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:
Jul. 07, 2015
Filed:
Jun. 16, 2014
Sanken Electric Co., Ltd., Niiza-shi, Saitama, JP;
Mitsutomo Yoshinaga, Niiza, JP;
Sanken Electric Co., Ltd., Niiza-shi, JP;
Abstract
An error amplification circuit amplifies an error voltage between a reference voltage and an output voltage of the LED current sensor. A control circuit controls the DC output power so that the DC output power becomes a predetermined value, by performing on-off control on a switching element based on the output voltage of the error amplification circuit. The error amplification circuit includes an error amplifier, a phase compensation circuit connected between an inverting input terminal and an output terminal of the error amplifier and having a serial circuit of a phase compensation capacitor and a phase compensation resistor, a gain adjustment resistor serially connected at one end to the serial circuit and connected at the other end to the LED current sensor, and a short circuit configured to make the inverting input terminal of the error amplifier grounded for a predetermined period of time after activation.