EPE Association: EPE 2019 - DS2j: Power Supplies

EPE 2019 - DS2j: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 07: Power Supplies > EPE 2019 - DS2j: Power Supplies

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   A 300kHz 4kW 140kVDC Output Voltage Power Supply with Modular High Voltage Generation Architecture and Planar Transformer
By Saijun MAO [View]
[Download]

Abstract: This paper investigates a modular high frequency high voltage (HV) power supply architecture with planar transformer to achieve compact size and high efficiency. The insulation stress and voltage distribution different architectures with planar transformer are analyzed in firstly. An optimized modular high frequency HV generator architecture with planar transformer is proposed with even voltage distribution, low high frequency AC stress, easy insulation design and good thermal performance. The HV insulation and electric design of the HV planar transformer are provided. A prototype with 300kHz 4kW 140kVDC HV power supply with modular HV generation architecture and planar transformer is built to validate the concept finally.

   A High Frequency 110kV Output Voltage, 8kW Output Power Isolated High Voltage Generator with Silicon Carbide Power Semiconductor Devices
By Saijun MAO [View]
[Download]

Abstract: This paper investigates a modular high frequency high voltage (HV) power supply architecture with planar transformer to achieve compact size and high efficiency. The insulation stress and voltage distribution different architectures with planar transformer are analyzed in firstly. An optimized modular high frequency HV generator architecture with planar transformer is proposed with even voltage distribution, low high frequency AC stress, easy insulation design and good thermal performance. The HV insulation and electric design of the HV planar transformer are provided. A prototype with 300kHz 4kW 140kVDC HV power supply with modular HV generation architecture and planar transformer is built to validate the concept finally.

   A Line-Interactive UPS System Operating with Optimized Power Processing in Backup Mode
By Vinícius DE SOUZA [View]
[Download]

Abstract: This paper proposes strategies to share the energy handled by the series and parallel converters, which compose a single-phase line-interactive UPS system. Thus, the overall amount of active and non-active (reactive and harmonic) power processed by the PWM converters can be optimized when the UPS operates in backup-mode. Based on the functioning of the presented line-interactive UPS system, in standby operation mode, the powers processed by the series and parallel converters are lower than those demanded by the load, such that both converters operate underload. On the other hand, in backup-mode, the series converter is inhibited, while the parallel converter remains feeding the load. In other words, the parallel converter must be sized to provide all the power demanded by the load. It can be highlighted that by employing the strategies proposed in this paper, the series converter is not inhibited in backup-mode. Therefore, the power compensation algorithms predict an effective power sharing between the converters based on the amount of energy demanded by the load. As a result, the sizing of the parallel converter can be optimized, since its nominal VA power rate decreases and does not need to be equal to that demanded by the load. Simulation results are performed in order to present the effectiveness of the proposed power sharing compensation strategies.

   Analysis of PCB parasitic effects in a Vienna Rectifier for an EV battery charger by means of Electromagnetic Simulations
By Francesco PALOMBA [View]
[Download]

Abstract: The aim of this work is to investigate the impact of the PCB (Printed Circuit Board) electrical parasitic parameters on the performances of a SiC Three-Level T-type rectifier used for electric vehicle battery chargers. The short switching times of the SiC devices enables high switching frequency at very high efficiency. On the other hand, as the time derivative of the current increases (as a rule of thumb we can set 1A/ns as a breaking point), PCB parasitics start to play a significant role and may cause the degradation of the performances or even a design failure, if not taken into account right from the first design stage. Industry standard EDA (Electronic Design Automation) tools can be used to extract a model for the PCB to evaluate all the unwanted effects introduced by the physical realization of the board layout. For the scope of the current study, the software Advanced Design System, ADS by Keysight Technologies has been used to extract an S-parameter based model of the PCB and co-simulate it with the circuit components. Results obtained with and without the PCB model are finally compared for two different design iterations.

   FEA based Model for High-Frequency Design Optimization of a Three-Winding Coupled Inductor for HSU Converters
By Bilal AHMAD [View]
[Download]

Abstract: Inductors for power electronic converters resonate at a self-resonance frequency due to the presence of parasitic capacitances. Beyond the resonance frequency, the impedance of the inductor demonstrates capacitive nature and hence will provide a low impedance path to high-frequency noise components. In this paper, self-resonance frequency of the inductor for an HSU converter has been evaluated by the application of FEA models. Simulations are performed under different design scenarios to optimize the inductor for high frequency performance. Results showed that the self-resonance frequency is increased by the size of core and decreasing the number of turns. However, power density of converter puts a maximum limit on the size of the core. Also, this study provides an approach to optimize the gain of converter as results showed that the inductor design for higher voltage gain has lower self-resonance frequency.

