Abstract
Traditionally, single-input-multi-output power converters are used to power different parts of a system assembled on a printed circuit board (PCB). The imperfections of this strategy are well-known and include complicated PCB design and thermal management, poor load side voltage regulation, and reduced power density and efficiency. A DC distributed bus, obtained using a resonant LLC bus converter, can be employed in order to tackle problems regarding voltage distribution. This paper focuses on the resonant bus converter (useful for direct POLs or to downstream regulators) used to feed the DC distributed bus, and proposes an innovative method that introduces the homopolarity cycle and that adjusts the LLC converter at the resonant operation. The LLC converter's behavior is studied in a 2D plane called homopolarity plane. It is shown that the LLC converter works at resonance, if the reference line is observed in the homopolarity plane. In addition, the proposed homopolarity width control method is able to significantly enhance the efficiency of the LLC converter by bringing the converter to resonant operation and employing synchronous rectifiers, and is able to close the converter to the adiabatic region.
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