EPE Association: EPE 2023 - DS2f: Converter Design and Optimisation

EPE 2023 - DS2f: Converter Design and Optimisation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 03: Measurement and Control > EPE 2023 - DS2f: Converter Design and Optimisation

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   30 kW Three-Phase T-Type Active Front End 3D Electro-thermal Design
By Hakan POLAT, Gamze EGIN MARTIN, Thomas GEURY, Mohamed EL BAGHDADI, Omar HEGAZY [View]
[Download]

Abstract: In this paper, a 30 kW three-phase T-type active front end (AFE) topology is presented and the effect of layout on the parasitic inductance and thermal performance is assessed for modular off-board charging systems. According to the operation time, a mean time between failure (MTBF) is calculated for the variation of junction temperature. According to the analysis the peak junction temperature is calculated as 80_C. In order to find a compromise between cooling and layout, a parametric study is performed in ANSYS Q3D for 3 different layouts with different semiconductor distances. The cooling system is then designed and several analyses are performed to achieve the layout with minimal parasitic inductance while satisfying the system lifetime key performance indicator. Finally, the layout Case2A with 10mm semiconductor separation is selected as the optimal design. The parasitic loops are calculated as 33.9 nH and 43.7 nH for the upper and lower loop, respectively. The peak junction temperature is calculated as 76.7_C which is slightly below the thermal limit.

   An Intelligent Hybrid Fractional Order Controller for DC-DC Buck Converters Feeding Constant Power Loads
By Hoda SOROURI, Soroush OSHNOEI, Arman OSHNOEI, Remus TEODORESCU, Frede BLAABJERG [View]
[Download]

Abstract: This paper proposes a hybrid fractional order controller to regulate the output voltage of a DC-DC buck converter. An artificial neural network is proposed to provide online correction for controller gains, passing the control system's reliance on operating point conditions. Real-time validations are provided to demonstrate the proposed method's effectiveness.

   Application and control strategy of a novel three-port converter for renewable hybrid energy storage system
By Jinxin LIU, Da KANG, Yingnan REN, Wenli YAO, Xiaobin ZHANG [View]
[Download]

Abstract: In this study, a hybrid energy storage system (HESS) configuration based on a three-port converter (TPC) which combine supercapacitor (SC) and battery is proposed to satisfy the requirements of compensating high impulse fast charging load. The prototype is developed and tested to verify the performance of the proposed TPC-based HESS. The experiment results prove that the proposed HESS configuration achieves high stability performance, lower cost and easy application to DC microgrid.

   Comparative Analysis of Series Connected MOSFETs with Single Switch for ZVS Turn On Converter Topology
By Pooja SINHA, Sachin YADAV, Zian QIN, Pavol BAUER [View]
[Download]

Abstract: Series-connected MOSFETs with lower voltage ratings can be an alternative for single high-voltage switches. In this paper, we provide a comparison of two switch configurations for soft switched power converter topology targeted for 1400V DC grid. The first configuration is a single switch rated at 1700V whereas, the other is a series connected two MOSFETs rated at 900V. A buck converter with 1400V and 700V as input and output voltages respectively is taken as a case study. Triangular current modulation (TCM) is used to ensure zero voltage switching (ZVS) at turn-on for all the switches. The analysis shows that the series switch configuration can have much lower overall losses than the single switch configuration.

   Comparison of Increasing Efficiency in DAB Converters using EPS, DPS and TPS with Evolutionary Algorithms
By Erdem AKBOY, Akiner ESTURK [View]
[Download]

Abstract: Dual Active Bridge (DAB) converters are widely used in energy storage systems and electrical vehicle applications due to providing isolation and bidirectional power flow. However, recycling energy causes additional losses and minimum efficiency. So, there are phase shift control techniques to minimize recycling energy and increase efficiency. In this paper, nature-inspired evolutionary algorithms which are Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) are used to determine the optimum phase shift ratios in search space.

   Comprehensive Multi-Stage Filter Design of an Active Three-Phase Two-Level Rectifier for Aircraft Application
By Robin WEISS, Sebastian RODE, Normann SCHWINGAL, Steffen BERNET [View]
[Download]

Abstract: The variable frequency power supply and associated regulations of modern aircraft pose a challenge to the design of passive filters for rectifier topologies. Focusing on power density a straight-forward design method, omitting complex optimization algorithms, is presented to derive a passive multi-stage filter design for a bidirectional three-phase two-level rectifier system.