   Gate Voltage Fluctuation Reduction in Fast-switching Operation for Uninterruptible Power System with SiC-MOSFET
By Hiroshi KAMIZUMA [View]
[Download]

Abstract: A low noise gate drive architecture for uninterruptible power systems with SiC-MOSFET was developed. An active miller clamp circuit with dumping resistance was applied to the gate drive circuits to reduce gate voltage fluctuation caused by common source inductance in fast-switching operation. As a result, a 200 V / 20 kVA UPS achieves high efficiency of 93.7\%.

   High voltage resonant converter to generate plasma in open air
By Juan A. MARTÍN-RAMOS [View]
[Download]

Abstract: The paper studies a parallel resonant converter with a capacitor as output filter to generate and maintaina glow discharge in air. The application requires a high output voltage for air breakdown and muchlower values to maintain discharge operation. Attention is payed to converter steady state and dynamicaspects.

   Impedance-Based Stability Analysis of DC Bus System for Servo Drives
By Takeshi KIRIBUCHI [View]
[Download]

Abstract: Servo drive motor systems using PWM inverters has become very popular in industry due to its high controllability of torque, speed and position. Recently, the problems of EMI noise and complexity of wiring from 3-phase PWM inverter power line cables has become obvious in a factory settings. Also, utilizing the regenerative energy of the motor has become important in the industry. The DC bus system should be a good choice, however, it has a risk of system instability due to a negative impedance of the servo drives. In our previous study [1], an impedance-based stability analysis was introduced and the predicted critical point (DC bus current) of instability was confirmed by an experiment using a real motor. In this paper, a simulation model was created to see the behavior of the unstable waveform. Simulated waveforms successfully duplicated measured waveforms of the unstable oscillation behavior.

   Input Series Output Parallel (ISOP) full-wave rectifier for highly scalable and self-balancing multicellular ac-dc converter
By Yusuke HAYASHI [View]
[Download]

Abstract: Novel multicellular ac-dc converter has been proposed for future dc power supply systems. One of characteristics of the proposed converter is the application of the Input Series Output Parallel (ISOP) connection topology of isolated and non-regulated full-wave cell rectifiers. The ISOP connection topology of the isolated and non-regulated power converters inherently achieves the self-balancing of the voltage stresses of all the cell rectifiers without any sensors, controllers and auxiliary circuits. The multicellular ac-dc power converter of various voltage levels can be fabricated by stacking the cell rectifiers without any auxiliaries, and the efficiency and the power density of the multicellular converter theoretically correspond to these performances of the single cell converter. A prototype of an ac 200 V-dc 48 V, 900 W multicellular converter using six 150 W cell rectifiers connected in ISOP has been developed, and the efficiency over 96\% has been verified within the range of 20\% to 100\% load conditions. The proposed converter topology would facilitate the prevalence of the standardized and componentized power electronics converters, and this would contribute to realizing highly efficient power distribution network in the future highly electrified society.

   Mixed Signals Based Control of a SiC Vienna Rectifier for On-Board Battery Chargers
By Giuseppe AIELLO [View]
[Download]

Abstract: The main aim of this work is to investigate the feasibility of implementing a low-cost mixed-signal based control solution for a SiC three-level Vienna rectifier addressing electric vehicle on-board battery charger applications. The proposed solution allows to achieve almost unitary power factor operation as well as higher control loop bandwidths and lower total harmonic distortions in comparison with standard all-digital implementation using low-cost digital platform. A detailed description of the combined digital-analog approach is provided, as well as an experimental validation of the proposed solution for a 12kW on-board battery charger.

   Optimization of isolated DC-DC converter topologies for fuel cell applications
By Lajos TÖRÖK [View]
[Download]

Abstract: This paper addresses challenges in identifying the optimum isolated topology for fuel cell power conversion based on Gallium Nitride (GaN) technology. Based on commercially available passive and active components and analytic equations, Pareto-front is generated to aid the topology and component selection. The Pareto-front for cost, efficiency is generated using a Monte-Carlo-based algorithm. It is shown that the classical isolated buck and boost converters are hard to beat on price but using advanced topologies may yield improved converter efficiency.

