Overcurrent protection circuit for inverter device including maj

Details Overcurrent protection circuit for inverter device including maj Overcurrent protection circuit for inverter device including maj

1987-10-02

1989-04-04

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 98, H02P 7122, H02M 75387

Patent

active

048191574

ABSTRACT:
An overcurrent protection circuit for an inverter device including three arms each composed of a pair of series connected electric gates, a junction therebetween being connected to a load and opposite ends being connected across a d.c. power source, and adapted to supply a three-phase a.c. power to the load by on-off controlling the electric gates sequentially according to on-off signals of the electric gates supplied from a control circuit. Majority logic circuitry is provided, and stress conditions in the electric gates which receive substantially a stress produced when the electric gates are turned off are detected in order to release these gates from a large stress exerted on the gates when an output short-circuit occurs. The majority logic circuitry control the sequence of turning off the electric gates so that the stress on the detected gate is reduced, to protect the gates from damage due to excess stress on the gates when the output short-circuit occurs.

REFERENCES:
patent: 4672524 (1987-06-01), Toriyama et al.
patent: 4672525 (1987-06-01), Horie
patent: 4675799 (1987-06-01), Suzuki et al.

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