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Voltage tracking control method of direct current buck converter

A technology of DC step-down and control method, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., and can solve the problems of output voltage ripple, large noise, amplification, etc., and achieve good control performance and suppression The effect of system chattering and fast convergence

Inactive Publication Date: 2022-07-29
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of large output voltage ripple and noise amplification in existing control methods, the present invention provides a voltage tracking control method for a DC step-down converter

Method used

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  • Voltage tracking control method of direct current buck converter
  • Voltage tracking control method of direct current buck converter
  • Voltage tracking control method of direct current buck converter

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Experimental program
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Embodiment

[0111] The closed-loop control is performed on the output waveform of the DC buck converter. The block diagram of the digital controller of the DC buck converter is shown in image 3shown. The DC step-down converter used is composed of a given signal part, a digital controller, a PWM modulation part, a main control circuit of the DC step-down converter, a signal conditioning circuit and an AD sampling circuit. The given signal, digital controller and PWM modulation module are all realized by the ARM control board, and the rest are realized by the hardware circuit of the DC step-down converter. The entire DC step-down converter control system is given the desired signal to be output by the ARM. After PWM modulation, the high and low pulse signals of the power switch tube of the DC step-down converter are driven to realize turn-on and turn-off. The output signal of the DC buck converter is returned to the ARM through the signal conditioning circuit and the AD module to collect...

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Abstract

The invention discloses a voltage tracking control method for a DC buck converter, and the method comprises the steps: constructing a discrete variable-speed attraction law, and estimating the interference of a system through an interference compensator based on a moving average filtering technology; and constructing an ideal error dynamic state based on a discrete variable-speed attraction law and an interference compensator, designing a discrete controller according to the ideal error dynamic state, and taking a signal obtained by calculation as control input of the direct-current buck converter. Specific controller parameter setting work can be carried out according to indexes of convergence performance and steady-state performance of the system, and specific expressions of absolute attraction layers and steady-state error band boundaries representing the convergence performance and the steady-state performance of the system are given. The discrete voltage tracking control method provided by the invention has the advantages of fast convergence, effective suppression of various interferences such as system buffeting, noise and nonlinearity, and effective reduction of output voltage ripples.

Description

technical field [0001] The invention relates to a voltage tracking control method of a DC step-down converter, which is suitable for a step-down DC power supply and also for a DC-DC power supply in industrial control. Background technique [0002] A DC buck (Buck) converter is a power electronic device that realizes the voltage conversion of a DC circuit. Buck-type converters are widely used in electric vehicle charging, LED driving, aerospace and other industrial fields due to their simple and lightweight system structure, stable voltage reduction, safety and reliability. [0003] The linear proportional-integral-derivative (PID) control method is commonly used in traditional Buck converter voltage control. However, due to various disturbances such as load mutation, input voltage mutation and model parameter perturbation in Buck converters, high-performance control cannot be achieved. Sliding mode control is a nonlinear control method, which has the advantages of simple co...

Claims

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Application Information

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IPC IPC(8): H02M3/157H02M1/14
CPCH02M3/157H02M1/143
Inventor 邬玲伟雷必成梅盼林志明朱莺莺苏娜
Owner TAIZHOU UNIV
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