System and method for reducing transient switch currents in an a

Details System and method for reducing transient switch currents in an a System and method for reducing transient switch currents in an a

1998-04-06

2000-07-18

Riley, Shawn

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 26, 363 56, H02M 3335, H02H 7122

Patent

active

060916109

ABSTRACT:
Various systems and methods for providing soft-start and soft-stop to an asymmetrical half-bridge converter and a power supply employing such systems or methods. The power supply includes a power train including an asymmetrical half-bridge converter having an energy storage device coupled across a complementary switch thereof. In one embodiment, a conductive path is coupled across the energy storage device to substantially discharge the energy storage device and thereby reduce current stress in the complementary switch when the converter turns on. In another embodiment, a controller, coupled to the complementary switch, provides a drive waveform to drive the complementary switch. The controller increases a duty cycle of the drive waveform as the converter turns off.

REFERENCES:
patent: 4194238 (1980-03-01), Masaki
patent: 4254459 (1981-03-01), Belson
patent: 4347558 (1982-08-01), Kalinsky
patent: 4713740 (1987-12-01), Drabing
patent: 4843533 (1989-06-01), Roof et al.
patent: 4967333 (1990-10-01), Callier et al.
patent: 5303137 (1994-04-01), Peterson
"Asymmetrical Duty Cycle Permits Zero Switching Loss in PWM Circuits with No Conduction Loss Penalty" by Paul Imbertson and Ned Mohan: Jan./Feb. 1993 IEEE: pp. 121-125.
Static and Dynamic Analysis of Zero-Voltage-Switched Half-Bridge Converter with PWM Control by Tamotsu Ninomiya, Norio Matsumoto. Masatoshi Nakahara and Koosuke Harada: 1991 IEEE: pp. 230-237.
"Family of Two-Switch Soft-Switched Asymmetrical PWM DC/DC Converters" by Phua Chee Heng and Ramesh Oruganti: 1994 IEEE: pp. 85-94.

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