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:
May. 19, 2015
Filed:
May. 20, 2013
Semiconductor Components Industries, Llc, Phoenix, AZ (US);
Keiji Amemiya, Saitama-ken, JP;
Yasuaki Hayashi, Gunma-ken, JP;
SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Phoenix, AZ (US);
Abstract
A charge control circuit includes a comparator circuit to compare a secondary-battery voltage with a comparison voltage corresponding to an input-power-supply voltage, a transistor to supply an input current to an inductor, a first control circuit to control the transistor, and a second control circuit to control second and third transistors to increase and decrease an inductor current, respectively, so that a boost DC-DC converter performs a boost operation. When the secondary-battery voltage is equal to or higher than the comparison voltage, the first and second control circuits turn on the transistor and perform switching of the second and third transistors complementarily, respectively. When the secondary-battery voltage is lower than the comparison voltage, the first control circuit controls the transistor so that the input current takes a predetermined value, and the second control circuit turns on and off the third and second transistors, respectively.