The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Joao P. R. A. Mello - One of the best experts on this subject based on the ideXlab platform.

  • Power Rectifier based on open-end converter with floating capacitor under non-sinusoidal and unbalanced input
    2018 IEEE Applied Power Electronics Conference and Exposition (APEC), 2018
    Co-Authors: Alan S. Felinto, Cursino B. Jacobina, Joao P. R. A. Mello, Gregory Arthur De Almeida Carlos, Ivan Da Silva
    Abstract:

    This work studies a three-phase Power Rectifier which consists on an open-end converter composed of two three-phase three-leg converters (converters A and B). Converter A has a floating capacitor on its dc-link. On the other hand, converter B processes Power and has a dc load connected to its dc-link capacitor. The voltage ratio considered is 2:1 to maximize the number of levels symmetrically spaced. A level-shifted PWM strategy is presented and dc-link control strategies are proposed for both converters A and B. The dc-link floating capacitor is controlled by means of the common mode voltage, keeping the PWM levels, and it is performed by a PI controller. Additionally, scenarios with non-sinusoidal and unbalanced grid voltages are discussed. It is shown that it is possible to use the maximum capability of the converter A in the compensation of harmonics and negative sequence. Finally, simulation and experimental results are shown to validate the strategies and scenarios presented.

  • Investigation of Power Rectifier under non-sinusoidal input based on hybrid multilevel converter
    2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017
    Co-Authors: Alan S. Felinto, Cursino B. Jacobina, Edgard L. L. Fabricio, Victor F. M. B. Melo, Joao P. R. A. Mello
    Abstract:

    This paper discusses a Power Rectifier based on a cascaded topology composed of a three-leg cell and three H-bridge cells. Each leg of the three-leg cell is cascaded connected to an H-bridge cell. Since different types of converter are series-connected, the topology is assumed to be hybrid. The capacitors of the H-bridge cells operate as floating capacitors. It is shown that the discussed topology permits the operation even if the grid voltages present harmonic components without the need to increase the capacitor voltages. Control and Pulse Width Modulation strategies are explained in order to adjust the capacitor voltages and grid currents. Simulation and experimental results demonstrate the validity of the discussed strategies and the feasibility of the system. The hybrid topology has its harmonic distortion and semiconductor losses values compared to the ones obtained with the conventional three-leg converter.

L.c. Gomes De Freitas - One of the best experts on this subject based on the ideXlab platform.

  • Programmable PFC Based Hybrid Multipulse Power Rectifier with Sinusoidal Input Line Current Imposed by Digital Controller
    APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition, 2007
    Co-Authors: M.a.a. Freitas, F.r.s. Vincenzi, E. R. Fernandes, R. G. Mendonca, L.c. Gomes De Freitas
    Abstract:

    This paper presents an improved analysis of a novel Programmable PFC Based Hybrid Multipulse Power Rectifier (PFC-HMPR) for utility interface of Power electronics converters. The proposed hybrid multipulse Rectifier is composed by an ordinary three-phase 6-pulse diode-bridge Rectifier (Graetz bridge) with a parallel connection of single-phase switched converters in each three-phase Rectifier leg. In this work, the authors present a novel analysis of the PFC-HMPR operating with sinusoidal input currents. A complete discussion about the controlled Rectifiers Power contribution is also included. The mathematical analysis presented in this paper corroborates with the experimental results of a 2.8 kw prototype implemented in laboratory using digital controller.

  • Programmable PFC based hybrid multipulse Power Rectifier for ultra clean Power application
    IEEE Transactions on Power Electronics, 2006
    Co-Authors: Carlos A. Canesin, Marcelo Godoy Simões, L.c. Gomes De Freitas
    Abstract:

    A novel hybrid three-phase Rectifier is proposed. It is capable to achieve high input Power factor (PF) and low total harmonic input currents distortion (THD/sub I/). The proposed hybrid high Power Rectifier is composed by a standard three-phase six-pulse diode Rectifier (Graetz bridge) with a parallel connection of single-phase Sepic Rectifiers in each three-phase Rectifier leg. Such topology results in a structure capable of programming the input current waveform and providing conditions for obtaining high input Power factor and low harmonic current distortion. In order to validate the proposed hybrid Rectifier, this work describes its principles, with detailed operation, simulation, experimental results, and discussions on Power rating of the required Sepic converters as related to the desired total harmonic current distortion. It is demonstrated that only a fraction of the output Power is processed through the Sepic converters, making the proposed solution economically viable for very high Power installations, with fast investment payback. Moreover, retrofitting to existing installations is also feasible since the parallel path can be easily controlled by integration with the existing dc-link. A prototype has been implemented in the laboratory and it was fully demonstrated to both operate with excellent performance and be feasibly implemented in higher Power applications.

