ANALYSIS AND DESIGN OF A 3-PHASE OFF-LINE DC-DC CONVERTER WITH HIGH-FREQUENCY ISOLATION

Single-phase off-line switch mode rectifiers (or off-line dc-dc converters) face severe component stresses in higher than 10-kW applications. This paper shows that in three phase, switch mode rectifier (SMR) topologies component stresses are reduced, and performance is improved substantially. These improvements include faster response times, reduced switching stresses of the power semiconductor devices, and reduced size and ratings of associated reactive components. This paper also presents an analysis and design approach for three-phase SMR converters under large input voltage and load variations. Output voltage control is achieved by varying the duty cycle of the inverter power semiconductor switches. Finally, theoretical results are verified experimentally.