Staggered parallel Buck converter dynamic phase adjusting system and control method thereof

Abstract

The invention discloses an interleaving Buck converter dynamic phase adjusting system and a control method thereof, the interleaving Buck converter dynamic phase adjusting system comprises a Buck converter module, the output of the Buck converter module is connected with a DC load, the adjusting system further comprises a load detection unit, a central processor and a phase adjusting unit; the input end of the load detection unit is connected with a direct-current load and used for detecting load change, the output end of the load detection unit is connected with the central processing unit, the output of the central processing unit is connected with the phase adjustment unit, and the central processing unit is responsible for receiving load change information of the load detection unit. A control signal is sent to the phase adjusting unit according to the load change information; and the phase adjustment unit is connected with the Buck converter module and is used for updating driving signals of each Buck converter branch in the Buck converter module. The working efficiency of the interleaved parallel Buck converter can be remarkably improved, output ripples are reduced, and the stability and reliability of the system are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic converters, and in particular to a dynamic phase adjustment system for an interleaved parallel Buck converter and a control method thereof. Background Art

[0002] A certain type of equipment unit has two input power supplies: AC 380V and DC 24V. The DC 24V primarily provides power for optoelectronic sighting equipment, relays, sensors, integrated control boxes, and primer circuits. Among these DC loads, relays, sensors, integrated control boxes, and optoelectronic sighting equipment have low power consumption and require prolonged power-on standby periods. The primer circuit, on the other hand, is only connected to the DC power supply during firing and requires a high current to be supplied instantly from zero to ensure reliable ammunition firing. A multiphase interleaved parallel Buck converter can output a stable voltage within a wide range of load variations, making it suitable for low-voltage, high-current DC power supply scenarios for this equipment unit. However, in practice, sudden changes in load conditions can lead to reduced efficiency and increased output ripple.

[0003] Currently, there are generally two approaches to improving the operating efficiency of multi-phase interleaved parallel Buck converters under load changes: first, using MOS tubes or IGBTs to control the automatic switching of certain phase branches, directly cutting off certain branches to improve efficiency when the load is light. However, this method increases components and costs, affecting the economic efficiency of the system; second, manual intervention to adjust the phase difference between each phase branch, but this method has poor real-time performance and is not suitable for the operating conditions where the DC load of the equipment unit changes frequently and instantaneously.

[0004] In summary, since the primer current of this equipment unit is only connected instantaneously during firing and disconnected immediately after firing, the load of the DC power supply circuit changes frequently. Although the multi-phase interleaved parallel Buck converter topology is suitable for this operating condition, its efficiency will also decrease when the load changes. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to improve the working efficiency of the DC power supply module of the equipment unit device. In order to solve the above problem, a dynamic phase adjustment system of an interleaved parallel Buck converter and a control method thereof are provided.

[0006] The object of the present invention is achieved in the following manner: A dynamic phase adjustment system for interleaved parallel Buck converters includes a Buck converter module, the output of which is connected to a DC load. The adjustment system also includes a load detection unit, a central processing unit, and a phase adjustment unit. The input end of the load detection unit is connected to the DC load for detecting load changes, the output end of the load detection unit is connected to the central processing unit, and the output of the central processing unit is connected to the phase adjustment unit. The central processing unit is responsible for receiving load change information from the load detection unit and sending a control signal to the phase adjustment unit based on the load change information. The phase adjustment unit is connected to the Buck converter module and is used to update the drive signal of each Buck converter branch in the Buck converter module.

[0007] The load detection unit includes a voltage acquisition module, a current acquisition module and a signal processing module; the inputs of the voltage acquisition module and the current acquisition module are connected to the DC load for acquiring the load voltage and current, and the outputs of the voltage acquisition module and the current acquisition module are connected to the signal processing module, which filters the load voltage and current and sends them to the central processing unit.

[0008] The phase adjustment unit includes a PWM signal generation module, which is responsible for updating the drive signal of each Buck converter module according to the control signal sent by the central processing unit, and adjusting the actual phase stagger angle of each branch by changing the phase of the PWM signal.

[0009] A control method based on the staggered parallel Buck converter dynamic phase adjustment system, the method comprising the following steps: Step A1: Initialization phase: After the system starts, the operating parameters of each Buck converter branch are initialized, including the preset initial phase angle. ;The system enters normal operating mode and starts to detect load changes in real time; Step A2: Real-time monitoring: The central controller reads the load voltage sent by the load detection unit through the high-speed ADC at a certain sampling period. and current , through adaptive filtering, to obtain load power change information ; Step A3: Phase adjustment calculation: According to the current load power change , calculate the optimal phase stagger angle: Where K is a constant coefficient, For about The function expression of is the initial phase stagger angle; Step A4: Phase adjustment execution: The central processing unit controls the phase adjustment unit to update the driving signal of each converter branch according to the calculated new phase stagger angle.

[0010] Beneficial effects of the present invention: The dynamic phase adjustment system and control method for interleaved parallel Buck converters provided by the present invention can significantly improve the operating efficiency of interleaved parallel Buck converters, reduce output ripple, and enhance system stability and reliability. The system is particularly suitable for the DC power supply system of the equipment unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the block diagram of the dynamic phase adjustment system of the multi-phase interleaved parallel Buck converter.

[0012] Figure 2 It is the control signal of the three-phase interleaved parallel Buck converter.

