自适应LED纹波电流抑制电路设计

Design of Adaptive LED Ripple Current Suppression Control Circuit

当前发光二极管(LED)应用范围十分广阔。由于LED驱动器直接连接在220 V/50 Hz的电源上,导致LED容易产生频闪现象,造成人眼不适和使用寿命减小。基于1μm DP2M DNW HVCMOS工艺介绍了一种自适应LED纹波电流抑制电路,通过采样电阻获得输入LED的电流信号,自动调整电容电位,抑制电流纹波,消除了LED频闪现象。仿真结果显示65 mA~900 mA驱动电流的纹波仅为驱动电流的1%~2%。

Today light-emitting diode(LED)has a wide range of applications.Because the LED driver is direct connected to the 220 V/50 Hz power supply,the LED is prone to the strobe phenomenon,which causes discomfortness to the human eye and reduces service life.Based on the 1μm DP2M DNW HVCMOS process,an adaptive LED ripple current suppression circuit is introduced.The circuit obtains the current signal of the input LED through a sampling resistor,adjusts the capacitor potential automatically,suppresses the current ripple,and eliminates the strobe phenomenon.The simulation results show that the ripple is only 1%-2% of the driving current at 65 mA-900 mA.