Development of Soft Multi-Resonant AC/DC Converter without Electromagnetic Pollution

本课题的最终目的是研制一种结构简单、效率高、成本低、无电磁污染的软开关AC/DC变换器。在本研究中，我们的主要工作如下：第一个方案：在不产生电磁污染的前提下，我们开发了一种新型的软开关AC/DC变换器，该变换器只使用一个电容。接下来，我们得到了AC/DC变换器的基本工作原理和特性，如功率因数和失真因数、输出电压及其涟漪比等，在此基础上，我们可以开发出一种新型的软开关AC/DC变换器，该变换器在软开关的情况下，在不连续导通模式和连续导通模式下都具有高功率因数。对于上述新型AC/DC变换器，我们得到了其基本工作原理和特性，如功率因数和失真因数、输出电压及其涟漪比，以上工作已经在IEEJ和IEIC召开的会议上提出，如后页所示。这些AC/DC转换器在世界范围的输入电压（约80至290 V）下存在一个问题。在这种情况下，AC/DC变换器需要特殊的开关元件才能产生4-6倍于输入电压的高压，因此我们针对世界范围内的输入电压类型，研究了其他类型的软开关AC/DC变换器，并找到了一种新的电路。现在我们正在研究这个电路。

The final purpose of our research is development of a soft-switched AC/DC converter which has a simple construction, high efficiency and low cost and no electromagnetic pollution. In this research, we have been planning to clear up as follows:First plan : Not to generate the electromagnetic pollution, we developed a novel soft-switched AC/DC converter by using only one capacitor. Next, we have obtained the basic operating principle and characteristics such as the power factor and distortion factor, output voltage and its ripple ratio.On planning above, we could develop a new soft-switched AC/DC converter with high power factor in the both of discontinuous conduction mode and continuous conduction mode under the soft switching.Second plan: For the above new AC/DC converter, we have obtained the basic operating principle and characteristics such as the power factor and distortion factor, output voltage and its ripple ratio, too.Above works have been presented at the meetings hold by IEEJ and IEIC as shown on back page.These AC/DC converters have one problem for the world-wide input voltage ( about 80〜290 V). In this case, the AC/DC converters need special switch elements in order to generate high voltage of 4-6 times for the input voltage.Therefore we have investigated other type soft-switched AC/DC converter for the world-wide type of the input voltage and have found a new circuit for that. Now we are studying this circuit.