Ground fault protection of gas lamp power supplies

Details Ground fault protection of gas lamp power supplies Ground fault protection of gas lamp power supplies

1997-05-05

1999-04-06

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 93, H02H 300

Patent

active

058926461

ABSTRACT:
A power supply for powering a neon sign assembly includes a ground fault detection circuit having a current sensing circuit that produces a voltage that is proportional to the current that flows from a center tap of an output transformer, a phase-sensitive rectifier that receives output from the current sensing circuit and a reference voltage from the transformer and produces an output voltage that depends on the magnitude of the output from the current sensing circuit and the phase angle between the output from the current sensing circuit and the reference voltage, and an amplitude comparator that produces an output to a latch circuit only when an output voltage from the phase-sensitive rectifier is equal to or greater than a pre-set ground fault current limit.

REFERENCES:
patent: 4613934 (1986-09-01), Pacholok
patent: 4809123 (1989-02-01), Allington et al.
patent: 5615075 (1997-03-01), Kim

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