Over 2% of the power supplies in the computer and telecommunication industries fail in the first year of operation. Cost and size reduction drive the DC-DC converters used in the power supplies to operate at higher switching frequencies and as a result the power MOSFET switches used in these converters undergo excessive electrical and thermal stress. This paper presents the results obtained from a study conducted to evaluate the various electrical stresses applied to a power MOSFET in a 350V - 3.5V, 225A full-bridge phase-shifted ZVS DC-DC converter. For the converter under study MOSFETs were found to fail under noload converter operation.
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