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

Active Publication Date: 2017-04-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a digital current mode control switching power converter construction considering the problems of sampling and holding, loop delay and quantization in the digital control loop. Model and Analysis Method

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

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Embodiment

[0032] Such as Figure 4 As shown, the modeling and analysis method of the switching power converter controlled by digital current mode in this embodiment includes the following steps:

[0033] S100. Establish a transfer function of the power stage circuit of the switching power converter by using the state space averaging method;

[0034] S200, write out the transfer function of the zero-order hold circuit of the digital controller and the delay transfer function in the digital control loop;

[0035] S300. Write down the detection gain of the output voltage and the detection gain of the inductor current, including the A / D conversion gain;

[0036] S400. According to the law of digital current mode control, the transfer function G representing the law of current control is obtained c , and on this basis, a voltage loop compensator G is designed v , to complete the modeling of the whole digital current mode control switching power converter system;

[0037] S500. Finally, t...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50H02M3/00
Inventor 张庆骞陈艳峰何雯
Owner SOUTH CHINA UNIV OF TECH
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