Indicator system having multiple LEDs

Details Indicator system having multiple LEDs Indicator system having multiple LEDs

2006-10-17

2006-10-17

Wu, Daniel (Department: 2612)

Communications: electrical

Land vehicle alarms or indicators

External signal light system

C340S657000, C340S815450, C315S077000, C362S545000

Reexamination Certificate

active

07123136

ABSTRACT:
An indicator system having light emitting diode (LED) indicators and an open-circuit detecting circuit. In the open-circuit detecting circuit, a voltage at a point between a constant current source and the first resistor is applied to a base of a transistor. The second resistor is connected in parallel between the base and an emitter of the transistor. The third and the fourth resistors are connected in series between the constant current source and a collector of the transistor. The fifth resistor is connected between the emitter of the transistor and the first resistor. The threshold determining circuit determines a voltage at a point between the third and the fourth resistors as a threshold voltage. With this configuration, the threshold voltage can be adjusted according to the resistance of the first resistor.

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patent: 6535113 (2003-03-01), Gravolin
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patent: 6927683 (2005-08-01), Sugimoto et al.
patent: A-2002-076439 (2002-03-01), None

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