Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1998-04-23
2000-08-29
Leja, Ronald W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
H02H 300
Patent
active
061117323
ABSTRACT:
An electrical power system for a cold cathode tube includes a high-voltage transformer with a primary side connected to a power supply and a secondary side connected to a cold cathode tube and includes a ground fault detector. The ground fault detector includes a resistive path, a detection circuit, an isolation circuit, and a stop latch. The resistive path is connected to the secondary side of the high-voltage transformer and is arranged to provide a ground fault path to ground fault current. The detection circuit is connected to the resistive path and is constructed and arranged to provide an output representing a fault detection signal. The isolation circuit is connected to the detection circuit and is constructed and arranged to isolate the fault detection signal from the primary side of the high voltage transformer. The stop latch has an input connected to the isolation circuit and an output connected to the power supply and is constructed and arranged to generate an inhibition signal for inhibiting operation of the power supply.
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Leja Ronald W.
Transfotec International LTEE
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