Solid state arc suppression device

Details Solid state arc suppression device Solid state arc suppression device

1981-04-16

1983-06-21

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 3, 361 6, 361 7, 361 13, 307135, H02H 722

Patent

active

043896910

ABSTRACT:
An arc suppression device (40) for protecting the load carrying contacts (30, 31, 32) of a power contactor (20) includes gate controlled semiconductor devices (TR1, TR2, TR3) connected in parallel with the contacts. A signal from a control circuit (45) causes gating current to be applied to the semiconductor devices nearly simultaneously with the application of current to and removal of current from the solenoid (25) of the power contactor. Circuit means (90) responds to the control signals to provide gating current for a limited period of time prior to, during and following the closing of the contacts. Gating current is not continued after the contacts have closed to protect the semiconductors from possible damage. Additional circuit means (110) responds to the removal of the control signal to provide gating current for a limited period of time prior to, during and following the opening of the contacts. An isolation relay (120) may be provided to prevent leakage current from flowing through the semiconductor devices to the load while the power contacts are open.

REFERENCES:
patent: 3237030 (1966-02-01), Coburn
patent: 3260894 (1966-07-01), Denault
patent: 3401303 (1968-09-01), Walker
patent: 3555353 (1971-01-01), Casson
patent: 3588605 (1971-06-01), Casson
patent: 3639808 (1972-02-01), Ritzow
patent: 3982137 (1976-09-01), Penrod
patent: 4025820 (1977-05-01), Penrod
patent: 4068273 (1978-01-01), Metzler

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