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:
Jul. 16, 2003
Applicant:
Weiguang Qiu, Albany, CA (US);
Inventor:
Weiguang Qiu, Albany, CA (US);
Assignee:
Analog Microelectronics, Inc., Santa Clara, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H05B037/02 ;
U.S. Cl.
CPC ...
Abstract
Two independent control variables, i.e. the frequency and the duty cycle of the driving waveform to an output driver, can be used to optimize the operation of a cold cathode fluorescent lamp (CCFL). The frequency of the driving waveform can be used to control the gain of a piezoelectric transformer (PZT) in a CCFL circuit. In contrast, the duty cycle of the driving waveform can be used to control the amplitude of the sinusoidal waveform at the PZT input terminal, and thus the current through the CCFL.