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Advanced High Frequency Transformer Linked Soft Switching PWM DC-DC Power Converter with Utility AC Dual Voltage Modes for Low Voltage and Large Current Appl
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| Author(s) |
DOI Toshimitsu; MORIMOTO Keiki; AHMED Nabil A.; NAKAOKA Mutsuo; LEE Hyu; MANABE Haruhiko |
| Abstract |
This paper presents two new circuit topologies of dc bus line series active snubber assisted soft switching PWM full-bridge dc-dc power converter acceptable for either utility ac 200V-rms or ac 400V-rms input voltage source. One of proposed power converters is composed of a typical voltage source full-bridge high frequency PWM inverter using dc bus line side series switching devices with the aid of a parallel capacitive lossless snubber. All the active power switches in the full-bridge arms and dc bus line can achieve ZCS turn-on and ZVS turn-off commutation operation and consequently the total turn-off switching losses can be significantly reduced. As a result, a high switching frequency for used IGBTs can be actually realized more than about 20 kHz. It is proved that the more the switching frequency of full-bridge inverter increases, the more soft switching PWM dc-dc power converter with a high frequency transformer link has remarkable advantages for its power conversion efficiency and power density as compared with the conventional hard switching PWM inverter type dc-dc converter. The effectiveness of this new converter topology is proved for low voltage and large current dc-dc power supplies as arc welding machine from a practical point of view. |
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| Filename: | 0280 |
| Filesize: | 709.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2006-02-12 by System |
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