2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)
This paper describes about newly developed 1700V/400A hybrid module which consists of Si-IGBT and... more This paper describes about newly developed 1700V/400A hybrid module which consists of Si-IGBT and SiC-SBD. The static and dynamic characteristics were evaluated and the turn-on loss is 38% lower and the reverse recovery loss is 83% lower than the conventional all-Si IGBT module because of the reverse recovery current of SiC-SBD is very small to be an unipolar device. The radiation noise on hybrid module becomes higher with increasing collector current, but the peak value of the noise from hybrid module is almost same as the all-Si module if the collector current is less than 300A. In AC690V PWM inverter, the total power dissipation of hybrid module is 8% lower at 1 kHz and 29% lower at 10 kHz compare to the all Si module. Therefore the 1700V hybrid module is useful as a power module for an AC690V high efficiency inverter system such as wind power generation system and high voltage solar power generation system. This paper reports about the static and dynamic characteristics and the radiation noise measurement results on the 400A/1700V hybrid module.
Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005.
This paper presents experimental results on an innovative power conversion technology using magne... more This paper presents experimental results on an innovative power conversion technology using magnetic energy recovery switch (MERS) of a wind turbine system with a synchronous generator to improve the output power and the efficiency. An output voltage of the synchronous generator decreases with the increase of current because of synchronous reactance. The MERS, which consists of four MOSFET or IGBT
Energy conservation and reduction in CO2-emissions are key factors in mitigating global warming a... more Energy conservation and reduction in CO2-emissions are key factors in mitigating global warming and preserving our future environment. These positive trends are leading to wider usage of power semiconductors in energy conversion systems supplying the rapidly growing global energy demand. IGBT (Insulated Gate Bipolar Transistor) modules are the most common power semiconductors devices used in industrial, consumer, automotive, and renewable energy systems.
With the recent advances in high-speed power se miconductor devices, the trends toward increased ... more With the recent advances in high-speed power se miconductor devices, the trends toward increased carrier frequencies and smaller-size inverters are advanci ng. High-frequency switching, however, is associated with the problem of high-frequency leakage current flowing through the stray capacitance of the moto r windings to the grounding wire and the problem of EMI (electromagnetic interference). The following three methods are being considered for reducing conduction noise which is a problem in the frequency range of 150 kHz to 30 MHz. (a) Passive method(1): Configured from passive components only. The leakage current is suppressed by inserting passive filter in the common-mode current path. This method has the disadvantages, however, of not enabling a reduction in coil size and of requiring a motor neutral point. (b) Active EMI filter(2): Injects current having an opposite phase from that of the control current source in order to cancel the leakage current to the power supply. When ...
2005 International Conference on Future Power Systems, 2005
... Generation Using a STATCOM: An Experimental Verification M. Molinas, Member, IEEE, S. Vazquez... more ... Generation Using a STATCOM: An Experimental Verification M. Molinas, Member, IEEE, S. Vazquez, Member, IEEE T. Takaku, Member, IEEE, JM Carrasco, Member, IEEE , R. Shimada, Member, IEEE , T. Undeland, Member, IEEE G ... PWM Clark Clark Clark-inv. ba v , Park Park ...
Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)
Advanced application of power-MOSFET to a large capacity novel converter system is studied. Paral... more Advanced application of power-MOSFET to a large capacity novel converter system is studied. Parallel operation of many power-MOSFET elements is investigated in room and liquid nitrogen temperatures. The total on-state resistance shows lowered value in parallel connected and cooled down conditions, and the reduced resistance is effective for operational loss reduction of the converter circuit. The bi-directional switching unit with four power-MOSFET elements is proposed, which can be applied to the self commutated type AC/DC converter. Another type of AC/DC converter using power-MOSFET consists of a three phase synchronous rectifier circuit, which is suitable to output one directional high DC current
In this study, the impact of negative gate voltage (V G(off)) on the turn-off performance of Si-I... more In this study, the impact of negative gate voltage (V G(off)) on the turn-off performance of Si-IGBT device is investigated. In general, the switching energies of the IGBT devices are given at specific V G(off) = −15 V. When estimating the power dissipation of the inverter system at different V G(off) , a correction factor of the switching energies from the given values is required. Although it is known that the value of V G(off) affects the turn-off switching characteristic, it has not been investigated in detail. Hence, it is difficult to theoretically estimate the correction factor for the turn-off energy (E off) for different V G(off) and gate resistance (R G). The effect of V GE(off) on the behavior of collector-emitter voltage (V CE) during the turn-off operation of the IGBT is investigated. The estimation method of E off at different V G(off) and R G is derived from the investigation and theoretical formula confirmed by the experimental results. Then, a novel procedure to estimate the E off correction factor under different gate drive conditions is proposed.
