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:
Mar. 09, 2010
Filed:
Mar. 15, 2006
Jun Makino, Singapore, SG;
Zhongfang Wang, Singapore, SG;
Jun Makino, Singapore, SG;
Zhongfang Wang, Singapore, SG;
Creative Technology Ltd., Singapore, SG;
Abstract
A power supply (V) for an electrical device comprising a transformer (X) having primary and secondary windings. The primary winding is connectable to an AC voltage supply and circuitry on the secondary side is arranged to provide a DC output voltage for the electrical device. The power supply also comprises a switch (—transistors Q& Q) between the primary winding of the transformer and the AC supply, and a rectifier (Diode D) for rectifying the AC voltage. The switch is arranged to switch on at some point as the rectified AC voltage increases, once it has reached a non-zero value, thereby providing a current flow through the primary winding and hence through the secondary winding when the switch (—transistors Q& Q) is switched off. The switch is further arranged to switch off before the rectified AC voltage starts to increase again.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile