Light source lighting device

Details Light source lighting device Light source lighting device

1996-09-27

1999-11-30

Shingleton, Michael B

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

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

315289, 315307, 315224, 315DIG7, H05B 3702

Patent

active

059948434

ABSTRACT:
A light source power supply circuit includes a DC power source and an energy accumulating capacitor connected in parallel through a charging switching element to the DC power source. A polarity inverting circuit is connected across the energy accumulating capacitor for applying the capacitor voltage across a light source with the polarity alternately inverted. A starting high voltage generating circuit applies a high voltage to the light source a high voltage for starting the light source. A control circuit controls a polarity inverting circuit so that the inverting frequency is above a critical fusion frequency for the light source.

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patent: 5481447 (1996-01-01), Caris et al.
patent: 5519286 (1996-05-01), Rodrigues et al.
patent: 5710487 (1998-01-01), Valcke

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