A frequency controlled bidirectional synchronous rectifier converter for HEV using super-capacitor

In this paper, a control method of a bidirectional zero-voltage-switching (ZVS) DC-DC converter for HEV power system is presented. By controlling the minimum and maximum values of the inductor current, the ZVS condition is achieved. Also employing the variable frequency control with respect to the variation of the DC-link current and the super-capacitor voltage, the circulating energy loss at the light load condition is minimized. A 1.25 kW experimental hardware prototype module is built to verity the efficiency improvement, especially at the light load condition. It shows about 34% efficiency improvement compared to the fixed frequency control at the light load condition.

[1]  C. Henze,et al.  Zero-voltage switching in high frequency power converters using pulse width modulation , 1988, APEC '88 Third Annual IEEE Applied Power Electronics Conference and Exposition.

[2]  Yingqi Zhang,et al.  A new soft switching technique for buck, boost and buck-boost converters , 2002 .

[3]  F. C. Lee,et al.  A zero-voltage-switching bidirectional battery charger/discharger for the NASA EOS satellite , 1992, [Proceedings] APEC '92 Seventh Annual Applied Power Electronics Conference and Exposition.

[4]  M. Brkovic,et al.  High frequency synchronous buck converter for low voltage applications , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[5]  Fred C. Lee,et al.  Improve light load efficiency for synchronous rectifier buck converter , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[6]  T. Suntio,et al.  Small-signal modeling for design of robust variable-frequency flyback battery chargers for portable device applications , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).