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Non-singular terminal sliding-mode control method for Buck converter with constant switch frequency

A constant switching frequency, non-singular terminal technology, applied in the output power conversion device, DC power input to DC power output, adaptive control and other directions, can solve the impact of Buck converter output voltage response speed and accuracy, voltage output Low quality, slow response speed of Buck converter, etc.

Inactive Publication Date: 2015-07-15
HARBIN INST OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to propose a non-singular terminal sliding mode control method for a Buck converter with a constant switching frequency, so as to solve the problem of slow response speed and low voltage output quality of the Buck converter using a linear sliding mode control method, which directly affect the Buck conversion. The problem of the response speed and accuracy of the output voltage of the device

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  • Non-singular terminal sliding-mode control method for Buck converter with constant switch frequency
  • Non-singular terminal sliding-mode control method for Buck converter with constant switch frequency
  • Non-singular terminal sliding-mode control method for Buck converter with constant switch frequency

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specific Embodiment approach 1

[0056] Specific implementation mode one: as figure 1 As shown, the non-singular terminal sliding mode control method of the Buck converter with constant switching frequency described in this embodiment, the specific implementation process is as follows:

[0057] 1. Establishment of the average state model of the Buck converter

[0058] The circuit schematic diagram of the Buck converter is shown in figure 1 shown, where V i is the input DC voltage source, V is a controllable switch tube, its working state is represented by u, V 0 is the output voltage, VD is the freewheeling diode, L is the filter inductance, C is the filter capacitor, R is the load resistance, i L is the inductor current.

[0059] First analyze the circuit characteristics of the Buck converter under the two conditions of "on" and "off" of the controllable switch tube V, and the corresponding working modes are represented by u=1 and u=0 respectively.

[0060] (1) When the controllable switch tube V is tur...

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Abstract

The invention provides a non-singular terminal sliding-mode control method for a Buck converter with constant switch frequency and relates to a sliding-mode control method for the Buck converter. The problems that when a linear sliding-mode control method is adopted, the response speed of the Buck converter is low, the voltage output quality is low, and the response speed and the precision of output voltage of the Buck converter are directly influenced are solved. According to the method, based on an average state model of the Buck converter, by changing a duty ratio of a switch device, trigger pulses are generated for controlling on or off of the switch device, and then constant switch frequency voltage output of the Buck converter is achieved; a non-singular terminal sliding-mode controller of the Buck converter is designed, the advantages of strong robustness, overall finite time constriction, high stability precision and the like of the controller are utilized for overcoming the disturbance influence of load resistance, direct-current input voltage and the like, and therefore the quality of the output voltage is improved.

Description

technical field [0001] The invention relates to a sliding mode control method of a Buck converter. Background technique [0002] Using the traditional sliding mode control method to directly control the voltage output of the Buck converter, the switching device is required to work at an infinite switching frequency, and the switching frequency is not fixed. However, in practical applications, it is limited by the highest frequency of the switching device. [0003] At present, a large number of applied studies have proved that sliding mode control has become an effective robust control method for DC converters such as Buck, and its relay control characteristics have strong adaptability to DC converters. However, the traditional sliding mode control method directly controls the Buck converter and requires the switching frequency of its switching device to be at the megahertz level or even higher. However, in practical applications, due to the circuit characteristics of the swi...

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Application Information

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IPC IPC(8): H02M3/155G05B13/04
CPCH02M3/157
Inventor 王艳敏夏红伟曹雨晴孙兰昕
Owner HARBIN INST OF TECH
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