Carlos Suchicital

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An innovative technique for packaging power electronic building blocks using metal posts interconnected parallel plate structures

S. Haque Kun Xing Ray‐Lee Lin Carlos Suchicital Guo‐Quan Lu

Power Electronics Building Blocks (PEBBs) are envisioned as integrated power modules consisting of power semiconductor devices, power integrated circuits, sensors, and protection circuits for a wide range of power electronics applications, such as inverters for motor drives and converters for power processing equipment. At Virginia Power Electronics Center (VPEC), we developed a topology for a basic building block-a two-switch two-diode half-bridge converter in totem-pole configuration with built-in gate-driver and protection circuitry, fiber-optic receiver/transmitter interface, and soft-switching capability. Based on the topology, a series of prototype modules, with 600 V, 3.3 kW rating, were fabricated using an innovative packaging technique developed for the program-metal posts interconnected parallel plate structure (MPIPPS). This new packaging technique uses direct attachment of bulk copper, not wire-bonding of fine aluminum wires, for interconnecting power devices. Electrical performance data of the packaged devices show that an air-cooled 15 kW inverter, operating from 400 V dc bus with 20 kHz switching frequency can be constructed by integrating three prototype modules, which is almost double of what could not be achieved with commercially packaged devices of the same rating.

Power Electronics

Power module

Electronic Packaging

Electronic component

10.1109/ectc.1998.678819

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Citations (8)

Piezoelectric Measurements on Ceramic Multilayer Capacitors

IEEE Transactions on Components Hybrids and Manufacturing Technology (1985)

Carlos Suchicital David A. Payne

Piezoelectric measurements are reported for a series of commercial multilayer capacitors which had been previously tested and sold for high-reliability applications. The capacitors conformed to BX specifications and were fabricated from various combinations of barium titanate based dielectric compositions with different electrode materials. Dielectric properties are reported, including distributions in capacitance values and variations in Curie-Weiss behavior. Piezoelectric measurements were made of the d 13 and d 33 coefficients; and data are reported for their distribution in values, and temperature and voltage dependencies. Significant piezoelectric coefficients were detected for capacitors in their as-received conditions. In certain cases the piezoelectric coefficients approached 1000 pC/N. The results are discussed in the context of what effects life-testing conditions may have on dielectric quality. Experiments are also reported for the electric-poling and thermal-depoling of multilayer ceramic capacitors. Concern is expressed for the over-testing of thin layer ceramic devices. Calculations indicate the strain deformation can exceed the elastic limit in certain conditions, resulting in mechanical failure. In addition, the generation of electric charge or potential by mechanical vibration contributes a significant noise to circuit applications. Voltage levels were in the millivoltage range. The study indicates that significant problems may arise in commercial ceramic multilayer capacitors due to a generally unrecognized piezoelectric effect.

Ceramic capacitor

Poling

Barium titanate

Film capacitor

10.1109/tchmt.1985.1136494

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Citations (8)

Ion Beam Mixing of Titanium Overlayers with Hydroxyapatite Substrates

MRS Proceedings (1994)

Timothy E. Levine M. Nastasi T. L. Alford Carlos Suchicital Stephen W. Russell

Overlayer

Ion beam mixing

10.1557/proc-356-791

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Pressure dependence of optical absorption in PbTiO3 to 35 GPa: Observation of the tetragonal-to-cubic phase transition

Journal of Applied Physics (1992)

Chang‐Sheng Zha Andrey G. Kalinichev Jay D. Bass Carlos Suchicital David A. Payne

Optical absorption of the polar material PbTiO3 has been studied up to 35 GPa (350 kbar) in the visible range of wavelengths using a single crystal samples compressed in a diamond anvil high pressure cell. The absorption edge shifts toward lower energies with increasing pressure. Pressure dependence of the absorption edge undergoes significant changes at about 11.5±0.3 GPa, close to the previously identified tetragonal-cubic phase transition. The change in pressure dependence of the spectra is consistent with second-order character of the transition.

