Electronic switch

Details Electronic switch Electronic switch

1985-04-22

1987-02-17

Wong, Peter S.

Electricity: power supply or regulation systems

External or operator controlled

Phase controlled switching using electronic tube or a three...

323902, 340645, 307252B, 307252P, G05F 1455, G08B 500

Patent

active

046442588

ABSTRACT:
An electronic switch with CSE wiring, especially a triac, has a load connected in series therewith to an a-c voltage network. A rectifier bridge circuit has its a-c terminals connected into the driving circuit of the electronic switch. The d-c terminals of the bridge circuit are connected to a light-emitting diode poled in the conduction direction. Since the firing current for the switch is periodically repeated, the light-emitting diode indicates the switching state of the triac since the brief pauses without current of the LED are not perceived by the human eye.

REFERENCES:
patent: 3866194 (1975-02-01), Lawton
patent: 4065683 (1977-12-01), Clarke
patent: 4158150 (1979-06-01), Dever
patent: 4361798 (1982-11-01), Tolmie, Jr.
EDN Magazine, (1981), Jun., No. 13, Boston, Mass., pp. 192 and 196, "Three ICs Control Triacs Digitally", Julian R. Bryttan.

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