用pwm方式调整led灯亮度389（Adjust the brightness of the LED light by 389 in PWM mode）.docVIP

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用pwm方式调整led灯亮度389（Adjust the brightness of the LED light by 389 in PWM mode）.doc

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用pwm方式调整led灯亮度389（Adjust the brightness of the LED light by 389 in PWM mode） PW M implementation of brightness adjustment for LE D lamps The rapid development of LED light technology makes it possible to Former shopping malls decorative lighting, the government bright chemical Procedures, entertainment, decorations, decorations and billboards Pass the field, and gradually enter the family decoration photo Bright, low lighting places and platforms Lamps, bars, LED fluorescent lamps, etc.. Recently, No. Broken LED new products are introduced for lighting replacement Change, especially spherical LED lights and bar LED lights Injection of new technology. Make the LED light gradually replaced The trend of incandescent lamps. In the field of lighting,.LED lamp mature technology The technique is mainly based on constant current drive and PWM drive Now. Constant current drive LED technology is better than technology More mature, due to its fixed brightness pattern, enables the Have to be applied very widely. Their mature discrete components Circuits and dedicated integrated IC are also more numerous. In accordance with Another important application in the field of illumination is the illumination Dimming of a visible device. The dimming of incandescent lamps Road, everyone will be familiar with the idea of SCR Dimming circuit (see Figure L). From the waveform of figure L It is seen that the modulation is the amplitude of the modulated sine wave. This can also be used in LED dimming Dimming mode, but not the essence of LED Fine adjustment. If you want to fine tune the LED light Light, then PWM dimming is an ideal one. In fact, the dimming of.LED can be roughly divided into PWM dimming (including Buck, Boost, Buck)- Boost), linear dimming, and controlled silicon dimming But their common ideas are driven by electricity The path controls the output of light. Some applications are just Jane The functions of open and off are realized in single mode, but More application requireme