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Unmodeled dynamics induced harmonic analysis method for Buck converter sliding mode control system

A technology that does not model dynamics and control systems. It is applied to control/regulation systems, DC power input conversion to DC power output, instruments, etc., and can solve the problems that the description function method cannot be applied.

Inactive Publication Date: 2019-03-12
HARBIN ENG UNIV
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Problems solved by technology

However, the Buck converter is a typical nonlinear system, which itself contains the nonlinearity of energy storage elements such as capacitors and inductors, and the complex charging and discharging behavior also has time-varying nonlinear characteristics, which makes the description function method unable to be applied.

Method used

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  • Unmodeled dynamics induced harmonic analysis method for Buck converter sliding mode control system
  • Unmodeled dynamics induced harmonic analysis method for Buck converter sliding mode control system
  • Unmodeled dynamics induced harmonic analysis method for Buck converter sliding mode control system

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Embodiment Construction

[0076] The present invention will be further described below in conjunction with the accompanying drawings.

[0077] The invention is a new method for analyzing unmodeled dynamic induced harmonics of a Buck converter sliding mode control system based on a description function method.

[0078] figure 1 and figure 2 Respectively, the circuit configuration of the Buck converter sliding mode control system and the realization of sensors and controllers. figure 1 The dashed box is the circuit configuration of the Buck converter, where E is the DC input voltage source, D is the freewheeling diode, R is the load resistance, L and C are the inductor and capacitor respectively, and v c is the instantaneous value of the output voltage, i L and i c are the currents flowing through the inductor and capacitor respectively; S w It is a power switch tube, and it is mostly used in N-channel MOSFET applications. Its on-off state is determined by the "0" and "1" pulses output by the slidi...

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Abstract

The invention belongs to the technical field of Buck converter sliding mode control systems, and particularly relates to an unmodeled dynamics induced harmonic analysis method for a Buck converter sliding mode control system. The method specifically comprises the following steps: (1) modeling of an unmodeled dynamics Buck converter sliding mode control system for a sensor; (2) Buck converter sliding mode control; and (3) analysis of the amplitude-frequency characteristic of output voltage harmonics of a Buck converter based on a describing function method. A novel output voltage harmonic amplitude-frequency characteristic quantitative analysis method based on the describing function method is provided for the Buck converter sliding mode control system, and a novel harmonic induction mechanism under the co-existence of switching nonlinearity of a sliding mode controller and unmodeled dynamics of the sensor is provided.

Description

technical field [0001] The invention belongs to the technical field of a Buck converter sliding mode control system, and in particular relates to an unmodeled dynamic induced harmonic analysis method of a Buck converter sliding mode control system. Background technique [0002] In the buck converter sliding mode control system, the switching nonlinearity of the sliding mode controller and the unmodeled dynamics of the sensor co-exist and interact with each other, which will lead to the increase of the buck converter output voltage harmonics, but there is no coupling between the two Under the action of harmonic induction mechanism research. [0003] In the Buck converter sliding mode control system, on the one hand, from the mathematical mechanism, the switching control of the sliding mode controller is related to the nonlinear function sgn(.) contained in its control law, which will inevitably lead to the output voltage harmonics of the Buck converter , it is difficult to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 孙兰昕英钊王艳敏买永锋
Owner HARBIN ENG UNIV
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