Tetragonal crystal system

Absorption edge

Diamond anvil cell

Crystal (programming language)

Cubic crystal system

10.1063/1.352315

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Citations (16)

Flux growth of single crystal lead titanate

Journal of Crystal Growth (1990)

Carlos Suchicital David A. Payne

Lead titanate

Flux method

Crystal (programming language)

10.1016/0022-0248(90)90120-a

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Citations (21)

The effects of ultrasonic cavitation on the dissolution of lithium disilicate glass

Scientific Reports (2022)

Ben Dillinger Carlos Suchicital David E. Clark

There has been little research conducted on how ultrasonic cavitation may affect glass dissolution. The focus of this study was to examine how the mechanisms and kinetics of glass dissolution may change in a system that included ultrasonication. Experiments were conducted on lithium disilicate glass in deionized water at 50 °C between 1 and 7.5 h. Results showed that the erosion from ultrasonication affected the kinetics of glass dissolution. Samples with erosion had 2-3 × more dissolution compared to samples without erosion. The change in dissolution was thought to be partly caused by an increase in the surface area of the sample to volume of solution (SA/V) ratio due to the roughening of the surface and release of particulates and a reduction in the size of the depleted layer due to erosion. Stereoscopic 3D reconstruction of eroded samples was used to calculate the increase in surface area due to erosion. Type 2 surface areas (exfoliation mixed with normal leaching) were roughly 3-6% greater while Type 3 surface areas (heavy roughening of surface) were roughly 29-35% greater than the surfaces areas from Type 1 surfaces (normal leaching).

Sonication

10.1038/s41598-022-24029-4

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Citations (3)

Clathrasils

ACS symposium series (1991)

Hee K. Chae W. G. Klemperer David A. Payne Carlos Suchicital D. R. Wake

Hydrothermal methods were developed for the growth of large, 3 mm-sized crystals of pyridine dodecasil-3C (Py-D3C) from a pyridine-SiO2-HF-H2O system at 190°C. The crystals were acentric at ambient temperature and were weak second harmonic generators. Phase transformations were observed by differential scanning calorimetry to commence at 161 and -46 °C on cooling. The crystal structure of the ambient temperature tetragonal or pseudotetragonal I7SiO2·C5H5N phase was determined using single crystal X-ray diffraction techniques [ a = 13.6620(5) Å, c = 19.5669(7) Å, . = 4, space group I42d- D122d]. The domain structure of this phase was studied using optical microscopy, and domain configurations were manipulated by heat treatment. Scanning electron micrographs strongly suggested that the boundaries of these domains were associated with growth twin boundaries.

Tetragonal crystal system

Acentric factor

Crystal (programming language)

10.1021/bk-1991-0455.ch035

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Citations (11)

Estimate of the crystallization volume fraction in lithium disilicate glass-ceramics using Fourier transform infrared reflectance spectroscopy

Journal of the European Ceramic Society (2014)

Morsi Mahmoud D. C. Folz Carlos Suchicital David E. Clark

Volume fraction

Attenuated total reflection

10.1016/j.jeurceramsoc.2014.09.004

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Citations (19)

Dissolution of lithium disilicate glass under flow conditions

Journal of Non-Crystalline Solids (2022)

Ben Dillinger Carlos Suchicital David E. Clark

Lithium disilicate

Borosilicate glass

10.1016/j.jnoncrysol.2021.121364

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Citations (0)

Work in Progress: Development and Implementation of a Web-Based Resource to Prepare International Faculty for the American Classroom

Christine Burgoyne Maren Roman Carlos Evia Carlos Suchicital Kathy Lu

This paper presents preliminary results of an ongoing faculty study group project on developing an international faculty support system at Virginia Tech. The first stage of this long-term project consists of a Website that will serve as a repository of teaching materials and resources to help new and interested international faculty succeed in the American classroom. While it has been established that students need to be culturally competent in the era of globalization, international faculty are challenged by lack of available resources to prepare themselves for a culturally different classroom. Teachers have expressed interest in the relationship between cultural differences and teaching effectiveness [e.g. issues arise in teaching large engineering classes may be due to cultural barriers that exist between students and teachers]. Developed by the collaborations of the International Faculty Study Group and students from a Web writing course, this Website will serve as the gateway for a more comprehensive international faculty support system

Gateway (web page)

10.1109/fie.2006.322505

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