   Demonstration of a Medium-Voltage DC-Chopper Enabled by 10 kV SiC MOSFETs
By Zhixing YAN, Gao LIU, Dipen DALAL, Jonas JACOBSEN, Rui WANG, Michael BECH, Bjørn RANNESTAD, Hongbo ZHAO, Stig MUNK-NIELSEN [View]
[Download]

Abstract: The DC-chopper is a common component in back-to-back converter systems, connected in parallel to the DC bus. As the system voltage increase to the medium-voltage level, different solutions involving series-connected DC-choppers have been proposed. To simplify the topology and associated circuits, a medium-voltage DC-chopper enabled by 10 kV SiC MOSFETs is demonstrated in this paper.

   Design and Optimization of an Integrated Modular Motor Drive for LowVoltage High Power Permanent Magnet Synchronous Motor
By Alexandre SICCARDI, Charles JOUBERT, Christian MARTIN, Ali MAKKI [View]
[Download]

Abstract: This paper presents a design of an Integrated Modular Motor Driver (IMMD) for an openwinding permanent magnet synchronous motor (OW-PMSM). A losses calculation method to validate both electrical and thermal design is proposed. Loss calculation method takes account of losses in both transistors and conductors. Obtained calculation results are compared with experimental results to validate the proposed losses calculation method. Observed losses discrepancy between the proposed method and experimental measurements is 3.6 \%. Maximum efficiency of IMMD prototype is measured at 97 \% for an output power of 1.63 kW.

   Design Optimization of a Three-Level Neutral-Point-Clamped Traction Inverter for Electric Vehicles based on Switching-Cell Arrays
By Roya RAFIEZADEH, Sergio BUSQUETS-MONGE, Salvador ALEPUZ, Gabriel GARCIA-ROJAS, Germán FAÑANÁS PUIGJANER [View]
[Download]

Abstract: This article explores the optimal or near-optimal design configuration of a three-level neutral-point-clamped traction inverter for electric vehicles based on switching-cell array devices.From the definition of a suitable design optimization problem taking into account efficiency, reliability, and simplicity, the optimal solution for the leg configuration and operation isobtained under different scenarios and operating conditions. It is concluded that, in each case, themain operating conditions may decisively influence the selected design.

   Influence of the r\_{ds,on} temperature dependency of SiC MOSFETs on the optimal switching cell mechanical layout
By Georgios PAPADOPOULOS, Jürgen BIELA [View]
[Download]

Abstract: The design of power electronic systems is typically performed based on optimisation procedures. Inthis paper, the influence of the temperature dependant on-state resistance on the optimal switching cell mechanical layout is investigated. A standardised half-bridge switching cell is modelled and optimised to discuss the importance of establishing general layout recommendations.

   Optimization of Temperature Sensor Placement in Multi-Chip Power Modules Using Frequency Domain Analysis
By Usama AZHAR, Alireza AGHDAEI, Rik W. DE DONCKER [View]
[Download]

Abstract: Accurate real-time temperature measurement is crucial for monitoring power modules, particularly in critical applications. Embedded temperature sensors, such as negative-temperature coefficient (NTC) thermistors, are commonly utilized for this purpose. The arrangement of these sensors plays a pivotal role, as the accuracy of measurements relies on their placement. This paper presents a new methodology for optimally placing temperature sensors in multi-chip power modules for improved temperature estimation. The optimum sensor arrangement is achieved by introducing the frequency bandwidth as a new optimization parameter and maximizing it based on the number of sensors. The efficacy of this methodology is demonstrated using one multi-chip power module, and the optimal sensor locations are validated for average temperature over an actual mission profile. Compared to the original NTC location, significant improvements are observed at the predicted optimal locations.

   Paralleling SMD Semiconductor Switching Cells in a Flying Capacitor Converter System
By Daniel CHRISTEN, Mario SCHWEIZER, Hemant BISHNOI, Milos STOJADINOVIC, Sami PETTERSSON, Francisco CANALES [View]
[Download]

Abstract: In this paper, the parallel arrangement of SMD semiconductor devices for example in a flying capacitor topology is addressed. A concept of alternating arranged switching cells is proposed, in which the magnetic field is naturally cancelled. This enables a proper current sharing in the devices during the switching transition, which is shown by measurements. This concept is applicable for any parallel arrangement of semiconductor devices to improve the current sharing also in dynamic cases as e.g. theswitching transitions.

