Switching overlap protection by control gate impedance monitorin

Details Switching overlap protection by control gate impedance monitorin Switching overlap protection by control gate impedance monitorin

1984-07-26

1986-06-24

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

307252C, 340645, 363 57, H02H 712

Patent

active

045970386

ABSTRACT:
In a power converter switching system, the instantaneous blocking ability of semiconductor switching elements is determined by monitoring the reverse blocking ability of a control junction in each switching device. A gate firing circuit applies negative turn-off drive to the control junction. The control junction impedance is monitored and switch recovery is indicated by a change in the magnitude of the impedance. A switch recovery logic signal is then generated and used to initiate the firing of the next successive switch element. When switches are combined in multipulse groups, the recovery signals may be logically combined to provide proper switching coordination, emergency protection and diagnostic information.

REFERENCES:
patent: 4155113 (1979-05-01), Simmons
patent: 4231083 (1980-10-01), Matsuda et al.
patent: 4342076 (1982-07-01), Rosswurm et al.
patent: 4456949 (1984-06-01), Incledon

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