Load fault detector for high frequency luminous tube power suppl

Details Load fault detector for high frequency luminous tube power suppl Load fault detector for high frequency luminous tube power suppl

1995-04-18

1997-10-21

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361100, H02H 300

Patent

active

056802862

ABSTRACT:
Apparatus for detecting certain load fault conditions of gaseous luminous tube loads connected to high voltage, high frequency power supplies including open-circuit, broken tube and other balanced load fault conditions. The detector includes a filter for emphasizing the harmonic content of the power supply output, an attenuator, a comparator or other detector/threshold device, and a delay circuit. A power supply shut-down switch may be included or the present fault detector may be interconnected to shut-down switch of a conventional ground fault interrupter. In one embodiment the filter and attenuator and, in another, the filter, attenuator, and delay circuit employ common components and may include a filter/attenuator capacitor defined by placement of metalization on the high frequency power supply transformer adjacent a high voltage output lead.

REFERENCES:
patent: Re32904 (1989-04-01), Pacholok
patent: 3843908 (1974-10-01), Priegnitz
patent: 4613934 (1986-09-01), Pacholok
patent: 4855860 (1989-08-01), Nilssen
patent: 5029269 (1991-07-01), Elliott et al.
patent: 5089752 (1992-02-01), Pacholok
patent: 5103138 (1992-04-01), Orenstein et al.
patent: 5245498 (1993-09-01), Uchida et al.

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