signal based on the voltage regulation signal and / or the current regulation signal after limiting. Specifically, the coupling unit receives the voltage regulation signal and the current regulation signal after limiting, and determines the inductor current reference signal to be output to the inductor current intermediate loop according to the current operating mode of the power supply, output control requirements, or protection control requirements. This inductor current reference signal is used as a setpoint signal for the inductor current intermediate loop, so that the inductor current intermediate loop can perform closed-loop regulation of the inductive energy storage branch current in the main circuit of the power supply according to the setpoint signal.

[0066] For example, when constant voltage control is the primary requirement, the coupling unit can generate an inductor current reference signal based on the voltage regulation signal after limiting, so that the actual output voltage of the power supply main circuit approaches the target voltage. When constant current control or current limiting control is the primary requirement, the coupling unit can generate an inductor current reference signal based on the current regulation signal after limiting, so that the actual output current of the power supply main circuit approaches the target current or remains within the allowable range. When both voltage and current regulation requirements exist, the coupling unit can generate an inductor current reference signal based on both the voltage regulation signal and the current regulation signal after limiting, thereby coordinating the control effects of the voltage outer loop and the current outer loop on the subsequent inductor current middle loop.

[0067] Through the above settings, the limiting unit can suppress excessive changes in the outer loop regulation signal, reducing the impact of the outer loop output on the inductor current intermediate loop; the coupling unit can convert voltage regulation requirements and / or current regulation requirements into a unified inductor current reference signal, enabling a stable and coordinated signal transmission relationship between the output parameter outer loop and the inductor current intermediate loop. Therefore, this embodiment can reduce the possibility of mutual interference between constant voltage control, constant current control, or current limiting control, improve output overshoot, oscillation, and response lag problems during load changes or mode switching, and enhance the dynamic stability and output reliability of the power supply control system.

[0068] Optionally, the variation characteristics of the current error signal include at least one of the rate of change, amplitude change, and duration of the current error signal.

[0069] In this embodiment, the rate of change of the current error signal is used to characterize how quickly the current error signal changes over time. When the rate of change of the current error signal is large, it indicates that the deviation between the inductor current reference signal and the inductor current feedback signal is changing rapidly, and the main power supply circuit may be in a dynamic adjustment process such as load change, input disturbance, or mode switching. In this case, the inductor current loop can switch to the first adjustment state to reduce the impact of integral regulation on transient response and improve the tracking speed of the inductor current loop to changes in the inductor current reference signal.

[0070] The amplitude change of the current error signal is used to characterize the magnitude of the current error signal's change within a preset time range. When the amplitude change of the current error signal is large, it indicates a significant change in the inductor current regulation requirement. If a strong integral regulation is still used, it may lead to excessive integral accumulation, resulting in output overshoot or loop oscillation. Therefore, the inductor current loop can switch to the first regulation state according to the amplitude change, so that the peak current control reference signal mainly responds to the current current error change, thereby improving the response speed and stability during dynamic regulation.

[0071] The duration of the current error signal characterizes how long the current error signal remains in a preset change state or within a preset amplitude range. For example, when the rate of change of the current error signal decreases, the amplitude change decreases, and this continues for a preset time, it indicates that the inductor current regulation process is gradually stabilizing. In this case, the inductor current loop can switch to the second regulation state, allowing the integral regulation branch to participate more significantly in generating the peak current control reference signal, thereby enhancing the ability to suppress steady-state errors.

[0072] In actual control, the inductor current loop can switch states based on any one of the characteristics of the current error signal's rate of change, amplitude change, and duration, or based on a combination of two or three of these characteristics. For example, when the rate of change of the current error signal is greater than a preset rate of change threshold, or the amplitude change is greater than a preset amplitude change threshold, the inductor current loop enters the first adjustment state; when the rate of change of the current error signal is less than a preset rate of change threshold, the amplitude change is less than a preset amplitude change threshold, and this continues for a preset time, the inductor current loop enters the second adjustment state.

[0073] Through the above settings, the inductor current loop can determine the current stage of the inductor current regulation process based on the dynamic changes in the current error signal. When the current error signal changes rapidly or has a large amplitude, the inductor current loop weakens the integral regulation to improve the dynamic response speed; when the current error signal changes slowly and remains stable, the inductor current loop strengthens the integral regulation to reduce steady-state error. This improves the accuracy of the inductor current loop's state switching, enabling the power supply control system to balance transient response performance and steady-state output accuracy.

[0074] Optionally, the change characteristics of the current error signal include the rate of change of the current error signal; when the rate of change of the current error signal is greater than a first preset rate of change threshold, the inductor current loop operates in a first adjustment state; when the rate of change of the current error signal is less than or equal to a second preset rate of change threshold, the inductor current loop operates in a second adjustment state; wherein, the first preset rate of change threshold is greater than or equal to the second preset rate of change threshold.

[0075] In this embodiment, the inductor current loop can switch between a first adjustment state and a second adjustment state based on the rate of change of the current error signal. The current error signal is the deviation signal between the inductor current reference signal and the inductor current feedback signal, and the rate of change of the current error signal characterizes how quickly this deviation signal changes over time. The inductor current loop can periodically acquire the current error signal and determine the rate of change of the current error signal based on the amount of change in the current error signal within adjacent sampling times or a preset time interval. This rate of change can be the absolute value of the rate of change of the current error signal to reflect the speed of change of the current error signal.

[0076] When the rate of change of the current error signal exceeds the first preset rate of change threshold, it indicates that the deviation between the inductor current reference signal and the inductor current feedback signal is changing rapidly. The main power supply circuit may be undergoing dynamic adjustment processes such as load surges, input disturbances, output regulation, or mode switching. At this time, the inductor current loop operates in the first adjustment state. In the first adjustment state, the integral regulation effect of the inductor current loop is relatively small, which reduces the impact of integral accumulation on transient response. This allows the peak current control reference signal to follow the current change of the current error signal more quickly, thereby improving the dynamic response speed of the inductor current loop and reducing the possibility of output overshoot or loop oscillation.

[0077] When the rate of change of the current error signal is less than or equal to the second preset rate of change threshold, it indicates that the deviation between the inductor current reference signal and the inductor current feedback signal is slowing down, and the inductor current regulation process is gradually entering a relatively stable stage. At this time, the inductor current intermediate loop operates in the second regulation state. In the second regulation state, the integral regulation effect of the inductor current intermediate loop is greater, which can enhance the compensation capability for continuous current error, and help reduce the steady-state deviation between the inductor current reference signal and the inductor current feedback signal, thereby improving the steady-state output accuracy of the power supply main circuit.

[0078] Furthermore, the first preset rate of change threshold can be greater than or equal to the second preset rate of change threshold. When the first preset rate of change threshold is greater than the second preset rate of change threshold, within the range where the rate of change of the current error signal is less than or equal to the first preset rate of change threshold and greater than the second preset rate of change threshold, the inductor current loop can maintain its current adjustment state. This creates a switching hysteresis between the first and second adjustment states, preventing frequent switching of the inductor current loop when the rate of change of the current error signal fluctuates near the threshold, thus improving loop control stability.

[0079] In this way, the inductor current loop can use the rate of change of the current error signal as a criterion: when the current error signal changes rapidly, it switches to a first regulation state with a smaller integral regulation effect to improve transient response speed; when the current error signal changes slowly, it switches to a second regulation state with a larger integral regulation effect to improve steady-state error suppression capability. Thus, it achieves switching between the first and second regulation states based on the changing characteristics of the current error signal between the inductor current reference signal and the inductor current feedback signal.

[0080] Optionally, the inductor current loop includes a proportional regulation branch and an integral regulation branch; In the first regulation state, the proportional regulation branch participates in generating the peak current control reference signal, while the integral regulation branch does not participate or participates in generating the peak current control reference signal to a first degree of action. In the second regulation state, both the proportional regulation branch and the integral regulation branch participate in generating the peak current control reference signal, and the integral regulation branch participates in generating the peak current control reference signal with the second degree of action. The degree of the second effect is greater than that of the first effect.

