Sliding-mode control method of buck-mode direct current converter based on unknown input observer

A DC converter, unknown input technology, applied in the field of step-down DC converter sliding mode control

Active Publication Date: 2019-06-07
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a sliding mode control method based on an unknown input observer, which can effectively eliminate the disturbance problem caused by non-matching disturbance, so that the step-down DC convert

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  • Sliding-mode control method of buck-mode direct current converter based on unknown input observer
  • Sliding-mode control method of buck-mode direct current converter based on unknown input observer
  • Sliding-mode control method of buck-mode direct current converter based on unknown input observer

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Embodiment Construction

[0108] The present invention will be further described below in conjunction with the accompanying drawings.

[0109] refer to figure 1 , the present invention provides a sliding mode control method with a non-matching disturbance step-down DC converter based on an unknown input observer, comprising the following steps:

[0110] Step 1. Establish a step-down DC converter system model with matching disturbance and non-matching disturbance, and initialize the system state and control parameters. The process is as follows:

[0111] 1.1, the average model of the step-down DC converter system with matching disturbance and non-matching disturbance can be expressed as the following form:

[0112]

[0113] Among them, v o is the output voltage, i L is the output inductor current, is the input voltage V in Nominal value, L 0 、C 0 , R 0 are the nominal values ​​of the inductance L, capacitance C and load resistance R respectively, u is the control input, and the non-matching ...

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Abstract

The present invention discloses a sliding-mode control method of a buck-mode direct current converter based on an unknown input observer. The method comprises the steps of: (1) establishing a buck-mode direct current converter system model with matching disturbance and non-matching disturbance, and initializing a system state and control parameters; (2) designing an unknown input observer used forestimating matching disturbance and non-matching disturbance included in a servo system to obtain estimated values of matching disturbance and non-matching disturbance, and verifying whether the estimated values can track an actual disturbance value or not; and (3) designing a sliding-mode controller according to the estimated values of the matching disturbance and the non-matching disturbance, and controlling the buck-mode direct current converter system t output a stable power supply voltage. The sliding-mode control method of the buck-mode direct current converter based on the unknown input observer can effectively eliminate the disturbance problem caused by non-matching disturbance, improves the robustness of the system to a certain extent, and allows the output voltage of the buck-mode direct current converter to be stabilized to a desired output voltage value.

Description

technical field [0001] The invention relates to the technical field of a step-down DC converter sliding mode control method, in particular to a step-down DC converter sliding mode control method with an unknown input observer with a non-matching disturbance. Background technique [0002] Modern electronic systems require reliable, efficient and high-quality power supplies. In order to obtain satisfactory control performance, the step-down DC converter needs to have good anti-interference ability, small steady-state error, low overshoot and fast dynamic performance. Aiming at how to effectively improve the performance of the system, a variety of control methods have been proposed at home and abroad, including adaptive control, robust control, sliding mode control, optimal control and fuzzy control. Among them, the sliding mode control has the advantages of simple algorithm, insensitivity to external disturbance and parameter perturbation, and fast response speed, so it has b...

Claims

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Application Information

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IPC IPC(8): H02M1/00
Inventor 南余荣杨宇潘橹文陈强
Owner ZHEJIANG UNIV OF TECH
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