Invention Grant
- Patent Title: Driving circuit for light emitting diode
- Patent Title (中): 发光二极管驱动电路
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Application No.: US12783056Application Date: 2010-05-19
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Publication No.: US08730228B2Publication Date: 2014-05-20
- Inventor: Masao Yonemaru , Naoki Inoue , Hiroyuki Ishikawa
- Applicant: Masao Yonemaru , Naoki Inoue , Hiroyuki Ishikawa
- Applicant Address: JP
- Assignee: Rohm Co., Ltd.
- Current Assignee: Rohm Co., Ltd.
- Current Assignee Address: JP
- Agency: Cantor Colburn LLP
- Priority: JP2009-120904 20090519; JP2009-123845 20090522; JP2010-068475 20100324
- Main IPC: G06F3/038
- IPC: G06F3/038 ; H05B33/08

Abstract:
A pulse modulator generates a first pulse signal having a duty ratio which is adjusted such that a detection voltage which indicates the electrical state of an LED string to be driven matches a predetermined reference voltage. A first pulse signal is applied to a primary coil of a pulse transformer. A DC/DC converter includes a switching element the ON/OFF operation of which is controlled according to a signal that originates at a secondary coil of the pulse transformer. The DC/DC converter stabilizes an input voltage Vdc, and supplies the input voltage Vdc thus stabilized to the anode of the LED string.
Public/Granted literature
- US20110128303A1 Driving circuit for light emitting diode Public/Granted day:2011-06-02
Information query
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