[0081] In this embodiment, the inductor current loop includes a proportional control branch and an integral control branch. The proportional control branch generates a proportional control component based on the current error signal. The current error signal is the deviation signal between the inductor current reference signal and the inductor current feedback signal. The proportional control branch generates a corresponding proportional control component based on the current amplitude of this current error signal. The proportional control component changes quickly with the current error signal, thus improving the response speed of the inductor current loop to changes in the inductor current reference signal. The integral control branch generates an integral control component based on the current error signal. The integral control branch generates a corresponding integral control component based on the accumulation of the current error signal over time. The integral control component can compensate for the persistent current error signal, thus reducing the steady-state deviation between the inductor current reference signal and the inductor current feedback signal.

[0082] In the first regulation state, the proportional control branch participates in generating the peak current control reference signal, while the integral control branch does not participate or participates in generating the peak current control reference signal with a very small initial degree of influence. Specifically, when the changing characteristics of the current error signal indicate that the inductor current regulation demand is large or changes rapidly, the inductor current loop enters the first regulation state. In the first regulation state, the inductor current loop mainly utilizes the rapid response capability of the proportional control branch to the current error signal to generate the peak current control reference signal; simultaneously, the integral control branch does not participate in the generation of the peak current control reference signal, or participates only with a small initial degree of influence. This reduces the impact of integral accumulation on the transient regulation process, avoiding loop response lag, overcompensation, or output overshoot caused by integral regulation during load changes, input disturbances, or mode switching.

[0083] In the second regulation state, both the proportional and integral regulation branches participate in generating the peak current control reference signal, with the integral regulation branch participating with a second degree of influence. This second degree of influence is greater than the first degree of influence. Specifically, when the changing characteristics of the current error signal indicate that the inductor current regulation demand decreases or tends to stabilize, the inductor current loop enters the second regulation state. In this state, the proportional regulation branch continues to provide a proportional regulation component based on the current error signal, while the integral regulation branch provides an integral regulation component with a larger second degree of influence, ensuring that the peak current control reference signal simultaneously incorporates both proportional and integral regulation effects. Therefore, the inductor current loop can enhance its ability to suppress steady-state errors during stable operation, enabling the actual inductor current to more accurately follow the inductor current reference signal.

[0084] For example, the first degree of influence and the second degree of influence can be used to characterize the degree of influence of the integral control branch on the peak current control reference signal. A first degree of influence that is less than the second degree of influence indicates that in the first control state, the integral control component has a weaker influence on the peak current control reference signal; in the second control state, the integral control component has a stronger influence on the peak current control reference signal. The first degree of influence can be zero or a non-zero value less than the second degree of influence. That is, in the first control state, the integral control branch can completely exit loop control or participate in loop control in a weaker manner.

[0085] Through the above settings, the inductor current loop can reduce the integral regulation effect during the dynamic adjustment phase to improve the loop response speed; and enhance the integral regulation effect during the steady-state adjustment phase to reduce steady-state error. Therefore, the inductor current loop can balance transient response capability and steady-state tracking accuracy, thereby improving the control performance of the power supply control system during load changes, mode switching, and stable output processes.

[0086] Optionally, the integral regulation branch includes an integral resistor and an integral capacitor, the integral capacitor being used to charge and discharge according to the current error signal to generate an integral regulation component; The charging and discharging state of the integral capacitor is used to change the degree of influence of the integral regulation component on the peak current control reference signal, so that the integral regulation branch does not participate or participates in the generation of the peak current control reference signal to a first degree in the first regulation state, and participates in the generation of the peak current control reference signal to a second degree in the second regulation state.

[0087] In this embodiment, the integral regulation branch includes an integral resistor and an integral capacitor. The integral capacitor is used to charge and discharge according to the current error signal to form an integral regulation component related to the accumulation of the current error signal. The integral resistor is used in conjunction with the integral capacitor to determine the charging and discharging process of the integral capacitor, thereby affecting the rate of change and the degree of effect of the integral regulation component.

[0088] When the inductor current loop operates in the first regulation state, the charging and discharging state of the integrating capacitor is not yet fully established due to the rapid changes in the current error signal, or the voltage state corresponding to the integrating capacitor changes rapidly with the current error signal, making it difficult to form a stable integral regulation component in a timely manner. In this case, the integral regulation branch does not participate in generating the peak current control reference signal, or only participates in generating the peak current control reference signal with a small initial effect. Therefore, the impact of integral accumulation on the transient regulation process can be reduced, allowing the inductor current loop to respond more quickly to changes in the inductor current reference signal.

[0089] When the inductor current loop operates in the second regulation state, the change in the current error signal tends to stabilize, and the charging and discharging state of the integrating capacitor gradually enters a relatively stable regulation process, enabling the integral regulation branch to form an effective integral regulation component. At this time, the integral regulation branch participates in generating the peak current control reference signal with a second degree of action greater than the first degree of action, thereby compensating for the persistent current error signal and reducing the steady-state deviation between the inductor current reference signal and the inductor current feedback signal.

[0090] With the above settings, the integrating resistor and integrating capacitor can adjust the degree of influence of the integral regulation branch on the peak current control reference signal based on the charging and discharging process of the capacitor. This makes the integral regulation effect of the inductor current loop weaken in the dynamic stage and enhance in the steady-state stage, thus balancing transient response speed and steady-state control accuracy.

[0091] Optionally, the peak current inner loop includes a peak current control unit, which is used to compare the peak current control reference signal and the switching current sampling signal in each switching cycle, and generate a wave generation control signal when the switching current sampling signal reaches or exceeds the peak current threshold determined by the peak current control reference signal.

[0092] In this embodiment, the main power supply circuit includes a power switch transistor, which is a switching device used to control the energy transfer state in the main power supply circuit. The peak current inner loop includes a peak current control unit, which compares the peak current control reference signal and the switching current sampling signal in each switching cycle, and generates a waveform control signal when the switching current sampling signal reaches or exceeds the peak current threshold determined by the peak current control reference signal. The switching cycle refers to the cycle corresponding to one switching control operation of the power switch transistor according to a preset switching frequency, typically including a turn-on phase and a turn-off phase. That is, in each switching cycle, the power switch transistor can complete one turn-on, turn-off, or corresponding duty cycle control process according to the drive signal. The peak current control reference signal is generated by the inductor current middle loop based on the inductor current reference signal and the inductor current feedback signal, and is used to characterize the peak current control target that is allowed or expected to be achieved in the current switching cycle. The switching current sampling signal is used to characterize the instantaneous current of the switching branch where the power switch transistor is located. The peak current control unit determines the corresponding peak current threshold based on the peak current control reference signal and detects and compares the switching current sampling signal in each switching cycle.

[0093] After the start of a switching cycle, the power switch can be turned on under the action of the drive signal. The current in the switching branch changes with the energy transfer process of the main power supply circuit, and the switching current sampling signal changes accordingly. When the switching current sampling signal does not reach the peak current threshold, the peak current control unit does not trigger the waveform control signal due to the peak current limit, and the power switch can continue to operate according to the current waveform control logic. When the switching current sampling signal reaches or exceeds the peak current threshold, it indicates that the current in the switching branch in the current switching cycle has reached the corresponding control target or limit condition. The peak current control unit generates a waveform control signal so that the drive signal generation module adjusts the drive signal of the power switch according to the waveform control signal.

[0094] For example, the waveform control signal can be used to instruct the drive signal generation module to control the power switch to turn off during the current switching cycle, or to limit the on-time of the power switch during the current switching cycle. Thus, the switching state of the power switch can be directly constrained by the switching current sampling signal, achieving cycle-by-cycle peak current control.

