Power converter with crowbar circuit and control for very fast o

Details Power converter with crowbar circuit and control for very fast o Power converter with crowbar circuit and control for very fast o

1998-12-29

2000-02-01

Berhane, Adolf Denske

Electric power conversion systems

Current conversion

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

363 21, 363 58, H02M 3335

Patent

active

060210516

ABSTRACT:
A forward converter, having a single switching device, is coupled through an isolation transformer to a crowbar circuit and an output capacitor for controlling the isolated output voltage turn-off. The crowbar circuit, including a trigger device and a resistor, is coupled between the transformer and the output capacitor. The conduction times of the converter switching device are controlled to regulate the energy stored in the transformer and to generate a reverse voltage having a predetermined amplitude. During the output voltage-on mode, the amplitude of the reverse voltage swing is controlled to be sufficiently low such that the converter operates as a conventional forward converter. For output voltage turn-off, the conduction time of the switching device is controlled to obtain a voltage swing of sufficient magnitude to trigger the crowbar circuit, and thus rapidly discharge the output capacitor.

REFERENCES:
patent: 3986097 (1976-10-01), Woods
patent: 4104714 (1978-08-01), Smith et al.
patent: 5099406 (1992-03-01), Harada et al.
patent: 5701238 (1997-12-01), Weidinger et al.
patent: 5734563 (1998-03-01), Shinada
patent: 5828558 (1999-10-01), Korcharz et al.
patent: 5886880 (1999-03-01), Hisanaga
"Push-Pull Power Converter with Crowbar Circuit for Very Fast Output Voltage Turn-Off," Laszlo Laskai, Milan Z. Ilic, Serial No. 09/222,353 (GE docket RD-26312), filed Dec. 29, 1998.

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