A Design Method of Segmented Control System for llc Resonant Converter
A resonant converter, segmented control technology, used in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problems of LLC resonant converter control system design difficulties, inability to improve stability, etc. , to achieve the effect of simple and easy calculation process, clear design ideas, and enhanced stability
Active Publication Date: 2021-05-18
GUANGXI UNIV
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[0004] The purpose of the present invention is to provide a control system design method for LLC resonant converter, thereby solving the problem that the stability of LLC resonant converter cannot be improved due to the difficulty in designing the control system
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[0039] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.
[0040] Throughout the specification and claims, unless expressly stated otherwise, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include stated elements and not to exclude other components.
[0041] figure 1 A schematic diagram of the design flow of the LLC resonant converter control system proposed by the present invention is shown. The design process specifically includes:
[0042] S1, establishing a small signal model according to the circuit parameters of the LLC resonant converter;
[0043] S2, dividing the small-signal model of the LLC resonant converter into two parts with the resonant frequency as the boundary, and obtaining the corresponding tr...
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The invention relates to the technical field of electronic converter control, and specifically discloses a method for designing a segmented control system of an LLC resonant converter, comprising: establishing a small signal model according to circuit parameters of the LLC resonant converter; The signal model is divided into two parts with the resonant frequency as the limit, and the corresponding transfer function analytical expressions of the two parts are obtained respectively; the LLC resonant converter is determined according to the resonant frequency range of the two parts and the corresponding DC gain curves under full load and minimum load conditions. The two-part working range of The corresponding compensator is designed to obtain the boundary point with the worst open-loop stability margin. Therefore, a segmented control system of the converter is designed, thereby improving the stability of the controller.
Description
technical field [0001] The invention relates to the technical field of power electronic converter control, in particular to a segmented control system design method of an LLC resonant converter. Background technique [0002] In order to improve the stability of the LLC resonant converter, it is necessary to optimize the design of the control system of the LLC resonant converter. The design needs to be based on modeling. However, for the resonant converter, small-signal modeling is very challenging. Because some of these state variables have a large ac component, the averaging concept commonly used in converters using pulse width modulation (PWM) is no longer applicable. For the LLC resonant converter, the equivalent circuit model proposed based on the concept of extended description function is the most successful model. This modeling approach uses a fundamental approximation, i.e. only the fundamental component of the resonant network variables is considered. In the worki...
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IPC IPC(8): H02M3/335
CPCH02M3/33569Y02B70/10
Inventor 陆益民刘东黄险峰
Owner GUANGXI UNIV