Stray capacitances of two winding transformers: equivalent circuit, measurements, calculation and lowering
Stray capacitances of two winding transformers: equivalent circuit, measurements, calculation and lowering
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DOI：
10.1109/ias.1994.377552
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发表时间：
1994-10
期刊：
影响因子：
--
通讯作者：
F. Blache;J. Keradec;B. Cogitore
中科院分区：
文献类型：
--
作者：
F. Blache;J. Keradec;B. Cogitore
只要它线性地工作，从静电的观点来看，双绕组Transformer是三端口系统。其电容矩阵包括六个独立的值。因此，无论其形状如何，在等效电路的正确位置引入六个电容允许用户考虑该组件的整个静电行为。利用这样的等效电路，可以计算谐振频率，并且六个电容都可以从测量的谐振频率推导出来。因此，通过手工或通过软件使用该电路，可以预测真实的电子电路的绕组间电流以及与Transformer相关的寄生谐振。在这种全局方法之后，采用微观方法。仔细观察绕组层形状，然后再观察导线形状本身，可以得到两个简单的模型，可以手动计算等效电路的六个电容。找到的值是近似值，但由于分析表达式，可以推断出导致较低电容值的两个设计规则。测量建立的等效电路的可靠性，并评估所提出的设计规则的利益。
As long as it works linearly, a two winding transformer is, from an electrostatic point of view, a three port system. Its capacitance matrix includes six independent values. Consequently, whatever its shape, introducing six capacitances in the right places of the equivalent circuit allows the user to account for the whole electrostatic behaviour of this component. With such an equivalent circuit, resonance frequencies can be computed and, reversely, the six capacitances are all deducible from measured resonance frequencies. Thus, using this circuit by hand or by software, interwinding currents of real electronic circuits can be forecasted together with parasitic resonances related to the transformer. After this global approach, a microscopic approach is adopted. A closer look at the winding layer shape and then, at the wire shape itself leads to two simple models which allow the six capacitances of the equivalent circuit to be computed by hand. Values found are approximate but, thanks to analytical expressions, two design rules leading to lower capacitance values are inferred. Measurements are presented to establish the reliability of the equivalent circuit and to evaluate the interest of the proposed designing rules.>