Commutation failure detection and restoration for scr...

Details Commutation failure detection and restoration for scr... Commutation failure detection and restoration for scr...

H - Electricity

02

M

321/8

H02M 5/22 (2006.01) H02H 7/12 (2006.01) H02M 7/523 (2006.01) H05B 6/06 (2006.01)

Patent

CA 1118490

ABSTRACT OF THE DISCLOSURE A frequecy 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 in- hibiting the current flow through the silicon controlled rectifier to allow the same to restore to its locking state.

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