发明名称 |
Driving circuit for light emitting diode |
摘要 |
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.
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申请公布号 |
US2011128303(A1) |
申请公布日期 |
2011.06.02 |
申请号 |
US20100783056 |
申请日期 |
2010.05.19 |
申请人 |
ROHM CO., LTD. |
发明人 |
YONEMARU MASAO;INOUE NAOKI;ISHIKAWA HIROYUKI |
分类号 |
G09G5/10;G09G3/36;H05B37/02 |
主分类号 |
G09G5/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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