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. 03, 2017
Filed:
Sep. 02, 2015
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Masahiro Naruo, Osaka, JP;
Shojirou Kido, Osaka, JP;
Abstract
A visible light communication modulation circuit includes a modulation resistance circuit configured to change a current flowing through an LED light source by changing a resistance thereof, a measurement circuit configured to simultaneously measure a voltage applied to the LED light source and the current flowing through the LED light source at least twice until the current is stabilized, an calculation circuit configured to obtain an equivalent series resistance of the LED light source based on at least two sets of voltage values and current values and determine a target resistance of the modulation resistance circuit based on the equivalent series resistance and a predetermined modulation degree, and a conversion circuit configured to change the resistance of the modulation resistance circuit based on the target resistance.