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. 17, 2012
Filed:
Jul. 02, 2009
Chun-hsiung Wang, Taipei County, TW;
Chih-tsung Chen, Taipei County, TW;
Hao-yuan Wang, Taipei County, TW;
Yao-sheng Liu, Taipei County, TW;
Kwan Ho, Taipei County, TW;
Chun-Hsiung Wang, Taipei County, TW;
Chih-Tsung Chen, Taipei County, TW;
Hao-Yuan Wang, Taipei County, TW;
Yao-Sheng Liu, Taipei County, TW;
Kwan Ho, Taipei County, TW;
Cal-Comp Electronics & Communications Company Limited, New Taipei, TW;
Abstract
A driving circuit of a light emitting diode (LED) includes a rectifier unit, a voltage-dividing circuit, a control unit, a voltage converter, a resistance and a capacitor. The rectifier unit rectifies an AC power to generate a first operation voltage. The voltage-dividing circuit generates a voltage-dividing signal. The control unit includes a regulating unit and a pulse width modulation (PWM) unit. An output terminal of the regulating unit is coupled to the PWM unit. The PWM unit outputs a PWM signal. The voltage converter adjusts a driving voltage and a driving current of the LED. The resistance is coupled between an output terminal of the regulating unit and a diode. The capacitor is coupled between a power input terminal of the regulating unit and a ground terminal. The PWM unit adjusts the PWM signal according to the voltage-dividing signal and a feedback signal output by the voltage converter.