Indicator circuit for protecting light emitting diode

Details Indicator circuit for protecting light emitting diode Indicator circuit for protecting light emitting diode

1991-04-16

1992-02-04

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340641, 361 18, 361 93, 323312, G08B 2100

Patent

active

050862944

ABSTRACT:
An indicator circuit for indicating the states of various electric components such as limit switches, comprising a light emitting device such as a light emitting diode, and a constant current device, such as a constant current diode, connected in series with the light emitting element. The constant current element significantly expands the operable range of the input voltage to the indicator circuit, and keeps the brightness of the light emitting device constant over a wide input voltage range. For high voltage applications, a plurality of constant current devices may be connected in series, and, preferably, balancing resistors and/or zener diodes may be connected in parallel with them.

REFERENCES:
patent: 3624481 (1971-11-01), Macharg
patent: 4328586 (1982-05-01), Hansen
patent: 4710699 (1987-12-01), Miyamoto
patent: 4712056 (1987-12-01), Schott
patent: 4779027 (1988-10-01), Sikora
patent: 4808975 (1989-02-01), Hochhaus

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