Dimmer apparatus

Details Dimmer apparatus Dimmer apparatus

1986-12-01

1988-11-29

Moore, David K.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

315287, 315307, H05B 3700

Patent

active

047884746

ABSTRACT:
An improved dimmer apparatus which can protect an output power transistor for a lamp of a load when the lamp is short-circuited and which can eliminate manual operation for restarting the apparatus after recovery of the short-circuiting of the lamp. The apparatus comprises a detecting circuit which detects short-circuiting of the lamp to turn the transistor off. After lapse of a predetermined interval of time given by a timer circuit, the transistor is turned on to detect whether or not the lamp is still short-circuited. If the lamp is still short-circuited, the transistor is again turned off and then a same sequence of operations will be repeated until it is detected that the short-circuiting of the lamp has been recovered and thus a normal operation of the apparatus is restarted.

REFERENCES:
patent: 3243653 (1966-03-01), Locklin
patent: 4570108 (1986-02-01), Stroede et al.

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