Load fault detector for high frequency luminous tube power...

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

H - Electricity

05

B

H05B 41/24 (2006.01) H05B 41/285 (2006.01)

Patent

CA 2118624

LOAD FAULT DETECTOR FOR HIGH FREQUENCY LUMINOUS TUBE POWER SUPPLIES Abstract of the Disclosure 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 filterfor 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 place- ment of metalization on the high frequency power supply transformer adjacent a high voltage output lead.

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