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DC-DC buck converter high-order sliding mode control method

A technology of high-order sliding mode and control method, which is applied in the direction of control/regulation system, conversion of DC power input to DC power output, instruments, etc., to achieve good robustness

Active Publication Date: 2013-10-30
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
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But this method still requires a current measurement circuit

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  • DC-DC buck converter high-order sliding mode control method
  • DC-DC buck converter high-order sliding mode control method
  • DC-DC buck converter high-order sliding mode control method

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Embodiment Construction

[0062] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0063] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or elem...

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Abstract

The invention provides a DC-DC buck converter high-order sliding mode control method. The method comprises the steps that firstly, a finite-state machine second-order sliding mode controller is built for a buck converter, a sliding mode variable is defined, a sliding mode surface is built, an effective state and a primary state are set so that the effective state corresponds to output quantity of the controller; secondly, sliding mode quantity is defined by using output quantity of the buck converter and a set value, a sliding mode dynamic equation is built and analyzed, and the convergence condition of the finite-state machine second-order sliding mode controller is obtained under the condition that no output overshoot exists; thirdly, a finite-state machine second-order sliding mode controller with a time-lag value is built according to the finite-state machine second-order sliding mode controller, the sliding mode variable is converged to a balance point under the condition of limited frequency, and namely output of the buck converter tracks the set value without deviation.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a high-order sliding mode control method for a DC-DC buck converter. Background technique [0002] Pulse width modulation (PWM) control is widely used in direct current - direct current (DC-DC) converters. It obtains the output switching signal according to the output voltage and other state variables, and controls the DC-DC converter to track the reference voltage. This method requires the use of an integral term of the output error to ensure zero error at steady state. Its main advantage is the ability to operate the converter at a constant switching frequency, making it very good electromagnetic compatibility (EMI). However, it also has some disadvantages: [0003] 1) The integral term may slow down the dynamic response of the converter; [0004] 2) It is a control method based on small signals, and the dynamic performance of the converter can only be guaranteed within a r...

Claims

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Application Information

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IPC IPC(8): H02M3/155
Inventor 凌睿董燕武美蓉赵靖喻业琴廖化容罗成渝刘伟迟同信柳杨赵国言胡银超
Owner CHONGQING UNIV
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