   Robust Fault Detection of Hybrid Switched-Capacitor Dickson Converter for Fault-Tolerant Automotive Applications
By Mojtaba ASHOURLOO [View]
[Download]

Abstract: This paper presents short-circuit and open-circuit fault detection schemes for power switching devicesand flying capacitors in a hybrid Dickson dc-dc converter. The methods only rely on the switching-nodevoltage characteristics, which eliminates the need for high-voltage sensing circuitry. The performance ofthe design is verified using a 36-W four-phase 48-to-3.3-V 4-to-1 hybrid Dickson converter prototype.

   Single Feedback Regulation of the AC Voltage for High-Power Inverters under Stand-Alone Operation
By Joseba ERDOCIA [View]
[Download]

Abstract: Energy-storage inverters under stand-alone operation must control the output voltage. However, existing methods for instantaneous voltage regulation are not suitable for high-power inverters due to their limited sampling frequency. To avoid this problem, a single feedback voltage loop with feedforward compensation is proposed in this paper, making it possible to actively damp the LCL filter resonance and thus facilitating the controller design. Simulation results demonstrate the fast reference tracking and the high-quality voltage obtained with non-linear loads.

   Submodule Topology Comparisons of DAB Based PET in MVDC Distribution Application
By Zedong ZHENG [View]
[Download]

Abstract: In MVDC distribution applications, input-series-output-parallel (ISOP) configurations are often used in Power Electronics Transformers (PET) to achieve high voltage level on the MVDC side and high voltage ratio conversion. In the paper, 2 feasible DAB based submodule topologies are compared in ISOP DC PETs from a system-level aspect. With the proposed parameter design methodology, comparisons are done between the two topologies considering numbers of normal and redundant submodules, different working conditions, rated voltages and power of the PET, switching frequencies and commercial devices. Theoretical analysis, simulation and experimental results showed that the 2 topologies has no significant difference in efficiency. Considering its advantages in redundancy in the PET, the boost and DAB is a preferable choice for submodules in ISOP DC PETs.

EPE 2019 - DS2j: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 07: Power Supplies > EPE 2019 - DS2j: Power Supplies
	[return to parent folder]

	A 300kHz 4kW 140kVDC Output Voltage Power Supply with Modular High Voltage Generation Architecture and Planar Transformer By Saijun MAO	[View] [Download]
Abstract: This paper investigates a modular high frequency high voltage (HV) power supply architecture with planar transformer to achieve compact size and high efficiency. The insulation stress and voltage distribution different architectures with planar transformer are analyzed in firstly. An optimized modular high frequency HV generator architecture with planar transformer is proposed with even voltage distribution, low high frequency AC stress, easy insulation design and good thermal performance. The HV insulation and electric design of the HV planar transformer are provided. A prototype with 300kHz 4kW 140kVDC HV power supply with modular HV generation architecture and planar transformer is built to validate the concept finally.

	A High Frequency 110kV Output Voltage, 8kW Output Power Isolated High Voltage Generator with Silicon Carbide Power Semiconductor Devices By Saijun MAO	[View] [Download]
Abstract: This paper investigates a modular high frequency high voltage (HV) power supply architecture with planar transformer to achieve compact size and high efficiency. The insulation stress and voltage distribution different architectures with planar transformer are analyzed in firstly. An optimized modular high frequency HV generator architecture with planar transformer is proposed with even voltage distribution, low high frequency AC stress, easy insulation design and good thermal performance. The HV insulation and electric design of the HV planar transformer are provided. A prototype with 300kHz 4kW 140kVDC HV power supply with modular HV generation architecture and planar transformer is built to validate the concept finally.

