Circuit for starting and operating fluorescent lamps

Details Circuit for starting and operating fluorescent lamps Circuit for starting and operating fluorescent lamps

1981-06-10

1983-08-16

La Roche, Eugene

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315DIG5, 315105, 315106, 315239, 315243, H05B 4114, H05B 4136

Patent

active

043993915

ABSTRACT:
A circuit for starting and operating fluorescent lamps from an a-c power source, comprising reactive ballast means connected to ballast the lamps and having a non-linear characteristic for producing harmonics of the power source frequency, and a capacitor and a cathode heating transformer connected in series and connected to receive power from said ballast means and resonant in a frequency range including two or more of said harmonics. A switch may be connected in series with the capacitor and cathode heating transformer for opening the cathode heating circuit when the lamps are operating, to conserve electrical energy.

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