Electricity: power supply or regulation systems – In shunt with source or load – Using a three or more terminal semiconductive device
Patent
1999-02-11
2000-04-18
Han, Jessica
Electricity: power supply or regulation systems
In shunt with source or load
Using a three or more terminal semiconductive device
323271, 323225, 363 56, G05F 1613
Patent
active
060519614
ABSTRACT:
A circuit technique substantially reduces the switching losses of a pulse-width-modulated (PWM) converter caused by the turning-on (closing) and turning-off (opening) characteristic of the switch and the reverse-recovery characteristic of the rectifier. The losses are reduced by using a new switch cell which includes a snubber inductor, a clamp diode, a clamp capacitor, a main switch, and an auxiliary switch. The reverse-recovery-related losses are reduced by the snubber inductor connected in series with the main switch and the rectifier to control the rate of change of rectifier current during its turn-off. In addition, the main switch operates with zero-current and zero-voltage switching, while the auxiliary switch operates with zero-voltage switching. A proper operation of the proposed circuit requires overlapping gate drives of the main and the auxiliary switches. The circuit technique can be applied to any member of the PWM converter family.
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patent: 5146399 (1992-09-01), Gucyski
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patent: 5736842 (1998-04-01), Jovanovic
"New Fast Recovery Diode Technology Cuts Circuit Losses, Improves Reliability", Y. Khersonsky, etc. PCIM, May 1992, pp. 16-25.
"High Efficiency Telecom Rectifier Using a Novel Soft-Switched Boost-Based Input Current Shaper", Robert Streit, Daniel Tollik, IEEE Intelec, Nov. 1991, pp. 720-726.
"Switched Snubber For High Frequency Switching", Koosuke Harada, Hiroshi Sakamoto, IEEE, 1990, pp. 181-188.
Jang Yungtaek
Jovanovic Milan M.
Delta Electronics , Inc.
Han Jessica
Kwok Edward C.
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