  • Multipulse Power Rectifier without using multiphase transformers
    31st Annual Conference of IEEE Industrial Electronics Society 2005. IECON 2005., 2005
    Co-Authors: E.f. Parreira, Ernane Antônio Alves Coelho, M.a.g. Oliveira, L.c. Gomes De Freitas
    Abstract:

    In this paper it is proposed a novel hybrid three-phase Rectifier capable to achieve high input Power factor (PF), and low total harmonic distortion in the input currents (THD/sub 1/). The proposed hybrid high Power Rectifier is composed by a standard three-phase 6-pulse diode Rectifier (Graetz bridge) with a parallel connection of single-phase boost Rectifiers in each three-phase Rectifier leg. Such topology results in a structure capable of programming the input current waveform and providing conditions for obtaining high input Power factor and low harmonic current distortion. In order to validate the proposed hybrid Rectifier, this paper describes its principles of operation, with detailed experimental results and discussions on Power rating of the required boost converters as related to the desired total harmonic current distortion. It is demonstrated that only a fraction of the output Power is processed through the boost converters, making the proposed solution economically viable for very high Power installations, with fast pay back of the investment. Moreover, retrofitting to existing installations is also feasible since the parallel path can be easily controlled by integration with the existing DC-link. A prototype rated at 6 kW has been implemented in laboratory and fully demonstrated its operation, performance and feasibility to high Power applications.

  • Programmable PFC Based Hybrid Multipulse Power Rectifier for Utility Interface of Power Electronic Converters
    IEEE 36th Conference on Power Electronics Specialists 2005., 1
    Co-Authors: Marcelo Godoy Simões, Ernane Antônio Alves Coelho, Carlos A. Canesin, A. P. Finazzi, L.c. Gomes De Freitas
    Abstract:

    In this paper it is proposed a novel hybrid three-phase Rectifier capable to achieve high input Power factor (PF), and low total harmonic distortion in the input currents (THDI). The proposed hybrid high Power Rectifier is composed by a standard three-phase 6-pulses diode Rectifier (Graetz bridge) with a parallel connection of single-phase boost Rectifiers in each three-phase Rectifier leg. Such topology results in a structure capable of programming the input current waveform and providing conditions for obtaining high input Power factor and low harmonic current distortion. In order to validate the proposed hybrid Rectifier, this paper describes its principles of operation, with detailed experimental results and discussions on Power rating of the required boost converters as related to the desired total harmonic current distortion. It is demonstrated that only a fraction of the output Power is processed through the boost converters, making the proposed solution economically viable for very high Power installations, with fast pay back of the investment. Moreover, retrofitting to existing installations is also feasible since the parallel path can be easily controlled by integration with the existing dc-link. A prototype rated at 6 kW has been implemented in laboratory and fully demonstrated its operation, performance and feasibility to high Power applications

Alan S. Felinto - One of the best experts on this subject based on the ideXlab platform.

  • Power Rectifier based on open-end converter with floating capacitor under non-sinusoidal and unbalanced input
    2018 IEEE Applied Power Electronics Conference and Exposition (APEC), 2018
    Co-Authors: Alan S. Felinto, Cursino B. Jacobina, Joao P. R. A. Mello, Gregory Arthur De Almeida Carlos, Ivan Da Silva
    Abstract:

    This work studies a three-phase Power Rectifier which consists on an open-end converter composed of two three-phase three-leg converters (converters A and B). Converter A has a floating capacitor on its dc-link. On the other hand, converter B processes Power and has a dc load connected to its dc-link capacitor. The voltage ratio considered is 2:1 to maximize the number of levels symmetrically spaced. A level-shifted PWM strategy is presented and dc-link control strategies are proposed for both converters A and B. The dc-link floating capacitor is controlled by means of the common mode voltage, keeping the PWM levels, and it is performed by a PI controller. Additionally, scenarios with non-sinusoidal and unbalanced grid voltages are discussed. It is shown that it is possible to use the maximum capability of the converter A in the compensation of harmonics and negative sequence. Finally, simulation and experimental results are shown to validate the strategies and scenarios presented.

