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Juan Carlos Balda

Bio: Juan Carlos Balda is an academic researcher from University of Arkansas. The author has contributed to research in topics: Power module & Converters. The author has an hindex of 29, co-authored 180 publications receiving 3468 citations. Previous affiliations of Juan Carlos Balda include Clemson University & University of Arkansas at Little Rock.


Papers
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Proceedings ArticleDOI
15 Mar 2015
TL;DR: The digital control of a 750-kW dc supply that converts a 480-V three-phase ac input voltage to an adjustable dc output voltage which has the maximum voltage value of 600 V is presented in this paper.
Abstract: The digital control of a 750-kW dc supply that converts a 480-V three-phase ac input voltage to an adjustable dc output voltage which has the maximum voltage value of 600 V is presented in this paper. Digital control is important for achieving precise data acquisition and proper operation of power electronic equipment. In addition to power semiconductor switching signals, several fault and warning signals from the power converter must be considered. Providing sufficient inputs/outputs (I/Os) and high-speed parallel processing, the fieldprogrammable gate array (FPGA) is one of the best candidates to accomplish the tasks mentioned above. In the proposed FPGA application, all functions including analog-to-digital conversion (ADC), power electronic converter algorithms, data interface, and protection logic for the dc supply are implemented in one single cheap FPGA which operates at a 25 MHz clock. All programming of the FPGA is completed by manual coding of hardware description language - the Very high speed integrated circuit Hardware Description Language (VHDL). A small-scale prototype is built and tested to provide further verification of the VHDL code prior to final implementation of the 750-kW prototype. The validity of control algorithms and FPGA functions are verified by simulations using Matlab/SimulinkTM Xilinx ISETM, respectively, prior to implementation in the hardware prototype.

2 citations

Proceedings ArticleDOI
01 Apr 2017
TL;DR: In this article, a topology consisting of four modular multilevel converters and three medium-frequency single-phase transformers is used to realize a mobile power substation based on power electronics (PE-MPS).
Abstract: Mobile power substations (MPSs) are normally installed on truck beds for ease of transportation when it necessary to provide an interface between two medium-voltage distribution systems under emergency conditions. A topology consisting of four modular multilevel converters (MMCs) and three medium-frequency single-phase transformers (MFT) is used to realize a mobile power substation based on power electronics (PE-MPS). Taking into account tradeoffs among transformer efficiency, volume and weight, Δ-Y and Y-Δ connection modes of the MFTs operating at 1 kHz are analyzed. The design methodology is presented for the MFT with emphasis on weight and volume, and demonstrated through a design example for a 2-MVA MFT. Simulation waveforms when using the selective harmonic elimination (SHE) algorithm complement the paper.

2 citations

Proceedings ArticleDOI
28 Sep 2020
TL;DR: In this paper, the authors present the modeling and characterization of 10-kV SiC MOSFET modules used for medium-voltage distribution system applications, which includes the nonlinearities present at steady-state like transfer characteristics and the behavior in the Ohmic region.
Abstract: This work presents the modeling and characterization of 10-kV SiC MOSFET modules used for medium-voltage distribution system applications. In addition to the nonlinear junction capacitances of the devices, the model includes the non-linearities present at steady-state like transfer characteristics and the behavior in the Ohmic region, which allows to increase the accuracy of the SiC MOSFET model. Furthermore, the parasitic inductances in the circuit (such as the source inductance shared by the power stage and driver loop and the drain inductance) are considered in the model since it has been demonstrated previously that it influences the total losses. By using the proposed model, the calculated voltage and current transients show a good match with the experimental results.

2 citations

Proceedings ArticleDOI
J.A. Carr1, D. Hotz1, Juan Carlos Balda1, H. Alan Mantooth1, A. Ong1 
15 Oct 2007
TL;DR: This paper deals with the design of a 300 W 100 kHz dc-dc full bridge converter using zero-voltage zero-current switching (ZVZCS) for comparison of SiC MOSFETs and diodes against Si MOSfETs
Abstract: Distributed energy resources (DER) will become in the near future an integral component of an electric power distribution system. In most cases, an isolated dc-dc converter is required to connect the DER output to the distribution system. Operation of the converter at high switching frequencies brings size reduction of passive components at the expense of increased switching losses. On the loss issue, silicon carbide (SiC) power devices have a very promising future because of their lower switching losses and ability to work at high temperatures. SiC diodes have displayed the ability to offer more ideal diode behavior than silicon diodes. SiC MOSFETs also have lower switching losses and conduction losses over Si MOSFETs. This display has made SiC devices attractive for dc-dc converters used to connect DER to the distribution system. In particular, this paper deals with the design of a 300 W 100 kHz dc-dc full bridge converter using zero-voltage zero-current switching (ZVZCS) for comparison of SiC MOSFETs and diodes against Si MOSFETs and diodes.

