Compact igniter for discharge lamps

Details Compact igniter for discharge lamps Compact igniter for discharge lamps

1984-12-21

1987-02-10

Moore, David K.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315309, H05B 3904

Patent

active

046425217

ABSTRACT:
A ballast-inverter circuit for a discharge lamp with preheatable electrodes. The lamp is connected to the supply voltage input terminals via a ballast impedance. A triac provides a preheat current path for the lamp electrodes and has a gate electrode connected to an RC timing circuit. A PTC resistor is coupled between one input terminal and the timing circuit to trigger the triac so as to heat up the lamp electrodes and assist the lamp to ignite. The PTC resistor heats up until its resistance is so high that the timing circuit is no longer able to trigger the triac into conduction. The electrode preheat circuit is effectively disconnected from the lamp electrodes when the lamp is in operation.

REFERENCES:
patent: 4087723 (1978-05-01), Chermin et al.
patent: 4253043 (1981-02-01), Chermin et al.
patent: 4380719 (1983-04-01), DeBijl
patent: 4406976 (1983-09-01), Wisbey et al.

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