[0095] Through the above settings, the peak current inner loop can quickly constrain the conduction state of the power switch based on the switching current sampling signal in each switching cycle. On the one hand, when the main power supply circuit experiences sudden load changes, input disturbances, or other conditions that cause a rapid increase in the switching branch current, the peak current control unit can promptly generate a waveform control signal, reducing the risk of switching current overshoot and improving the protection reliability of the power switch and the main power supply circuit. On the other hand, the peak current threshold is determined by the peak current control reference signal, which is generated by the inductor current middle loop. Therefore, the peak current inner loop can form a cascaded control relationship with the inductor current middle loop, enabling the current limiting at the switching cycle level to serve the inductor current regulation target, thereby improving the dynamic response capability and output stability of the power supply control system.

[0096] Optionally, the peak current inner loop also includes a slope compensation unit, which is used to superimpose a slope compensation signal onto the switching current sampling signal.

[0097] In this embodiment, the peak current inner loop further includes a slope compensation unit, which is used to superimpose a slope compensation signal onto the switching current sampling signal to obtain a compensated switching current sampling signal. Correspondingly, the peak current inner loop is used to generate a waveform control signal based on the peak current control reference signal and the compensated switching current sampling signal.

[0098] During peak current control, the inner loop of the peak current control typically determines whether to adjust the conduction state of the power switch in the current switching cycle based on the comparison between the switching current sampling signal and the peak current control reference signal. By superimposing a slope compensation signal onto the switching current sampling signal using the slope compensation unit, the signal being compared can include not only the actual current change information of the switching branch but also the compensation change related to the switching cycle.

[0099] The slope compensation signal can be a slope signal that varies with the switching cycle. The slope compensation signal is superimposed on the switching current sampling signal to obtain the compensated switching current sampling signal. The peak current inner loop compares the compensated switching current sampling signal with the peak current control reference signal and generates a waveform control signal based on the comparison result. For example, when the compensated switching current sampling signal reaches or exceeds the peak current threshold determined by the peak current control reference signal, the peak current inner loop generates a waveform control signal so that the drive signal generation module adjusts the drive signal of the power switch according to this waveform control signal.

[0100] By setting up a slope compensation unit, loop stability issues that may occur when performing peak current control solely based on the original switch current sampling signal can be improved. Especially under operating conditions with a high duty cycle or rapid changes in switch branch current, the slope compensation signal can compensate for the changing trend of the switch current sampling signal, making the comparison and judgment of the inner loop of peak current more stable and reducing the possibility of subharmonic oscillations, false triggering, or control jitter during peak current control.

[0101] Meanwhile, since the slope compensation signal is superimposed on the switching current sampling signal, while the peak current control reference signal is still generated by the inductor current intermediate loop, this slope compensation method does not change the peak current control target output by the inductor current intermediate loop. Instead, it compensates for the current sampling side signal participating in the comparison in the peak current inner loop. Therefore, while maintaining the cascaded control relationship between the inductor current intermediate loop and the peak current inner loop, the stability and disturbance rejection capability of the peak current inner loop can be improved.

[0102] Therefore, in this embodiment, a slope compensation signal is superimposed on the switching current sampling signal by a slope compensation unit, so that the peak current inner loop generates a wave generation control signal based on the peak current control reference signal and the compensated switching current sampling signal. This can improve the stability of the peak current control process, reduce the oscillation risk under high duty cycle or dynamic operating conditions, and further improve the dynamic response performance and output reliability of the power supply control system.

[0103] Optionally, the slope compensation unit includes a synchronization signal input terminal, a slope signal input terminal, and at least two compensation networks; The slope compensation unit is used to selectively access at least one of at least two compensation networks based on the synchronization signal received at the synchronization signal input terminal, so as to generate slope compensation signals with different slopes or different amplitudes based on the slope signal received at the slope signal input terminal.

[0104] In this embodiment, the slope compensation unit includes a synchronization signal input terminal, a slope signal input terminal, and at least two compensation networks. The synchronization signal input terminal is used to receive a synchronization signal, the slope signal input terminal is used to receive a slope signal, and the at least two compensation networks are used to process the slope signal in different ways to form slope compensation signals with different slopes or different amplitudes.

[0105] The synchronization signal is used to characterize the switching cycle synchronization timing of the inner loop of the peak current. For example, the synchronization signal can be a pulse signal or a square wave signal corresponding to the switching cycle of the power switch, used to indicate the switching time of different control stages within the current switching cycle. The ramp signal can be a signal that varies with time within the switching cycle, such as a sawtooth wave signal that rises or falls with time, a ramp voltage signal, or a ramp current signal. The compensation network can include a resistor network, a capacitor network, a voltage divider network, or a signal processing network composed of switching devices and resistor-capacitor components, used to change the amplitude, slope, or superposition ratio of the ramp signal.

[0106] In this embodiment, the slope compensation unit selectively connects to at least one of at least two compensation networks based on the synchronization signal received at the synchronization signal input terminal. That is, when the synchronization signal is in different level states, different pulse phases, or different switching cycle phases, the slope compensation unit can connect different compensation networks to the transmission path of the slope signal, or connect multiple compensation networks to the transmission path of the slope signal in different combinations. Therefore, after the slope signal is processed by different compensation networks, slope compensation signals with different slopes or different amplitudes can be formed.

[0107] For example, when the synchronization signal is in the first state, the slope compensation unit connects to the first compensation network, causing the slope signal to generate a first slope compensation signal after passing through the first compensation network; when the synchronization signal is in the second state, the slope compensation unit connects to the second compensation network, causing the slope signal to generate a second slope compensation signal after passing through the second compensation network. The slopes of the first and second slope compensation signals are different, or their amplitudes are different. Therefore, the slope compensation unit can switch or adjust the slope compensation signal according to the timing state corresponding to the synchronization signal.

[0108] The generated ramp compensation signal can be superimposed on the switching current sampling signal to obtain the compensated switching current sampling signal. The peak current inner loop generates a wave generation control signal based on the peak current control reference signal and the compensated switching current sampling signal. Since the compensated switching current sampling signal contains a ramp compensation component that changes synchronously with the switching cycle, the comparison stability of the peak current inner loop can be improved under conditions such as high duty cycle, load changes, or input disturbances, reducing the possibility of subharmonic oscillations, false triggering, or control jitter.

[0109] Through the above configuration, the slope compensation unit can selectively connect to at least two compensation networks using a synchronization signal, enabling the same slope signal to generate slope compensation signals with different slopes or amplitudes. In this way, the slope compensation signal is no longer limited to a single fixed compensation form, but can be adjusted according to the switching cycle synchronization timing or control stage, thereby improving the adaptability of the peak current inner loop to different switching conditions and further enhancing the dynamic stability and output reliability of the power supply control system.

[0110] Optionally, the slope compensation unit is configured to generate a slope compensation signal with a first compensation amount within a first duty cycle range, and to generate a slope compensation signal with a second compensation amount within a second duty cycle range. Among them, the duty cycle corresponding to the second duty cycle range is greater than the duty cycle corresponding to the first duty cycle range, and the second compensation amount is greater than the first compensation amount.

[0111] In this embodiment, the duty cycle is used to characterize the ratio of the on-time of the power switch in one switching cycle to the total on-time of that switching cycle. The first duty cycle range corresponds to the operating range where the power switch has a relatively short on-time, and the second duty cycle range corresponds to the operating range where the power switch has a relatively long on-time. The compensation amount characterizes the degree of compensation the slope compensation signal provides to the switching current sampling signal; the compensation amount can be reflected by the slope, amplitude, or superposition ratio of the slope compensation signal.

[0112] When the main power supply circuit operates within the first duty cycle range, the on-time of the power switch is relatively short within a single switching cycle, requiring a high response speed from the peak current inner loop to the switching current sampling signal. At this time, the slope compensation unit generates a slope compensation signal with a first compensation amount and superimposes this signal onto the switching current sampling signal. Since the first compensation amount is relatively small, over-compensation of the switching current sampling signal by the slope compensation signal can be avoided, thereby reducing the possibility that the peak current inner loop response speed will be affected.

