Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1989-06-14
1991-04-23
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315287, 315307, 315DIG7, H05B 3702
Patent
active
050102788
ABSTRACT:
An electronic switching ballast for fluorescent lamp having a rectifying circuit, a square generator, a phase discriminator, a switching time differentiating circuit and a wave shaping circuit. The alternating current input signal provided to the ballast is rectified by the rectifying circuit to a direct current signal. The square generator generates a square wave signal in reference to the direct current signal. The phase discriminator compares a feedback signal from the wave shaping circuit with a reference signal corresponding to the direct current signal to provide a full-wave rectified signal. The switching time differentiating circuit combines the square wave signal and full-wave rectified signal, and differentiates the combined signal to generate a pair of pulsed signals. The pulsed signals are out of phase with respect to one another. The wave shaping circuit provides a full-wave sinusoidal signal in reference to the pair of pulsed signals to an external circuit and feeds at least a portion of the signal back to the phase discriminator.
REFERENCES:
patent: 4039897 (1977-08-01), Dragoset
patent: 4523131 (1985-06-01), Zansky
patent: 4651060 (1987-03-01), Clark
patent: 4717862 (1988-01-01), Anderson
patent: 4782268 (1988-11-01), Fahnrich
LaRoche Eugene R.
Sung Ho Korea Company
Zarabian Amir
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