54 views admin 2020-12-29
LED electronic display screen, the general area is relatively large, the overall power consumption is also relatively large, so it is particularly important to improve the power of the electronic screen. Then, in order to improve the power of LED electronic screen, LED display manufacturers remind that the following problems need to be solved:
1. Reasonable selection of switching devices: This is the balance between cost and performance, what kind of customer requirements, what kind of devices to use, but it must be reasonable. If you want efficiency, no doubt cool MOS, low VF output diode.
2. Choose a good electrolytic capacitor, many people ignore this, electrolytic loss is very big.
3. On the premise that the power consumption design of the start-up part is efficient, we should consider that many chips have HV start-up pins, and the start-up current is getting lower and lower. This is to know more about new devices. Of course, there are external circuits for lossless start-up. I don't think they are suitable for LED drivers.
4. Main current circuit PCB as short as possible: laypcb experience, and layout, this is nothing, the fast way is to see the works of large factories.
5. Optimize the transformer parameter design: reduce the eddy current loss caused by ringing. It is difficult to master the basic knowledge of electromagnetic design. The most important thing to improve the efficiency is to have patience.
6. It is pointed out in the l6562d application document of St that 15V is the best, but LEDs generally have wide voltage output, so my choice is to add a level of linear voltage regulator to make the chip work at 15V to reduce the loss.
7. If the optimized design of the input EMI part has passed the safety regulations, this part is much more elaborate, mainly due to experience.
8. Choosing a high-efficiency topology is the beginning of scheme selection, such as PWM and QR PFM. At present, when customers put forward efficiency requirements, it is necessary to evaluate what kind of topology to choose.
The above 8 tips hope to help the majority of LED consumers.
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