We all know to improve the efficiency of LED drive power The most common is to optimize the design of electronic transformer parameters to reduce the eddy current loss caused by ringing. But in addition to this there is no relevant skills? Now to share with you to improve the efficiency of LED drive power eight skills hope to help everyone.
1. Main current circuit PCB as short as possible. LAYPCB experience, and layout, this is nothing, the quick way is to look at the works of the manufacturers.
2. Optimize the design of transformer parameters to reduce the eddy current loss caused by ringing. This is more difficult, first to master the basic knowledge of electromagnetic, design a reasonable transformer, the most important thing is patience, even if it is expected to improve the efficiency of 0.5%, but also to try.
3. Reasonable selection of switching devices. This is the balance of cost and performance, what kind of customer requirements, what kind of device, but reasonable. If you want to be efficient, there is no doubt that COOL MOS, low VF output diodes.
4. Enter the EMI part of the optimal design If the safety regulations, this part of the elegant study more, the main is the experience.
5. Select the efficient extension of the structure This is the beginning of the program selection, such as PWM and QR PFM, the current customer to mention the efficiency requirements, it is necessary to assess what kind of extension.
6. Choose a good electrolytic capacitor Many people ignore this, the great loss of electrolysis, Chen Yongzhen teacher has a detailed explanation in the article.
7. Start part of the power consumption design efficiency under the premise, we must consider that many chips have HV boot feet, starting current is getting lower and lower, this is to understand the new device, of course, there are plus Circuit lossless start, etc., I think it is not suitable for LED driver.
8. Chip-assisted power optimization This ST-L6562D application documentation has pointed out that 15V is the best, but the LED is generally wide voltage output, so my choice is to add a linear regulator, the chip work in 15V to reduce loss.