| 发明名称 | LED emitting device and driving method thereof | ||
| 摘要 | Disclosed are an LED emitting device and driving method thereof. The LED emitting device controls an LED drive switch connected to a first end of an LED string to control an output current supplied to the LED string. The LED emitting device generates feedback information on the output voltage or the output current supplied to the LED string, and uses the output current to sense an open lamp state of the LED string. The LED emitting device uses a voltage at a first end of the LED drive switch to sense a change of the LED string to a normal state from the open lamp state. | ||
| 申请公布号 | US9101032(B2) | 申请公布日期 | 2015.08.04 |
| 申请号 | US201313845932 | 申请日期 | 2013.03.18 |
| 申请人 | Fairchild Korea Semiconductor LTD | 发明人 | Kim Jin-Tae;Park Dong Jin;Li Shanmei;Ahn Byunghak;Chenghao Jin |
| 分类号 | H05B33/08 | 主分类号 | H05B33/08 |
| 代理机构 | Perreault & Pfleger PLLC | 代理人 | Tucker Grossman;Perreault & Pfleger PLLC |
| 主权项 | 1. A device for emitting an LED, comprising: an LED string including a plurality of LEDs; an LED drive switch including a first end connected to a first end of the LED string; an LED driver for controlling an output current that is supplied to the LED string by controlling the LED drive switch; and a constant current/constant voltage driver for generating feedback information on an output voltage supplied to the LED string or the output current, wherein the LED driver uses the output current to sense an open lamp state of the LED string, and uses a voltage at the first end of the LED drive switch to sense a change of the LED string to a normal state from the open lamp state, wherein the LED driver senses a change to the normal state from the open lamp state according to a result of comparing the voltage at the first end of the LED drive switch and a normal reference voltage. | ||
| 地址 | KR | ||