	A Line-Interactive UPS System Operating with Optimized Power Processing in Backup Mode By Vinícius DE SOUZA	[View] [Download]
Abstract: This paper proposes strategies to share the energy handled by the series and parallel converters, which compose a single-phase line-interactive UPS system. Thus, the overall amount of active and non-active (reactive and harmonic) power processed by the PWM converters can be optimized when the UPS operates in backup-mode. Based on the functioning of the presented line-interactive UPS system, in standby operation mode, the powers processed by the series and parallel converters are lower than those demanded by the load, such that both converters operate underload. On the other hand, in backup-mode, the series converter is inhibited, while the parallel converter remains feeding the load. In other words, the parallel converter must be sized to provide all the power demanded by the load. It can be highlighted that by employing the strategies proposed in this paper, the series converter is not inhibited in backup-mode. Therefore, the power compensation algorithms predict an effective power sharing between the converters based on the amount of energy demanded by the load. As a result, the sizing of the parallel converter can be optimized, since its nominal VA power rate decreases and does not need to be equal to that demanded by the load. Simulation results are performed in order to present the effectiveness of the proposed power sharing compensation strategies.

	Analysis of PCB parasitic effects in a Vienna Rectifier for an EV battery charger by means of Electromagnetic Simulations By Francesco PALOMBA	[View] [Download]
Abstract: The aim of this work is to investigate the impact of the PCB (Printed Circuit Board) electrical parasitic parameters on the performances of a SiC Three-Level T-type rectifier used for electric vehicle battery chargers. The short switching times of the SiC devices enables high switching frequency at very high efficiency. On the other hand, as the time derivative of the current increases (as a rule of thumb we can set 1A/ns as a breaking point), PCB parasitics start to play a significant role and may cause the degradation of the performances or even a design failure, if not taken into account right from the first design stage. Industry standard EDA (Electronic Design Automation) tools can be used to extract a model for the PCB to evaluate all the unwanted effects introduced by the physical realization of the board layout. For the scope of the current study, the software Advanced Design System, ADS by Keysight Technologies has been used to extract an S-parameter based model of the PCB and co-simulate it with the circuit components. Results obtained with and without the PCB model are finally compared for two different design iterations.

	FEA based Model for High-Frequency Design Optimization of a Three-Winding Coupled Inductor for HSU Converters By Bilal AHMAD	[View] [Download]
Abstract: Inductors for power electronic converters resonate at a self-resonance frequency due to the presence of parasitic capacitances. Beyond the resonance frequency, the impedance of the inductor demonstrates capacitive nature and hence will provide a low impedance path to high-frequency noise components. In this paper, self-resonance frequency of the inductor for an HSU converter has been evaluated by the application of FEA models. Simulations are performed under different design scenarios to optimize the inductor for high frequency performance. Results showed that the self-resonance frequency is increased by the size of core and decreasing the number of turns. However, power density of converter puts a maximum limit on the size of the core. Also, this study provides an approach to optimize the gain of converter as results showed that the inductor design for higher voltage gain has lower self-resonance frequency.

	Gate Voltage Fluctuation Reduction in Fast-switching Operation for Uninterruptible Power System with SiC-MOSFET By Hiroshi KAMIZUMA	[View] [Download]
Abstract: A low noise gate drive architecture for uninterruptible power systems with SiC-MOSFET was developed. An active miller clamp circuit with dumping resistance was applied to the gate drive circuits to reduce gate voltage fluctuation caused by common source inductance in fast-switching operation. As a result, a 200 V / 20 kVA UPS achieves high efficiency of 93.7\%.

	High voltage resonant converter to generate plasma in open air By Juan A. MARTÍN-RAMOS	[View] [Download]
Abstract: The paper studies a parallel resonant converter with a capacitor as output filter to generate and maintaina glow discharge in air. The application requires a high output voltage for air breakdown and muchlower values to maintain discharge operation. Attention is payed to converter steady state and dynamicaspects.

	Impedance-Based Stability Analysis of DC Bus System for Servo Drives By Takeshi KIRIBUCHI	[View] [Download]
Abstract: Servo drive motor systems using PWM inverters has become very popular in industry due to its high controllability of torque, speed and position. Recently, the problems of EMI noise and complexity of wiring from 3-phase PWM inverter power line cables has become obvious in a factory settings. Also, utilizing the regenerative energy of the motor has become important in the industry. The DC bus system should be a good choice, however, it has a risk of system instability due to a negative impedance of the servo drives. In our previous study [1], an impedance-based stability analysis was introduced and the predicted critical point (DC bus current) of instability was confirmed by an experiment using a real motor. In this paper, a simulation model was created to see the behavior of the unstable waveform. Simulated waveforms successfully duplicated measured waveforms of the unstable oscillation behavior.