[0113] When the main power supply circuit operates within the second duty cycle range, the power switch transistor has a relatively long conduction time within a single switching cycle, making the peak current control process more susceptible to loop disturbances, sampling signal fluctuations, or changes in the current slope. At this time, the slope compensation unit generates a slope compensation signal with a second compensation amount and superimposes this signal onto the switching current sampling signal. Since the second compensation amount is greater than the first compensation amount, it enhances the slope compensation effect under higher duty cycle conditions, improving the stability of the compensated switching current sampling signal when compared with the peak current control reference signal, and reducing the possibility of subharmonic oscillations, false triggering, or control jitter.

[0114] For example, the slope compensation unit can determine the duty cycle of the power switch based on the current wave transmission control signal or drive signal, and select the corresponding compensation amount according to the range of the duty cycle. When the duty cycle is within the first duty cycle range, the slope compensation unit selects a slope compensation signal with a smaller slope, smaller amplitude, or smaller superposition ratio; when the duty cycle is within the second duty cycle range, the slope compensation unit selects a slope compensation signal with a larger slope, larger amplitude, or larger superposition ratio.

[0115] With the above settings, the slope compensation unit can generate slope compensation signals with different compensation amounts according to different duty cycle ranges. Under low duty cycle conditions, a smaller compensation amount reduces the impact of the compensation signal on the peak current inner loop response speed; under high duty cycle conditions, a larger compensation amount enhances the peak current control stability. Therefore, the peak current inner loop can have good dynamic response capability and control stability under different duty cycle conditions, thereby improving the output reliability of the power supply control system.

[0116] To facilitate understanding, the following will be combined with Figures 2 to 5 The above-described power control system will be described by way of example. The above-described power control system can employ... Figures 2 to 5 The control structure and circuit structure shown are implemented. It should be noted that... Figures 2 to 5 This is merely an illustrative example of one specific implementation of the power control system and the main power circuit, and is not intended to limit the power control system to using the specific device models, connection methods, signal names, or circuit parameters shown in the figure.

[0117] Combination Figure 2 As shown, Figure 2 The overall control block diagram of the power supply control system is shown. Figure 2 The reference numerals 101 to 105 correspond to a specific implementation of the aforementioned digital control module, reference numerals 106 to 116 correspond to a specific implementation of the aforementioned analog control module, and reference numerals 117 and 118 correspond to a specific implementation of the aforementioned drive signal generation module. The digital control module, as the main setpoint and mode control layer, is used to set the target output parameters and control steady-state accuracy under constant voltage, constant current, and constant power control modes. The analog control module, as the fast response and protection layer, includes an outer loop for output parameters, a middle loop for inductor current, and an inner loop for peak current, used to adjust output parameters, track inductor current, and provide cycle-by-cycle current limiting protection. The output terminal of the digital control module can be connected to the input terminal of the analog control module, and the output terminal of the analog control module can be connected to the power switch in the main power supply circuit through the drive signal generation module. The output voltage feedback signal Vf, output current feedback signal If, inductor current feedback signal ILf, and switch current sampling signal CS in the main power supply circuit can be fed back to their respective control loops to form a multi-closed-loop control.

[0118] exist Figure 2 In the example shown, adder 101 can be used as a digital error calculation unit. Adder 101 receives the digital input signal b and the output parameter feedback signal obtained after sampling and analog-to-digital conversion, and generates a digital error signal c based on the difference between the digital input signal b and the output parameter feedback signal. Here, the digital input signal b can correspond to the target output parameter, and the digital error signal c can correspond to the digital error signal. In other words, adder 101 is used to calculate the deviation between the target output parameter and the actual output state.

[0119] The PI controller 102 can function as a digital control unit, or as a digital proportional-integral (PI) control unit within a digital control unit. The PI controller 102 is used to perform proportional-integral regulation on the digital error signal c to obtain the digital control signal e. The proportional regulation improves the digital control module's response to output deviations, while the integral regulation reduces the steady-state deviation between the target output parameter and the actual output state. Therefore, the PI controller 102 can be used to implement the function of the digital control unit in regulating the digital error signal and obtaining the digital control signal.

[0120] The self-calibration coefficient module 104 can serve as a calibration unit. The self-calibration coefficient module 104 is used to calibrate the digital given signal b or related signals in the digital control link according to calibration coefficients to generate a calibration signal d. The calibration signal d is used to compensate for inherent deviations in the sampling link, control link, digital-to-analog conversion link, or power conversion link, thereby improving the accuracy of the control target output by the digital control module. Therefore, the self-calibration coefficient module 104 can be used to implement the function of the calibration unit generating a calibration signal based on calibration coefficients.

[0121] Adder 103 can serve as a digital synthesis unit, used to superimpose the digital adjustment signal e output by PI controller 102 with the calibration signal d output by self-calibration coefficient module 104 to obtain a digital control signal f. It should be noted that in the above embodiment, the digital-to-analog converter generates an analog reference signal based on the digital adjustment signal and the calibration signal; in Figure 2 In the example shown, this process can be implemented by adding 103 in conjunction with D / A converter 105. That is, in Figure 2 In the example shown, the digital adjustment signal e and the calibration signal d can be combined into a digital control signal f by the adder 103, and then the digital control signal f can be converted into an analog reference signal g by the D / A converter 105.

[0122] The D / A converter 105 can be used as a digital-to-analog conversion unit to convert the digital control signal f into an analog reference signal g, and output the analog reference signal g to the subsequent analog control module. The analog reference signal g serves as the upper-level setpoint signal for the outer loop of the output parameters, enabling the analog control module to continue performing analog closed-loop regulation based on the control target determined by the digital control module. Therefore, Figure 2 The adder 101, PI controller 102, self-calibration coefficient module 104, adder 103 and D / A converter 105 in the model can respectively correspond to the digital error calculation unit, digital adjustment unit, calibration unit, digital signal synthesis process and digital-to-analog conversion unit.

[0123] In constant voltage mode, the digital setpoint signal b corresponds to the target output voltage, and the output parameter feedback signal corresponds to the output voltage feedback signal Vf. The digital control module generates an analog reference signal g based on the deviation between the target output voltage and the output voltage feedback signal Vf. In constant current mode, the digital setpoint signal b corresponds to the target output current, and the output parameter feedback signal corresponds to the output current feedback signal If. The digital control module generates an analog reference signal g based on the deviation between the target output current and the output current feedback signal If. In constant power mode, the digital setpoint signal b corresponds to the target output power. The digital control module determines the actual output power based on the output voltage feedback signal Vf and the output current feedback signal If, and generates an analog reference signal g based on the deviation between the target output power and the actual output power. Therefore, Figure 2 The digital control module can be used to generate analog reference signals in constant voltage, constant current and constant power modes.

[0124] Continue to combine Figure 2 As shown, the outer loop of the output parameters may include a voltage outer loop, a current outer loop, and an outer loop signal processing unit. Figure 2 The voltage outer loop generates a voltage regulation signal based on the analog reference signal g and the output voltage feedback signal Vf, while the current outer loop generates a current regulation signal based on the current reference signal h and the output current feedback signal If. The current reference signal h can be determined based on the analog reference signal g or the target output parameter. Figure 2 The PI regulation structures 107 and 110 can correspond to the regulation structures in the voltage outer loop and current outer loop, respectively. The limiting structures 108 and 111 can correspond to the limiting unit or limiting process. The cross-coupling structure 112 can correspond to the outer loop signal processing unit or coupling unit. The signal p formed after PI regulation, limiting, cross-coupling, etc., can be used as an inductor current reference signal, or used to form an inductor current reference signal and input to the inductor current middle loop.

