| 摘要 |
<p>An LED lighting device includes multiple driving states to improve an effective driving voltage range. A first driving stage includes a first luminescent device driven by a first current, a second luminescent device driven by a second current, a path controller for conducting a third current, a first current controller for controlling the first current, and a second current controller for controlling the second current. A second driving stage includes a third current controller for controlling and conducting a forth current. When the first path controller is turned off, the third current is zero and the forth current is the same as the sum of the first current and the second current. When the first path controller is turned on, the first current, the second current, the third current, and the forth current are the same.</p> |
