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:
Jun. 04, 2013
Filed:
May. 16, 2011
Kengo Kimura, Niiza, JP;
Mitsutomo Yoshinaga, Niiza, JP;
Kengo Kimura, Niiza, JP;
Mitsutomo Yoshinaga, Niiza, JP;
Sanken Electric Co., Ltd., Niiza-shi, JP;
Abstract
An LED lighting apparatus includes a triac dimmer, a series circuit connected to the triac dimmer and including a primary winding P of a switching transformer T and a switching element Q, the switching transformer having a plurality of windings, a controllerof the switching element, a rectifying-smoothing circuit of a voltage of a secondary winding S of the switching transformer, LEDstoconnected to an output of the rectifying-smoothing circuit, a current detectordetecting a current of the, a voltage detectorconfigured to output a voltage detection signal of a voltage generated at one of the secondary winding when the first rectifying element is ON, the voltage at the secondary winding being proportional to the phase-controlled AC voltage, and an amplifieramplifying a signal that is based on the current detection signal and voltage detection signal for the controller.