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PARALLEL-RESONANT CONVERTER WITH ZVS-PWM CONTROL
Tamotsu NINOMIYA,Takayoshi HASHIMOTO,Hidekazu TANAKA,Masahito SYOYAMA,Richard P.TYMERSKI 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
A parallel-resonant converter with zero-voltage-switching, pulse-width-modulation (ZVS-PWM) control is proposed Similar to the previously proposed series-resonant counterpart, it has a simple structure and can be controlled at a constant switching frequency using an active-clamp technique The nearly constant current output characteristic of the parallel-resonant converter lends itself beneficially to precisely controlled constant current power supply applications. An experimental breadboard featured an accuracy of ± 1% for an output current of 2A, with an efficiency of 75%.<br/>
Nonlinear Representation of Two-Stage Power-Factor-Correction AC/DC Circuits
Orabi Mohamed,Ninomiya Tamotsu The Korean Institute of Power Electronics 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.4
Two-stage Power-Factor-Correction (PFC) converters are the most common circuits for drawing sinusoidal and in phase current waveforms from an ac source with a good regulated output voltage. The first stage is a boost PFC converter with average-current-mode control for achieving the near-unity power factor and the second stage is a forward converter with voltage-mode control to regulate the output voltage. Stability analysis and design methods of two-stage PFC converters have previously been discussed using linear models. Recently, new nonlinear phenomena have been detected in pre-regulator boost PFC circuits and a new nonlinear model has been proposed for pre-regulated PFC converters. Therefore, investigation of two-stage PFC converters from the nonlinear viewpoint becomes important because the second stage DC/DC converter adds more complexity to the circuit. So, this paper introduces a study of the stability of two-stage PFC converters. A novel nonlinear model of two-stage PFC converters is proposed. Then, a stability analysis is made based upon this nonlinear model. The high correspondence between the simulated and experimental results confirms our analysis.
A Novel Boost-Input Full-Bridge Converter
Takahiro Sonoda,Tamotsu Ninomiya,Satoshi Tomioka,Kei Sato,Hiroto Terashi 전력전자학회 2005 JOURNAL OF POWER ELECTRONICS Vol.5 No.3
In order to correct the power boost topology has been used for easy control. But conventional boost topology has the following drawbacks: switching voltage surge, cross conduction current and right-half-plane zero of its control transfer function. Furthermore, in this topology the output voltage is always higher than the input voltage. As a result, a first-stage boost PFC converter needs to be connected with a second-stage DC-DC converter. A new topology which can be used as single stage PFC converter is proposed in this paper.
Abe, Seiya,Ninomiya, Tamotsu The Korean Institute of Power Electronics 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
This paper compares three kinds of soft-switching circuits from viewpoints of surge suppression, load characteristic, and power efficiency for a tapped-inductor buck converter with low voltage and high current. As a result, these soft-switching techniques have achieved much higher efficiency of 80 % when compared with a hard-switching buck converter for the output condition of 1V and 20A.
Common-mode Noise Reduction in the Watkins-Johnson Converter
Masahito Shoyama,Tamotsu Ninomiya 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Common-mode conducted noise in switching converters frequently causes radiated noise emission from their power code, so it is important to reduce this noise to meet EMC. In this paper common-mode conducted noise is much reduced in the Watkins-Johnson converter by current cancellation. The mechanism of the noise reduction is investigated, and the condition for the noise reduction is obtained by experiments.
Complete Analysis of Steady-State and Efficiency Considerations in a Forward-Flyback Mixed Converter
Yoshito Kusuhara,Tamotsu Ninomiya,Asahi Nakayama,Shin Nakagawa 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a novel DC-DC converter where both forward and Flyback actions are mixed. Previously, we proposed this converter that has prominent features of reducing the voltage of main switch and the current ripple of output inductor, and as a result, the high efficiency and the size reduction were obtained as reported in the previous paper. And, this paper presents that this converter has four operation modes when the turns ratio of the second and the third windings of the transformer is set to be a certain value. Furthermore, these operation modes are analyzed through the extended state-space averaging method, and are confirmed by simulation. These characteristics are shown by means of a three-dimensional graphics method. This paper presents the detailed analyses of static characteristics for the four operation mode used three-dimensional expression of load characteristics with another winding turns ratio by the extended state-space averaging method.
Nonlinear Representation of Two-Stage Power-Factor-Correction AC/DC Circuits
Mohamed Orabi,Tamotsu Ninomiya 전력전자학회 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.4
Two-stage Power-Factor-Correction (PFC) converters are the most common circuits for drawing sinusoidal and in phase current wave forms from an ac source with a good regulated output voltage. The first stage is a boost PFC converter with average-current-mode control for achieving the near-unity power factor and the second stage is a forward converter with voltage-mode control to regulate the output voltage. Stability analysis and design methods of two-stage PFC converters have previously been discussed using linear models. Recently, new nonlinear phenomena have been detected in pre-regulator boost PFC circuits and a new nonlinear model has been proposed for pre-regulated PFC converters. Therefore, investigation of two-stage PFC converters from the nonlinear viewpoint becomes important because the second stage DC/DC converter adds more complexity to the circuit. So, this paper introduces a study of the stability of two-stage PFC converters. A novel nonlinear model of two-stage PFC converters is proposed. Then, a stability analysis is made based upon this nonlinear model. The high correspondence between the simulated and experimental results confirms our analysis.<br/>
Step-One in Pre-regulator Boost Power-Factor-Correction Converter Design
Mohamed Orabi,Tamotsu Ninomiya 전력전자학회 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.1
The output storage capacitor of the PFC converters is commonly designed for the selected hold-up time or the allowed output ripple voltage percentage Nevertheless, this output capacitor is a main contribution factor to the PFC system stability. Moreover, seeking for a minimum output storage capacitor that assures the PFC desired operation under all condition, and providing the advantage of a small size and low cost is the main interesting target for engineering Therefore, in this issue the design steps of the PFC converter have been discussed depending on three choices, output ripple, hold-up time, and stability It is cleared that any design must take the minimum required storage capacitor for stability prospective as step-1 in deign, then apply for any other specification like hold-up time or ripple percentage
A Novel Boost-Input Full-Bridge Converter
Sonoda Takahiro,Ninomiya Tamotsu,Tomioka Satoshi,Sato Kei,Terashi Hiroto The Korean Institute of Power Electronics 2005 JOURNAL OF POWER ELECTRONICS Vol.5 No.3
In order to correct the power boost topology has been used for easy control. But conventional boost topology has the following drawbacks: switching voltage surge, cross conduction current and right-half-plane zero of its control transfer function. Furthermore, in this topology the output voltage is always higher than the input voltage. As a result, a first-stage boost PFC converter needs to be connected with a second-stage DC-DC converter. A new topology which can be used as single stage PFC converter is proposed in this paper.
Seiya Abe,Tamotsu Ninomiya 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper compares three kinds of soft-switching circuits from viewpoints of surge suppression, load characteristic, and power efficiency for a tapped-mductor buck converter with low voltage and high current. Asaresult, these soft-switchingtechniques have achieved much higher efficiency of 80 % when compared with a hard-switching buck converter for the output condition of 1V and 20A.<br/>