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:
Nov. 30, 2010
Filed:
Oct. 17, 2007
Masami Okada, Fukushima, JP;
Masami Okada, Fukushima, JP;
Sony Corporation, Tokyo, JP;
Abstract
A charger includes input terminals whereto positive and negative voltages from a power source unit are applied, output terminals generating an output charging a secondary battery, upon being applied with the voltage from the input terminals via positive and negative power source lines, a first field effect type transistor and a second field effect type transistor having a region between a drain and a source inserted in at least one of the positive and negative power source lines, and having a first parasitic diode with a polarity reverse against charge current, and a second parasitic diode with a polarity forward direction with charge current respectively, a first detection circuit and a second detection circuit having series connections of a plurality of resistors inserted between the positive and negative power source lines, the first circuit is between the input terminals and the first transistor, and the second circuit is between the first transistor and the second transistor, and a charge control unit supplied with the first and second detection voltages, and generates ON/OFF control signals for the gates of the first and second transistors.