Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Plural load device systems
Patent
1991-03-05
1992-03-24
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Plural load device systems
315131, 315136, 315256, 315315, H01J 160, H05B 3700, H05B 4116
Patent
active
050991779
ABSTRACT:
A plurality of current transformers connected in series provide secondary winding sides respectively connected to lamps. A constant-current source is provided to supply constant current to these lamps. Each lamp is connected to the corresponding terminal unit including a short-circuit switch for short-circuiting the secondary winding side of the transformer when the lamp is disconnected. A master station issues a request for detecting a disconnected lamp or checking whether or not failure occurs in the terminal unit to each terminal unit in the form of an instant power interruption. Each terminal unit has a proper identification time assigned thereto. In response to the request issued by the master station in the form of an instant power interruption, after the proper identification time for each terminal unit, the relevant terminal unit serves to turn off a short-circuit switch for opening the secondary winding side of the transformer for a predetermined time or, during the proper identification time, the terminal unit serves to control the short-circuit switch on and off according to a predetermined code to respond to the request issued by the master station. In the master station, the constant-current source reads the information from each terminal unit based on the waveform change of an output current and output voltage of the constant-current source so as to determine whether or not each lamp is disconnected, where the disconnected lamp is located, whether or not each terminal unit fails, and where the failed terminal unit is located.
REFERENCES:
patent: 4295079 (1981-10-01), Otsuka et al.
patent: 4396868 (1983-08-01), Watanabe et al.
patent: 4449073 (1984-05-01), Mongoven et al.
patent: 4939505 (1990-07-01), Cappellini et al.
Doya Ryoji
Narita Kazutoyo
Noda Kiyoshi
Okabe Tomonori
Taniguchi Shozo
Kabushiki Kaisha Toshiba
LaRoche Eugene R.
Shingleton Michael B.
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