2 citations

Proceedings ArticleDOI
02 Oct 1993
TL;DR: An analysis of the results obtained seems to indicate that distribution transformers are moderatley derated by the type of VSHP considered here.
Abstract: The influence of a large concentration of variable-speed high-efficiency heat pumps (VSHPs) on the derating of residential single-phase distribution transformers and the quality of electric power is investigated. The harmonic power flow computer program HARMFLO is used to determine the derating of a 50 kVa single-phase distribution transformer supplying the VSHP nonsinusoidal load current. The VSHP is modeled as a fixed-harmonic load whose harmonic spectra were obtained from field measurements. The variations of the voltage total harmonic distortions and the system harmonic I/sup 2/R losses are evaluated for different VSHP penetration levels throughout the distribution system. An analysis of the results obtained seems to indicate that distribution transformers are moderatley derated by the type of VSHP considered here. >

2 citations


Cited by
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01 Sep 2010

2,148 citations

Journal ArticleDOI
TL;DR: In this article, a review of recent progresses in the development of SiC- and GaN-based power semiconductor devices together with an overall view of the state of the art of this new device generation is presented.
Abstract: Wide bandgap semiconductors show superior material properties enabling potential power device operation at higher temperatures, voltages, and switching speeds than current Si technology. As a result, a new generation of power devices is being developed for power converter applications in which traditional Si power devices show limited operation. The use of these new power semiconductor devices will allow both an important improvement in the performance of existing power converters and the development of new power converters, accounting for an increase in the efficiency of the electric energy transformations and a more rational use of the electric energy. At present, SiC and GaN are the more promising semiconductor materials for these new power devices as a consequence of their outstanding properties, commercial availability of starting material, and maturity of their technological processes. This paper presents a review of recent progresses in the development of SiC- and GaN-based power semiconductor devices together with an overall view of the state of the art of this new device generation.

1,648 citations

Journal ArticleDOI
TL;DR: In this paper, the dual-active-bridge (DAB) isolated bidirectional dc-dc converter (IBDC) serves as the core circuit of high frequency-link (HFL) power conversion systems.
Abstract: High-frequency-link (HFL) power conversion systems (PCSs) are attracting more and more attentions in academia and industry for high power density, reduced weight, and low noise without compromising efficiency, cost, and reliability. In HFL PCSs, dual-active-bridge (DAB) isolated bidirectional dc-dc converter (IBDC) serves as the core circuit. This paper gives an overview of DAB-IBDC for HFL PCSs. First, the research necessity and development history are introduced. Second, the research subjects about basic characterization, control strategy, soft-switching solution and variant, as well as hardware design and optimization are reviewed and analyzed. On this basis, several typical application schemes of DAB-IBDC for HPL PCSs are presented in a worldwide scope. Finally, design recommendations and future trends are presented. As the core circuit of HFL PCSs, DAB-IBDC has wide prospects. The large-scale practical application of DAB-IBDC for HFL PCSs is expected with the recent advances in solid-state semiconductors, magnetic and capacitive materials, and microelectronic technologies.

1,306 citations

Journal ArticleDOI
TL;DR: In this paper, the authors comprehensively review and classify various step-up dc-dc converters based on their characteristics and voltage-boosting techniques, and discuss the advantages and disadvantages of these voltage boosting techniques and associated converters.
Abstract: DC–DC converters with voltage boost capability are widely used in a large number of power conversion applications, from fraction-of-volt to tens of thousands of volts at power levels from milliwatts to megawatts. The literature has reported on various voltage-boosting techniques, in which fundamental energy storing elements (inductors and capacitors) and/or transformers in conjunction with switch(es) and diode(s) are utilized in the circuit. These techniques include switched capacitor (charge pump), voltage multiplier, switched inductor/voltage lift, magnetic coupling, and multistage/-level, and each has its own merits and demerits depending on application, in terms of cost, complexity, power density, reliability, and efficiency. To meet the growing demand for such applications, new power converter topologies that use the above voltage-boosting techniques, as well as some active and passive components, are continuously being proposed. The permutations and combinations of the various voltage-boosting techniques with additional components in a circuit allow for numerous new topologies and configurations, which are often confusing and difficult to follow. Therefore, to present a clear picture on the general law and framework of the development of next-generation step-up dc–dc converters, this paper aims to comprehensively review and classify various step-up dc–dc converters based on their characteristics and voltage-boosting techniques. In addition, the advantages and disadvantages of these voltage-boosting techniques and associated converters are discussed in detail. Finally, broad applications of dc–dc converters are presented and summarized with comparative study of different voltage-boosting techniques.

1,230 citations

Journal ArticleDOI
TL;DR: This paper presents a review of ESSs for transport and grid applications, covering several aspects as the storage technology, the main applications, and the power converters used to operate some of the energy storage technologies.
Abstract: Energy storage systems (ESSs) are enabling technologies for well-established and new applications such as power peak shaving, electric vehicles, integration of renewable energies, etc. This paper presents a review of ESSs for transport and grid applications, covering several aspects as the storage technology, the main applications, and the power converters used to operate some of the energy storage technologies. Special attention is given to the different applications, providing a deep description of the system and addressing the most suitable storage technology. The main objective of this paper is to introduce the subject and to give an updated reference to nonspecialist, academic, and engineers in the field of power electronics.

1,115 citations