[0125] The limiting structures 108 and 111 are used to limit the voltage regulation signal and / or current regulation signal to prevent the outer loop regulation signal from being too large or changing too rapidly, which could impact the subsequent inductor current intermediate loop. The cross-coupling structure 112 is used to generate an inductor current reference signal p based on the limited voltage regulation signal and / or the limited current regulation signal. Through this setting, the output voltage regulation requirement and the output current regulation requirement can be uniformly converted into the current setpoint target of the inductor current intermediate loop, thereby forming a clear cascaded control relationship between the output parameter outer loop and the inductor current intermediate loop.

[0126] Combination Figure 2 and Figure 3 As shown, the loop in the inductor current can correspond to Figure 2 The adder 114 and PI controller 115 are included, and can be controlled via... Figure 3 The shown loop control circuit is implemented as follows. Specifically, the inductor current reference signal p generated by the outer loop of the output parameters is input to one input terminal of adder 114 as the desired target inductor current value, and the inductor current feedback signal ILf is input to the other input terminal of adder 114 as the actual inductor current feedback value. Adder 114 generates a current error signal q based on the inductor current reference signal p and the inductor current feedback signal ILf. PI controller 115 generates an adjustment signal r based on the current error signal q. This adjustment signal r can be used as a peak current control reference signal, or used to form a peak current control reference signal. Thus, Figure 2 The adder 114 and PI controller 115 can be used to realize the function of generating peak current control reference signal based on inductor current reference signal and inductor current feedback signal in the inductor current loop.

[0127] Furthermore, combined Figure 3 As shown, the inductor current loop may include a proportional regulation branch and an integral regulation branch. For example, Figure 3 The input resistor R20 can be located in the input path of the current error signal q, and is used to form the main gain of the proportional control branch; resistors R21 and R22 and capacitor C9 can be used to form the integral control branch or the control network related to integral control. Among them, the charging and discharging state of capacitor C9 can affect the degree of influence of the integral control branch on the peak current control reference signal.

[0128] During the dynamic adjustment phase, when sudden load changes, input disturbances, or output adjustments cause rapid changes in the current error signal q, capacitor C9 cannot fully charge and discharge. The branch containing R22 and C9 is approximately open-circuit, and the integral regulation branch has a small degree of participation in the loop regulation, or temporarily does not participate in the generation of the peak current control reference signal. At this time, due to the large resistance of R21 and the weak effect of the integral regulation branch, the gain of the inductor current loop is mainly determined by the proportional regulation path corresponding to the input resistance R20, and the inductor current loop operates in the first regulation state. Therefore, the impact of integral accumulation on transient response can be reduced, the system response speed can be improved, and the risk of transient oscillation can be reduced.

[0129] When the load current or current error signal q stabilizes, the charging and discharging process of capacitor C9 gradually begins. The branch containing R22 and C9 can then participate in integral regulation, and the inductor current loop automatically enters the second regulation state. At this time, the integral regulation branch participates in generating the peak current control reference signal to a greater extent than in the first regulation state. This helps to reduce the steady-state deviation between the inductor current reference signal p and the inductor current feedback signal ILf, thereby achieving the switching between transient fast response and steady-state high-precision regulation.

[0130] thus, Figure 3 The shown loop control circuit enables the inductor current loop to have a first regulation state and a second regulation state, and makes the integral regulation effect of the inductor current loop in the first regulation state less than the integral regulation effect in the second regulation state.

[0131] In some implementations, the inductor current loop can switch between a first adjustment state and a second adjustment state based on the changing characteristics of the current error signal q. These changing characteristics may include at least one of the rate of change, amplitude change, and duration of the current error signal q. For example, when the rate of change of the current error signal q is greater than a first preset rate of change threshold, it indicates that the deviation between the inductor current reference signal p and the inductor current feedback signal ILf is changing rapidly, and the inductor current loop can operate in the first adjustment state to reduce integral regulation and improve transient response speed. When the rate of change of the current error signal q is less than or equal to a second preset rate of change threshold, it indicates that the change of the current error signal q is slowing down, and the inductor current loop can operate in the second adjustment state to enhance integral regulation and improve steady-state error suppression capability. The first preset rate of change threshold can be greater than or equal to the second preset rate of change threshold, thereby creating a switching hysteresis and avoiding frequent switching between the first and second adjustment states.

[0132] Combination Figure 2 and Figure 4 As shown, the peak current inner loop can correspond to Figure 2The peak current control unit 116 is used to generate a waveform control signal based on a peak current control reference signal r and a switching current sampling signal CS. The peak current control reference signal r characterizes the allowed or desired peak current control target within the current switching cycle, and the switching current sampling signal CS characterizes the instantaneous current in the switching branch where the power switch is located. The peak current control unit 116 compares the switching current sampling signal CS with a peak current threshold determined by the peak current control reference signal r within each switching cycle, and generates the waveform control signal when the switching current sampling signal CS reaches or exceeds the peak current threshold.

[0133] exist Figure 4 In the example shown, the peak current control unit 116 can be implemented using a peak current mode PWM controller, such as the ISL6741 or a controller with the same peak current comparison function. This type of controller can receive the switching current sampling signal CS through the CS pin, receive the control voltage corresponding to the peak current control reference signal r through the VERROR pin or the corresponding error control terminal, and output the wave generation control signal used to form the drive signal through drive output terminals such as OUTA and OUTB.

[0134] A switching cycle refers to the period corresponding to one switching control operation of a power switch at a preset switching frequency, typically including a turn-on phase and a turn-off phase. After the start of a switching cycle, the power switch can be turned on under the action of a drive signal. The current in the switching branch where the power switch is located or the primary side branch of the transformer changes with the energy transfer process of the main power supply circuit. The sampling resistor converts this current into a switching current sampling signal CS. The peak current control unit 116 compares the switching current sampling signal CS received by the CS pin with the peak current threshold determined by the peak current control reference signal r. When the switching current sampling signal CS does not reach the peak current threshold, the peak current control unit 116 does not trigger turn-off control due to peak current limitation; when the switching current sampling signal CS reaches or exceeds the peak current threshold, the peak current control unit 116 generates a waveform control signal to instruct the drive signal generation module to control the power switch to turn off within the current switching cycle, or to limit the conduction time of the power switch within the current switching cycle. Therefore, Figure 4 The peak current control circuit shown can compare the peak current control reference signal and the switching current sampling signal in each switching cycle, and generate a wave generation control signal based on the comparison result.

[0135] Continue to combine Figure 4As shown, the peak current inner loop may also include a slope compensation unit. The slope compensation unit is used to superimpose a slope compensation signal onto the switching current sampling signal CS to obtain a compensated switching current sampling signal. The peak current control unit 116 can generate a wave generation control signal based on the peak current control reference signal r and the compensated switching current sampling signal. By superimposing the slope compensation signal onto the switching current sampling signal CS, the comparison stability of the peak current inner loop under high duty cycle or dynamic disturbance conditions can be improved, reducing the possibility of subharmonic oscillations, false triggering, or control jitter.

[0136] exist Figure 4 In the example shown, the ramp compensation unit may include a synchronization signal input terminal, a ramp signal input terminal, and at least two compensation networks. Exemplarily, the CT pin can serve as a ramp signal input terminal or a ramp signal generator terminal, used to provide a sawtooth wave voltage or ramp signal that varies with the switching cycle; the SYNC pin can serve as a synchronization signal input terminal, used to provide a square wave pulse signal corresponding to the switching cycle; the external switching circuit N1 can selectively connect to different compensation networks, such as different voltage divider networks, according to the synchronization signal received by the SYNC pin.

[0137] When N1 is connected to the first compensation network, the ramp signal corresponding to the CT pin is processed by the first compensation network to form the first ramp compensation signal; when N1 is connected to the second compensation network, the ramp signal corresponding to the CT pin is processed by the second compensation network to form the second ramp compensation signal. The first ramp compensation signal and the second ramp compensation signal can have different slopes, different amplitudes, or different superposition ratios. Ramp compensation signals with different slopes or different amplitudes can be superimposed on the switching current sampling signal corresponding to the CS pin through a resistor network, enabling the peak current control unit 116 to perform peak current comparison based on the compensated switching current sampling signal.

