Electronic ballast of high power factor for compact...

Details Electronic ballast of high power factor for compact... Electronic ballast of high power factor for compact...

2005-06-28

2005-06-28

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S118000, C315S2090SC, C315S291000, C315SDIG007

Reexamination Certificate

active

06911788

ABSTRACT:
Disclosed is an electronic ballast of a high power factor for a compact fluorescent lamp (CFL) capable of implementing a high power factor and turning on lamps of different capacitances (3W-26W), or selectively turning on two lamps having the same capacitance or one lamp, using one circuit, by separating a lamp power and a circuit driving power. The electronic ballast comprises a voltage divider for dividing a DC power inputted thereto into a lamp power and a circuit driving power, field effect transistors for controlling a voltage of the circuit driving power to provide it as a voltage for high frequency oscillation, a resistor and diodes for preventing a voltage higher than a predetermined voltage from being applied to the field effect transistors, Zenor diodes for making the voltage through the field effect transistors a constant voltage, a bulb for receiving a high frequency generated by oscillation coils through a choke coil to turn on the CF lamp, and diodes and condensers for removing a surge voltage occurring when the lamp is connected to the socket in order to protect the lamp and the socket.

REFERENCES:
patent: 4417181 (1983-11-01), Leale
patent: 5426348 (1995-06-01), Qi
patent: 5500792 (1996-03-01), Jeon et al.
patent: 5635799 (1997-06-01), Hesterman
patent: 6271633 (2001-08-01), Shen et al.
patent: 6281641 (2001-08-01), Chen et al.
patent: 6316883 (2001-11-01), Cho et al.
patent: 6486615 (2002-11-01), Hui et al.

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