Discharge lamp starting circuit particularly for compact fluores

Details Discharge lamp starting circuit particularly for compact fluores Discharge lamp starting circuit particularly for compact fluores

1985-11-07

1987-03-03

Dixon, Harold A.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Delayed application of the discharge potential

315 99, 315100, 315101, 315105, 315226, 315244, 315245, 315DIG7, 315207, H05B 3904

Patent

active

046478175

ABSTRACT:
To provide for reliable ignition of low-pressure discharge lamps, particularly compact fluorescent lamps, operated at high frequency, for example in the order of about 45 kHz, an ignition circuit is connected in parallel to the lamp and serially with the electrodes (16, 17) thereof, which comprises a limiting capacitor (19) and the parallel circuit of a positive temperature coefficient (PTC) resistor (20) and a starting capacitor (18). The two capacitors (18, 19), together with an inductance (13, 14) in the operating circuit of the lamp, and a further capacity formed by a blocking capacitor (15), after preheating of the lamp electrodes by current flowing through the initially cold PTC resistor, will cause voltage rise across the resonance capacitors (18, 19) which will cause ignition of the lamp. The ratio of the limiting capacitor to the starting capacitor is in the order of 1:1 to 5:1, preferably about 2:1, resulting in gentle ignition in minimum time, for example about 1/2 second after energization of the lamp.

REFERENCES:
patent: 2212427 (1940-08-01), Peters
patent: 2231999 (1938-04-01), Gustin et al.
patent: 3836817 (1974-09-01), Tschang
patent: 3882354 (1975-05-01), May
patent: 4075476 (1978-02-01), Pitel
patent: 4256991 (1981-03-01), Otala
patent: 4380719 (1983-04-01), DeBijl
patent: 4406976 (1983-09-01), Wisbey
patent: 4547706 (1985-10-01), Krummel
"Elektronikschaltungen" (Electronic Circuitry) by Walter Hirschmann, Berlin/Munich, Siemens Aktiengesellschaft, 1982, p. 148.

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