Fluorescent lamp starter circuit

Details Fluorescent lamp starter circuit Fluorescent lamp starter circuit

1995-02-03

1995-12-26

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Inductance in the supply circuit

315244, 315105, 315100, 315 94, 315107, H05B 4116

Patent

active

054790751

ABSTRACT:
A fluorescent lamp starter circuit includes a relay which forms a first circuit loop to detect the input voltage and to switch the relay from the normally-closed position to the normally-open position once the input voltage reaches the threshold level. The switching of the relay to the normally-open position opens the first circuit loop and closes a second circuit loop constituted partly by the relay to allow current to flow through and heat up the electrodes of the fluorescent lamp. After a certain time period, the relay, which is controlled by the discharging of a capacitor, is switched back to the normally-closed position to open the second circuit loop. The electrodes of the fluorescent lamp, after having been heated, begins to emit electrons and this lowers down the impedance that it represents so that the voltage across the first circuit loop is not sufficient to actuate the relay so as to maintain the relay at the normally-closed position.

REFERENCES:
patent: 3476976 (1969-11-01), Morita et al.
patent: 3760224 (1973-09-01), Shimizu et al.
patent: 3851209 (1974-11-01), Murakami et al.
patent: 3857060 (1974-12-01), Chermin
patent: 4350929 (1982-09-01), Katoogi

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