Ten key talks LED fluorescent lamp power supply design - (AddTime ：2013-01-02)

At present, the 200W led Flood light fluorescent lamp lighting market is more active, 200W led Flood light drive power supply manufacturer mainly divided into three types:

Do the first kind is the development of 200W led Flood light chips or 200W led Flood light lights factory, to the downstream, the 200W led Flood light power supply circuit know200W led floodlightge and 200W led Flood light fluorescent lamp power know200W led floodlightge is not much;

The second type is the original do do ordinary lighting factory, everyone into a new products field, a little know200W led floodlightge of 200W led Flood light power supply circuit, but not much;

The third kind is completely new factory, before they do power supply or other products or new venture, for the 200W led Flood light power supply some understanding, some is not very understanding.

200W led Flood light fluorescent lamp power supply is one of the 200W led Flood light fluorescent lamp in very important parts, if improper selection, 200W led Flood light fluorescent lamp play out his proper performance, and even may not normal lighting use. Below I will 200W led Flood light fluorescent lamp lighting made some small suggestion, for your reference.

1, why must be constant current 200W led Flood light fluorescent lamp power supply?
Characteristics of 200W led Flood light semiconductor determines its greatly influenced by the environment, such as the temperature increases, the 200W led Flood light current will increase; The increase of the voltage, the current 200W led Flood light will also increase. More than rated current job for a long time, can greatly shorten the service life of the 200W led Flood light . And the 200W led Flood light constant current is in environmental factors such as temperature and voltage change, to ensure the working current is constant.
2, 200W led Flood light fluorescent lamp power to to be matching with the board?
Some customers to design light board, power supply again, find it difficult to have the right power supply, voltage or current is too big, too small (such as I > 350 ma, V < 40 V); Voltage or current is too small, too high (such as I < 40 ma, V > 180 V), the result is caused by heat, low efficiency, or the input voltage range. Actually, choose one of the best string and mode, and the voltage on each 200W led Flood light current is the same, the effect of the power supply, but it can play the best performance. The best way is to communicate with power supply manufacturer, customized.
3, 200W led Flood light fluorescent lamp current of the power supply is how many is the most appropriate?
General 200W led Flood light the rated current of 20 ma, some factories use from the start, design 20 ma, actually the electricity to flow fever is very serious work, by the contrast test many times, designed to 17 ~ 19 ma is ideal, recommend design for 18 ma.
4, how much is the working voltage of the 200W led Flood light fluorescent lamp power supply?
General 200W led Flood light the recommend working voltage is 3.0-3.5 V, the test, and most of the work in 3.125 V, so according to the 3.125 V calculation formula is reasonable. M a lamp bead series the total voltage = 3.125 M Of
5, 200W led Flood light lights series with wide voltage more wide?
To make the 200W led Flood light fluorescent lamp work in input voltage range is wide range (all) AC85 ~ 265 v, the light plate 200W led Flood light series way is very important. Due to the power supply is not isolation type of power supply, when demand wide voltage, output voltage not over 72 v, the input voltage range is can reach 85 ~ 265 v. That is, the serial number is not more than 23 string. Parallel number don't too much, otherwise the working current is too big, fever, recommended for 6 and 8 / and / 12 and. The total current is not more than 240 ma as well. Have a wide voltage scheme, which is first with the L6561/7527 voltage up to 400 v, and then step down, equivalent to two switching power supply, cost twice as expensive, this solution ratio is not high, no market.
6, the series of 200W led Flood light and power factor and the relationship between the wide voltage PFC is what kind of?
Of power supply on the market at present there are three kinds of PFC: one kind is without special PFC circuit, the PFC general around 0.65; One with passive PFC circuit, light board horse well prepared, PFC general around 0.92; Still use a is made of an active active 7527/6561 circuit, PFC can reach 0.99, but the cost is more expensive than the second kind of plan of the project. So the second kind of plan. For passive PFC circuit: also cal200W led Flood light valley type PFC circuit, the working voltage range is half the peak of the ac input voltage. Such as input is 180 v, the peak is 180 * 1.414 = 254 v, half of the peak voltage is 127 v, minus pressure type of differential pressure 30 v, the maximum output is 90 v, so the 200W led Flood light lamp bead series number 28 string. Therefore, to want to get larger power factor, the lamp bead of serial number is not too much, otherwise, just less than the requirements of the low voltage.
7, 200W led Flood light fluorescent lamp power constant current accuracy how many is the most appropriate?
Some poor precision of constant current power supply, on the market like the market popular PT4107 / HV9910 / BP2808 / SMD802 scheme of constant current, + 8% or + 8% error, error of constant current is too large. General requirement in + 3% is ok. According to the error of 3%, and in parallel, each error is about 0.5% of the road, if it is 12 road in parallel, each error about + 0.25%, the precision is enough. Accuracy is too high, the cost will increase greatly. And for the 200W led Flood light , and ma and 17.5 ma.
8, isolation/non - segregation
Commonly isolated power supply such as made 15 w, put inside the 200W led Flood light tube, the transformer size is very big, it is difficult to put in. Especially for T6 / T8 tubes, almost impossible, so the isolation of 15 w, can only do little more than 15 w, and the price is very expensive. So, isolation of not high performance to price ratio, is commonly isolated accounted for more mainstream, can do smaller volume, minimum can be 8 mm high, in fact, not separate safety measures ready, there is no problem.
9, 200W led Flood light fluorescent lamp power supply efficiency
The power output (200W led Flood light the * output current/voltage input power). This parameter is very important, if the low efficiency means that a large part of the input power is converted into heat; If it is instal200W led Flood light inside the tube can produce a very high temperature, plus we 200W led Flood light a efficacy than the send out quantity of heat, can produce higher stack temperature. And we all the power of the internal electronic parts will as the rise of the temperature and shorten the service life. So the efficiency is to determine the power of life is the most fundamental factor, efficiency can't too low, otherwise the cost on the power supply of heat is too big. In more than 80% is ok, however, efficiency and lamp plate matching the relevant law. 10, 200W led Flood light fluorescent lamp power supply size
Height is limited, the main factors are used for the size of the T6 tube/T8 height can't demanding than 9 mm. The height of the T10 tube more than 15 mm. Length can be slightly long, easier to heat dissipation.