   Performance Assessment of the Adjustable Hybrid Switch Converter for E-mobility Applications
By Tanya THEKEMURIYIL, Munaf T.A. RAHIMO, Renato Amaral MINAMISAWA, Silvia MASTELLONE [View]
[Download]

Abstract: An Adjustable Hybrid Switch (AHS) converter for electric vehicles (EV) is realized, configured, and operated to optimize the inverter performance over the whole driving profile. The AHS concept equips the EV with an 'Electronic Gear' functionality by online configuring the Cross-Switch (XS) hybrid power converter. The semiconductors in parallel are individually operated according to an optimization-based control algorithm to attain an increase of efficiency above 4\% with respect to a conventional Si IGBT converter. The Adjustable Hybrid Switch is most effective in applications like electric vehicles where the converter operates mostly in sub-load conditions.

   Power Loop Inductance Optimization Strategy for Eliminating Turn-off Switching Surge for GaN-HEMT Switching Device
By Kazuhiro UMETANI, Kento TANOHARA, Koki ABE, Masataka ISHIHARA, Eiji HIRAKI [View]
[Download]

Abstract: The gallium nitride high electron mobility transistors (GaN-HEMTs) are increasingly applied for high-power switching converters. However, their fast switching in high-power applications tends to generate enormous switching surges at the turn-off, which may destroy the switching device. This problem can be mitigated by optimizing the wire structure to minimize the power loop inductance, although satisfactory reduction of this inductance is difficult in many practical designs. This paper address this issue by optimizing the power loop inductance rather than seeking the entire elimination of this inductance. This paper analytically elucidates the existence of the optimal power loop inductance that ideally generates no turn-off surge with fast-switching GaN-HEMTs. An experiment supported the analytical result, suggesting the optimal design of power loop inductance is promising for the power module design of GaN-HEMTs.

   Power Losses Reduction of Parallel Connected Power Electronics Devices
By Essam HUSSAIN, Bin LIU [View]
[Download]

Abstract: Due to the increase in the power rating of power converters' applications and the limitation of the power electronics devices' capability in terms of voltage and current rating, parallel-connected power electronics devices are one of the solutions to overcome this limitation. In this paper, two control techniques to control parallel connection power electronics devices are presented. The main idea is controlling the active time of each power electronics device according to the load current. The number of connected devices depends on the load current and the current ratingof the devices. Therefore, the switching losses of the power electronics devices will be reduced. This offers a reduction in the total power losses and the power electronics devices can be arranged for better thermal management. Simulation results show an 8-10\% reduction in power electronics losses and up to 100C reduction in the temperature of the hot spot point.

   Reduce Order Modeling of the modular multilevel DC/DC converter (M2DC) for HVDC grid
By Ghazala SHAFIQUE, Johan BOUKHENFOUF, François GRUSON, Shabab SAMIMI, Philippe DELARUE, Philippe LE MOIGNE, Frédéric COLAS, Michael MERLIN, Xavier GUILLAUD [View]
[Download]

Abstract: The Modular Multi-Level DC-DC Converter (M2DC) is an attractive non-isolated DC-DC converter topology for HVDC grid. In order to carry out MTDC grid stability studies, the development of reduce order models of converters is necessary. This article first presents the M2DC converter. Then, the reduce order model will be developed in the second part. The development of the control of this model will be carried out in the third part. Atlast, the comparison of the reduce order model and its control with the average arm model will be performed in the later section of the paper.

   Self-Oscillating Drive Circuit Using Cascode-Connected Normally-on Device and Normally-off Device for Self-Powered Active Bridges
By Yoshihiro MIWA, Hiroyuki SHOJI, Junichi SAKANO [View]
[Download]

Abstract: Self-powered active bridges have the same number of external terminals as diode bridges, and they can improve the efficiency of conventional PFC boost rectifiers that come with a diode bridge for line rectification. However, bulk capacitors required for accumulating energy to drive rectification MOSFETs cause increase in the mounting area of drive circuits. This paper proposes a novel self-oscillating drive circuit, in which two pairs of cascode-connected a high-breakdown voltage normally-on device and a low-breakdown voltage normally-off device are used as the lower-arm rectification switches, to reduce the number of bulk capacitors. The operation of the proposed drive circuit was verified experimentally, and the efficiency of a 2.4 kW PFC boost rectifier that comes with the proposed drive circuit was measured.

