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The Experts below are selected from a list of 939 Experts worldwide ranked by ideXlab platform

Mehdi Ferdowsi – 1st expert on this subject based on the ideXlab platform

  • High-Voltage-Gain DC–DC Step-Up Converter With Bifold Dickson Voltage Multiplier Cells
    IEEE Transactions on Power Electronics, 2020
    Co-Authors: Ahmad Alzahrani, Mehdi Ferdowsi, Pourya Shamsi

    Abstract:

    This paper presents an interleaved Boost converter with a bifold Dickson voltage multiplier suitable for interfacing low-voltage renewable energy sources to high-voltage distribution buses and other applications that require a high-voltage-gain conversion ratio. The proposed converter was constructed from two Stages: an interleaved Boost Stage, which contains two inductors operated by two low-side active switches, and a voltage multiplier cell (VMC) Stage, which mainly consists of diodes and capacitors to increase the overall voltage gain. The proposed converter offers a high-voltage-gain ratio with low voltage stress on the semiconductor switches as well as the passive components. This allows the selection of efficient and compact components. Moreover, the required inductance that ensures operation in the continuous conduction mode (CCM) is lower than the one in the conventional interleaved Boost converter. The distinction of the proposed converter is that the inductors’ currents are equal, regardless of the number of VMCs. Equal sharing of interleaved Boost–Stage currents reduces the conduction loss in the active switches as well as the inductors and thus improves the overall efficiency, as the conduction power loss is a quadratic function. In this paper, the theory of operation and steady-state analysis of the proposed converter are illustrated and verified by simulation results. A $\text{200-W}$ hardware prototype was implemented to convert a $\text{20-V}$ input source to a $\text{400-V}$ dc load and validate both the theory and the simulation.

  • A Family of Scalable Non-Isolated Interleaved DC-DC Boost Converters With Voltage Multiplier Cells
    IEEE Access, 2019
    Co-Authors: Ahmad Alzahrani, Mehdi Ferdowsi, Pourya Shamsi

    Abstract:

    In this paper, a family of non-isolated interleaved high-voltage-gain DC-DC converters is presented. This family can be used in a wide variety of applications, such as in a photovoltaic systems interface to a high voltage DC distribution bus in a microgrid and an X-ray system power supply. The general structure of this family is illustrated and consists of two Stages: an interleaved Boost Stage and a voltage multiplier Stage. The interleaved Boost Stage is a two-phase Boost converter, and it converts the input DC voltage to an AC square waveform. Moreover, using the interleaved Boost Stage increases the frequency of the AC components so that it can be easily filtered with smaller capacitors and, therefore, makes the input current smoother than the one from the conventional Boost converter. The voltage multiplier cell (VMC) can be a Dickson cell, Cockcroft-Walton (CW), or a combination of the two. The VMC Stage rectifies the square-shaped voltage waveform coming from the interleaved Boost Stage and converts it to a high DC voltage. Several combinations of VMCs and how they can be extended are illustrated, and the difference between them is summarized so that designers can be able to select the appropriate topology for their applications. An example of this converter family is illustrated with detailed modes of operation, a steady-state analysis, and an efficiency analysis. The example converter was simulated to convert 20 VDC to 400DC, and a 200 W hardware prototype was implemented to verify the analysis and simulation. The results show that the example has a peak efficiency of 97% of this family of converters and can be very suitable for interfacing renewable energy sources to a 400 VDC DC distribution system.

  • High-Voltage-Gain DC–DC Step-Up Converter With Bifold Dickson Voltage Multiplier Cells
    IEEE Transactions on Power Electronics, 2019
    Co-Authors: Ahmad Alzahrani, Mehdi Ferdowsi, Pourya Shamsi

    Abstract:

    This paper presents an interleaved Boost converter with a bifold Dickson voltage multiplier suitable for interfacing low-voltage renewable energy sources to high-voltage distribution buses and other applications that require a high-voltage-gain conversion ratio. The proposed converter was constructed from two Stages: an interleaved Boost Stage, which contains two inductors operated by two low-side active switches, and a voltage multiplier cell (VMC) Stage, which mainly consists of diodes and capacitors to increase the overall voltage gain. The proposed converter offers a high-voltage-gain ratio with low voltage stress on the semiconductor switches as well as the passive components. This allows the selection of efficient and compact components. Moreover, the required inductance that ensures operation in the continuous conduction mode (CCM) is lower than the one in the conventional interleaved Boost converter. The distinction of the proposed converter is that the inductors’ currents are equal, regardless of the number of VMCs. Equal sharing of interleaved Boost–Stage currents reduces the conduction loss in the active switches as well as the inductors and thus improves the overall efficiency, as the conduction power loss is a quadratic function. In this paper, the theory of operation and steady-state analysis of the proposed converter are illustrated and verified by simulation results. A 200-W hardware prototype was implemented to convert a 20-V input source to a 400-V dc load and validate both the theory and the simulation.

