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:
Nov. 01, 2011
Filed:
Jun. 04, 2009
Hao-yuan Wang, Taipei County, TW;
Hsien-chung Chen, Taipei County, TW;
Kwan Ho, Taipei County, TW;
Cal-Comp Electronics & Communications Company Limited, New Taipei, TW;
Abstract
A dimmer and a lighting apparatus are provided. The dimmer apparatus includes a rectifier unit, a controller, a voltage divider and a voltage converter. The rectifier unit rectifies an AC power and generates a first operating voltage. The voltage divider outputs a voltage division of the first operating voltage. The controller integrates the voltage division to obtain an average voltage, and provides a pulse width modulation (PWM) signal based on the average voltage. The voltage converter drives a light emitting diode (LED), and adjusts a driving voltage and a driving current of the LED according to the PWM signal. Wherein, the controller also adjusts the PWM signal according to a feedback signal generated by the voltage converter.