发明名称 |
Method for controlling light-emitting diodes |
摘要 |
The brightness generated by LEDs in an LED strip is adjusted by pulse-width modulation, wherein the LEDs connected in series are driven temporally offset to one another. If there is a shift in the on-time of at least one LED, a controller inserts at least one additional drive pulse to switch on the LEDs if the interval of the on-times of an LED in the time frame before the shift and in the drive frame after the shift is so large that the interval arising therefrom exceeds a first threshold. Alternatively, the controller reduces at least one drive pulse for switching on the LEDs to curtail the on-time of the LEDs if the interval of the on-times of an LED in the time frame before the shift and in the time frame after the shift is so small that the interval arising therefrom drops below a second threshold. |
申请公布号 |
US9386649(B2) |
申请公布日期 |
2016.07.05 |
申请号 |
US201514598391 |
申请日期 |
2015.01.16 |
申请人 |
Lear Corporation |
发明人 |
Reier Michael;Grebner Klaus-Dieter |
分类号 |
H05B33/08 |
主分类号 |
H05B33/08 |
代理机构 |
MacMillan, Sobanski & Todd, LLC |
代理人 |
MacMillan, Sobanski & Todd, LLC |
主权项 |
1. A method for controlling at least one LED strip including a multiplicity of LEDs connected in series, wherein each of the LEDs is separately connected by a switching element and a controller connects the switching elements for connecting the LEDs by outputting drive pulses, wherein the brightness generated by the LEDs is adjusted by means of pulse-width modulation by changing the ON period of an LED within a drive frame, and the LEDs connected in series are driven temporally offset to one another, the method comprising the steps of:
in the event of a shift in the on-time of at least one LED, the controller inserts at least one additional drive pulse to switch on the LEDs if the interval of the on-times of an LED in the time frame before the shift and in the drive frame after the shift is so large that the interval arising therefrom exceeds a first threshold, and/or the controller reduces at least one drive pulse for switching on the LEDs to curtail the on-time of the LEDs if the interval of the on-times of an LED in the time frame before the shift and in the time frame after the shift is so small that the interval arising therefrom drops below a second threshold. |
地址 |
Southfield MI US |