Tips for improving led drive efficiency
We all know that the use of led drives can make lighting fixtures work, but in general, the light effect will be lower and lower with the length of the day. Of course, according to Newton's second law, the object does not move forever. But we can improve the efficiency of led drive power, and better shorten the time of light decay.
The main current loop PCB is as short as possible. The experience and layout of LAYPCB, this is nothing, the quick way is to look at the works of factory.
Optimize transformer parameter design to reduce eddy current losses caused by ringing. This is more difficult. First of all, we must master the basic knowledge of electromagnetics and design a reasonable transformer. The most important thing is patience. Even if we think of improving the efficiency by 0.5%, we must try it.
Reasonable selection of switching devices. This is the balance between cost and performance, what kind of customer requirements, what kind of device to use, but reasonable. If you want efficiency, there is no doubt COOL MOS, low VF output diode.
Input EMI part optimization design If you have passed the safety regulations, this part is more studied, mainly the experience.
Choosing a highly efficient top-up structure This is the beginning of the solution selection, such as PWM and QR PFM. It is necessary to evaluate what kind of topology to choose when presenting the customer's efficiency requirements.
Many people choose this good electrolytic capacitor, and the loss of electrolysis is very large.
Under the premise of high power consumption design, it is necessary to consider that many chips currently have HV start pins, and the starting current is getting lower and lower. This is to learn more about new devices. Of course, there are other circuits. Start up and so on.
We can see the chip-assisted power supply optimization. In the L6562D application documentation of ST, it is pointed out that 15V is the best, but the LED is generally a wide voltage output, so my choice is to add a linear regulator to make the chip work at 15V,Reduce losses.