In this article, the resonant switched-capacitor converter (RSCC) is applied to the auxiliary pow... more In this article, the resonant switched-capacitor converter (RSCC) is applied to the auxiliary power system of electric locomotive to improve its efficiency and power density. Phase shift control is generally applied to the RSCC for voltage regulation. But the dead time and parasitic parameters impose the negative effects on the switching transit, the resulted hard-switching process may cause extra switching loss. An optimized soft- switching realized method is proposed under phase shift control. First, transient analysis of resonance is carried out by state trajectory, and steady-state characteristics are discussed. Then, the influence of parasitic parameters on resonant current and output power is discussed. Moreover, the dead-time effect and soft-switching condition are analyzed; therefore, a high-efficiency control strategy with zero-voltage switching is proposed. Experimental results show that the proposed optimization control strategy can improve the efficiency up to 99.4%.
In this paper, a power supply which can generate pulsed high voltage with high repetition rate is... more In this paper, a power supply which can generate pulsed high voltage with high repetition rate is proposed. It can generate pulsed high voltage up to several kilovolts even from several volts dc. This circuit is the Marx-generator which consists of multi-staged magnetic energy recovering switches. A magnetic energy recovering switch is made of four IGBTs and one capacitor. Two IGBTs in reverse-series are connected in anti-parallel. Their terminals are connected to the capacitor. It generates high voltage by absorbing the magnetic energy of an inductor to the capacitor. In order to generate high voltage, this Marx-generator utilizes the inductor. While all the switches are turned on, current flows through the switches and the inductor. When the switches are turned off, the magnetic energy which stored in the inductor is charged in the capacitors in parallel. Next, by turning on the switches, the capacitors discharge in series and high voltage is applied to the inductor. Experiments w...
The experimental results of an innovative power conversion technology using magnetic energy recov... more The experimental results of an innovative power conversion technology using magnetic energy recovery switch (MERS) in a wind turbine system with a synchronous generator to improve the output power and the efficiency are presented. The MERS can compensate for the reactance voltage of the generator. The output voltage of the system increases and the excitation power of the generator can be significantly reduced. The data indicate a great potential of the new power conversion technology to make the actual wind turbine system compact and to improve the efficiency.
2008 20th International Symposium on Power Semiconductor Devices and IC's, 2008
Emergence of new power electronics configurations have historically been one of the important dri... more Emergence of new power electronics configurations have historically been one of the important drivers for improvement of the IGBT technology. Development of new IGBTs is said to be a trade-off between saturation voltage, short-circuit capability and switching losses. With the common applications requiring high switching frequency and short-circuit capability, the saturation voltage performance has not been fully optimized. This paper
21st IEEE/NPS Symposium on Fusion Engineering SOFE 05, 2005
In this paper, a new concept of pulse power supplies that can boost up the pulse current and/or c... more In this paper, a new concept of pulse power supplies that can boost up the pulse current and/or can reduce the voltage rating of the power supplies is proposed. A magnetic energy recovery switch (MERS) consists of four MOSFETs or IGBTs and a capacitor. The MERS is connected in series to a power supply and a coil. The MERS is a switch module and it has no power supply in itself. When the current of coil decrease, the MERS absorbs the magnetic energy stored in the coil and regenerates a high voltage in the capacitor. When the current increases, the MERS adds the voltage to raise currents faster than the time constant of the coil. Because the MERS regenerates a voltage required for the inductance of the coil by using the previous magnetic energy. So, the power supply only has to supply a voltage required for the resistance of the coil. The MERS can reduce a voltage rating and capacity of the power supply. By using the MERS with a power supply of a pulsed magnet, highrepetition pulsed current can be realized with a comparatively small capacity of the power supply. Some applications require a controlled current waveform. By controlling the MERS using PWM, the controlled current waveform is obtained. Operation principles and characteristics of the MERS are described. Some experiments were carried out. Experimental results confirm that the MERS can reduce voltage ratings of power supplies and/or generate high-repetition pulsed boost-up currents.
