1. SOFT-SWITCHING DC-DC CONVERTER WITH A FULL ZVS RANGE AND
REDUCED OUTPUT FILTER FOR HIGH-VOLTAGE APPLICATIONS
ABSTRACT:
A new soft-switching dc/dc converter, which can solve the drawbacks of existing phase-shifted fullbridge converters such as narrow zero-voltage-switching (ZVS) range, large circulating current, large dutycycle loss, and a large output filter in high-voltage applications, is proposed in this paper. The proposed
converter is composed of two symmetric half-bridge inverters that are placed in parallel on the primary side
and are driven in a phase-shifting manner to regulate the output voltage. At the rectifier stage, two fullbridge rectifiers sharing two low-current-rating diodes are employed. This structure allows the proposed
converter to have the advantages of a full ZVS range, no problems related to duty-cycle loss, no circulating
current, and a significantly reduced output filter. In this paper, the circuit configuration, operation principle,
and relevant analysis results of the proposed converters are presented. Experimental results on a prototype
converter realized with the specification of 80-in plasma display panel sustain power module (320-385 Vdc
input, 205 Vdc/5 A output) validate the theoretical analysis