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Kenya Sakamoto,Masakazu Kanaoka,Hidekazu Muraoka,Ryuhei Hojyo,Mutsuo Nakaoka 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a novel prototype of active voltage clamped quasi-resonant ZVS-PWM forward DC-DC converter designed for specific low voltage high current application. We establish the soft-switching forward converter with a high frequency isolated link which can efficient operate over wide load ranges under conditions of zero voltage soft-switching and active voltage clamped switching. In addition, we evaluate connection of the soft-switching forward converter with large capacitor which capacitance is over 100[F].<br/>
High-Frequency Soft-Switching PWM DC-DC Power Converter for Low Voltage Large Current Applications
Hidekazu Muraoka,Kenya Sakamoto,Mutsuo Nakaoka 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents a novel prototype version of ZCS-PWM forward DC-DC power converter using power MOSFETs which is designed for application specific low voltage large current conversion operation The soft-switching forward power converter with a high frequency isolated transformer link which can efficiency operate over wide load ranges under two conditions of ZCS as well as active voltage clamped switching is evaluated and discussed on the basis of the simulation and experimental results.<br/>
PWM-PDM Controlled Soft-Switching DC-DC Power Converter Operating at Battery Input
Hidekazu Muraoka,Mutsuo Nakaoka,Kenya Sakamoto 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a innovative prototype of PWM soft-switching DC-DC forward type converter designed for specific low voltage large current condition at 24V battery input. To achieve soft-switching, prototype of ZCS PWM DC-DC forward type converter applies additional control mode at partial operating area. The proposed converter is controlled by dual modulation as PWM-PDM at low duty operation. The soft-switching forward converter controlled PWM-PDM dual control scheme which can efficiency operate over wide load ranges under conditions of ZCS and active voltage clamped<br/> switching is established.
채규훈(Gyuhoon Chea),사카모토 켄야(kenya Sakamoto) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
Both accuracy and stability of the clock given by GPS receiver are considered in the range of 1 ppb. And we verified system clock stability of a micro-controller system using the pps pluse supplied by GPS receiver. In complex system of digital processing, the rack of precise timing signal is to cause any accident or breakdown. We introduced VCXO circuit to a micro-controller system to give high accurate clock stability