CU-Boulder ECEN 5817 - Constant-Frequency Soft-Switching Converters (17 pages)

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Constant-Frequency Soft-Switching Converters



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Constant-Frequency Soft-Switching Converters

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Lecture Notes


Pages:
17
School:
University of Colorado at Boulder
Course:
Ecen 5817 - Resonant and Soft-Switching Techniques in Power Electronics

Unformatted text preview:

Constant Frequency Soft Switching Converters Introduction and a brief survey Active clamp Active clamp auxiliary switch auxiliary switch soft switching soft switching converters converters Active clamp forward converter Textbook 20 4 2 20 4 2 and on on line line notes The zero voltage transition full bridge converter Textbook Section 20 4 1 and on line notes DC Transformer ECEN5817 Lecture 38 1 ECEN 5817 The multiresonant switch Basic single transistor version 2 switch 2 switch synchronous rectifier version 2 ECEN 5817 Multiresonant switch characteristics Single transistor version Analysis via state plane in supplementary course notes 3 ECEN 5817 Multiresonant switch characteristics Two transistor version with constant frequency Favorable characteristics and wide ZVS range in constant frequency operation o tage a and d cu current e t st stresses esses a are e 2 3 3 higher g e tthan a in tthe e PWM pa parent e t Voltage 4 ECEN 5817 ZVS active clamp circuits The auxiliary switch approach Forward converter implementation Flyback converter implementation Active clamp circuit can be added to any single switch in a PWM converter M Main i switch it h plus l auxiliary ili switch it h b behave h as an unloaded l d d ZVS ZVS QSW QSW converter resulting in zero voltage transitions Improved transformer reset improved transistor utilization Note beware of various patents e g Vinciarelli 1982 for use in forward converter 5 ECEN 5817 Zero voltage transition converters The phase shifted full bridge converter Buck derived full bridge converter A popular converter for server frontend power systems Zero voltage switching of each halfbridge section Each half bridge produces a square wave voltage Phase shifted control of converter co e te output 6 Efficiencies of 90 to 95 regularly attained Controller chips available ECEN 5817 Active clamp auxiliary switch soft switching converters Can be viewed as a lossless voltage clamp snubber that employs a auxiliary c rrent bidirectional sswitch



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