Analyzing the methods for LED street lighting driver puzzle

The isolation circuit is simple, don’t need transformer. MP4000 is also the only one to do the soft switch IC. What is a soft switch? As we all know a power effectiveness depends on loss. Soft switch control of the led driver IC provide efficient solution and do the dimming. First take a look at the MP4000, 1 to 30 w the isolation of the LED street lighting driver. The isolation circuit is simple, don’t need transformer. MP4000 is also the only one to do the soft switch IC.
What is a soft switch? As we all know a power effectiveness depends on loss. Consumption is? Two aspects, one is the conduction losses, the second is switching power supply switch loss, including loss. It has something to do with what? Related to frequency. The general integral switching loss is current and voltage. Traditionally, it is a hard switching and switching loss is relatively large. Because of the voltage and current to go up and cross section. This is a soft switch IC, is how to achieve? As we all know the critical conduction mode, through the electric side, critical import will find voltage mutation, so the detected current flow back, this is the zero current opening mode. Zero current can bring efficiency, such as achieve 90% efficiency compared with competitors, can save the switch losses and conduction losses.
Analytical method for LED lighting driver problems
Other diode part, if it’s CCM hard switching, will need to quickly reverse recovery, but MP4000 this model doesn’t need. Japan’s voltage is 100 vac. MP4005 is simple. One is 190 v, 220 v, the impedance is 4.85 Ω. Control mode is also soft switch technology, so to be able to provide very good efficiency, peripheral device is very simple. This is for the United States and Japan market of isolation. AC – DC resistance loss is bigger. MP4001 SmartLDO direct power supply to the IC. Only within the range of 15 to 30 v voltage can charge, other is blocking, charging time is very short. So SmartLDO can provide loss is very small. If you do the 3 w, 5 w with MP4001 can provide very high efficiency. Do not need PFC unfenced, especially for low power applications. But when a development of more than 8 w power LED street lighting drive, will need to provide the PFC.
MP4020/4021 series is a SingleStagePFC isolation scheme. Comparison with the traditional, can save a lot of cost, and high value of PFC, and it is also a critical conduction mode, conduction loss will be small. That move light tone down and start the bad how to solve if the conduction Angle is cut off a lot of time, start is often a problem, for IC, because of low voltage, light adjustable won’t go down, or there will be flashing. MP4030 provides a good solution.

More info you can visit:http://www.lighting-ledlight.com/