Sliding Mode Control Method for Step-Down DC Converter Based on Exponential Power Reaching Law

A DC converter and step-down technology, which is applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of not very outstanding robustness performance, and achieve rapid adjustment of anti-disturbance characteristics, excellent anti-disturbance The effect of disturbance characteristics

Active Publication Date: 2022-01-25
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] Moreover, the robustness performance of traditional sliding mode control in complex working environments is not very prominent, so when designing sliding mode controllers, how to improve the anti-disturbance performance of the converter system in complex working environments is also a difficulty that needs to be solved urgently

Method used

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  • Sliding Mode Control Method for Step-Down DC Converter Based on Exponential Power Reaching Law
  • Sliding Mode Control Method for Step-Down DC Converter Based on Exponential Power Reaching Law
  • Sliding Mode Control Method for Step-Down DC Converter Based on Exponential Power Reaching Law

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Embodiment Construction

[0114] The present invention will be further described below in conjunction with the accompanying drawings.

[0115] refer to Figure 1-Figure 3 , the step-down DC converter control method based on the improved exponential power reaching law provided by the present invention includes the following steps:

[0116] Step 1. Establish a step-down DC converter system model under the action of time-varying disturbances, such as input voltage perturbation, output load fluctuations, and inductance-capacitance parameter perturbations, and initialize the system state and control parameters. The process is as follows:

[0117] 1.1, the step-down DC converter system model under the action of time-varying disturbance can be expressed in the following form:

[0118]

[0119] Among them, V o is the output voltage, i L is the inductor current, is the input voltage V in Rated value, L 0 、C 0 、r 0 are the nominal values ​​of inductance L, capacitance C and load resistance r respecti...

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Abstract

The invention discloses a sliding mode control method of a step-down DC converter based on an exponential power reaching law, which includes: (1) establishing a system model of a step-down DC converter under the action of time-varying disturbance, and initializing the system State and control parameters, and converted to the disturbance model of the step-down DC converter; (2) Design an unknown input observer to estimate the time-varying disturbance in the step-down DC converter system; (3) Observation based on the unknown input The sliding mode controller is designed by using the converter and the improved exponential power reaching law to control the step-down DC converter system to output a stable power supply voltage. The control method provided by the invention realizes compound control on the problem of time-varying disturbance in the system, improves the control accuracy and the anti-disturbance performance of the system; compared with the ordinary sliding mode control, the output voltage error convergence time is faster, and the improvement The exponential power reaching law has a faster approach rate and shorter approach time, which suppresses the output chattering.

Description

technical field [0001] The invention belongs to the technical field of step-down DC converters, and in particular relates to a sliding mode control method of a step-down DC converter based on an exponential power reaching law. Background technique [0002] Step-down DC converter is a power electronic device that can reduce the input fixed DC voltage to another DC adjustable voltage, and is widely used in communications, computers, automobile manufacturing, office automation equipment, medical equipment, military, aerospace Aviation and other fields involve almost every industry in the national economy. [0003] For this type of converter, the control method commonly used in the industry is PID control. The PID control method is mainly used in occasions where the accuracy of the output voltage is not high, and the PID control is sensitive to the change of the system parameters. When the load undergoes a sudden change due to external disturbance, the step-down DC converter co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 南余荣杨晨冰邢展鹏陈强
Owner ZHEJIANG UNIV OF TECH
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