Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1996-12-26
1998-03-03
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
H02M 3335
Patent
active
057242356
ABSTRACT:
The present invention relates to a DC-DC converter, and aims at preventing a flywheel switch from being destroyed. A PWM control circuit outputs an oscillation signal in order to alternately switch between a main switch and a rectification switch, and a flywheel switch. A state detecting unit generates a control instruction signal for a controlling unit, if the DC-DC converter is powered down or if it is overloaded. The controlling unit turns off the flywheel switch by controlling a driving circuit which controls the on/off status of the flywheel switch. An electric current I.sub.Q2 flows via a parasitic diode D.sub.Q2, when the flywheel switch is turned off. With the above described configuration, the flywheel switch can be prevented from being destroyed, when the DC-DC converter is overloaded, or when an overcurrent occurs due to power-down.
REFERENCES:
patent: 4841425 (1989-06-01), Maeba et al.
patent: 5519599 (1996-05-01), Shinada et al.
patent: 5619403 (1997-04-01), Ishkawa et al.
patent: 5631810 (1997-05-01), Takano
Futakawa Tohru
Shimamori Hiroshi
Suzuki Hiroyuki
Tokimi Sentarou
Fujitsu Ltd.
Nguyen Matthew V.
Shindengen Electric Mfg., Co., Ltd.
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