不等宽气隙的多档位电感分析及设计实践

Analysis and Design of a Multi-position Inductor With Unequal Width Air Gap

针对实际需要的电感量按拟合曲线随负载变化的应用需求,通过理论分析和仿真验证,找到一种基于不等宽气隙的设计思路。该方法通过设置不同宽度的气隙,改变磁芯截面,控制局部磁芯的饱和,以得到不同的电感跌落值,从而得到不同电流对应的电感值。首先根据设计需求,对设计思路进行了理论计算分析,明确了工艺和目标参数。其次,设计制造了缩比样机,进行了实验验证和参数测试。实验结果表明,在实际需要的4档电流负载下,对应的电感值与目标值的最大误差在10%以内,满足应用要求,充分证明了设计方法的可行性。

According to the requirements of a multi-position inductor,a design idea by employing unequal width air gap is proposed.Based on theoretical analysis and simulation verification,it shows that different inductance drop val-ues can be obtained by setting different air gaps to change the cross section of the core and control the saturation.First of all,the theoretical modeling and analysis of the design idea are carried out to define the process and target parameters.Secondly,the scaled prototype is manufactured for the experiments and parameter tests.The results show that the maximum error between the corresponding inductance value and the target value is less than 10%under the actual four kinds of current,which meets the application requirements.It illustrates the feasibility of the design idea method..