[0138] In some implementations, the slope compensation unit can be configured to generate a slope compensation signal with a first compensation amount within a first duty cycle range and a slope compensation signal with a second compensation amount within a second duty cycle range. The duty cycle characterizes the ratio of the on-time of the power switch within one switching cycle to the duration of that switching cycle; the duty cycle corresponding to the second duty cycle range is greater than the duty cycle corresponding to the first duty cycle range, and the second compensation amount is greater than the first compensation amount. The compensation amount can be represented by the slope, amplitude, or superposition ratio of the slope compensation signal. Under low duty cycle conditions, the slope compensation unit can generate a slope compensation signal with a smaller compensation amount to reduce the impact of slope compensation on the peak current inner loop response speed; under high duty cycle conditions, the slope compensation unit can generate a slope compensation signal with a larger compensation amount to improve peak current control stability and reduce the risk of subharmonic oscillations. Therefore, the peak current inner loop can balance the dynamic response speed under low duty cycle conditions and the control stability under high duty cycle conditions.

[0139] Combination Figure 2 As shown, the wave generation units 117 and 118 can correspond to a specific implementation of the aforementioned drive signal generation module. After the wave generation control signal generated by the peak current inner loop is input to the wave generation units 117 and 118, the wave generation units 117 and 118 generate drive signals for controlling the power switching transistors according to the wave generation control signal. This drive signal is output to the power switching transistors in the main power supply circuit, causing the power switching transistors to turn on or off according to the corresponding switching cycle, duty cycle, or turn-off time. Therefore, the wave generation units 117 and 118 can serve as a specific implementation of the drive signal generation module, used to generate drive signals for controlling the power switching transistors in the main power supply circuit according to the wave generation control signal.

[0140] Combination Figure 5 As shown, Figure 5 An exemplary structure of a power supply main circuit is shown. The power supply main circuit may include at least one power switch, a transformer, a rectifier, an output inductor, and an output capacitor. The power switch is used to turn on or off under the action of a drive signal to change the energy transfer state in the power supply main circuit; the transformer is used for energy transfer and electrical isolation; the rectifier is used to rectify the electrical energy on the output side of the transformer; the output inductor and output capacitor are used to filter and store the rectified electrical energy to reduce output ripple and provide a stable output to the load. A sampling feedback module can be used to... Figure 5 The power supply main circuit shown acquires output parameter feedback signals, inductor current feedback signals ILf, and switch current sampling signals CS. The output parameter feedback signals may include output voltage feedback signals Vf and output current feedback signals If; the inductor current feedback signal ILf can be used to characterize the actual current in the branch containing the output inductor; and the switch current sampling signal CS can be used to characterize the instantaneous current in the switching branch containing the power switch or the primary side branch of the transformer.

[0141] pass Figure 5 The power supply main circuit shown has a drive signal output from the drive signal generation module that directly acts on the power switch transistor. The switching action of the power switch transistor changes the energy transfer state on the primary side of the transformer. The electrical energy output from the secondary side of the transformer is rectified by the rectifier device, then filtered by the output inductor and output capacitor to form the output of the power supply main circuit. The sampling feedback module obtains corresponding feedback signals from the output terminal of the power supply main circuit, the branch containing the output inductor, and the switching branch containing the power switch transistor, respectively, so that the outer loop of the output parameters, the middle loop of the inductor current, and the inner loop of the peak current obtain corresponding closed-loop feedback quantities. Therefore, Figure 5 The power supply main circuit shown can be used as the controlled main circuit in the power supply, and can provide output parameter feedback signals, inductor current feedback signals and switch current sampling signals to the sampling feedback module.

[0142] In conclusion, Figures 2 to 5The example shown corresponds to the functional modules and signal transmission relationships described above. Specifically, Figure 2 101 to 105 in the above can be used as one implementation of digital control modules to realize digital error calculation, digital adjustment, calibration and digital-to-analog conversion processes; Figure 2 The voltage outer loop, current outer loop, limiting structure, and cross-coupling structure in the diagram can be used as a way to implement the output parameter outer loop to generate the inductor current reference signal. Figure 2 and Figure 3 The adder 114, PI controller 115, and proportional and integral regulation branches in the inductor current loop can be used as a way to switch between the first and second regulation states. Figure 2 and Figure 4 The peak current control unit 116 in the middle can be used as an implementation of the peak current inner loop to achieve cycle-by-cycle peak current control; Figure 4 The CT, SYNC, N1 and different compensation networks in the text can be used as a way to implement the slope compensation unit, and can be used to generate slope compensation signals with different compensation amounts under different duty cycle ranges. Figure 2 The wave generation units 117 and 118 in the middle can be used as one implementation of the drive signal generation module; Figure 5 This can be used as one implementation of the main power supply circuit, and the sources of the output parameter feedback signal, inductor current feedback signal, and switch current sampling signal are shown. Therefore, this application, through a step-by-step control link of digital control module—output parameter outer loop—inductor current middle loop—peak current inner loop—drive signal generation module—main power supply circuit, improves power supply output accuracy, reduces output ripple, enhances dynamic response performance, and improves the reliability of current limiting protection for power switching transistors and the main power supply circuit, while balancing the flexibility of digital control and the speed of analog control.

[0143] Another embodiment of the present invention provides a power supply, including a main power supply circuit and the power supply control system described above.

[0144] In this embodiment, the power supply includes a main power supply circuit and the aforementioned power supply control system. The power supply control system is connected to the main power supply circuit and is used to acquire operating parameter feedback signals from the main power supply circuit, and to perform closed-loop control on the main power supply circuit based on the operating parameter feedback signals, so that the main power supply circuit outputs stably according to the target output parameters.

[0145] The main power supply circuit is used for energy conversion and to provide output power to the load. The main power supply circuit may include power switching transistors and energy conversion circuits that work in conjunction with the power switching transistors. The power switching transistors are turned on or off under the action of drive signals output by the power control system, thereby changing the energy transfer state in the main power supply circuit and thus regulating the output voltage, output current, or output power of the main power supply circuit.

[0146] The power supply control system includes a sampling feedback module, a digital control module, an analog control module, and a drive signal generation module. The sampling feedback module obtains operating parameter feedback signals from the main power supply circuit, including output parameter feedback signals, inductor current feedback signals, and switch current sampling signals. The digital control module generates an analog reference signal based on the target output parameters and the output parameter feedback signals. The analog control module generates a waveform control signal based on the analog reference signal, the output parameter feedback signal, the inductor current feedback signal, and the switch current sampling signal. The drive signal generation module generates a drive signal based on the waveform control signal and outputs the drive signal to the power switching transistors in the main power supply circuit.

[0147] Therefore, the power supply in this embodiment can utilize a digital control module to improve the flexibility of target parameter setting and steady-state adjustment, and an analog control module to improve loop response speed and cycle-by-cycle current control capability. Simultaneously, through the step-by-step closed-loop control of the analog control module's output parameter outer loop, inductor current middle loop, and peak current inner loop, the output stability of the power supply main circuit under constant voltage, constant current, or constant power operating modes can be improved, output ripple reduced, dynamic response performance improved under load changes or input disturbances, and the reliability of current limiting protection for the power switching transistors and the power supply main circuit enhanced.

[0148] Optionally, the main power supply circuit includes a transformer, rectifier, output inductor, output capacitor, and at least one power switching transistor; The sampling feedback module is used to obtain output parameter feedback signals, inductor current feedback signals, and switch current sampling signals from the main power supply circuit.

[0149] In this embodiment, the main power supply circuit includes a transformer, rectifier devices, an output inductor, an output capacitor, and at least one power switch. The sampling feedback module is used to obtain output parameter feedback signals, inductor current feedback signals, and switch current sampling signals from the main power supply circuit.