2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)
This paper describes about newly developed 1700V/400A hybrid module which consists of Si-IGBT and... more This paper describes about newly developed 1700V/400A hybrid module which consists of Si-IGBT and SiC-SBD. The static and dynamic characteristics were evaluated and the turn-on loss is 38% lower and the reverse recovery loss is 83% lower than the conventional all-Si IGBT module because of the reverse recovery current of SiC-SBD is very small to be an unipolar device. The radiation noise on hybrid module becomes higher with increasing collector current, but the peak value of the noise from hybrid module is almost same as the all-Si module if the collector current is less than 300A. In AC690V PWM inverter, the total power dissipation of hybrid module is 8% lower at 1 kHz and 29% lower at 10 kHz compare to the all Si module. Therefore the 1700V hybrid module is useful as a power module for an AC690V high efficiency inverter system such as wind power generation system and high voltage solar power generation system. This paper reports about the static and dynamic characteristics and the radiation noise measurement results on the 400A/1700V hybrid module.
Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005.
This paper presents experimental results on an innovative power conversion technology using magne... more This paper presents experimental results on an innovative power conversion technology using magnetic energy recovery switch (MERS) of a wind turbine system with a synchronous generator to improve the output power and the efficiency. An output voltage of the synchronous generator decreases with the increase of current because of synchronous reactance. The MERS, which consists of four MOSFET or IGBT
Energy conservation and reduction in CO2-emissions are key factors in mitigating global warming a... more Energy conservation and reduction in CO2-emissions are key factors in mitigating global warming and preserving our future environment. These positive trends are leading to wider usage of power semiconductors in energy conversion systems supplying the rapidly growing global energy demand. IGBT (Insulated Gate Bipolar Transistor) modules are the most common power semiconductors devices used in industrial, consumer, automotive, and renewable energy systems.
With the recent advances in high-speed power se miconductor devices, the trends toward increased ... more With the recent advances in high-speed power se miconductor devices, the trends toward increased carrier frequencies and smaller-size inverters are advanci ng. High-frequency switching, however, is associated with the problem of high-frequency leakage current flowing through the stray capacitance of the moto r windings to the grounding wire and the problem of EMI (electromagnetic interference). The following three methods are being considered for reducing conduction noise which is a problem in the frequency range of 150 kHz to 30 MHz. (a) Passive method(1): Configured from passive components only. The leakage current is suppressed by inserting passive filter in the common-mode current path. This method has the disadvantages, however, of not enabling a reduction in coil size and of requiring a motor neutral point. (b) Active EMI filter(2): Injects current having an opposite phase from that of the control current source in order to cancel the leakage current to the power supply. When ...
2005 International Conference on Future Power Systems, 2005
... Generation Using a STATCOM: An Experimental Verification M. Molinas, Member, IEEE, S. Vazquez... more ... Generation Using a STATCOM: An Experimental Verification M. Molinas, Member, IEEE, S. Vazquez, Member, IEEE T. Takaku, Member, IEEE, JM Carrasco, Member, IEEE , R. Shimada, Member, IEEE , T. Undeland, Member, IEEE G ... PWM Clark Clark Clark-inv. ba v , Park Park ...
Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)
Advanced application of power-MOSFET to a large capacity novel converter system is studied. Paral... more Advanced application of power-MOSFET to a large capacity novel converter system is studied. Parallel operation of many power-MOSFET elements is investigated in room and liquid nitrogen temperatures. The total on-state resistance shows lowered value in parallel connected and cooled down conditions, and the reduced resistance is effective for operational loss reduction of the converter circuit. The bi-directional switching unit with four power-MOSFET elements is proposed, which can be applied to the self commutated type AC/DC converter. Another type of AC/DC converter using power-MOSFET consists of a three phase synchronous rectifier circuit, which is suitable to output one directional high DC current
In this study, the impact of negative gate voltage (V G(off)) on the turn-off performance of Si-I... more In this study, the impact of negative gate voltage (V G(off)) on the turn-off performance of Si-IGBT device is investigated. In general, the switching energies of the IGBT devices are given at specific V G(off) = −15 V. When estimating the power dissipation of the inverter system at different V G(off) , a correction factor of the switching energies from the given values is required. Although it is known that the value of V G(off) affects the turn-off switching characteristic, it has not been investigated in detail. Hence, it is difficult to theoretically estimate the correction factor for the turn-off energy (E off) for different V G(off) and gate resistance (R G). The effect of V GE(off) on the behavior of collector-emitter voltage (V CE) during the turn-off operation of the IGBT is investigated. The estimation method of E off at different V G(off) and R G is derived from the investigation and theoretical formula confirmed by the experimental results. Then, a novel procedure to estimate the E off correction factor under different gate drive conditions is proposed.
