We first thought was the protection of the LED fuse, the fuse is a one-time, and the reaction speed is too slow, not only the poor actually use a lot of trouble, so the fuse is not appropriate for the finished products of LED household lights are now mainly in the glory of the city engineering and lighting engineering. Actual demand, we have done a lot of experiments, and in accordance with the requirements of the project summed up to have the characteristics of the LED protection circuit, it is very demanding: can start immediately to protect beyond the normal use of current, so that the LED supply pathway was disconnected, the led high bay supplier and power supply can be protected, normal and then throughout the lamp can automatically restore power supply does not affect the LED, the key is because it is a civilian products, added circuit cannot be too complex volume cannot be too large, low cost. These requirements are contradictory, mutually conditioned, it was very difficult to implement.
These reasons will cause the LED current rise abruptly, and soon the LED chips will be burned due to overheating. According to our experience, the majority of the LED burned poles short-circuit, a small part is open circuit. Each LED is about the pressure drop of about 3.2V, and burnt it if the circuit LED strings do not shined. If this short-circuit voltage were transferred to other LED, resulting in greater current of the other LED household lights and other LED will be faster burned, and even critical power. Was little damage on the very easy to cause a big accident. The LED is usually installed in high places, the installation is not easy, even harder to repair. LED household lights protection is the actual demand, but there is not attention, is a lot of frustration there is no way to deal with the problem.