Hybrid switch using a one-shot firing pulse

Details Hybrid switch using a one-shot firing pulse Hybrid switch using a one-shot firing pulse

1994-11-25

1996-06-18

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 13, 361115, H03K 1700

Patent

active

055284434

ABSTRACT:
Semiconductor switching elements (inverse-parallel connected thyristors) of each main circuit element unit are connected in parallel to a main contact of an electromagnetic contactor. An operation input voltage signal applied to an electromagnetic coil of the electromagnetic contactor is detected by an input-voltage detecting circuit of a control section. When the electromagnetic contactor is closed and opened, a one-shot-pulse generating unit outputs a one-shot pulse based on an output of the input-voltage detecting circuit and a signal indicating an opening/closing state of an auxiliary normally-closed contact of the electromagnetic contactor. The semiconductor switching elements are made on only for a short time by a firing circuit based on the one-shot pulse, to turn on and off a load current.

REFERENCES:
patent: 3783305 (1974-01-01), Lefferts

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