Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1999-02-10
2000-06-06
Wong, Don
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315DIG5, 315 94, 315209R, 315106, G03F 100
Patent
active
060722851
ABSTRACT:
The invention provides a soft starter device for lamps. The soft starter device includes a rectifying circuit for converting an AC voltage into a DC voltage which serves as a triggering signal; a high frequency voltage generating circuit for generating a high frequency voltage by an oscillation between two transistors; a high frequency output transformer electrically connected to the high frequency voltage generating circuit and having a primary coil and a secondary coil; a first capacitor for providing a momently high voltage to a lamp tube by generating a resonance together with the high frequency output transformer; and a control circuit having a charging circuit and a switch for grounding the secondary coil connected thereto or allowing the secondary coil to function normally. At the initial time of power supplying, the switch is turned on to ground the secondary coil, causing the primary coil being not able to function, such that only a current flows into the lamp tube to preheat the filaments thereof. After a short charging time, the switch is turned off to allow the primary coil and the secondary coil to function normally, so that the first capacitor provides a high voltage to start the lamp tube by generating a resonance together with the high frequency output transformer.
REFERENCES:
patent: 5363020 (1994-11-01), Chen et al.
patent: 5461286 (1995-10-01), Hirschmann
patent: 5543690 (1996-08-01), Bernicke et al.
patent: 5854538 (1998-12-01), Krummel
patent: 5932974 (1999-08-01), Wood
Pro Up Tech Co., Ltd.
Vo Tuyet Thi
Wong Don
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