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. 29, 2004
Filed:
Oct. 30, 2002
Guan-Chyun Hsieh, Taipei, TW;
National Taiwan University of Science and Technology, Taipei, TW;
Abstract
A generator is used in a controllable dimmer ballast of a fluorescent lamp for eliminating a striation. The generator includes an interface for transforming an input signal to a first input voltage and a second input voltage, an oscillator electrically connected to the interface for receiving the first input voltage and producing a pair of complementary pulse trains, a comparator electrically connected to the interface for receiving and comparing the second input voltage with a given threshold voltage and providing an enable signal, and a controller electrically connected to the oscillator and the comparator for alternately modulating the pulse trains and providing a first and a second control signals according to the pulse trains and the enable signal so as to eliminate the striation of the lamp.