A 13 kW high frequency FB ZVS DC-DC converter with additional capacitors

摘要

The conventional phase-shifted zero-voltage-switching (ZVS) DC-DC power converter is applied to many power supplies in order to reduce the voltage and current stresses of the main switching devices. The ZVS method needs a fairly large leakage inductance in the primary side of the high frequency power transformer to obtain good ZVS characteristics. Large leakage inductance results in several defects-small effective duty, high primary current and low efficiency etc. The proposed ZVS topology can obtain almost the same ZVS characteristics even though the circuit has small leakage inductance. The proposed ZVS full-bridge (FB) DC-DC power converter unit of 13 kW (125 V, 100 A)/30 kHz for a battery charger was designed, verified experimentally and applied to real unit. This paper includes its operating sequence, simulation and experimental results.