EPE 2023 - DS2f: Converter Design and Optimisation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 03: Measurement and Control > EPE 2023 - DS2f: Converter Design and Optimisation
	[return to parent folder]

	30 kW Three-Phase T-Type Active Front End 3D Electro-thermal Design By Hakan POLAT, Gamze EGIN MARTIN, Thomas GEURY, Mohamed EL BAGHDADI, Omar HEGAZY	[View] [Download]
Abstract: In this paper, a 30 kW three-phase T-type active front end (AFE) topology is presented and the effect of layout on the parasitic inductance and thermal performance is assessed for modular off-board charging systems. According to the operation time, a mean time between failure (MTBF) is calculated for the variation of junction temperature. According to the analysis the peak junction temperature is calculated as 80_C. In order to find a compromise between cooling and layout, a parametric study is performed in ANSYS Q3D for 3 different layouts with different semiconductor distances. The cooling system is then designed and several analyses are performed to achieve the layout with minimal parasitic inductance while satisfying the system lifetime key performance indicator. Finally, the layout Case2A with 10mm semiconductor separation is selected as the optimal design. The parasitic loops are calculated as 33.9 nH and 43.7 nH for the upper and lower loop, respectively. The peak junction temperature is calculated as 76.7_C which is slightly below the thermal limit.

	An Intelligent Hybrid Fractional Order Controller for DC-DC Buck Converters Feeding Constant Power Loads By Hoda SOROURI, Soroush OSHNOEI, Arman OSHNOEI, Remus TEODORESCU, Frede BLAABJERG	[View] [Download]
Abstract: This paper proposes a hybrid fractional order controller to regulate the output voltage of a DC-DC buck converter. An artificial neural network is proposed to provide online correction for controller gains, passing the control system's reliance on operating point conditions. Real-time validations are provided to demonstrate the proposed method's effectiveness.

	Application and control strategy of a novel three-port converter for renewable hybrid energy storage system By Jinxin LIU, Da KANG, Yingnan REN, Wenli YAO, Xiaobin ZHANG	[View] [Download]
Abstract: In this study, a hybrid energy storage system (HESS) configuration based on a three-port converter (TPC) which combine supercapacitor (SC) and battery is proposed to satisfy the requirements of compensating high impulse fast charging load. The prototype is developed and tested to verify the performance of the proposed TPC-based HESS. The experiment results prove that the proposed HESS configuration achieves high stability performance, lower cost and easy application to DC microgrid.

	Comparative Analysis of Series Connected MOSFETs with Single Switch for ZVS Turn On Converter Topology By Pooja SINHA, Sachin YADAV, Zian QIN, Pavol BAUER	[View] [Download]
Abstract: Series-connected MOSFETs with lower voltage ratings can be an alternative for single high-voltage switches. In this paper, we provide a comparison of two switch configurations for soft switched power converter topology targeted for 1400V DC grid. The first configuration is a single switch rated at 1700V whereas, the other is a series connected two MOSFETs rated at 900V. A buck converter with 1400V and 700V as input and output voltages respectively is taken as a case study. Triangular current modulation (TCM) is used to ensure zero voltage switching (ZVS) at turn-on for all the switches. The analysis shows that the series switch configuration can have much lower overall losses than the single switch configuration.

	Comparison of Increasing Efficiency in DAB Converters using EPS, DPS and TPS with Evolutionary Algorithms By Erdem AKBOY, Akiner ESTURK	[View] [Download]
Abstract: Dual Active Bridge (DAB) converters are widely used in energy storage systems and electrical vehicle applications due to providing isolation and bidirectional power flow. However, recycling energy causes additional losses and minimum efficiency. So, there are phase shift control techniques to minimize recycling energy and increase efficiency. In this paper, nature-inspired evolutionary algorithms which are Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) are used to determine the optimum phase shift ratios in search space.

	Comprehensive Multi-Stage Filter Design of an Active Three-Phase Two-Level Rectifier for Aircraft Application By Robin WEISS, Sebastian RODE, Normann SCHWINGAL, Steffen BERNET	[View] [Download]
Abstract: The variable frequency power supply and associated regulations of modern aircraft pose a challenge to the design of passive filters for rectifier topologies. Focusing on power density a straight-forward design method, omitting complex optimization algorithms, is presented to derive a passive multi-stage filter design for a bidirectional three-phase two-level rectifier system.

