Design of planar integrated passive module for zero-voltage switched asymmetrical half bridge PWM converter

Integrated L-L-C-T (inductor-inductor-capacitor-transformer) technology has been the subject of intensive research over the last few years. Its application to resonant power electronic converters has been reported by many previous publications. This paper presents the application of a planar L-L-C-T module to the integration of passive module for a zero-voltage-switched asymmetrical half bridge PWM converter for application in distributed power systems. Two output transformers, two current doubler inductors, the ZVS resonant inductor and the transformer DC decoupling capacitor are integrated into a single module. The design procedure is discussed and some special considerations of the L-L-C-T module in nonresonant applications are addressed. A 1 kW 300 V-400 V input, 48 V output asymmetrical half bridge PWM converter (AHBC) employing the L-L-C-T module is constructed. A comparison of the AHBC using the integrated passive module and the same circuit using discrete components is given.