Eight aspects, promote efficiency of LED drive power supply

by:MOSO     2020-03-17
About raising the efficiency of LED drive power supply techniques concluded: 1. The main current as far as possible short circuit PCB. LAYPCB experience, and the layout, the nothing important, quick way is to see big work. 2. To optimize the design of the transformer parameters, reduce the eddy current loss on ringing. This is difficult, to grasp the basic knowledge of electromagnetic first, rational design of transformer, patience is the most important thing, even if it is thought that can improve the 0. The efficiency of 5%, also want to try. 3. Reasonable choice switching devices. This is the balance of cost and performance, what kind of customer requirements, with what kind of device, but reasonable. If you want to efficiency, there is no doubt that COOL MOS, low VF output diode. 4. If the safety input EMI part of optimization design, this part more exquisite, mainly is the experience. 5. Choose the efficient topology structure is the beginning of the scheme selection, PWM and QR PFM, for example, when the customer premise, and application efficiency evaluation to choose what kind of topology. 6. Choose good electrolytic capacitor has a lot of people ignored the electrolysis is a big loss, Chen Yongzhen teachers have an article has a detailed explanation. 7. Start some power design under the premise of efficient, consider, a lot of chips have HV to start the feet, also more does more low startup current, it is to find out more about the new components, of course, there are plus start circuit condition, etc. , are not suitable for the LED driver. 8. Chip auxiliary power supply optimization in ST L6562D application documents have pointed out that this 15 v is the best, but the LED and the output voltage for the wide, so my choice is one linear regulator, make the chip work in 15 v to reduce wear and tear.
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