LED power design points

　　LED power LED lamp is a very important part , if it is selected improperly , LED lamp can not play his performance , even lighting may not work properly . Here I made ??some LED fluorescent lighting small suggestion , for your information .

　　1, LED fluorescent lamp power constant Why must it ?

　　Its characteristics LEDLED lighting has been influenced by the environment , such as temperature, the LED current will increase ; increased voltage , the LED current will increase. Long-term than the rated current work , will greatly shorten the LED life. The LED is constant when environmental factors change such as temperature and voltage , constant current to ensure that their work .

　　2, LED fluorescent lamp power to how we can match the light board ?

　　Some customers design light board , find the power , find it difficult to have a proper power supply, or too much current , the voltage is too small ( eg I> 350mA, V <40V); either current is too small , or the voltage is too high ( eg I < 40mA, V> 180V), resulting in a severe fever , inefficient , or the input voltage range is not enough. In fact , choose a string and pick the best way , plus the voltage and current on each LED is the same, but the effect of the power supply was able to play the best performance. The best way is to communicate and power supply manufacturers , tailored.

　　3, LED fluorescent lamp power supply current is how much work is the most appropriate?

　　General LED rated operating current 20 mA , and some plants are used to make the outset , design 20 mA , in fact, this current work under very severe fever , after numerous comparison test , designed to be 17 to 19 mA is relatively an ideal design for the recommended 18 mA.

　　4, How much LED fluorescent lamp power supply operating voltage?

　　General LED 's recommended operating voltage is 3.0-3.5V, tested, most of the work at 3.125V, 3.125V calculated according to the formula is so reasonable . M lamp beads series total voltage = 3.125 * M

　　5 , series-parallel LED light board with wide voltage How wide do you want ?

　　For LED lamp in a relatively wide range of input voltage range ( full voltage ) AC85 ~ 265V, the light board parallel LED strings is very important . Due to the current power generally non -isolated step-down power , wide voltage requirements , the output voltage does not exceed 72V, the input voltage range of 85 ~ 265V can be reached . That is, the serial number no more than 23 strings. Do not count too much in parallel , otherwise the operating current is too large, severe fever , and is recommended for 6 /8 and / 12 and . Total current does not exceed 240 mA as well. There is also a wide voltage solution which first with L6561/7527 and raise the voltage to 400V, then the buck , the equivalent of two switching power supplies, which costs twice as expensive , this program cost is not high , there is no market .