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Output Voltage Increase of a Series Resonant DC-DC Converter
Osamu Matsuo,Hirofumi Matsuo,Yoichi Ishizuka,Koji Kuwahara,Hiroyuki Ota,Katsuhiro Izumi 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
It has been considered that the series resonant converter takes the maximums of the output voltage in the resonant frequency. However, in practice, the series resonant converter takes the maximums of the output voltage that appears in the lower frequency band compared with the resonant frequency. We analyzed the output voltage characteristics of a series resonant converter circuit when the switching frequency is lower than the resonant frequency including the transformer magnetizing inductance from a transformer. As a result, it was confirmed that for the series resonant converter, the output voltage takes maximum at a lower frequency than the resonant frequency, and the output voltage is larger than the input voltage; that is, the converter has the output boost characteristics, and consequently, this converter can be used when the input voltage is varied widely. In addition, the switching frequency is clarified when the output voltage takes the maximum according to the load resistance and magnetizing inductance.
Analysis of the Radiation Noise and Efficiency Characteristics in a Quasi-resonant Converter
Hironobu SHIROYAMA,Hirofumi MATSUO,Yoichi ISHIZUKA 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, the radiation noise and efficiency of the quasi-resonant converter are analyzed. A quasiresonant converter using the flyback topology can realize the soft switching with simpler circuit. However, switching devices with the high withstand voltage is necessary to achieve the complete ZVS and it causes the low power efficiency because a switching device with the high withstand voltage has the high on-voltage. On the other hand, the swithching device with the low withstand voltage and then the low on-resistance can be used with the non-ZVS. Therefore the performance characteristics such as the efficiency and radiation noise are analyzed on the quasiresonant converter with the ZVS and the non-ZVS. As a result, it is clarified that the low radiation noise and high power efficiency are achieved with the non-ZVS.