With high efficiency, because life is very long and other functions, LED is more and more popular. At present, the LED is pushing the current lamp types of innovation, and the internal or external lighting for energy conservation and emission reduction made significant contributions. It also appeared in street lighting applications, because of the higher efficiency and reduces the total cost of life (including maintenance) and energy consumption is very important. For these reasons, the power supply for LED lights street lighting power source design must have high efficiency, and the life of at least and LED a, in order to ensure that the service life of the LED in the application of the free maintenance operation.

Presented here is a 130 W reference designs board characteristic and the function, it is suitable for designed for street lighting design LED power supply.

This circuit consists of two level compositions: one is to the front of the ST L6562AT PFC; one is based on L6599AT of ST of resonant converters LLC. The design of the main characteristic is high efficiency (more than 90%), wide input power range (85-305 VAC) work and long-term reliability.

Due to a power supply reliability (two times the average time between fault MTBF) is usually high failure rate by electrolytic capacitors and the influence of the use of very expensive, unless the type, the reference board shows that the most innovative design method. The board of the EPCOS uses film capacitor, not capacitors. In the design stage for components application carefully down the forehead, so reducing the mil-HDBK-217-according to the stress components Suggestions D. Use of ST L6562AT and L6599AT device, new this solution used components number also is minimized, thus increasing the total components, optimize MTBF cost. Because realize efficiency, PFC grade only need a small radiator, and other power components like most passive components just as well as surface mount, so as to reduce the production cost of labor.

The board also can prevent due to particular application by overload or short circuit, every level of open loop or input pressure, after intervention system can automatically to restart.