Light flasher circuit including GTO

Details Light flasher circuit including GTO Light flasher circuit including GTO

1976-01-23

1977-11-15

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

307132T, 307252C, 315209R, 340 81R, 340331, H05B 3909, G08B 538, H03K 302

Patent

active

040587517

ABSTRACT:
A lamp is included as a cathode load for a gate-turn-off silicon controlled rectifier (GTO). The conduction path of a transistor is connected between the gate electrode of the GTO and ground. The GTO and lamp are turned off by applying current in the forward direction through the base-emitter junction of the transistor, thereby turning on the transistor and placing the gate electrode of the GTO at ground. The forward current passes through a thermal circuit breaker which periodically opens in response to the heat produced by the current flow, causing the gate electrode of the GTO to become forward biased via the collector load resistance of the transistor and turn on.

REFERENCES:
patent: 3271700 (1966-09-01), Gutzwiller
patent: 3343046 (1967-09-01), Ladd, Jr.
patent: 3525033 (1970-08-01), Greenberg et al.

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