These two points are of great significance when choosing LED driving power supply
In the LED lighting industry, in fact, there are many engineering and acquisition personnel of lighting manufacturers, and even the company's chief executives, who have a relatively one-sided understanding of LED power skills. In this way, there are great obstacles to choose and buy LED driving power, in addition to the waste of time, energy and manpower, and finally, the phenomenon of product mismatch is futile.
1. Thoroughly understand safety regulations and EMC
Some enterprises tend to pay attention to safety regulations but ignore EMC. As a result, many products "suffer great losses" in EMC and are eventually returned by end customers. Many buyers often just ask if the manufacturer has UL/SAA safety regulations, but they don't know that many manufacturers on the market are asking for UL/SAA safety regulations first, but their products can not actually pass EMC and EMS, that is, they have not passed the mandatory FCC in the United States and C-Tick in Australia.
The reason is that UL/SAA safety regulations are not difficult for manufacturers, because UL certification control is product safety, including insulation, temperature rise, etc., as long as the manufacturer has the relevant documentation support and input costs to meet, basically can be certified. The EMC of FCC/ C-Tick is different. On the one hand, it is more difficult because of the high skill required to deal with the conducted interference, radiated interference and anti-interference of each power supply product. On the other hand, in fact, there are still contradictions between EMC and UL safety regulations, resulting in a long time span required, and EMC quality is contradictory to the power supply, which has a great impact on the temperature rise of the power supply. So, some manufacturers in order to seize market, appeal to "nature" the acquisition of personnel requirements, their UL safety request of the products down first, then do the request of the EMC certification and rectification, once can't pass EMC, even need to make rectification, even very minor changes, that is invalid for UL, not approved. After all, when it comes to the end customers, they cannot pass the inspection and certification of Energy Star and DLC at the same time, and even the products will be returned after they enter the American market and fail to pass the FCC due to the spot check.
Above all, a base of this kind of phenomenon the reason is the United States UL certification is a voluntary request, due to the compulsory certification, but the mall about UL recognition is higher, and the domestic many power supply manufacturer is to seize this loophole, opportunistic, skip the mandatory FCC certification to appeal to the mall "appetite", not the two certification tied together; The European CE and China's 3C certification is different, safety regulations and EMC are mandatory in parallel.
Therefore, do not think that UL is a lofty certification, in fact, there are hidden secrets, especially in the current aggressive and impetuous LED industry, to be particularly careful and careful identification.
2, power and the significance of PFC(power factor)
First, power. It is the ratio of the output power to the active power input. This is a very important parameter of LED driving power supply. The larger the value, the lower the heat of the power supply, which can improve the light efficiency and service life of all lamps and lanterns, and also reduce the electricity cost of the end customers.
The power factor is the ratio of the input active power and the input total power, and a part of the power is not used by electrical equipment called reactive power, the two add up is the total input power. At present, Energy Star has certain requirements on PF, but they are not too strict. In Europe and China, they follow the requirements of traditional lamps and lanterns, and there are specific corresponding requirements until around 25W. A higher PF means a higher power supply utilization rate of the power grid. If the same amount of power is sent, it can be met by a thinner copper wire, so as to save the cost of power generation, which is of great help to the national power grid.