So for the protection of our LED panel lights which methods should be implemented it?
First, you should determine the choice of a protection circuit and protection devices: we can choose to self- recovery fuse
Also known as self-recovery fuse polymer positive temperature thermistor PTC is a polymer and conductive particles and the like. After special processing, the conductive particles in the polymer chain constituting the conductive path. When the normal operating current through ( or components in a normal ambient temperature ) when, PTC resettable fuse low resistance state ; when the circuit has abnormal over current through ( or ambient temperature ), the large current ( or ambient temperature ) the heat generated by the rapid expansion of the polymer, the conductive particles will cut off a conductive path, PTC resettable fuse high-impedance state ; when the circuit overcurrent ( over-temperature condition ) disappears, the polymer was cooled, the volume is restored normal, wherein the conductive particles form conductive path again, PTC resettable fuse and was initial resistance state. In the normal operating state of self-recovery fuse fever small, abnormal working conditions in its high resistance to heat large, also limits the current through it, and thus play a protective role.
Second, in a specific circuit, there are two ways to use the selection of :
1, the overall protection
In all light beads preceded pick a PTC element, the whole lamp protection. The advantage of this approach is simple, does not account for the volume. We generally use this approach. The household products, this protection results in actual use is satisfactory. Very particular selection of PTC, we are through the very long experiment was worked out a more accurate corresponding values.
2, branch circuit protection
LED lights are generally divided into many series branch. For example 24V voltage, we are using seven LED light bead with a series coupled resistors, current is generally 17 ~ 19mA, we can choose according to need an integer multiple of seven to be combined into a light bead whole lamp. We can at the front of each leg plus a PTC element is individually protected. This approach has the advantage of high accuracy, reliability protection.
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