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Soft Switching of Half-Bridge Converter Using Saturable Core  

Kang , Chan-Ho (Dept. of Electronics, Sojo univ., Kumamoto, JAPAN)
Kim , Hee-Jun (Division of Electrical and Computer eng. Hanyang univ.)
Harada, Koosuke (Dept. of Electronics, Sojo univ., Kumamoto, JAPAN)
Sakamoto, Hiroshi (Dept. of Electronics, Sojo univ., Kumamoto, JAPAN)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.39, no.6, 2002 , pp. 71-78 More about this Journal
Abstract
A method of soft switching in the half bridge converter using a small saturable core is presented. For the soft switching, a small dead time of both switch off is made in a pair of MOSFET switch. The saturable core is of rectangular magnetization characteristics and the core flux swings from the minus to the plus saturation during ON time of the switch. The soft switching is realized in dead time by a resonance between the saturating inductance of the core and the stray capacitance of MOSFET. As an extension of this concept, instead of the saturable core, we propose a new soft switching circuit using a linear inductance and two switches, which is especially suitable for regulating the output and also for high frequency switching. A theoretical principle of soft switching presented here was confirmed by experiments on a half bridge converter of 1.25 KW.
Keywords
Half bridge converter; Soft switching; Saturable core; Linear inductance and two switches;
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