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. 27, 2009
Filed:
Sep. 06, 2006
Chih-min Hsu, Hsinchu, TW;
Dar-cherng Su, Hsinchu, TW;
Albert Chen, Hsinchu, TW;
Cheng-chieh Ku, Hsinchu, TW;
Jui-liang Wang, Hsinchu, TW;
Charles Huang, Hsinchu, TW;
Chih-Min Hsu, Hsinchu, TW;
Dar-Cherng Su, Hsinchu, TW;
Albert Chen, Hsinchu, TW;
Cheng-Chieh Ku, Hsinchu, TW;
Jui-Liang Wang, Hsinchu, TW;
Charles Huang, Hsinchu, TW;
Integrated Systems Solution Corp., Hsinchu, TW;
Abstract
A charge control system for lithium battery using pulse width modulation is provided, and it detects the existing voltage of the charging lithium battery by a voltage detector and passes this voltage value to a microprocessor preset in the hand-held apparatus. Thus, the microprocessor can decide the applicable charge stage and confirm the status of the charging battery depending on the different Voltage values in real time. Next, the microprocessor controls a control unit by a pulse width modulation signal to modulate the power-source, which comes from an adaptor, as a constant current or a constant voltage to charge the battery. Accordingly, the charge process is completed by repeating the voltage detection and the duty cycle modulation of the control unit.