LED driver circuit

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9860944
APP PUB NO 20170290111A1
SERIAL NO

15510431

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The purpose of the present invention is to provide an LED driving circuit with which it is possible to easily manage the color temperature by adjusting light. An LED driving circuit, characterized in having: a first LED group in which a plurality of first LEDs are serially connected, the first LED group contributing to emission of light having a first color temperature; a second LED group in which a plurality of second LEDs are serially connected, the second LED group contributing to emission of light having a second color temperature; a third LED group in which a plurality of second LEDs are serially connected, the second LED group contributing to emission of light having the second color temperature; and a control unit for switching, in response to an increase in a rectified output voltage, from illumination of only the first LED group to illumination of only the second LED group and then from illumination of only the second LED group to illumination of the second LED group and the third LED group, the number of first LEDs included in the first LED group being less than the number of second LEDs included in the second LED group.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
CITIZEN ELECTRONICS CO LTD23-1 KAMIKURECHI 1-CHOME FUJIYOSHIDA-SHI YAMANASHI 403-0001
CITIZEN WATCH CO LTDTOKYO JAPAN TOKYO METROPOLIS

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akiyama, Takashi Fujiyoshida, JP 186 1988
Goto, Satoshi Fujiyoshida, JP 118 795
Yamada, Tatsuro Fujiyoshida, JP 28 126

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