LED outage detection circuit

Details LED outage detection circuit LED outage detection circuit

2008-04-23

2011-12-13

Phan, Huy Q (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

Reexamination Certificate

active

08076953

ABSTRACT:
Disclosed is an outage detection circuit for detecting a defective light source, such as a LED coupled to a DC-DC converter circuit for receiving a power signal. The outage detection circuit includes a top voltage detector coupled to the LED for detecting a voltage across the LED. The top voltage detector has a top voltage terminal for supplying a top voltage signal. The detection circuit further includes a differential amplifier coupled to the top voltage terminal for receiving the top voltage signal as a first input signal and coupled to a reference voltage terminal. The reference voltage terminal is configured to supply a reference voltage as a second input signal. The differential amplifier includes an output terminal for supplying an outage detection signal.

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