Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Plural load device systems
Patent
1985-11-18
1987-06-23
Rowland, James L.
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Plural load device systems
340642, H01J 160
Patent
active
046755748
ABSTRACT:
A monitoring device for use with a loop circuit including a plurality of lights, which includes a monitoring current transformer having a magnetic core with a primary circuit connected in series with the loop and a secondary circuit coupled to the primary circuit, the primary circuit being arranged such that the loop current saturates the transformer core and the secondary circuit being in open-circuit condition, the monitoring current transformer generating a monitoring voltage signal in response to each inversion of the loop current. The monitoring voltage signal is used to generate a window signal during the time interval when the monitoring voltage signal has a significant value and the window signal is then used to control the integration of a signal representative of the loop voltage with a view to producing a detecting signal which is indicative of the number of defective lights. The integration time interval is thereby determined whatever the loop current waveform may be.
REFERENCES:
patent: 2992365 (1961-07-01), Brill
patent: 3054991 (1962-09-01), Howell
patent: 3061828 (1962-10-01), Hauck
patent: 3781853 (1973-12-01), Jacobs
patent: 4255669 (1981-03-01), Naugle
patent: 4295079 (1981-10-01), Otsuka et al.
patent: 4396868 (1983-08-01), Watanabe et al.
Myer Daniel
n.v. ADB s.a.
Rowland James L.
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