2014 LED lighting market showed a full-blown trend

The input power supply of every outdoor LED lighting AC terminal must be equipped with an overcurrent protection components, electronic components to prevent inrush current will not lead to the damage of the power line lightning rectifier diode and a back. Although the over-current protection components will be equipped with one or a few lightning protection components (such as MOV, GDT, TVS or semiconductor discharge tube), these components will be a large part of the leakage.

It is observed that in 2014, whether it is home LED lighting, road LED lighting or commercial LED lighting were a full-blown outbreak. Because LED lighting each high quality basically must be equipped with over-current, over-voltage protection components (such as fuses and MOV) and EMI filter components, so the demand through the voltage and the EMI filter around the protected element is synchronous call. The fuse will replace the PTC as the main input power supply overcurrent protection element for every outdoor LED lighting AC terminal must be equipped with an overcurrent protection components, electronic components to prevent inrush current will not lead to the damage of the power line lightning rectifier diode and a back.

Although the overcurrent protection element in front will be equipped with one or several lightning protection components (such as MOV, GDT, TVS or semiconductor arrester), the lightning protection components will release most of the lightning surge current, but there will still be a part of going through the overcurrent protection element to the back of the electronic components. Therefore, the over-current protection element must be able to withstand a high surge current, the surge withstand capacity is very important, because the lightning surge current, the over-current protection element can not be blown. Taking into account the self recovery of PTC can not withstand high current, therefore, the overcurrent protection element can only select the fuse. And in order to ensure that the fuse can withstand lightning surge current, this position needs to have enough i2t or time difference of fuse. In addition, taking into account the volatility or tolerance of AC power, the typical rated withstand voltage of the fuse is as high as 300Vac.

MOV can provide the lowest level of lightning surge protection general outdoor LED lighting drive power AC input will configure a MOV (varistor) for lightning overvoltage protection, lightning surge protection which can provide a minimum level of. Typically, this is a replaceable surge arrester module, which has several configurations in the line neutral thermal protection MOV, a MOV protection mode. Sometimes a GDT will be placed on a common line to prevent the degradation of MOV caused by the earth discharge channel. In addition, it is highly recommended that the customer place an TVS diode on the DC side of the diode rectifier bridge as a further protection for the sensitive LED driver.

Over the past 3 years, PLED shipments have more than 50 million PLED is actually a current bypass diode, when it is in parallel with the LED in normal operation, the PLED remains open state, the system does not feel its presence. But when coupled in parallel LED due to various reasons when open, PLED conduction into the working state. Because of the outdoor LED lighting usually requires a very high power, such as 120W, LED and single power is usually not more than 3W, so the outdoor LED lighting is usually combined by many a string and LED, in order to prevent each LED string not because a LED open to the entire string on the LED are not working properly therefore, LED outdoor lighting must be of high reliability on each string of 1 or several LED parallel PLED. When one or more parallel in the LED series PLED products on excitation, the LED driver will try to maintain a constant drive current, even if the voltage of the LED string is becoming lower, because the PLED in the turn-on voltage condition is lower than the typical LED.