Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1994-03-03
1995-11-07
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 34, H02M 545
Patent
active
054652022
ABSTRACT:
In a variable frequency power source unit, a series circuit of a contactless semiconductor switching element and a resistor is provided in parallel to a d.c. smoothing capacitor, and a control circuit is provided for receiving a signal for turning on the switching element selectively at any time after the power source is interrupted, thereby discharging the electric charge on the d.c. smoothing capacitor.
REFERENCES:
patent: 4331994 (1982-05-01), Wirth
patent: 4843533 (1989-06-01), Roof et al.
patent: 5127085 (1992-06-01), Becker et al.
Baba Shigeyuki
Fujii Hiroshi
Ibori Satoshi
Ishibashi Akira
Kambara Takatsugu
Berhane Adolf
Hitachi , Ltd.
Wong Peter S.
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