Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1983-10-04
1987-06-23
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 96, 363137, H02H 7122
Patent
active
046757996
ABSTRACT:
A power converter such as an inverter or chopper using self-turn-off type semiconductor devices supplies power to an inductive load and free wheel diodes are provided so that the current flowing through this load circulates not through the power supply but through the free wheel diodes. When it is detected that the load current exceeds a predetermined value, the self-turn-off-type semiconductors which are conductive are turned off. At this time, the self-turn-off-type semiconductors which are turned on and immediately thereafter cause the recovery current to flow in the free wheel diodes are turned off not immediately but after the recovery current disappears.
REFERENCES:
patent: 3760258 (1973-09-01), Percorini et al.
patent: 4259581 (1981-03-01), Csontos et al.
patent: 4376296 (1983-03-01), Bhagwat et al.
patent: 4433370 (1984-02-01), Karadsheh et al.
Abe Kingo
Narita Hiroshi
Okamatsu Shigetoshi
Suzuki Masato
Hitachi , Ltd.
Jones Judson H.
Wong Peter S.
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