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yun yang's Blogs >> yyang LED street lighting power supply design

Compared with the traditional lighting sources can provide higher efficiency and longer life, therefore, the technology is becoming lower indoor or LED Outdoor Lighting manufacturer
energy consumption of the new solution.The requirements with lower cost to achieve greater efficiency and longer life of street lighting system in the same.

Soft is an important characteristic of .But the use of resonant converter body diode can sometimes lead to system failure.Body diode storage charge should be fully released, in order to avoid a large current and voltage peaks, including the topology of high DV / dt and di / dt.Therefore, the MOSFET key parameters (such as Qrr) and reverse recovery DV / dt will directly influence the dynamic performance of the .This paper will discuss LED street lighting is used for switching power supply of the overall solution.The new mode and new power switch are combined together can provide power to provide efficient solutions, while not reducing converter robust and cost-effective.

In this topology, the use of MOSFET body diode to realize zero voltage switching resonant converter, and can achieve higher efficiency.Especially LLC resonant converter, it can at high input voltage and the secondary rectifier low voltage stress condition of obtaining high efficiency, this is because the secondary No.In addition, LLC resonant converter in no load LED tube light china
conditions can guarantee zero voltage switching (ZVS).Zero voltage switching technology to reduce switching losses, while greatly improving efficiency.In addition, the zero voltage switch can effectively reduce switching noise, thus allowing the use of the small size of the electromagnetic interference filter.
Because of these unique properties, including LED LLC resonant converter is becoming the street lighting and many other applications of popular topology.FAN7621S provides for constructing reliable, durable LLC with all the necessary conditions.The device includes a high side gate circuit, precise current oscillator, frequency limit circuit, the soft starting and protection function, so it can simplify the design, to improve productivity.
FAN7621S has multiple protection functions, such as over-voltage and over-current protection (OVP / OCP), abnormal overcurrent protection (AOCP) and internal thermal shutdown (TSD).In view of the LED street lamp lighting system specific application requirements, all the protection LED Industrial Lighting china
has since startup characteristics.High side gate driving circuit has a common mode noise cancellation function, the excellent ability to resist noise can guarantee the system stability.