With the development of the led industry, major manufacturers began to turn from miscellaneous. Engineers only need to match the parameters provided by the customer. As for how to match? The following teaches you how to design the lamp.
Now let's take an 18 LED tube as an example to analyze the design ideas:
Then we take the most commonly used 3528 lamp beads as an example. When the LED lamp tube was first introduced, because of the relatively large price space, the lamp band manufacturers used LED chips with high current consistency and high brightness. The current of this type of chip is usually 20mA. ;
First, calculate the power of a lamp bead: 3528 a lamp bead consists of 1 chip, voltage: 3.2V; (parallel circuit: constant voltage, total current added) if it is a good quality LED chip: single The chip current is 0.02A, then the power of a lamp bead is 0.02A×3=0.06W. But the LED chip in the market is in the actual design: the single chip current is designed to be 0.018A (considering the margin), then a lamp The power of the bead is 0.018A×3.2v=0.0576w.
Second, we must first consider whether the lamp is isolated or not. Power W calculation = voltage V × current A, then we can roughly estimate how many lamp beads to be: 18/0.0576=312.5 is about 312
Third, we assume that it is isolated, the general voltage is less than 36v, that is, 36/3 = 12 strings are not isolated, generally set to 24 strings. 312/12=26 and 312/24=13. In this way, we can initially determine two 12-string 26-isolated and 24-string 13 non-isolated solutions.
Fourth, we can choose the driving scheme according to this: First, for this kind of engineer, you can communicate directly with the driver factory, let them adjust the input power to 18w, and tell them the way of your bead string. If you are facing sales, you can tell the current and voltage of the LED driver output as follows: isolation scheme: voltage V=36vI=0.18*26=470MA non-isolated scheme: voltage V=72vI=0.18*13=235MA
Fifth, it is worth noting that the above is an ideal design, but in practice, we often have to consider a lot in design. For example, in terms of cost, first of all, the number of our lamp beads is 312, when the power of the light board has been 18w, the power of the luminaire must be greater than 18w. Therefore, we must consider the efficiency and pf value of the drive: If the power supply is 18w and the pf value is 0.95, the efficiency is 0.85. Then we will design the pcb board according to the power supply.
The method is as follows: the power of the light board = 18 * 0.85 = 15.3w, the number of equal numbers = 15.3w / 0.0576 = 265.6 is about 266, but considering the 12 strings, we have positioned 264 lights. This is another two options: 12 strings 22 and 24 strings 11 and of course it can be 11 strings 24 and 22 strings 12 and all work as long as the voltage of your isolation is less than 36v. This is also a way of thinking about reverse design. It is generally a combination of the two.
This way your work is basically completed, and the rest is just the light board to open this program.
The D-subminiature or D-sub is a common type of electrical connector. They are named for their characteristic D-shaped metal shield. When they were introduced, D-subs were among the smallest connectors used on computer systems.
A D-sub contains two or more parallel rows of pins or sockets usually surrounded by a D-shaped metal shield that provides mechanical support, ensures correct orientation, and may screen against electromagnetic interference. The part containing pin contacts is called the male connector or plug, while that containing socket contacts is called the female connector or socket. The socket's shield fits tightly inside the plug's shield. Panel mounted connectors usually have threaded nuts that accept screws on the cable end connector cover that are used for locking the connectors together and offering mechanical strain relief. Occasionally the nuts may be found on a cable end connector if it is expected to connect to another cable end. When screened cables are used, the shields are connected to the overall screens of the cables. This creates an electrically continuous screen covering the whole cable and connector system.
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Features of ANTENK D-Subminiature Connectors
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Standard Density d-subminiature connectors
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High density d-subminiature connectors, contacts are available as well as several custom and combination versions.
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All d-subminiature connectors may be manufactured with crimp, solder cup, straight PCB and right angle PCB terminations (except solder cup terminations on High Density configurations).
Ragne of of ANTENK D-Subminiature Connectors
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High Density solder cup , stamped & formed contact D-subminiature connectors
Standard Density solder cup, machined contacts D-subminiature connectors
High Density solder cup,machined contacts D-subminiature connectors
crimp & load D-subminiature connectors
IDC D-subminiature connectors
Standard Density vertical mount D-subminiature connectors
High Density vertical mount D-subminiature connectors
Standard Density right angle D-subminiature connectors
High Density right angle D-subminiature connectors
surface mount D-subminiature connectors
Slim D-sub series
D-subminiature connectors stacked D-sub series
D-Subminiature Connectors
Standard Density solder cup, stamped & formed contact,High Density solder cup, stamped & formed contact,Standard Density solder cup,machined contacts,High Density vertical mount,Standard Density right angle,High Density right angle
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