[0150] Specifically, power switching transistors are used to turn on or off under the action of a drive signal to switch and modulate the electrical energy input to the main power supply circuit. Transformers are used to transfer energy and provide electrical isolation to the electrical energy modulated by the power switching transistors. Rectifying devices are used to rectify the electrical energy on the output side of the transformer. Output inductors and output capacitors are used to filter and store the rectified electrical energy to reduce output ripple and provide a relatively stable output voltage or current to the load.

[0151] During power supply operation, the drive signal generated by the drive signal generation module acts on the power switching transistor, causing it to turn on or off according to the control logic corresponding to the waveform control signal. The switching action of the power switching transistor changes the energy transfer state on the primary side of the transformer. The electrical energy output from the secondary side of the transformer is rectified by the rectifier device, and then filtered by the output inductor and output capacitor to form the output of the main power supply circuit.

[0152] The sampling feedback module can obtain output parameter feedback signals from the main power supply circuit. These signals may include output voltage feedback signals and / or output current feedback signals. The output voltage feedback signal is sampled from the output terminal of the main power supply circuit and characterizes the actual output voltage across the output capacitor or load. The output current feedback signal is sampled from the output branch of the main power supply circuit and characterizes the actual output current supplied to the load. These feedback signals can be fed back to the digital control module and the outer loop of the output parameters for target output parameter adjustment and closed-loop control. The sampling feedback module can also obtain inductor current feedback signals from the main power supply circuit. These signals characterize the actual current flowing through the output inductor. Since the output inductor is located between the rectifier and the output terminal, the current flowing through it reflects the energy storage and transfer status on the output side of the main power supply circuit. Therefore, after the inductor current feedback signal is fed back to the middle loop of the inductor current circuit, the middle loop can generate a peak current control reference signal based on the inductor current reference signal and the feedback signal, causing the actual inductor current to follow the changes in the inductor current reference signal. The sampling feedback module can also obtain a switching current sampling signal from the main power supply circuit. The switching current sampling signal is used to characterize the instantaneous current in the switching branch where the power switch is located. For example, the switching current sampling signal can be obtained in the conducting branch of the power switch, the primary side branch of the transformer, or a sampling branch connected in series with the power switch. After the switching current sampling signal is fed back to the peak current inner loop, the peak current inner loop can generate a waveform control signal based on the peak current control reference signal and the switching current sampling signal, thereby controlling the conduction state of the power switch at the switching cycle level.

[0153] With the above configuration, the sampling feedback module can obtain corresponding feedback signals from the output terminal of the main power supply circuit, the branch containing the output inductor, and the switching branch containing the power switch, respectively. This allows the outer loop of output parameters, the middle loop of inductor current, and the inner loop of peak current to obtain corresponding closed-loop feedback quantities. Therefore, the power supply control system can perform multi-layer closed-loop control based on the output state, inductor current state, and switching current state of the main power supply circuit, improving the output stability, ripple suppression capability, dynamic response capability, and switching current protection reliability of the main power supply circuit.

[0154] Another embodiment of the present invention provides a power control method, comprising: Obtain operating parameter feedback signals from the main power supply circuit; these operating parameter feedback signals include output parameter feedback signals, inductor current feedback signals, and switch current sampling signals. A simulated reference signal is generated based on the target output parameters and the output parameter feedback signal; Based on the analog reference signal and the output parameter feedback signal, an inductor current reference signal is generated through the outer loop of the output parameters; Based on the inductor current reference signal and the inductor current feedback signal, a peak current control reference signal is generated through the inductor current loop. Based on the peak current control reference signal and the switching current sampling signal, a wave generation control signal is generated through the peak current inner loop; The drive signal for controlling the power switching transistors in the main power supply circuit is generated based on the wave generation control signal. The process of generating a peak current control reference signal through the inductor current loop includes: switching between a first adjustment state and a second adjustment state of the inductor current loop based on the variation characteristics of the current error signal between the inductor current reference signal and the inductor current feedback signal; the integral adjustment effect of the inductor current loop in the first adjustment state is less than that in the second adjustment state.

[0155] The method described in this embodiment can be applied to a power supply control system to perform closed-loop control of the power supply's main circuit. The main circuit includes power switching transistors, which are turned on or off under the action of a drive signal, thereby regulating the energy transfer and output states of the main circuit.

[0156] Specifically, in this embodiment, the operating parameter feedback signal of the main power supply circuit is first acquired. The operating parameter feedback signal includes an output parameter feedback signal, an inductor current feedback signal, and a switch current sampling signal. The output parameter feedback signal characterizes the actual output state of the main power supply circuit, such as an output voltage feedback signal, an output current feedback signal, or an output power feedback amount determined by the output voltage feedback signal and the output current feedback signal. The inductor current feedback signal characterizes the actual current state of the inductive energy storage branch in the main power supply circuit. The switch current sampling signal characterizes the instantaneous current state of the switch branch where the power switch is located.

[0157] Subsequently, a simulated reference signal is generated based on the target output parameters and the output parameter feedback signal. The target output parameters represent the desired output control target of the power supply, while the output parameter feedback signal reflects the current actual output state of the power supply's main circuit. Generating the simulated reference signal based on the deviation between the target output parameters and the output parameter feedback signal allows the simulated reference signal to characterize the required adjustment direction and amount of the current output state relative to the target output state. This simulated reference signal serves as the given signal for the subsequent outer loop of the output parameters, guiding the power supply's main circuit to adjust towards the state corresponding to the target output parameters.

[0158] Next, based on the analog reference signal and the output parameter feedback signal, an inductor current reference signal is generated through the outer loop of the output parameters. Specifically, the outer loop of the output parameters determines the current target required by the inductive energy storage branch in the main power supply circuit based on the output control target represented by the analog reference signal and the actual output state represented by the output parameter feedback signal, and generates the inductor current reference signal. Thus, the output parameter adjustment requirements, such as output voltage, output current, or output power, are converted into inductor current adjustment requirements, forming a cascaded control relationship between the outer loop of the output parameters and the subsequent middle loop of the inductor current.

[0159] Next, based on the inductor current reference signal and the inductor current feedback signal, a peak current control reference signal is generated through the inductor current intermediate loop. Specifically, the inductor current intermediate loop determines the current error signal based on the difference between the inductor current reference signal and the inductor current feedback signal, and generates the peak current control reference signal based on this current error signal. The peak current control reference signal is used as the current control target of the peak current inner loop to limit or adjust the current control level of the peak current inner loop in the current control cycle. Thus, the inductor current intermediate loop enables the actual inductor current to follow the changes in the inductor current reference signal, thereby improving the response capability of the power supply main circuit to output changes and suppressing output ripple caused by inductor current fluctuations.

[0160] Generating a peak current control reference signal via the inductor current loop involves switching between a first and a second adjustment state of the inductor current loop based on the changing characteristics of the current error signal between the inductor current reference signal and the inductor current feedback signal. The current error signal is the deviation signal between the inductor current reference signal and the inductor current feedback signal, and its changing characteristics reflect changes in the inductor current adjustment demand. For example, when the changing characteristics of the current error signal indicate a large or rapidly changing inductor current adjustment demand, the power supply main circuit may be undergoing dynamic adjustment processes such as load changes, input disturbances, output adjustments, or mode switching. In this case, the inductor current loop switches to the first adjustment state. Since the integral adjustment effect of the inductor current loop in the first adjustment state is less than that in the second adjustment state, the impact of integral adjustment on the loop's transient response can be reduced in the first adjustment state. This allows the peak current control reference signal to respond more quickly to the current error signal changes, thereby reducing the possibility of response lag, output overshoot, or loop oscillation during dynamic adjustment. When the changing characteristics of the current error signal indicate that the inductor current regulation demand is decreasing or tending to stabilize, the inductor current regulation gradually enters a relatively stable stage. In this case, the inductor current intermediate loop switches to the second regulation state. Since the integral regulation effect of the inductor current intermediate loop in the second regulation state is greater than that in the first regulation state, the compensation capability for continuous current errors can be enhanced in the second regulation state. This helps to reduce the steady-state deviation between the inductor current reference signal and the inductor current feedback signal, and improves the control accuracy of the power supply main circuit during stable operation.