  • Investigation of Power Rectifier under non-sinusoidal input based on hybrid multilevel converter
    2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017
    Co-Authors: Alan S. Felinto, Cursino B. Jacobina, Edgard L. L. Fabricio, Victor F. M. B. Melo, Joao P. R. A. Mello
    Abstract:

    This paper discusses a Power Rectifier based on a cascaded topology composed of a three-leg cell and three H-bridge cells. Each leg of the three-leg cell is cascaded connected to an H-bridge cell. Since different types of converter are series-connected, the topology is assumed to be hybrid. The capacitors of the H-bridge cells operate as floating capacitors. It is shown that the discussed topology permits the operation even if the grid voltages present harmonic components without the need to increase the capacitor voltages. Control and Pulse Width Modulation strategies are explained in order to adjust the capacitor voltages and grid currents. Simulation and experimental results demonstrate the validity of the discussed strategies and the feasibility of the system. The hybrid topology has its harmonic distortion and semiconductor losses values compared to the ones obtained with the conventional three-leg converter.

Brian Flynn - One of the best experts on this subject based on the ideXlab platform.

  • A High-Efficiency Low-Power Rectifier for Wireless Power Transfer Systems of Deep Micro-Implants
    IEEE Access, 2020
    Co-Authors: Liyu Huang, Alan F. Murray, Brian Flynn
    Abstract:

    In this article, the so-called bootstrapping Rectifier (BSR) proposed by Hashemi et al. is re-analyzed, and a novel high-efficiency low-Power Rectifier called Opto-Coupled Dynamic Gate-Control (OCDGC) Rectifier is presented based on the bootstrapping structure. Circuit analysis of BSR shows that the Rectifier design has inherent problems that cause a high forward voltage drop and limit its Power conversion efficiency (PCE). The BSR is simulated and fabricated in TSMC $0.18~\mu \text{m}$ process, and both simulation and experiment results prove the analysis. Inspired by the idea of bootstrapping structure, the presented OCDGC Rectifier utilizes an opto-coupler to control the on-off switching of the active diode to maximize input Power and prevent reverse leakage. A feedback loop is also introduced in the Rectifier to limit the forward voltage drop. The proposed design is simulated in the TSMC $0.18~\mu \text{m}$ process. Simulation results show that, with a 3 MHz input, OCDGC Rectifier is able to achieve more than 80% PCE at an input Power down to 0.55 mW and achieve a forward voltage drop less than 0.1 V. More than 20% PCE improvement is achieved compared with the PCE of BSR.

Azuma Shimizu - One of the best experts on this subject based on the ideXlab platform.

  • High-Power Rectifier using the BSIT operation
    IEEE Transactions on Electron Devices, 1998
    Co-Authors: Koji Yano, Masanobu Kasuga, I. Henmi, Azuma Shimizu
    Abstract:

    A novel high-Power Rectifier using the BSIT (Bipolar mode Static Induction Transistor) operation has been demonstrated. In order to improve the reverse blocking capability of this diode, an ion implanted P-type channel structure is introduced. Device simulations have revealed that, as the tradeoff relationships between reverse blocking voltage, forward voltage drop, and reverse recovery time are considered, there exists an optimum set of the channel dosage and the channel width.

  • Static induction type Power Rectifier
    Proceedings of the 10th International Symposium on Power Semiconductor Devices and ICs. ISPSD'98 (IEEE Cat. No.98CH36212), 1
    Co-Authors: Koji Yano, Masanobu Kasuga, I. Henmi, H. Obara, Azuma Shimizu
    Abstract:

    For application of a static induction type Rectifier to a low voltage Power Rectifier and a high voltage Rectifier, a lateral SOI structure and a P-type channel structure are proposed, respectively. Design methods for these structures are considered by device simulations. The simulations focus on optimization of the thickness of the buried oxide layer for the lateral SOI structure, and on the dosage of the channel for the P-type channel structure, respectively.