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Asynchronous control method of DC-DC converter

A DC-DC, asynchronous control technology, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc.

Active Publication Date: 2019-11-08
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an asynchronous control method for a DC-DC converter to solve the high-frequency characteristics of the switching circuit of the DC-DC converter and to control the stability of the switching process

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Embodiment Construction

[0020] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0021] The technical solution of the present invention will be described in detail below by taking a step-up DC-DC converter as an example in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, the present invention involves semi-Markov modeling of DC-DC converters, design of asynchronous controllers, design of closed-loop systems, solution of controllers and proof of system stability. A step-up DC-DC converter that usually works in continuous mode has two working states, such as figure 2 Shown are (a) switch closed and (b) switch open. Assum...

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Abstract

The invention discloses an asynchronous control method of a DC-DC converter, and relates to establishment of a semi-Markov switching model of the DC-DC converter and design of an asynchronous controlalgorithm. The invention discloses DC-DC converter semi-Markov switching modeling and asynchronous control algorithm design. The technical scheme is characterized in that the method comprises semi-Markov modeling of the DC converter, design of an asynchronous controller, establishment of a closed-loop system, solution of the controller, and proof of stability of the closed-loop system. For two different circuit operating states of the DC-DC converter, a switching model obeying semi-Markov distribution is established; and for switching characteristics, the asynchronous controller based on statefeedback is designed and solved, and the stability of the closed-loop system is analyzed and proved. The method can effectively solve the problem of stability control of the DC-DC converter under thecondition where the system model obeys semi-Markov switching.

Description

technical field [0001] The invention belongs to the technical field of DC power conversion, and more specifically, relates to an asynchronous control method of a DC-DC converter, that is, the switching relationship of the converter switching circuit and its asynchronous control strategy Background technique [0002] Due to the advantages of high reliability, high power density, high power factor, and high-efficiency circuit conversion, DC-DC converters have become a research hotspot and are widely used in various power electronic devices. Obtaining an accurate mathematical model is a prerequisite for studying DC-DC converters. Usually the small-signal modeling method is adopted to establish the DC-DC converter model, the literature ["Small-signal models with extended frequency range for DC–DC converters with large modulation ripple amplitude" (Xin Li, Xinbo Ruan, Qian Jin, Mengke Sha, andChi K.Tse,IEEE Transactions on Power Electronics,2018,33(9):8151-8163)] studied a DC-DC...

Claims

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Application Information

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IPC IPC(8): H02M3/00
CPCH02M3/00
Inventor 李猛徐龙宇张龙杰陈勇陈章勇
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA