Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2008-04-10
2010-11-30
Vu, David Hung (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S307000, C315S308000, C315SDIG002
Reexamination Certificate
active
07843149
ABSTRACT:
A light dimming device for compact fluorescent lamp includes a rectifying circuit for rectifying an AC current signal into a zero crossing voltage signal and outputting it to a current limiting circuit; the current limiting circuit for limiting the zero crossing voltage signal and sending the current limited zero crossing voltage signal to a voltage regulating and filtering circuit and a first comparator; the voltage regulating and filtering circuit for regulating the current limited signal and sending the regulated current limited signal to a reference voltage generating circuit and a current controller; a reference voltage generating circuit for generating a reference voltage signal upon receiving the regulated current limited signal and sending the reference voltage signal respectively to the first comparator and a second comparator; a current controller for controlling the amount of a charging current of a capacitor; the first comparator for outputting a low voltage level signal to the capacitor after receiving the zero crossing voltage signal and the reference voltage signal to discharge the capacitor; the second comparator for outputting a drive signal to the drive circuit after receiving the discharging signal to turn on a power switch; the filter circuit for converting the discharging signal of the capacitor into a steady DC current signal and transferring the DC current signal to the compact fluorescent lamp so as to let the compact fluorescent lamp generate light of different luminance according to the amount of the DC current signal.
REFERENCES:
patent: 7019468 (2006-03-01), Deurloo et al.
patent: 7449844 (2008-11-01), Lev et al.
Shih Chun-Ming
Vu David Hung
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