Trailer marker light substitution circuit

Details Trailer marker light substitution circuit Trailer marker light substitution circuit

1981-05-22

1983-04-19

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Automatic substitution of the load device or electrode

With current shifting switch

307 10LS, 315135, 315 77, 340642, H05B 3910, B60Q 126

Patent

active

043807186

ABSTRACT:
An improved dual polarity substitution circuit for energizing a secondary load, such as an incandescent lamp, upon failure of a primary load. Dual polarity is achieved through the use of parallel PNP and NPN transistors, one of which conducts so long as the primary load is functional. Upon failure of the primary load and interruption of current flow in the conducting one of the transistors, a bidirectional switch such as a triac is fired to energize the secondary load.

REFERENCES:
patent: 3659146 (1972-04-01), Munson
patent: 3883777 (1975-05-01), Morita
patent: 4128860 (1978-12-01), Spiteri
patent: 4216525 (1980-08-01), Spiteri

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