Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1996-11-08
1998-07-28
Lee, Benny
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315308, 315224, 315247, 315DIG7, G05F 100
Patent
active
057866716
ABSTRACT:
An AC or DC electronic lamp-driving ballast circuit which prevents the generation of harmonic currents. The ballast circuit includes a filter for receiving and filtering an AC voltage, a ripple transformer for converting the AC voltage into a unilateral ripple voltage, and a voltage reducing transformer for pulse-width-modulating, using a modulation signal generated by a power controller, the ripple voltage into a reduced DC voltage to be transferred to the lamp. A power controller feedback-amplifies the reduced voltage, a sensing voltage of the ripple voltage, and a current sensing voltage supplied from the lamp, and then generates, using the amplified voltage, the pulse width modulation signal used by the voltage reducing transformer. A trigger generator generates high voltage trigger pulses in order to induce an initial discharge in the lamp so that the lamp may be turned on.
REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 4777409 (1988-10-01), Tracy et al.
patent: 5491387 (1996-02-01), Saito
patent: 5528111 (1996-06-01), Konopka et al.
Lee Benny
Philogene Haissa
Samsung Electronics Co,. Ltd.
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