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1. RESONANT CONVERTER WITH RESONANT-VOLTAGE-MULTIPLIER
RECTIFIER AND CONSTANT FREQUENCY PHASE-SHIFT CONTROL FOR
ISOLATED BUCK-BOOST POWER CONVERSION
ABSTRACT
Isolated resonant converters based on novel resonant voltage-multiplier rectifier (RVMR)
are proposed in this paper. Output voltage regulation is achieved by using simple dual phase-
shift control, through which all of the switches can operate at the constant resonant frequency.
Theoretical analysis indicates that, by using the proposed RVMR, the proposed resonant
converter can realize zero-voltage switching for all of the active switches and zero-current
switching for all of the diodes within the entire operating range without introducing additional
circulating current and conduction loss. In addition, the converter is suitable for wide voltage
applications due to its isolated Buck and Boost conversion capability. Furthermore, the output
voltage can be increased with the RVMR, which benefits to reduce the turns ratio of the
transformer. The operational principles and characteristics of the proposed converter are
presented in detail. The analysis and performance have been fully validated experimentally on a
400V/400W-output hardware prototype.