Pourya Shamsi – 2nd expert on this subject based on the ideXlab platform

  • High-Voltage-Gain DC–DC Step-Up Converter With Bifold Dickson Voltage Multiplier Cells
    IEEE Transactions on Power Electronics, 2020
    Co-Authors: Ahmad Alzahrani, Mehdi Ferdowsi, Pourya Shamsi

    Abstract:

    This paper presents an interleaved Boost converter with a bifold Dickson voltage multiplier suitable for interfacing low-voltage renewable energy sources to high-voltage distribution buses and other applications that require a high-voltage-gain conversion ratio. The proposed converter was constructed from two Stages: an interleaved Boost Stage, which contains two inductors operated by two low-side active switches, and a voltage multiplier cell (VMC) Stage, which mainly consists of diodes and capacitors to increase the overall voltage gain. The proposed converter offers a high-voltage-gain ratio with low voltage stress on the semiconductor switches as well as the passive components. This allows the selection of efficient and compact components. Moreover, the required inductance that ensures operation in the continuous conduction mode (CCM) is lower than the one in the conventional interleaved Boost converter. The distinction of the proposed converter is that the inductors’ currents are equal, regardless of the number of VMCs. Equal sharing of interleaved Boost–Stage currents reduces the conduction loss in the active switches as well as the inductors and thus improves the overall efficiency, as the conduction power loss is a quadratic function. In this paper, the theory of operation and steady-state analysis of the proposed converter are illustrated and verified by simulation results. A $\text{200-W}$ hardware prototype was implemented to convert a $\text{20-V}$ input source to a $\text{400-V}$ dc load and validate both the theory and the simulation.

  • A Family of Scalable Non-Isolated Interleaved DC-DC Boost Converters With Voltage Multiplier Cells
    IEEE Access, 2019
    Co-Authors: Ahmad Alzahrani, Mehdi Ferdowsi, Pourya Shamsi

    Abstract:

    In this paper, a family of non-isolated interleaved high-voltage-gain DC-DC converters is presented. This family can be used in a wide variety of applications, such as in a photovoltaic systems interface to a high voltage DC distribution bus in a microgrid and an X-ray system power supply. The general structure of this family is illustrated and consists of two Stages: an interleaved Boost Stage and a voltage multiplier Stage. The interleaved Boost Stage is a two-phase Boost converter, and it converts the input DC voltage to an AC square waveform. Moreover, using the interleaved Boost Stage increases the frequency of the AC components so that it can be easily filtered with smaller capacitors and, therefore, makes the input current smoother than the one from the conventional Boost converter. The voltage multiplier cell (VMC) can be a Dickson cell, Cockcroft-Walton (CW), or a combination of the two. The VMC Stage rectifies the square-shaped voltage waveform coming from the interleaved Boost Stage and converts it to a high DC voltage. Several combinations of VMCs and how they can be extended are illustrated, and the difference between them is summarized so that designers can be able to select the appropriate topology for their applications. An example of this converter family is illustrated with detailed modes of operation, a steady-state analysis, and an efficiency analysis. The example converter was simulated to convert 20 VDC to 400DC, and a 200 W hardware prototype was implemented to verify the analysis and simulation. The results show that the example has a peak efficiency of 97% of this family of converters and can be very suitable for interfacing renewable energy sources to a 400 VDC DC distribution system.

