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:
Apr. 12, 2005
Filed:
Jun. 25, 2003
Dai Sung Moon, Seoul, KR;
Dai Sung Moon, Seoul, KR;
Other;
Abstract
Disclosed is an electronic ballast for a fluorescent lamp having a high capacitance capable of turning on lamps of different capacitances (36W, 18W), or selectively two lamps of the same capacitance or one lamp, using one circuit, by replacing a lamp driving unit with an integrated circuit (IC). The electronic ballast comprises a power separator for separating a DC power into a lamp power and a circuit driving power, a constant-voltage unit for making the circuit driving power a constant voltage, a switching signal generator that is driven by the power supplied from the constant-voltage unit, for generating a pulse width modulation (PWM) signal corresponding to a capacitance of a lamp connected thereto to lamps having different capacitance or a plurality of lamps, a first transformer for inducing the signal outputted from the switching signal generator to the secondary side, first and second field effect transistors for performing a switching operation corresponding to the output signal from the secondary side of the first transformer in order to generate a high voltage for turning on a fluorescent lamp, and a plurality of bulb for turning on the lamp (CF lamp) using the high voltage generated by the second and third transformers.