Now a modern city buildings and are used in led light boxes, light boxes led this effect is very good, this, I believe we are a better understanding of today Xiaobian want to explain it is on led light boxes frontier phase cut dimming control debugging method. In fact, cutting-edge tone led light box light source is using SCR circuit, starting from the AC phase 0, input voltage chopping until the thyristor, the only input. principle led light boxes leading edge dimmer is adjusted each half wave of the alternating current conduction angle to change the sine wave, thereby changing the effective value of the alternating current, in order to achieve the purpose of dimming. led leading edge dimmer light boxes with high regulation accuracy, high efficiency, small size, light weight, easy remote manipulation, etc., was dominant in the market, the majority of manufacturers of products of this type are dimmer. Leading edge phase control thyristor dimmer is generally used as a switching device, it is also known advantages of SCR dimmers FPC dimmer LED lights on are: low light adjustment cost, compatibility with existing lines, without rewiring. FPC disadvantage is poor dimming performance, usually caused by narrow dimming range, and will lead to loads in excess of the minimum requirements for a single or small number of LED lights rated power. Because half controlled thyristor switch of property, only open the current function, but not completely off current, even to the lowest still weak current through the LED micro-current and light emission characteristics, making SCR dimming abound shutdown LED is still weak luminescence phenomenon, has become the current free wiring led light boxes dimming promotion problems. 

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