Here special talk about LED
lights with special customization of the three major considerations, for purchasing customer reference: 1, LED lights belt circuit design: LED lamp belt including series circuit and parallel circuit, and the series-parallel circuit.
一个。
Series circuit has the advantage of constant current, easy to control the LED drive current.
The disadvantage is that if one of the LED damage, all leds are not bright, but will not affect other LED life.
b。
Parallel circuit has the advantage of any LED broken does not affect the use of other LED.
Drawback is that if without current limiting resistor, any an LED have damage, can cause other LED on both ends of the current increase, other leds will burn out.
And because a single LED driving voltage is very low, cause most of the voltage made useless, for resource is also a kind of waste.
c。
Series-parallel circuit is one of the LED lamp with a general circuit, because of using leds in series with a group, and other groups in parallel.
Can raise to maximize the utilization of the power supply voltage, reduce the loss of busywork.
At the same time, the use of leds in series, can guarantee the several LED drive current is consistent, is conducive to a LED constant current, in order to ensure the service life of the LED.
After a series of LED headlamp unit and other groups in parallel, can ensure that if a group has damaged, will not affect the normal use of other groups.
At the same time, because each group has a current limiting resistor, therefore, not because of one group of damage and affect the service life of the other groups.
2, LED lights belt every meters lamp bead amount: typically, LED lights with every meters lamp bead amount is fixed.
1210 is 60 lamp, for example, 5050 is 30 lights, special is 60 lamp.
If you have other special requirements, such as 50 metres per lamp, it involves to change circuit.
Because usually LED a group of three, if is 50 lamp, it becomes a group number is not enough, but if become two LED a group of words, will increase the value of current limiting resistor, this will cause the waste of resources.
Doing so, special requirements of LED lights belt, it is important to note that the number of lamp bead is a multiple of 3, voltage so as not to cause the waste of resources.
3, LED lights with shear position: generally speaking, each group is to do a shear position.
But some customers will require a single LED a shear position, that is unreasonable.
Because that would tantamount to a parallel circuit, for the service life of LED lamp belt is no guarantee.
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