[0013] Figure 3 Flowchart of dynamic phase adjustment of multi-phase interleaved parallel Buck converter. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0016] like Figure 1 As shown, a dynamic phase adjustment system for an interleaved parallel Buck converter includes a Buck converter module, the output of which is connected to a DC load. The adjustment system also includes a load detection unit, a central processing unit, and a phase adjustment unit; the input end of the load detection unit is connected to the DC load for detecting load changes, the output end of the load detection unit is connected to the central processing unit, the output of the central processing unit is connected to the phase adjustment unit, the central processing unit is responsible for receiving load change information from the load detection unit and sending a control signal to the phase adjustment unit based on the load change information; the phase adjustment unit is connected to the Buck converter module and is used to update the drive signal of each Buck converter branch in the Buck converter module.

[0017] The Buck converter module is a three-phase interleaved parallel Buck converter. To achieve high-efficiency energy conversion, the three-phase interleaved parallel Buck converter is taken as an example. Its control signal is as follows: Figure 2 shown.

[0018] The central processing unit uses a high-performance microcontroller as a core processing unit and has a high-speed ADC interface.

[0019] The load detection unit includes a voltage acquisition module, a current acquisition module, and a signal processing module. It can detect load changes in real time and report them to the central processing unit. The inputs of the voltage and current acquisition modules are connected to the DC load to acquire the load voltage and current. The outputs of the voltage and current acquisition modules are connected to the signal processing module, which adaptively filters the load voltage and current before transmitting them to the central processing unit. Voltage acquisition typically uses a resistor divider network, while current acquisition can utilize Hall effect sensors, current transformers, and other methods.

[0020] The phase adjustment unit includes a PWM signal generation module, which is responsible for updating the drive signal of each Buck converter module according to the control signal sent by the central processing unit, and adjusting the actual phase stagger angle of each branch by changing the phase of the PWM signal.

[0021] like Figure 3 As shown, a control method based on the staggered parallel Buck converter dynamic phase adjustment system comprises the following steps: Step A1: Initialization phase: After the system starts, the operating parameters of each Buck converter branch are initialized, including the preset initial phase angle. ;The system enters normal operating mode and starts to detect load changes in real time; Step A2: Real-time monitoring: The central controller reads the load voltage sent by the load detection unit through the high-speed ADC at a certain sampling period. and current , through adaptive filtering, to obtain load power change information ; Step A3: Phase adjustment calculation: According to the current load power change , calculate the optimal phase stagger angle: Where K is a constant coefficient, For about The function expression of is the initial phase stagger angle; Step A4: Phase adjustment execution: Based on the calculated new phase stagger angle, the microcontroller controls the phase adjustment unit to update the drive signals for each converter branch. This changes the waveform of the PWM drive signal for each phase, staggering the conduction of each phase. The time delay is t = (k*Ɵ / 360)*Tsw, where k is the phase number, Ɵ is the stagger angle, and Tsw is the switching period.

[0022] The dynamic phase adjustment system and control method for interleaved parallel Buck converters provided by the present invention can significantly improve the operating efficiency of interleaved parallel Buck converters, reduce output ripple, and enhance system stability and reliability. They are particularly suitable for the DC power supply system of such equipment units.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the scope of protection of the present invention.

Claims

1. A dynamic phase adjustment system for interleaved parallel Buck converters, comprising a Buck converter module, wherein the output of the Buck converter module is connected to a DC load, and characterized in that: The adjustment system also includes a load detection unit, a central processing unit and a phase adjustment unit; the input end of the load detection unit is connected to the DC load for detecting load changes, the output end of the load detection unit is connected to the central processing unit, and the output of the central processing unit is connected to the phase adjustment unit. The central processing unit is responsible for receiving load change information from the load detection unit and sending a control signal to the phase adjustment unit based on the load change information; the phase adjustment unit is connected to the Buck converter module for updating the drive signal of each Buck converter branch in the Buck converter module.

2. The interleaved parallel Buck converter dynamic phase adjustment system according to claim 1, characterized in that: The load detection unit includes a voltage acquisition module, a current acquisition module and a signal processing module; the inputs of the voltage acquisition module and the current acquisition module are connected to the DC load for acquiring the load voltage and current, and the outputs of the voltage acquisition module and the current acquisition module are connected to the signal processing module, which filters the load voltage and current and sends them to the central processing unit.

3. The dynamic phase adjustment system for interleaved parallel Buck converters according to claim 1, characterized in that: The phase adjustment unit includes a PWM signal generation module, which is responsible for updating the drive signal of each Buck converter module according to the control signal sent by the central processing unit, and adjusting the actual phase stagger angle of each branch by changing the phase of the PWM signal.

4. A control method for a dynamic phase adjustment system of an interleaved parallel Buck converter according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: Step A1: Initialization phase: After the system starts, the operating parameters of each Buck converter branch are initialized, including the preset initial phase angle. ;The system enters normal operating mode and starts to detect load changes in real time; Step A2: Real-time monitoring: The central controller reads the load voltage sent by the load detection unit through the high-speed ADC at a certain sampling period. and current , through adaptive filtering, to obtain load power change information ; Step A3: Phase adjustment calculation: According to the current load power change , calculate the optimal phase stagger angle: Where K is a constant coefficient, For about The function expression of is the initial phase stagger angle; Step A4: Phase adjustment execution: The central processing unit controls the phase adjustment unit to update the driving signal of each converter branch according to the calculated new phase stagger angle.

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