	Demonstration of a Medium-Voltage DC-Chopper Enabled by 10 kV SiC MOSFETs By Zhixing YAN, Gao LIU, Dipen DALAL, Jonas JACOBSEN, Rui WANG, Michael BECH, Bjørn RANNESTAD, Hongbo ZHAO, Stig MUNK-NIELSEN	[View] [Download]
Abstract: The DC-chopper is a common component in back-to-back converter systems, connected in parallel to the DC bus. As the system voltage increase to the medium-voltage level, different solutions involving series-connected DC-choppers have been proposed. To simplify the topology and associated circuits, a medium-voltage DC-chopper enabled by 10 kV SiC MOSFETs is demonstrated in this paper.

	Design and Optimization of an Integrated Modular Motor Drive for LowVoltage High Power Permanent Magnet Synchronous Motor By Alexandre SICCARDI, Charles JOUBERT, Christian MARTIN, Ali MAKKI	[View] [Download]
Abstract: This paper presents a design of an Integrated Modular Motor Driver (IMMD) for an openwinding permanent magnet synchronous motor (OW-PMSM). A losses calculation method to validate both electrical and thermal design is proposed. Loss calculation method takes account of losses in both transistors and conductors. Obtained calculation results are compared with experimental results to validate the proposed losses calculation method. Observed losses discrepancy between the proposed method and experimental measurements is 3.6 \%. Maximum efficiency of IMMD prototype is measured at 97 \% for an output power of 1.63 kW.

	Design Optimization of a Three-Level Neutral-Point-Clamped Traction Inverter for Electric Vehicles based on Switching-Cell Arrays By Roya RAFIEZADEH, Sergio BUSQUETS-MONGE, Salvador ALEPUZ, Gabriel GARCIA-ROJAS, Germán FAÑANÁS PUIGJANER	[View] [Download]
Abstract: This article explores the optimal or near-optimal design configuration of a three-level neutral-point-clamped traction inverter for electric vehicles based on switching-cell array devices.From the definition of a suitable design optimization problem taking into account efficiency, reliability, and simplicity, the optimal solution for the leg configuration and operation isobtained under different scenarios and operating conditions. It is concluded that, in each case, themain operating conditions may decisively influence the selected design.

	Influence of the r\_{ds,on} temperature dependency of SiC MOSFETs on the optimal switching cell mechanical layout By Georgios PAPADOPOULOS, Jürgen BIELA	[View] [Download]
Abstract: The design of power electronic systems is typically performed based on optimisation procedures. Inthis paper, the influence of the temperature dependant on-state resistance on the optimal switching cell mechanical layout is investigated. A standardised half-bridge switching cell is modelled and optimised to discuss the importance of establishing general layout recommendations.

	Optimization of Temperature Sensor Placement in Multi-Chip Power Modules Using Frequency Domain Analysis By Usama AZHAR, Alireza AGHDAEI, Rik W. DE DONCKER	[View] [Download]
Abstract: Accurate real-time temperature measurement is crucial for monitoring power modules, particularly in critical applications. Embedded temperature sensors, such as negative-temperature coefficient (NTC) thermistors, are commonly utilized for this purpose. The arrangement of these sensors plays a pivotal role, as the accuracy of measurements relies on their placement. This paper presents a new methodology for optimally placing temperature sensors in multi-chip power modules for improved temperature estimation. The optimum sensor arrangement is achieved by introducing the frequency bandwidth as a new optimization parameter and maximizing it based on the number of sensors. The efficacy of this methodology is demonstrated using one multi-chip power module, and the optimal sensor locations are validated for average temperature over an actual mission profile. Compared to the original NTC location, significant improvements are observed at the predicted optimal locations.

	Paralleling SMD Semiconductor Switching Cells in a Flying Capacitor Converter System By Daniel CHRISTEN, Mario SCHWEIZER, Hemant BISHNOI, Milos STOJADINOVIC, Sami PETTERSSON, Francisco CANALES	[View] [Download]
Abstract: In this paper, the parallel arrangement of SMD semiconductor devices for example in a flying capacitor topology is addressed. A concept of alternating arranged switching cells is proposed, in which the magnetic field is naturally cancelled. This enables a proper current sharing in the devices during the switching transition, which is shown by measurements. This concept is applicable for any parallel arrangement of semiconductor devices to improve the current sharing also in dynamic cases as e.g. theswitching transitions.

