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Voltage-current double closed-loop terminal sliding mode control method of Buck converter

A technology of terminal sliding mode and control method, which is applied in the direction of DC power input conversion to DC power output, control/regulation system, instrument, etc., which can solve the problems of low response speed and steady-state precision, and achieve fast response speed and control accuracy High and low conservatism effects

Inactive Publication Date: 2015-06-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is to solve the problem of low response speed and steady-state precision of the traditional linear sliding mode control method, and provides a Buck converter voltage-current double closed-loop terminal sliding mode control method

Method used

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  • Voltage-current double closed-loop terminal sliding mode control method of Buck converter
  • Voltage-current double closed-loop terminal sliding mode control method of Buck converter
  • Voltage-current double closed-loop terminal sliding mode control method of Buck converter

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specific Embodiment approach 1

[0029] Specific embodiment one: 1, Buck converter voltage-current double closed-loop terminal sliding mode control method of the present embodiment, it is characterized in that it realizes according to the following steps:

[0030] Buck converter voltage-current double closed-loop terminal sliding mode control method, it is realized according to the following steps:

[0031] 1. Establishment of the mathematical model of the Buck converter;

[0032] 2. According to the output voltage V of the Buck converter C and the current i through the load L , to design the load observer;

[0033] 3. The design of the voltage terminal sliding mode controller: the voltage controller tracks the error e according to the given input DC voltage v Output inductor current given signal i L * ;

[0034] 4. The design of the current linear sliding mode controller: the current controller tracks the given signal i of the inductor current L * , output the control signal u of the controllable swi...

specific Embodiment approach 2

[0035] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is that step one is specifically:

[0036] The circuit schematic diagram of the Buck converter is shown in figure 1 As shown, where E is the input DC voltage source, V is the controllable switch tube, and its working state is represented by u, V C is the output voltage, VD is the freewheeling diode, L is the filter inductance, C is the filter capacitor, R is the load resistance, Vc is the output voltage, i L is the inductor current.

[0037] Firstly, analyze the circuit characteristics of the Buck converter under the two conditions of "on" and "off" of the controllable switching tube V, and the corresponding working modes are represented by u=1 and u=0 respectively:

[0038] (1) When the controllable switch tube V is turned on, that is, u=1, the freewheeling diode VD is cut off under the reverse bias voltage, and the input DC power supply E is connect...

specific Embodiment approach 3

[0046] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is that the design of the load observer in step three is as follows:

[0047] The proposed voltage-current double closed-loop Buck converter terminal sliding mode control scheme is as follows: figure 2 shown. The outer ring is the voltage ring, and the load observer is designed to overcome the disturbance effect of the unknown load resistance and track the error e according to the input DC voltage v Output inductor current given signal i L * , the inner loop is the current loop, and the current controller tracks the given signal i of the inductor current L * , and output the control signal u=1 or u=0 of the controllable switching tube V of the Buck converter. The design process of the current controller and the voltage controller is given in detail below.

[0048] The situation where the actual control system load R is unknown is conside...

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Abstract

The invention relates to a voltage-current double closed-loop terminal sliding mode control method of a Buck converter. The voltage-current double closed-loop terminal sliding mode control method of the Buck converter aims to solve the problems that the traditional linear sliding mode control method is slow in response speed and low in stability precision, and includes the following steps: 1 mathematics model building of the Buck converter; 2 load observer design according to output voltage VC of the Buck converter and the loaded current iL; 3 voltage terminal sliding mode controller design: a voltage controller outputs an inductive current demand signal iL* according to a demand input direct-current voltage tracking error ev; 4 current linear sliding mode controller design: a current controller outputs a control signal mu of a controllable switch tube V of the Buck converter according to the inductive current demand signal iL*. The voltage-current double closed-loop terminal sliding mode control method is applied to the electricity field.

Description

technical field [0001] The invention relates to a voltage-current double closed-loop terminal sliding mode control method of a converter. Background technique [0002] (1) The traditional linear sliding mode control method has asymptotic convergence, which affects the response speed and steady-state accuracy of the output voltage of the Buck converter. [0003] Different sliding mode control methods determine the different changes of the capacitor voltage and inductor current in the Buck converter, and then directly affect the quality of its output voltage. At present, the Buck converter mainly applies the traditional linear sliding mode method. However, its convergence is asymptotic and there is a steady-state error, which makes the system state constantly approach but never reach the given trajectory, thus directly affecting the Buck transform. The response speed and accuracy of the output voltage of the device. [0004] (2) At present, the mathematical modeling method o...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 王艳敏曹雨晴夏红伟孙兰昕
Owner HARBIN INST OF TECH
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