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:
Jul. 20, 2004
Filed:
May. 17, 2002
Larry D. Bradley, San Diego, CA (US);
Kyocera Wireless Corp., San Diego, CA (US);
Abstract
A system and a method are provided for bi-directional power conversion in a portable device. The system uses a single inductor to perform both buck and boost power conversion operations and a controller to supply signals to two switches, enabling electric current paths. The system includes a battery connected to ground and to an inductor terminal. The first switch has a terminal connected to a portable device power bus, a second terminal connected to a second inductor terminal, and an input to accept a control signal. The second switch has a terminal connected to the second inductor terminal, a second terminal connected to a portable device ground, and an input to accept a control signal. Controller inputs accept the bus voltage and the battery voltage and outputs supply power conversion control signals to the switches in response to evaluating the bus and battery voltages. The controller supplies buck power conversion control signals to: close the first switch and open the second switch to build up voltage across the inductor to reduce the voltage supplied to the battery by an external power supply connected to the bus; and to open the first switch and close the second switch to discharge the inductor built-up voltage to the battery. The controller supplies boost power conversion control signals to open the first switch and close the second switch to build up voltage across the inductor and to close the first switch and open the second switch to add the inductor built-up voltage to the voltage supplied by the battery to the bus.