Electric lamp and discharge devices: systems – Condenser in the supply circuit – Electric switch in the condenser circuit
Patent
1995-06-02
1996-10-08
Gonzalez, Frank
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Electric switch in the condenser circuit
315227R, 315244, 315289, 315DIG5, H05B 3700
Patent
active
055634737
ABSTRACT:
An electronic ballast for powering at least two rapid start, parallel connected fluorescent lamps. Associated with each lamp is a serially connected choke and capacitor combination. A train of pulses of alternating polarity having a fundamental frequency, which is generated by an inverter, is applied to each serially connected combination. Each combination is characterized by a resonant frequency which is other than an odd harmonic of and at least two times and preferably .sqroot. 5 times greater than the fundamental frequency. Reduction in filament heating, following lamp ignition, is provided through the addition of voltages applied to each filament which are substantially out of phase with each other.
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Erhardt Robert A.
Mattas Charles B.
Blocker Edward
Gonzalez Frank
Philips Electronics North America Corp.
Ratliff Reginald A.
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