Ten key of the LED fluorescent lamp power supply design

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At present, LED fluorescent lighting market is more active, the LED driver power supply manufacturers mainly divided into three types:

The first category is the development of the factory to do the commercial led lighting chip or LED lights, homeopathic, penetrate to the lower reaches of the LED power circuit knowledge and LED fluorescent lamp power of knowledge to understand not;
The second category is the original to do ordinary lighting factory, we are entering a new product areas, the LED power circuit knowledge to understand a bit, but not much;
The third category is a completely new factory, their previous power supply or other products or new business, the LED power supply and some understanding, some are not well understood.

LED power LED fluorescent lamp is a very important component, if improper, LED fluorescent lamp not to play his proper performance, they may even not normal lighting. LED fluorescent lighting some small suggestion for your information.

Why do LED fluorescent lamp power supply must be constant current of it?
The characteristics of the LED semiconductor affected by the environment such as temperature, the LED curren t will increase; increase of the voltage, the LED current will increase. Long-term than the rated current, and will greatly shorten the life of the LED. LED constant current environmental factors such as temperature and voltage changes, to ensure that the operating current constant.

2, LED fluorescent lamp power supply how can match with the light board?
Some of our customers first design the light board, find power, difficult to have appropriate power or too much current, the voltage is too small (for example, with I> 350mA, V <40V); or current is too small, the voltage is too high (such as I < 40mA, V> 180V), the result of severe fever, low efficiency, or the input voltage range is not enough. In fact, choose the best string and then the way added to the voltage and current on each LED is the same, the effect of the power supply was able to play the best performance. The best way to communicate with and power supply manufacturers, tailored.

LED fluorescent lamp power supply current is the most appropriate?
General LED s rated operating current of 20 mA, a start of some factories used to make the design of 20 mA, in fact, this current work under very severe fever, the multiple comparison test, designed to be 17 to 19 mA is The ideal recommended design for the 18 mA.

LED fluorescent lamp power supply voltage is how much?
The recommendation of the general led high bay lighting voltage is 3.0-3.5V, most of the work has been tested and 3.125V, so the calculation according to the 3.125V relatively reasonable. The total voltage of the M series lamp beads = 3.125 * M

LED light board series-parallel and wide voltage how wide?
To make the LED fluorescent work a wide range of input voltage range (full voltage) AC85 to 265V, the light board, LED strings in parallel is very important. Due to the current power is generally a non-isolated buck power, wide voltage is required, the output voltage should not exceed 72V, the input voltage range can reach 85 ~ 265V. In other words, the series no more than 23 string. Parallel number is not too much, otherwise too much current, severe fever, recommended for the 6 and / 8/12. The total current over 240 mA as well. There is also a wide voltage program is use L6561/7527 and voltage elevation to 400V, and then step-down, the equivalent of two switching power supply, and cost twice as expensive, this program cost is not high, there is no market.