New start-up schemes for isolated full-bridge boost converters

Two new start-up schemes for isolated full-bridge boost converters are proposed in this paper. The control timing for each scheme, which is compatible with the PWM control timing for the normal boost mode operation, is investigated. Design considerations on the relationships between the turns ratios of the boost choke windings and the main transformer windings, and its effects on the operation of the converter, are studied. The two proposed start-up schemes are experimentally verified on a 1.6 kW, 12 V/288 V prototype.

[1]  Fred C. Lee,et al.  Design, implementation, and experimental results of bi-directional full-bridge DC/DC converter with unified soft-switching scheme and soft-starting capability , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[2]  I. Barbi,et al.  A single-switch flyback-current-fed DC-DC converter , 1998 .

[3]  Fred C. Lee,et al.  A soft-switched, full-bridge boost converter employing an active-clamp circuit , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.

[4]  Harry A. Owen,et al.  Analysis and design of a push-pull current-fed converter , 1981, 1981 IEEE Power Electronics Specialists Conference.

[5]  Jih-Sheng Lai,et al.  Bi-directional DC to DC converters for fuel cell systems , 1998, Power Electronics in Transportation (Cat. No.98TH8349).

[6]  Fred C. Lee,et al.  Characterization of an active clamp flyback topology for power factor correction applications , 1996 .

[7]  W. A. Peterson,et al.  Boost-buck push-pull converter for very wide input range single stage power conversion , 1995, Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95.