How To Improve The Power Efficiency Of LED Electronic Display
Jul 27, 2021
1, reasonable selection of switching devices: this is the balance of cost and performance, what kind of customer requirements, what kind of devices, but reasonable. If efficiency is needed, there is no doubt that COOL MOS, low VF output diode.
2, choose a good electrolytic capacitor many people ignore this, electrolytic loss is very large.
3, starting part of the power consumption design efficiency of the premise, we should consider, many chips have HV starting foot, the starting current is lower, this is to learn more about new devices, of course, there are additional circuit lossless start, I think it is not suitable for LED driver.
4, the main current circuit PCB as short as possible: LAYPCB experience, and layout, this is nothing, the quick way is to see more works of big factory.
5. Optimize the transformer parameter design: reduce the eddy current loss caused by ringing.
This is more difficult, first to grasp the basic knowledge of electromagnetic, design a reasonable transformer, the most important thing is patience, even if it is to think of improving the efficiency of 0.5%, but also to try.
6, chip auxiliary power supply optimization of this point ST L6562D application documents have pointed out that 15V is the best, but LED is generally wide voltage output, so MY choice is to add a linear voltage regulator, so that the chip work at 15V to reduce the loss
7, the input EMI part of the optimization design if the safety, this part of the more sophisticated, mainly is the experience.
8.This is the beginning of scheme selection, such as PWM and QR PFM. When customers put forward efficiency requirements, it is necessary to evaluate what kind of topology to choose.
