| 摘要 |
<p>Disclosed in the invention is a LED drive device, which reserves at least one light-declining adjusting line. The LED drive device includes a light-declining adjusting circuit which is used to check electrical level values of the light-declining adjusting line , determine pre-rate, produce and output electrical signals varied monotonically with the increase in accumulation lighting time of LED light source at the pre-rate. The LED drive device also includes a LED driver which is used to produce pulse signals in accordance with electrical signals, control on-off of its own switching tube, and then control to increase output current with the increase in accumulation lighting time of LED light source. Through the aforementioned technical solution, the LED driver can control to increase its own output current with the increase in accumulation lighting time of LED light source, and then realize to increase output luminous flux of LED light source with the increase in accumulation lighting time. Compared with the prior art, the solution does not need to reserve current and conserves resources. Meanwhile the solution can realize light-declining compensation by changing electrical level value of the light-declining adjusting line while the same LED drive device drives LED light sources having different light-declining rates, and improves the device's universality.</p> |
