平面变压器在开关电源中的技术优势

Technique Advantages for Planar Transformers in High Frequency Switching Mode Power Supplies

高功率密度是当今开关电源发展的主要趋势,要做到这一点,必须提高磁元件的功率密度。平面变压器因为特殊的平面结构和绕组的紧密耦合,使得高频寄生参数大大降低,极大地改进了开关电源的工作状态,因此近年来得到了广泛的使用。研究了几种不同的平面结构和绕组制作的方式,介绍了设计平面变压器的一个标准方法,从而使得设计过程变得更加简单,大大降低了设计成本。最后, 比较了平面变压器和传统变压器的一些参数,并给出了设计方针。

The main trend for SMPS development is high power density. In order to achieve it, improving the power density of the magnetic： components in SMPS is a important techniques. Since planar transformers have advantages that improve the SMPS performance, their use is growing in the last year＇s. Some of the high frequency parasitic parameters can be drastically reduced due to their planar geometry and the proximity of the winding. A study of different structures and winding strategies using a standard procedure to build planar transformer is presented. This standard method makes easier and cheaper the transformer construction. Finally, the design guidelines and some experimental results about the different parameters between the traditional transformer and planar transformer are also included.