  • High-Voltage-Gain DC–DC Step-Up Converter With Bifold Dickson Voltage Multiplier Cells
    IEEE Transactions on Power Electronics, 2019
    Co-Authors: Ahmad Alzahrani, Mehdi Ferdowsi, Pourya Shamsi

    Abstract:

    This paper presents an interleaved Boost converter with a bifold Dickson voltage multiplier suitable for interfacing low-voltage renewable energy sources to high-voltage distribution buses and other applications that require a high-voltage-gain conversion ratio. The proposed converter was constructed from two Stages: an interleaved Boost Stage, which contains two inductors operated by two low-side active switches, and a voltage multiplier cell (VMC) Stage, which mainly consists of diodes and capacitors to increase the overall voltage gain. The proposed converter offers a high-voltage-gain ratio with low voltage stress on the semiconductor switches as well as the passive components. This allows the selection of efficient and compact components. Moreover, the required inductance that ensures operation in the continuous conduction mode (CCM) is lower than the one in the conventional interleaved Boost converter. The distinction of the proposed converter is that the inductors’ currents are equal, regardless of the number of VMCs. Equal sharing of interleaved Boost–Stage currents reduces the conduction loss in the active switches as well as the inductors and thus improves the overall efficiency, as the conduction power loss is a quadratic function. In this paper, the theory of operation and steady-state analysis of the proposed converter are illustrated and verified by simulation results. A 200-W hardware prototype was implemented to convert a 20-V input source to a 400-V dc load and validate both the theory and the simulation.

Vassilios Georgios Agelidis – 3rd expert on this subject based on the ideXlab platform

  • a single Stage fuel cell energy system based on a buck Boost inverter with a backup energy storage unit
    IEEE Transactions on Power Electronics, 2012
    Co-Authors: Minsoo Jang, Mihai Ciobotaru, Vassilios Georgios Agelidis

    Abstract:

    An energy system powered by a low-voltage fuel cell (FC) is conditioned to generate higher–voltage regulated ac voltage. The power conditioning system typically requires two power Stages: a Boost Stage and an inversion Stage. In this paper, the buck–Boost inverter topology that achieves both Boosting and inversion functions in a single Stage is used as a building block to develop a single-phase FC-based energy system that offers high conversion efficiency, low-cost and compactness. The proposed system incorporates a backup energy storage unit to support the slow dynamics of the FC. The single-phase buck–Boost inverter is voltage-mode controlled and the backup unit is current-mode controlled. The low-frequency current ripple is supplied by the backup unit that minimizes the detrimental effects of such ripple being drawn directly from the FC itself. Experimental results from a 1-kW prototype operating at 20 kHz are presented to validate the analysis and performance of the proposed system.

  • a minimum power processing Stage fuel cell energy system based on a Boost inverter with a bidirectional backup battery storage
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Minsoo Jang, Vassilios Georgios Agelidis

    Abstract:

    When low-voltage unregulated fuel-cell (FC) output is conditioned to generate ac power, two Stages are required: a Boost Stage and an inversion one. In this paper, the Boost-inverter topology that achieves both Boosting and inversion functions in a single Stage is used to develop an FC-based energy system that offers high conversion efficiency, low-cost, and compactness. The proposed system incorporates additional battery-based energy storage and a dc-dc bidirectional converter to support instantaneous load changes. The output voltage of the Boost-inverter is voltage-mode controlled and the dc-dc bidirectional converter is current-mode controlled. The load low-frequency current ripple is supplied by the battery, which minimizes the effects of such ripple being drawn directly from the FC itself. Analysis, simulation, and experimental results are presented to confirm the operational performance of the proposed system.

  • a minimum power processing Stage fuel cell energy system based on a Boost inverter with a bi directional back up battery storage
    Applied Power Electronics Conference, 2010
    Co-Authors: Minsoo Jang, Vassilios Georgios Agelidis

    Abstract:

    When low-voltage unregulated fuel cell (FC) output is conditioned to generate AC power, two Stages are required: a Boost Stage and an inversion one. In this paper, the Boost-inverter topology that achieves both Boosting and inversion functions in a single-Stage is used to develop an FC-based energy system which offers high conversion efficiency, low-cost and compactness. The proposed system incorporates additional battery-based energy storage and a DC-DC bi-directional converter to support instantaneous load changes. The output voltage of the Boost-inverter is voltage-mode controlled and the DC-DC bidirectional converter is current-mode controlled. The load low-frequency current ripple is supplied by the battery which minimizes the effects of such ripple being drawn directly from the FC itself. Analysis, simulation and experimental results are presented to confirm the operational performance of the proposed system.