	Input Series Output Parallel (ISOP) full-wave rectifier for highly scalable and self-balancing multicellular ac-dc converter By Yusuke HAYASHI	[View] [Download]
Abstract: Novel multicellular ac-dc converter has been proposed for future dc power supply systems. One of characteristics of the proposed converter is the application of the Input Series Output Parallel (ISOP) connection topology of isolated and non-regulated full-wave cell rectifiers. The ISOP connection topology of the isolated and non-regulated power converters inherently achieves the self-balancing of the voltage stresses of all the cell rectifiers without any sensors, controllers and auxiliary circuits. The multicellular ac-dc power converter of various voltage levels can be fabricated by stacking the cell rectifiers without any auxiliaries, and the efficiency and the power density of the multicellular converter theoretically correspond to these performances of the single cell converter. A prototype of an ac 200 V-dc 48 V, 900 W multicellular converter using six 150 W cell rectifiers connected in ISOP has been developed, and the efficiency over 96\% has been verified within the range of 20\% to 100\% load conditions. The proposed converter topology would facilitate the prevalence of the standardized and componentized power electronics converters, and this would contribute to realizing highly efficient power distribution network in the future highly electrified society.

	Mixed Signals Based Control of a SiC Vienna Rectifier for On-Board Battery Chargers By Giuseppe AIELLO	[View] [Download]
Abstract: The main aim of this work is to investigate the feasibility of implementing a low-cost mixed-signal based control solution for a SiC three-level Vienna rectifier addressing electric vehicle on-board battery charger applications. The proposed solution allows to achieve almost unitary power factor operation as well as higher control loop bandwidths and lower total harmonic distortions in comparison with standard all-digital implementation using low-cost digital platform. A detailed description of the combined digital-analog approach is provided, as well as an experimental validation of the proposed solution for a 12kW on-board battery charger.

	Optimization of isolated DC-DC converter topologies for fuel cell applications By Lajos TÖRÖK	[View] [Download]
Abstract: This paper addresses challenges in identifying the optimum isolated topology for fuel cell power conversion based on Gallium Nitride (GaN) technology. Based on commercially available passive and active components and analytic equations, Pareto-front is generated to aid the topology and component selection. The Pareto-front for cost, efficiency is generated using a Monte-Carlo-based algorithm. It is shown that the classical isolated buck and boost converters are hard to beat on price but using advanced topologies may yield improved converter efficiency.

	Robust Fault Detection of Hybrid Switched-Capacitor Dickson Converter for Fault-Tolerant Automotive Applications By Mojtaba ASHOURLOO	[View] [Download]
Abstract: This paper presents short-circuit and open-circuit fault detection schemes for power switching devicesand flying capacitors in a hybrid Dickson dc-dc converter. The methods only rely on the switching-nodevoltage characteristics, which eliminates the need for high-voltage sensing circuitry. The performance ofthe design is verified using a 36-W four-phase 48-to-3.3-V 4-to-1 hybrid Dickson converter prototype.

	Single Feedback Regulation of the AC Voltage for High-Power Inverters under Stand-Alone Operation By Joseba ERDOCIA	[View] [Download]
Abstract: Energy-storage inverters under stand-alone operation must control the output voltage. However, existing methods for instantaneous voltage regulation are not suitable for high-power inverters due to their limited sampling frequency. To avoid this problem, a single feedback voltage loop with feedforward compensation is proposed in this paper, making it possible to actively damp the LCL filter resonance and thus facilitating the controller design. Simulation results demonstrate the fast reference tracking and the high-quality voltage obtained with non-linear loads.

	Submodule Topology Comparisons of DAB Based PET in MVDC Distribution Application By Zedong ZHENG	[View] [Download]
Abstract: In MVDC distribution applications, input-series-output-parallel (ISOP) configurations are often used in Power Electronics Transformers (PET) to achieve high voltage level on the MVDC side and high voltage ratio conversion. In the paper, 2 feasible DAB based submodule topologies are compared in ISOP DC PETs from a system-level aspect. With the proposed parameter design methodology, comparisons are done between the two topologies considering numbers of normal and redundant submodules, different working conditions, rated voltages and power of the PET, switching frequencies and commercial devices. Theoretical analysis, simulation and experimental results showed that the 2 topologies has no significant difference in efficiency. Considering its advantages in redundancy in the PET, the boost and DAB is a preferable choice for submodules in ISOP DC PETs.