Study of parametric oscillation type uninterrupted power supply with EMI reduction capability

本研究的目的是利用作者提出的推挽式参量变压器（push-pull参量Transformer）开发具有EMI降低功能的不间断电源（UPS）。1.推挽式参量Transformer的试验：制作了一台100 V-400 W的推挽式参量Transformer，用于各种试验。实验结果表明，该变换器具有交流电源所需的各种特性。2.参量Transformer的分析：在简单假设的基础上，分析了推挽式参量Transformer的工作机理。分析结果与实验结果吻合较好，说明推挽式参量Transformer具有滤除非线性负载产生的谐波电流的功能。3.推挽式参量Transformer的优化设计：提出了一种参量Transformer的优化设计方法。特别提出了一种结合正交铁心的电路和三维磁路的新分析方法。4.参量振荡型UPS的研制：在此基础上，考虑推挽式参量Transformer应用于UPS的工作特性，取得了良好的效果。5.新应用的开发：在本研究中，作者提出了一种新的应用正交铁芯Transformer的高速无功补偿。实验结果表明，无功补偿器对交流电压的变化具有瞬时调节的作用，本文提出的参数振荡型UPS具有可靠性和容错性，可用作微机电源。此外，在这项研究中成功地展示了一个新的应用。

The purpose of this research is development of the uninterrupted power supply (UPS) with a function of EMI reduction utilizing the push-pull parametric transformer proposed by the anthor. The results obtained by the study in the time of two years are as follows :1.Trial push-pull parametric transformer : The authors made a 100V-400W push-pull parametric transformer for various tests. The experimental results indicate that the converter has various desirable features for ac power supply.2.Analysis of the parametric transformer : Based on a simple assumption, the authors analyze the operating mechanism of the push-pull parametric transformer. The analytical results show a good agreement with the experimental ones, and it is clarified that the push-pull parametric transformer has a function of filtering the harmonic currents generated by nonlinear loads.3.Optimum design of the push-pull parametric transformer : The authors present a method for optimum design of the parametric transformer. In particular, the authors propose a new analysis combined with the electric circuit and 3-dimensional magnetic circuit of the orthogonal-core. The calculated results of the circuit voltage and current agree with accurately with the experimental ones.4.Development the parametric oscillation type UPS : On the basis of the above results, the authors consider the operating characteristics when we applied the push-pull parametric transformer to UPS.Good results are obtained.5.Development of a new application : In this research, the authors proposed a new application of orthogonal-core transformer for high speed VAR compensator. Experimental results that the VAR compensator is useful for regulate instantaneously the variations of the ac line voltage.The parametric oscillation type UPS presented here is useful as power supply for personal computer because of its reliability and fault tolerance. Furthermore a new application is successfully demonstrated in this research.