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A New Pulse Frequency Modulation(PFM) Series Boost Capacitor(SBC) Full Bridge DC/DC Converter  

Shin, Yong-Saeng (국민대 전자공학과)
Jang, Young-Su (삼성전기 Power 사업팀)
Roh, Chung-Wook (국민대 전자정보통신공학부)
Hong, Sung-Soo (국민대 전자정보통신공학부)
Lee, Hyo-Bum (삼성전기 Power 사업팀)
Han, Sang-Kyoo (국민대 전자정보통신공학부)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.14, no.2, 2009 , pp. 120-127 More about this Journal
Abstract
This paper proposes a new Pulse Frequency Modulation(PFM)-Series Boost Capacitor(SBC) full bridge DC/DC Converter which features a high efficiency and high power density. The proposed converter controls the output voltage by varying the voltage across the series boost capacitor according to switching frequency and has no freewheeling period due to 50% fixed duty operation. As a result, its conduction loss is lower than that of the conventional phase shift full bridge converter. Moreover, ZVS of all power switches can be ensured along wide load ranges and output current ripple is very small. Therefore, it has very desirable merits such as a small output inductor, high efficiency, and improved heat generation. This paper performs a rationale and PSIM simulation of the proposed converter. Finally, experimental results from a 1.2kW(12V, 100A) prototype are presented to confirm the operation, validity and features of the proposed converter.
Keywords
Pulse Frequency Modulation; PFM; Series Boost Capacitor; SBC; Full Bridge Converter; Server Power Supply;
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  • Reference
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