Quasi-resonant DC-DC converters with reduced body diode loss

Details Quasi-resonant DC-DC converters with reduced body diode loss Quasi-resonant DC-DC converters with reduced body diode loss

2006-01-24

2006-01-24

Patel, Rajnikant B. (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S018000, C323S271000

Reexamination Certificate

active

06989997

ABSTRACT:
Buck converters having a resonant inductor Lr, resonant capacitor Cr, and synchronous switch Q3that together provide reduced switching loss and soft switching. In operation, the resonant inductor Lr is charged during a time period A. Then, Lr is freewheeling and provides current to an output inductor Lo. Then, Q3is turned OFF, and energy from the resonant inductor Lr charges the resonant capacitor Cr. Finally, energy from the resonant capacitor Cr is provided to the output inductor and load. The output power can be adjusted by phase control of the operation of switch Q3. In alternative embodiments, the circuit has a pair of coupled inductors L1L2or an isolation transformer40. The coupled inductors have a polarity selected so that the output voltage is reduced, thereby allowing top switch Q1to have a greater duty cycle. These circuits feature no body diode loss in the switch Q3.

REFERENCES:
patent: 5067066 (1991-11-01), Chida
patent: 5663635 (1997-09-01), Vinciarelli et al.
patent: 6429628 (2002-08-01), Nakagawa

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