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The Research & Design of High-Efficiency Synchronous Rectification Buck DC/DC Conversion
Author: WuYuQiang
Tutor: WuYuGuang
School: Xi'an University of Electronic Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Slope compensation Current Mode Control Current detecting circuit Pulse Width Modulation DC / DC switching converter
CLC: TM46
Type: Master's thesis
Year: 2008
Downloads: 653
Quote: 5
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Abstract
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DC / DC converter has been in the field of communications, computer , and consumer electronics products such as the widely used. In order to improve its performance , high efficiency, high precision , high integration is an important design consideration . This paper first introduces the working principle of the step-down DC / DC converter , in-depth analysis of the source of a variety of power loss of the converter and synchronous rectification . Analysis and critical circuit of the DC / DC converter design, the including : slope compensation circuit , error amplifier / compensation network , PWM comparator , the inductor current detection circuit , synchronous rectification drive circuit , freewheeling detection circuit . In this paper, a novel structure of the built-in inductor current sensing circuit and synchronous rectification drive circuit to achieve a combination of current mode pulse width modulation with synchronous rectification , and effectively improve the efficiency of the DC / DC converter , precision and integration . The whole design 0.35um 3.3V CMOS models , simulation results show that the power conversion efficiency up to 91 % of steady-state output voltage ripple for 7mV load regulation of ? 0.428 ( % / A ) , linear adjustment rate , are met or better than a predetermined indicators meet the requirements of high efficiency and high precision . 0.26 ( 1 / V ) %
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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter
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