Commutation failure detection and restoration for SCR frequency

Details Commutation failure detection and restoration for SCR frequency Commutation failure detection and restoration for SCR frequency

1979-01-24

1980-11-18

Miller, J. D.

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

By semiconductor converter

363 54, 363 57, 219 1077, H05B 504

Patent

active

042349176

ABSTRACT:
A frequency converter having a silicon controlled rectifier comprises a protection circuit which includes a series resonant circuit connected in parallel with the silicon controlled rectifier to generate a reverse voltage thereacross in response to a short circuit established in response to a commutation failure of the silicon controlled rectifier. An inhibit circuit is provided to respond to the reverse voltage by inhibiting the current flow through the silicon controlled rectifier to allow the same to restore to its locking state.

REFERENCES:
patent: 3821509 (1974-06-01), Amagami et al.
patent: 3916287 (1975-10-01), Brenneisen et al.
patent: 3947748 (1976-03-01), Klein
patent: 4074101 (1978-02-01), Kiuchi et al.
patent: 4092509 (1978-05-01), Mitchell

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