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How to improve the power efficiency of LED electronic display?
LED electronic display screens are generally large in area, and the overall power consumption is relatively large, so it is particularly important to increase the power of electronic screens. So, in order to increase the power of LED electronic screens, LED display manufacturer Lianchengfa reminds us that we need to solve the following problems:
1. Reasonable selection of switching devices: This is the balance between cost and performance, what kind of customer requirements, and what kind of devices are used, but it must be reasonable. For efficiency, there is no doubt that COOL MOS, low VF output diode.
2. Choose a good electrolytic capacitor Many people ignore this, and the loss of electrolysis is very large.
3. Under the premise that the power consumption design of the startup part is efficient, it must be considered. At present, many chips have HV startup pins and the startup current is getting lower and lower. This is to understand more about new devices. The circuit is non-destructive, etc. I don't think it is suitable for LED driving.
4. The main current circuit PCB is as short as possible: the experience of LAYPCB and the layout. This is nothing. The quick way is to look at the works of major manufacturers.
5. Optimize transformer parameter design: reduce eddy current loss caused by ringing. This is more difficult. First, you must master the basic knowledge of electromagnetics and design a reasonable transformer. The important thing is patience. Even if you think of improving the efficiency by 0.5%, you must try it.
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6. Chip auxiliary power supply optimization This point in ST ’s L6562D application document states that 15V is ideal, but LEDs generally have a wide voltage output, so my choice is to add a level of linear voltage regulation to make the chip work at 15V to reduce losses. .
7. Optimized design of input EMI part If there are safety regulations, this part is more researched, mainly because of experience.
8. Choosing a high-efficiency topology structure This is the beginning of solution selection, such as PWM and QR PFM. At present, when customers ask efficiency requirements, it is necessary to evaluate what topology to choose.
The above 8 tips are summarized in the work, and I hope it will be helpful to the majority of LED manufacturers.