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. 15, 2018
Filed:
Feb. 07, 2017
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Shigeru Ido, Osaka, JP;
Abstract
A lighting device includes a rectifier circuit, a drive circuit and a current control circuit. Rectifier circuit rectifies an AC voltage into a pulsating voltage to be output. A load circuit including two or more solid light sources connected in series is connected between output terminals of rectifier circuit. The drive circuit changes a number of solid light sources emitting light, according to a change in a voltage value of the pulsating voltage, so that a period of the pulsating voltage includes: a first time period during which a part of the two or more solid light sources emits light; and a second time period during which all of the two or more solid light sources emit light. The current control circuit controls, in at least the second time period, a value of current flowing through load circuit according to an average voltage of the pulsating voltage.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile