共模电感和差模电感
Common mode inductance and differential mode inductance
电源滤波器的设计通常可从共模和差模两方面来考虑。共模滤波器最重要的部分就是共模扼流圈，与差模扼流圈相比，共模扼流圈的一个显著优点在于它的电感值极高，而且体积又小，设计共模扼流圈时要考虑的一个重要问题是它的漏感，也就是差模电感。通常，计算漏感的办法是假定它为共模电感的1%，实际上漏感为共模电感的 0.5% ～ 4%之间。在设计最优性能的扼流圈时，这个误差的影响可能是不容忽视的。
The design of power filter can be considered from common mode and differential mode. The most important part of the common mode filter is the common mode choke. Compared with the differential mode choke, a significant advantage of the common mode choke is that its inductance value is very high, and its volume is small. An important problem to consider when designing the common mode choke is its leakage inductance, that is, the differential mode inductance. Generally, the method of calculating the leakage inductance is to assume that it is 1% of the common mode inductance, in fact, the leakage inductance is between 0.5% and 4% of the common mode inductance. In the design of choke with optimal performance, the influence of this error may not be ignored.