提高LED灯电源的效率
Improve the efficiency of LED lamp power supply
不管是做限流型恒流控制的电源，还是运放控制的恒流电源，都要解决供电问题。即开关电源芯片工作的时候是需要一个相对稳定的直流电压为其芯片供电的，芯片的工作电流从一个MA到几个MA不等。象FSD200，NCP1012，和HV9910，此种芯片是高压自馈电的，用起来是方便，但高压馈电，造成IC热量的上升，因为IC要承受约300V的直流电，只要稍有一点电流，就算一个MA，也有零点三瓦的损坏耗了。一般LED电源不过十瓦左右，损失零点几瓦一下就可以将电源的效率拉下几个点。典型的象QX9910。用电阻下拉取电，这样，损耗就在电阻上，大约也得损失它零点几瓦吧。
Whether it is the power supply of current-limiting constant current control or the constant current power supply of op-amp control, the power supply problem should be solved. That is to say, when switching power supply chip works, it needs a relatively stable DC voltage to supply power to its chip. The working current of the chip varies from one MA to several MAs. Like FSD200, NCP1012, and HV9910, these chips are SELF-FED by high voltage, which is convenient to use, but high voltage www.bddianlu.com.cn www.jiazanmiaomu.com www.dongwutongdiao.cn www.tongshizii.cn www.renwutongdiao.cn www.tongfoxiangg.cnfeeding causes the increase of IC heat, because IC has to withstand about 300 V DC power, as long as there is a little current, even a MA, also has zero three-watt damage. Generally, the LED power supply is only about ten watts, so the efficiency of the power supply can be reduced by a few watts of loss. Typical like QX9910. Pull down the resistor to get electricity, so that the loss is on the resistor, and you have to lose about a few watts of it.
还有就是磁耦合，就是用变压器，在主功率线圈上加一个绕组，就象反激电源的辅助绕组一样，这样可以避免损掉这零点几瓦的功率。这也是为什么不隔离电源还要用变压器的原因之一，就是为了避免损失那零点几瓦的功率，将效率提几个点。
There is also magnetic coupling, that is, using a transformer to add a winding to the main power coil, just like the auxiliary winding of flyback power supply, so as to avoid losing this zero-watt power. This is also one of the reasons why transformers are not needed to isolate the power supply, in order to avoid losing the zero-watt power and increase the efficiency by a few points.
随着地球温室气体排放问题日益严重，逼近地球自我调节的临界点，各国纷纷出台相关政策，包括中国在内的世界各国政府必需刻不容缓的执行节能减排(二氧化碳)，LED灯是最节能的绿色环保电光源，自然成为照明节能减排的主要选项，随着LED灯成本与价格的逐渐降低，其普及的速度也在加快，在2020年以前，LED灯的市场占有率将超过50%。
With the problem of global greenhouse gas emissions becoming more and more serious and approaching the critical point of self-regulation of the earth, many countries have introduced relevant policies. Governments in the world, including China, must urgently implement energy saving and emission reduction (carbon dioxide). LED lamp is the most energy-saving green environmental protection electric light source, and naturally becomes the main option of energy saving and emission reduction of lighting. With the gradual increase of the cost and price of LED lamp. The speed of its popularization is also accelerating. By 2020, the market share of LED lamps will exceed 50%.