Method and device for short circuit or open load detection

Details Method and device for short circuit or open load detection Method and device for short circuit or open load detection

2007-10-09

2007-10-09

Leja, Ronald W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C702S117000

Reexamination Certificate

active

10810303

ABSTRACT:
A method or apparatus is provided for detecting an error condition associated with a load (RL) or a connection (P) to the load (RL). The load (RL) may comprise an energy storing element (Cext). During a first diagnosis phase, it is determined whether the load (RL) or the connection (P) to the load (RL) is in a normal operation condition or in an error condition. If the load (RL) or the connection (P) to the load (RL) is in an error condition, during a second diagnosis phase it is determined whether the error condition is an open load condition, short circuit condition to ground or a short circuit condition to a power supply. When the load is in a starting state before the first diagnosis phase, the method or apparatus may further comprise carrying out, after the second diagnosis phase, a resetting phase for resetting the load to the starting state.

REFERENCES:
patent: 4962350 (1990-10-01), Fukuda
patent: 5294890 (1994-03-01), Hemminger et al.
patent: 5430438 (1995-07-01), Joos et al.
patent: 5886510 (1999-03-01), Crespi et al.
patent: 6226602 (2001-05-01), Schmitt et al.
patent: 2004/0004483 (2004-01-01), Hazelton

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