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:
Jan. 03, 1995
Filed:
Nov. 24, 1993
Bog Youn Kang, Cheongju, KR;
Goldstar Instrument & Electric Co., Ltd., Seoul, KR;
Abstract
An electronic ballast circuit for discharge lamps, comprising a power factor enhancing and noise removing circuit for enhancing a power factor of an input AC voltage and removing a noise component therefrom, a rectification circuit for full wave-rectifying and smoothing an output voltage from the power factor enhancing and noise removing circuit to output a DC voltage, a drive voltage supply circuit having a primary winding of a first transformer for limiting current, the drive voltage supply circuit receiving the DC voltage from the rectification circuit, limiting an amount of current to a second transformer and supplying an initial drive voltage to an inverter, the second transformer driving the discharge lamps, a base driving circuit having a secondary winding of the first transformer, the base driving circuit supplying a voltage induced in a third winding of the second transformer and a current induced in the secondary winding of the first transformer as base drive voltage and current to the inverter, and a current control circuit for stabilizing a current induced in the second transformer and then supplied to the discharge lamps, the inverter driving the second transformer in response to the voltages from the rectification circuit and the base driving circuit.