A Modeling and Analysis Method for Switching Power Converter with Digital Current Mode Control

A digital controller, digital current technology, applied in the direction of converting DC power input to DC power output, output power conversion device, adjusting electrical variables, etc., to achieve the effect of improving accuracy and simple and intuitive model
CN104008231BActive Publication Date: 2017-04-19SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2017-04-19

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Abstract

The invention discloses a modeling and analyzing method for a switching power converter controlled by a digital current mode. The method comprises the steps of (100) adopting a state-space averaging method to build a transfer function of a power level circuit of the switching power converter; (200) listing and writing a transfer function of a zero-order holding circuit of a digital controller and a delay delivery function of a digital control loop; (300) listing and writing a detection gain of an output voltage and a detection gain of an inductive current, wherein the detection gains comprise A / D conversion gains; (400) obtaining a function Gc representing a current control law according to a digital current mode control law, designing a voltage loop compensator Gv on this basis, and completing modeling of a whole switching power converter system controlled by the digital current mode; (500) finally adopting an equivalent small parameter method to conduct stability analysis on the built model. According to the modeling and analyzing method, the accuracy of the system model is improved, and the quite high application value is obtained for research on system nonlinearity.
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Description

technical field

[0001] The invention relates to modeling of switching converters, in particular to a modeling and analysis method of switching power converters controlled by digital current mode. Background technique

[0002] Switching power supply is a high-order-discrete-nonlinear-time-varying system with closed-loop control, and strong nonlinearity is the essence of switching converters. Therefore, it is an important content in the field of power electronics to study the modeling method, nonlinear mechanism and stability analysis of switching converters. Scholars at home and abroad have achieved fruitful results in the analysis of nonlinear characteristics such as chaos and bifurcation of various switching converters controlled by analog, as well as in the research of the segmental switching law of switching converters. However, due to the influence of sample and hold, time delay and quantization error in the digital control system, the analysis of the switching nonlinea...

Claims

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