Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1991-02-21
1992-06-16
Mottola, Steven
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315107, 315DIG5, H05B 3702
Patent
active
051227126
ABSTRACT:
To decrease the losses in the starting circuit for a compact fluorescent p, a positive temperature coefficient (PTC) resistor (KL) is connected in a resonance circuit of the lamp and also connected to the power supply of the lamp through a diode, polarized in blocking direction with respect to direct current, so that, before the lamp fires, a-c provided from an inverter (INV) can pre-heat the electrodes (E1, E2) of the lamp (LP), which will also cause current flow through the PTC resistor (KL); upon heating of the PTC resistor, this d-c current decreases and the voltage across the electrodes of the lamp will rise. When the lamp fires, it will drop below the supply voltage of the operating circuit for the lamp, thus causing the removal of the PTC resistor from the current carrying circuit, thereby eliminating energy loss through that resistor, and heating of the operating circuit assembly.
REFERENCES:
patent: 4647817 (1987-03-01), Fahnrich et al.
patent: 4782268 (1988-11-01), Fahnrich et al.
patent: 5008596 (1991-04-01), Kastl et al.
patent: 5027033 (1991-06-01), Zuchtriegel
Mottola Steven
PATENT TREUHAND GESELLSCHAFT fur elektrische Gluhlampen m.b.H.
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