High frequency power source for fluorescent lamps and the like

Details High frequency power source for fluorescent lamps and the like High frequency power source for fluorescent lamps and the like

1975-07-15

1977-01-25

La Roche, Eugene

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

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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