Monitoring circuit for determining if an electric element...

Details Monitoring circuit for determining if an electric element... Monitoring circuit for determining if an electric element...

2011-07-31

2011-12-06

Nguyen, Hoai-An D (Department: 2858)

Electricity: measuring and testing

Electric lamp or discharge device

Electric lamp

C324S403000, C315S129000

Reexamination Certificate

active

08072223

ABSTRACT:
A circuit for monitoring the functionality of an electrical element. A primary power supply provides direct current to the electrical element at a current sufficient for the electrical element to operate. A Schottky diode is disposed between the primary power supply and the electrical element, wherein the electrical element draws its operational current through the Schottky diode when in operation. A reverse bias power supply is provided. An opto-isolator is disposed between the reverse bias power supply and the electrical element. The electrical element draws a secondary current from the reverse bias power supply through the opto-isolator. The opto-isolator creates an output signal that is indicative of the secondary current. The output signal is used to control a remote failure indicator. When the electrical element fails, the current flowing through the opto-isolator stops. This triggers the failure indicator and informs a user as to the failed status.

REFERENCES:
patent: 4348613 (1982-09-01), Hormel et al.
patent: 5185736 (1993-02-01), Tyrrell et al.
patent: 6452340 (2002-09-01), Morrissey et al.
patent: 6963170 (2005-11-01), Higgins
patent: 7332867 (2008-02-01), Cho

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