Abstract：Four main types of isolated interleaved structures are discussed in this paper. Then, a series of Boost or Buck type converters are derived from the conventional interleaved Flyback converter by employing winding-cross-coupled inductors (WCCIs) and interleaved structure. Furthermore, a ZVT interleaved Flyback-Boost converter with WCCIs, active clamp circuit and primary-parallel-secondary-series (PPSS) structure is analyzed as an example to explore the circuit performance. ZVT performance is realized for both the main and the clamp switches during the whole switching transition. Only one set of active clamp circuit is necessary to recycle the leakage energy and to suppress the turn-off voltage spikes. The output diode reverse-recovery problem is alleviated by the leakage inductance. A prototype with 40V-to-760V rated at 1kW has been built to verify the effectiveness of the converters.
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2009, Vol. 24 
