Wideband Mechanism Model and Parameter Extracting for High-Power High-Voltage High-Frequency Transformers
Wideband Mechanism Model and Parameter Extracting for High-Power High-Voltage High-Frequency Transformers
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DOI：
10.1109/tpel.2015.2464722
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发表时间：
2016-05
影响因子：
6.7
通讯作者：
Chen Liu;Lei Qi;X. Cui;Zhiyuan Shen;Xiaoguang Wei
中科院分区：
文献类型：
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作者：
Chen Liu;Lei Qi;X. Cui;Zhiyuan Shen;Xiaoguang Wei
大功率高压高频变压器（H3T）是研制隔离式大功率dc-dc变换器的关键设备。本文提出了一种宽带机制模型来分析H3T的外部行为。该模型的特点是详细考虑了H3T的磁性和电容效应，包括绕组、磁芯和外壳之间的静电耦合，其参数具有明确的物理含义。针对H3T匝数多、赛道绕组多的特点，采用基于加权算法的有限元法提取模型电感和电容参数。为了验证所提出的模型和相应的参数提取方法，在宽频带上对H3T样机在开路、短路和负载条件下的阻抗特性进行了测量和仿真。实验结果表明，该模型在300khz范围内是有效的。此外，当H3T的一个或两个绕组接地时，由于绕组对地电容的变化，可能会导致谐振频率的移位，因此所提出的模型可能会减少到传统的六个或三个电容模型。所建立的模型和相应的分析有助于H3T的电磁设计和外行为研究。
The high-power high-voltage high-frequency transformer (H3T) is a key equipment to develop the isolated high-power dc-dc converter. In this paper, a wideband mechanism model is proposed to analyze the external behaviors of the H3T. This model is characterized by elaborate considerations on magnetic and capacitive effects of the H3T, including electrostatic couplings between windings, magnetic core, and the enclosure, with parameters which have explicit physical meanings. In terms of large number of turns and racetrack windings of the H3T, a finite-element method based on weighted algorithm is used to extract model inductance and capacitance parameters. To verify the proposed model and corresponding parameter extraction method, impedance characteristics of an H3T prototype under open circuit, short circuit, and load conditions are measured and simulated over a wide frequency band. The results show that the proposed model is valid up to 300 kHz. Besides, when one or two windings of the H3T are grounded, the proposed model may be reduced to traditional six or three capacitance models due to changes of winding-to-ground capacitances, which may account for shift of resonant frequencies. The proposed model and corresponding analyses are helpful to electromagnetic design and external behavior investigations of the H3T.