Inverter for an electronic ballast having independent start-up a

Details Inverter for an electronic ballast having independent start-up a Inverter for an electronic ballast having independent start-up a

1996-07-10

1998-05-05

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315219, 315291, 315307, 315278, 315209R, 315DIG4, H05B 3702

Patent

active

057479429

ABSTRACT:
The electronic ballast for a gas-discharge lamp includes an inverter. The inverter uses the combination of a step-up transformer, a resonant circuit, and clamping diodes to provide an operational inverter output voltage that is independent of the start-up output voltage of the inverter. During the start-up mode, the step-up transformer is used to provide the start-up voltage for the lamp and the resonant circuit is inactive. Clamping diodes prevent or inhibit the resonant circuit from resonating with potential parasitic capacitances during the start-up mode. During the operational mode, an oscillator is tuned relative to the resonant frequency of a resonant circuit to control the brightness of the fluorescent lamp.

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