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. 07, 2014
Filed:
Jun. 29, 2012
Hirokazu Otake, Kanagawa-ken, JP;
Toshihiko Sasai, Kanagawa-ken, JP;
Katsuyuki Kobayashi, Kanagawa-ken, JP;
Hirokazu Otake, Kanagawa-ken, JP;
Toshihiko Sasai, Kanagawa-ken, JP;
Katsuyuki Kobayashi, Kanagawa-ken, JP;
Toshiba Lighting & Technology Corporation, Kanagawa, JP;
Abstract
A power supply for illumination includes a detection circuit and a control circuit. The detection circuit compares an AC voltage whose phase is controlled with a first threshold voltage so as to detect a variation in a conduction state of phase control in the AC voltage, and compares the AC voltage with a second threshold voltage lower than the first threshold voltage so as to detect a zero-cross point of the AC voltage, thereby detecting a conduction period of the phase control. The control circuit outputs an output current according to the duration of the conduction period.