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On the Distribution of AC and DC Winding Capacitances in High-Frequency Power Transformers With Rectifier Loads Per Ranstad, Member, IEEE, and Hans-Peter Nee, Senior Member, IEEE 有整流负载的高频变压器的直流-交流电容分布 Abstract—In this paper, a method to adjust the ac winding capacitance of high-voltage high-frequency transformers by means of winding–rectifier integration is described. First, a theoretical background to the method is given. From the theory, an equivalent circuit describing the characteristics of the combination of the transformer and the rectifier is derived. The derived circuit introduces the concept of a dc capacitance. Finally, the equivalent circuit and the method itself are verified by means of experiments on a transformer–rectifier system from an industrial application with the ratings 70 kV, 30 kW, and 25 kHz. The results from the experiments show that it is possible to vary the ac component of the winding capacitance from a few percent up to 95% of the total winding capacitance. This means that it is virtually free to choose between ac and dc capacitances during the design stage. This is very important in applications such as resonant converters with transformers having secondary windings connected to rectifiers with capacitive output filters. 在本文中，描述了一种通过绕组整流器整合的方法来调整整流高压高频变压器的交流绕组电容。首先，该方法给出的理论背景。从理论上讲，一个等效电路可以描述组合的变压器和整流特性源。派生电路介绍了直流电容的概念。最后，等效电路和方法本身是通过对变压器–工业应用的额定值70伏，30千瓦，25千赫的整流器系统实验证实。从实验的结果表明，不同的绕组电容的交流分量从百分之几到95%的总的绕组电容是可以实现的。这意味着，在设计阶段可以自由选择的交流和直流电容。这是非常重要的应用，如带谐振变换器的变压器次级绕组连接到带电容性输出滤波器的整流器。 I. INTRODUCTION BIDIRECTIONAL dc–dc converters have important value on theory and application in power conversion fields with bidirectional power flow, such as battery charging and discharging, photovoltaic power supplies system of satellite, electrical vehicles, standby power supplies, etc [1]–[3]. Therefore, much research has been carried out on bidirectional dc–dc converters recently. Especially, there are more problems to be researched and solved in the isolated bidirectional dc–dc converter than non-isolated one [4]–[9]. The purpose of this paper is to make a significant exploratory research on inverter with high-frequency link (HFL) achieved by isolated bidirectional dc–dc converter. Recent researches on inverter with HFL were limited to the dc–dc converter mode and the cyclo-converter mode inverters with HFL [10], [11]. The dc–dc converter mode inverter with HFL has two-stage circuit configuration and no perfect conversion efficiency, thus the cyclo-converter mode inverter with HFL has the features such as the same frequency conversion, surge voltage, and surge current of the cyclo-converter to be difficulty suppressed. Therefore, it is necessary to seek a novel HFL’s inverter with single-stage circuit configuration and higher conversion efficiency.A new idea of HFL’s inverter with single-stage power conversion is proposed in this paper, i.e., differential buck dc–dc chopper mode HFL inverter is proposed and investigated. This kind of inverter will lay a strong technology foundation on new type HFL’s inverting power supply. 双向直流–直流转换器在双向功率流动的领域中有重大的理论和实际的应用，如电池的充电和放电，光伏电源系统的卫星，电动汽车，备用电源，等[ 1 ]–[ 3 ]。因此，最近许多研究已对双向直流-直流转换器进行了研究。特别是，在非孤立的直流-直流变换器要比孤立的直流-直流变换器有更多的问题要研究。本文的目的是使对由双向直流–直流变换器实现的高频链逆变器的一个重要的探索性研究。最近研究有高频链逆变器的研究人员局限于研究直流-直流逆变器的模式和有高频链逆变器的环流逆变器模式。直流直流转换器–源高频环节逆变器具有两级电路结构和不完善的转换效率，因此，交交变频器源高频环节逆变器具有相同的频率转换，浪涌电压，对变频器的浪涌电流是难以抑制的。因此，有必要寻求与单级电路结构和更高的转换效率的一种新的高频链式逆变器。与单级功率变换高频链式逆变器的新概念，本文提出，即，差动降压直流–直流斩波模式提出了高频链式逆变器。这种逆变器将为高频链逆变电源的新型的强大的技术基础。 本文来源：https://www.dywdw.cn/a3bdf262a45177232f60a2a7.html
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2022-03-23
