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:
Oct. 21, 2008
Filed:
May. 17, 2005
Pat Y. Mah, Kowloon, HK;
Pat Y. Mah, Kowloon, HK;
Abstract
A switching mode power supply uses two power source inputs, an alternating current input and a direct current input. A pulse width modulation controller is used to control current from two primary windings of a transformer. The secondary of the transformer has a rectified direct current output. From the direct current output a current/voltage comparator receives a signal across a sensing resistor and through an inverter and in parallel with respect to the direct current output. The current/voltage comparator may communicate through an opto coupler/isolator and then to a pulse width modulation controller. Instructions are received about the voltage and current necessary to be supplied by the direct current output of the power supply from an internal, circuit board mounted selecting network. The selecting network can be resistive, digital, fiber optical, black and white, or color.