[0161] Next, based on the peak current control reference signal and the switching current sampling signal, a ripple control signal is generated through the peak current inner loop. Specifically, the peak current inner loop determines the peak current control target within the current switching cycle based on the peak current control reference signal and compares this peak current control target with the instantaneous current of the switching branch represented by the switching current sampling signal. When the switching current sampling signal meets the corresponding control conditions, the peak current inner loop generates the ripple control signal, constraining the conduction or turn-off of the power switch to the switching current state, thereby achieving fast current control and current limiting protection at the switching cycle level.

[0162] Next, a drive signal is generated based on the waveform control signal to control the power switching transistors in the main power supply circuit. After the drive signal is applied to the power switching transistors, the power switching transistors are turned on or off according to the control logic corresponding to the waveform control signal, thereby changing the energy transfer state of the main power supply circuit. The output parameters, inductor current, and switching current of the main power supply circuit change accordingly, and the feedback signal of the changed operating parameters is acquired again and participates in the next round of closed-loop control.

[0163] Therefore, the method in this embodiment forms a hierarchical control link from the target output parameter to the analog reference signal, from the analog reference signal to the inductor current reference signal, from the inductor current reference signal to the peak current control reference signal, and then from the peak current control reference signal to the wave generation control signal and the drive signal. Through this hierarchical control link, output parameter adjustment, inductor current tracking, and switching current limiting are completed at different levels, which can reduce mutual interference between different control objectives and improve the coordination of multi-closed-loop control.

[0164] In summary, the method of this embodiment improves the flexibility of setting target output parameters and adjusting output deviation by generating analog reference signals based on target output parameters and output parameter feedback signals. By generating control signals step-by-step through the outer loop of output parameters, the middle loop of inductor current, and the inner loop of peak current, the coordination between output parameter adjustment, inductor current adjustment, and switching current limiting is improved. By switching between a first and second adjustment state based on the changing characteristics of the current error signal, and ensuring that the integral adjustment effect in the first adjustment state is less than that in the second adjustment state, the loop response speed is improved during dynamic adjustment, and the steady-state error suppression capability is enhanced during steady-state operation. Therefore, this power supply control method can improve power supply output accuracy, reduce output ripple, improve dynamic response performance, and enhance the reliability of current limiting protection in the main power supply circuit.

[0165] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A power supply control system, characterized in that, include: The sampling feedback module is used to acquire the operating parameter feedback signals of the main power supply circuit; the operating parameter feedback signals include output parameter feedback signals, inductor current feedback signals, and switch current sampling signals. A digital control module is used to generate an analog reference signal based on the target output parameters and the feedback signal of the output parameters; The analog control module includes an outer loop for output parameters, a middle loop for inductor current, and an inner loop for peak current. The outer loop of the output parameters is used to generate an inductor current reference signal based on the analog reference signal and the output parameter feedback signal; The inductor current loop is used to generate a peak current control reference signal based on the inductor current reference signal and the inductor current feedback signal; The peak current inner loop is used to generate a wave generation control signal based on the peak current control reference signal and the switching current sampling signal. A drive signal generation module is used to generate a drive signal for controlling the power switching transistors in the main power supply circuit based on the wave generation control signal. The inductor current loop has a first adjustment state and a second adjustment state; the inductor current loop is configured to switch between the first adjustment state and the second adjustment state according to the change characteristics of the current error signal between the inductor current reference signal and the inductor current feedback signal. The integral regulation effect of the inductor current loop in the first regulation state is less than that in the second regulation state.

2. The power control system as described in claim 1, characterized in that, The output parameter feedback signal includes at least one of an output voltage feedback signal and an output current feedback signal; the target output parameter includes at least one of a target output voltage, a target output current, and a target output power. The digital control module is used to generate the analog reference signal based on the target output voltage and the output voltage feedback signal in constant voltage mode, based on the target output current and the output current feedback signal in constant current mode, and based on the target output power and the actual output power in constant power mode; wherein the actual output power is determined based on the output voltage feedback signal and the output current feedback signal.

3. The power control system as described in claim 1, characterized in that, The digital control module includes a digital error calculation unit, a digital adjustment unit, a calibration unit, and a digital-to-analog conversion unit; The digital error calculation unit is used to determine the digital error signal based on the target output parameter and the output parameter feedback signal; The digital adjustment unit is used to adjust the digital error signal to obtain a digital adjustment signal; The calibration unit is used to generate a calibration signal based on the calibration coefficient; The digital-to-analog conversion unit is used to generate the analog reference signal based on the digital adjustment signal and the calibration signal.

4. The power control system as described in claim 1, characterized in that, The output parameter feedback signal includes an output voltage feedback signal and an output current feedback signal; the output parameter outer loop includes a voltage outer loop, a current outer loop, and an outer loop signal processing unit. The outer voltage loop is used to generate a voltage regulation signal based on the analog reference signal and the output voltage feedback signal; The outer current loop is used to generate a current adjustment signal based on the current reference signal and the output current feedback signal; wherein, the current reference signal is determined based on the analog reference signal or the target output parameter; The outer loop signal processing unit is used to generate the inductor current reference signal based on the voltage adjustment signal and / or the current adjustment signal.

5. The power control system as described in claim 1, characterized in that, The variation characteristics of the current error signal include at least one of the rate of change, amplitude change, and duration of the current error signal.

6. The power control system as described in claim 1, characterized in that, The inductor current loop includes a proportional regulation branch and an integral regulation branch; In the first adjustment state, the proportional adjustment branch participates in generating the peak current control reference signal, and the integral adjustment branch does not participate or participates in generating the peak current control reference signal to a first degree. In the second adjustment state, both the proportional adjustment branch and the integral adjustment branch participate in generating the peak current control reference signal, and the integral adjustment branch participates in generating the peak current control reference signal with a second degree of action. The degree of effect of the second action is greater than that of the first action.

7. The power control system as described in claim 1, characterized in that, The peak current inner loop includes a peak current control unit, which is used to compare the peak current control reference signal and the switching current sampling signal in each switching cycle, and generate the wave generation control signal when the switching current sampling signal reaches or exceeds the peak current threshold determined by the peak current control reference signal.

8. The power control system as described in claim 7, characterized in that, The peak current inner loop also includes a slope compensation unit, which is used to superimpose a slope compensation signal onto the switching current sampling signal. The slope compensation unit is configured to generate a slope compensation signal with a first compensation amount within a first duty cycle range, and to generate a slope compensation signal with a second compensation amount within a second duty cycle range; wherein the duty cycle corresponding to the second duty cycle range is greater than the duty cycle corresponding to the first duty cycle range, and the second compensation amount is greater than the first compensation amount.

9. A power supply, characterized in that, It includes a main power supply circuit and a power control system as described in any one of claims 1-8.

10. A power supply control method, characterized in that, include: Obtain operating parameter feedback signals of the main power supply circuit; the operating parameter feedback signals include output parameter feedback signals, inductor current feedback signals, and switch current sampling signals; A simulated reference signal is generated based on the target output parameters and the feedback signal of the output parameters; Based on the analog reference signal and the output parameter feedback signal, an inductor current reference signal is generated through the outer loop of the output parameters; Based on the inductor current reference signal and the inductor current feedback signal, a peak current control reference signal is generated through the inductor current loop. Based on the peak current control reference signal and the switching current sampling signal, a wave generation control signal is generated through the peak current inner loop; The power supply main circuit generates drive signals to control the power switching transistors based on the wave generation control signal. The process of generating a peak current control reference signal through the inductor current loop includes: switching between a first adjustment state and a second adjustment state of the inductor current loop based on the variation characteristics of the current error signal between the inductor current reference signal and the inductor current feedback signal; the integral adjustment effect of the inductor current loop in the first adjustment state is less than the integral adjustment effect in the second adjustment state.

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