Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Plural load device systems
Patent
1981-02-25
1983-08-02
Dixon, Harold A.
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Plural load device systems
315131, 315189, 340642, H02K 3300
Patent
active
043968686
ABSTRACT:
A lamp circuit is provided having a constant current-type AC power source and a plurality of isolation transformers coupled in series with the AC power source. The secondary circuit of each isolation transformer is connected to an electric lamp. The output voltage of the constant current-type AC power source is detected to determine the times when the output voltage crosses the zero voltage level. A disconnected lamp in the circuit results in a distortion of the output voltage waveform due to the magnetic-saturation characteristics of the isolation transformer coupled to the disconnected lamp. The output voltage waveform is integrated over time between the time periods when the output voltage signal crosses the zero axis. The result of the integration is compared with a reference value. When the integrated value exceeds the reference value, an alarm signal is generated. The number of disconnected lamps may also be determined and displayed. The circuit includes a device for supplying a small current to the plurality of isolation transformers such that the status of the lamps in a circuit can be determined without illuminating any of the lamps in the circuit.
REFERENCES:
patent: 3054991 (1962-09-01), Howell
patent: 3061828 (1962-10-01), Hauck
patent: 3892735 (1974-08-01), Berlock et al.
patent: 4295079 (1981-10-01), Otsuka et al.
Takemoto Osafumi
Taniguchi Shozo
Watanabe Toshisuke
Dixon Harold A.
Tokyo Shibaura Denki Kabushiki Kaisha
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