In this article, the resonant switched-capacitor converter (RSCC) is applied to the auxiliary pow... more In this article, the resonant switched-capacitor converter (RSCC) is applied to the auxiliary power system of electric locomotive to improve its efficiency and power density. Phase shift control is generally applied to the RSCC for voltage regulation. But the dead time and parasitic parameters impose the negative effects on the switching transit, the resulted hard-switching process may cause extra switching loss. An optimized soft- switching realized method is proposed under phase shift control. First, transient analysis of resonance is carried out by state trajectory, and steady-state characteristics are discussed. Then, the influence of parasitic parameters on resonant current and output power is discussed. Moreover, the dead-time effect and soft-switching condition are analyzed; therefore, a high-efficiency control strategy with zero-voltage switching is proposed. Experimental results show that the proposed optimization control strategy can improve the efficiency up to 99.4%.
In this paper, a power supply which can generate pulsed high voltage with high repetition rate is... more In this paper, a power supply which can generate pulsed high voltage with high repetition rate is proposed. It can generate pulsed high voltage up to several kilovolts even from several volts dc. This circuit is the Marx-generator which consists of multi-staged magnetic energy recovering switches. A magnetic energy recovering switch is made of four IGBTs and one capacitor. Two IGBTs in reverse-series are connected in anti-parallel. Their terminals are connected to the capacitor. It generates high voltage by absorbing the magnetic energy of an inductor to the capacitor. In order to generate high voltage, this Marx-generator utilizes the inductor. While all the switches are turned on, current flows through the switches and the inductor. When the switches are turned off, the magnetic energy which stored in the inductor is charged in the capacitors in parallel. Next, by turning on the switches, the capacitors discharge in series and high voltage is applied to the inductor. Experiments w...
The experimental results of an innovative power conversion technology using magnetic energy recov... more The experimental results of an innovative power conversion technology using magnetic energy recovery switch (MERS) in a wind turbine system with a synchronous generator to improve the output power and the efficiency are presented. The MERS can compensate for the reactance voltage of the generator. The output voltage of the system increases and the excitation power of the generator can be significantly reduced. The data indicate a great potential of the new power conversion technology to make the actual wind turbine system compact and to improve the efficiency.
2008 20th International Symposium on Power Semiconductor Devices and IC's, 2008
Emergence of new power electronics configurations have historically been one of the important dri... more Emergence of new power electronics configurations have historically been one of the important drivers for improvement of the IGBT technology. Development of new IGBTs is said to be a trade-off between saturation voltage, short-circuit capability and switching losses. With the common applications requiring high switching frequency and short-circuit capability, the saturation voltage performance has not been fully optimized. This paper
21st IEEE/NPS Symposium on Fusion Engineering SOFE 05, 2005
In this paper, a new concept of pulse power supplies that can boost up the pulse current and/or c... more In this paper, a new concept of pulse power supplies that can boost up the pulse current and/or can reduce the voltage rating of the power supplies is proposed. A magnetic energy recovery switch (MERS) consists of four MOSFETs or IGBTs and a capacitor. The MERS is connected in series to a power supply and a coil. The MERS is a switch module and it has no power supply in itself. When the current of coil decrease, the MERS absorbs the magnetic energy stored in the coil and regenerates a high voltage in the capacitor. When the current increases, the MERS adds the voltage to raise currents faster than the time constant of the coil. Because the MERS regenerates a voltage required for the inductance of the coil by using the previous magnetic energy. So, the power supply only has to supply a voltage required for the resistance of the coil. The MERS can reduce a voltage rating and capacity of the power supply. By using the MERS with a power supply of a pulsed magnet, highrepetition pulsed current can be realized with a comparatively small capacity of the power supply. Some applications require a controlled current waveform. By controlling the MERS using PWM, the controlled current waveform is obtained. Operation principles and characteristics of the MERS are described. Some experiments were carried out. Experimental results confirm that the MERS can reduce voltage ratings of power supplies and/or generate high-repetition pulsed boost-up currents.
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