The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 2005
Filed:
Jun. 25, 2003
Dai Sung Moon, Seoul, KR;
Dai Sung Moon, Seoul, KR;
Other;
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.