High frequency power source for fluorescent lamps and the like

Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit

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Details

315219, 315DIG7, 328 8, 331 62, 331113A, H05B 4129

Patent

active

040053350

ABSTRACT:
A power source for operating gas discharge lamps and other loads at high frequency, typically utilizing a 115 volt ac source rectified to provide a 150 volt dc input and providing a 20,000 hertz output. An inverter with a transistor current control for protection against transistor damage under open circuit, starting and no-load conditions, with low power consumption under no-load and with dimming capability. An inverter with a detector circuit connected across the feedback winding or an additional control winding for developing a control signal varying as a function of the feedback winding output, and a zener diode or other device for connecting the control signal to the base of the transistor in current controlling relation when the control signal exceeds a predetermined value.

REFERENCES:
patent: 3302130 (1967-01-01), Minks
patent: 3335316 (1967-08-01), Schneider
patent: 3889173 (1975-06-01), Klusmann et al.

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