	Performance Assessment of the Adjustable Hybrid Switch Converter for E-mobility Applications By Tanya THEKEMURIYIL, Munaf T.A. RAHIMO, Renato Amaral MINAMISAWA, Silvia MASTELLONE	[View] [Download]
Abstract: An Adjustable Hybrid Switch (AHS) converter for electric vehicles (EV) is realized, configured, and operated to optimize the inverter performance over the whole driving profile. The AHS concept equips the EV with an 'Electronic Gear' functionality by online configuring the Cross-Switch (XS) hybrid power converter. The semiconductors in parallel are individually operated according to an optimization-based control algorithm to attain an increase of efficiency above 4\% with respect to a conventional Si IGBT converter. The Adjustable Hybrid Switch is most effective in applications like electric vehicles where the converter operates mostly in sub-load conditions.

	Power Loop Inductance Optimization Strategy for Eliminating Turn-off Switching Surge for GaN-HEMT Switching Device By Kazuhiro UMETANI, Kento TANOHARA, Koki ABE, Masataka ISHIHARA, Eiji HIRAKI	[View] [Download]
Abstract: The gallium nitride high electron mobility transistors (GaN-HEMTs) are increasingly applied for high-power switching converters. However, their fast switching in high-power applications tends to generate enormous switching surges at the turn-off, which may destroy the switching device. This problem can be mitigated by optimizing the wire structure to minimize the power loop inductance, although satisfactory reduction of this inductance is difficult in many practical designs. This paper address this issue by optimizing the power loop inductance rather than seeking the entire elimination of this inductance. This paper analytically elucidates the existence of the optimal power loop inductance that ideally generates no turn-off surge with fast-switching GaN-HEMTs. An experiment supported the analytical result, suggesting the optimal design of power loop inductance is promising for the power module design of GaN-HEMTs.

	Power Losses Reduction of Parallel Connected Power Electronics Devices By Essam HUSSAIN, Bin LIU	[View] [Download]
Abstract: Due to the increase in the power rating of power converters' applications and the limitation of the power electronics devices' capability in terms of voltage and current rating, parallel-connected power electronics devices are one of the solutions to overcome this limitation. In this paper, two control techniques to control parallel connection power electronics devices are presented. The main idea is controlling the active time of each power electronics device according to the load current. The number of connected devices depends on the load current and the current ratingof the devices. Therefore, the switching losses of the power electronics devices will be reduced. This offers a reduction in the total power losses and the power electronics devices can be arranged for better thermal management. Simulation results show an 8-10\% reduction in power electronics losses and up to 100C reduction in the temperature of the hot spot point.

	Reduce Order Modeling of the modular multilevel DC/DC converter (M2DC) for HVDC grid By Ghazala SHAFIQUE, Johan BOUKHENFOUF, François GRUSON, Shabab SAMIMI, Philippe DELARUE, Philippe LE MOIGNE, Frédéric COLAS, Michael MERLIN, Xavier GUILLAUD	[View] [Download]
Abstract: The Modular Multi-Level DC-DC Converter (M2DC) is an attractive non-isolated DC-DC converter topology for HVDC grid. In order to carry out MTDC grid stability studies, the development of reduce order models of converters is necessary. This article first presents the M2DC converter. Then, the reduce order model will be developed in the second part. The development of the control of this model will be carried out in the third part. Atlast, the comparison of the reduce order model and its control with the average arm model will be performed in the later section of the paper.

	Self-Oscillating Drive Circuit Using Cascode-Connected Normally-on Device and Normally-off Device for Self-Powered Active Bridges By Yoshihiro MIWA, Hiroyuki SHOJI, Junichi SAKANO	[View] [Download]
Abstract: Self-powered active bridges have the same number of external terminals as diode bridges, and they can improve the efficiency of conventional PFC boost rectifiers that come with a diode bridge for line rectification. However, bulk capacitors required for accumulating energy to drive rectification MOSFETs cause increase in the mounting area of drive circuits. This paper proposes a novel self-oscillating drive circuit, in which two pairs of cascode-connected a high-breakdown voltage normally-on device and a low-breakdown voltage normally-off device are used as the lower-arm rectification switches, to reduce the number of bulk capacitors. The operation of the proposed drive circuit was verified experimentally, and the efficiency of a 2.4 kW PFC boost rectifier that comes with the proposed drive circuit was measured.