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21 results on '"Qiu, Jizheng"'

6. A Technology Overview of the PowerChip Development Program

Author

Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology. Microsystems Technology Laboratories, Massachusetts Institute of Technology. Research Laboratory of Electronics, Perreault, David J., Araghchini, Mohammad, Jin, Donghyun, Lim, Seungbum, Lu, Bin, Piedra, Daniel, Sun, Min, del Alamo, Jesus A., DesGroseilliers, Gary, Lang, Jeffrey H., Otten, David M., Palacios, Tomas, Chen, Jun, Doan-Nguyen, Vicky, Harburg, Daniel V., Kim, Jungkwun, Kim, Min Soo, Qiu, Jizheng, Ranson, John, Yu, Xuehong, Yun, Hongseok, Allen, Mark G., Herrault, Florian, Levey, Christopher G., Murray, Christopher B., Sullivan, Charles R., Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology. Microsystems Technology Laboratories, Massachusetts Institute of Technology. Research Laboratory of Electronics, Perreault, David J., Araghchini, Mohammad, Jin, Donghyun, Lim, Seungbum, Lu, Bin, Piedra, Daniel, Sun, Min, del Alamo, Jesus A., DesGroseilliers, Gary, Lang, Jeffrey H., Otten, David M., Palacios, Tomas, Chen, Jun, Doan-Nguyen, Vicky, Harburg, Daniel V., Kim, Jungkwun, Kim, Min Soo, Qiu, Jizheng, Ranson, John, Yu, Xuehong, Yun, Hongseok, Allen, Mark G., Herrault, Florian, Levey, Christopher G., Murray, Christopher B., and Sullivan, Charles R.

Abstract

The PowerChip research program is developing technologies to radically improve the size, integration, and performance of power electronics operating at up to grid-scale voltages (e.g., up to 200V) and low-to-moderate power levels (e.g., up to 50W) and demonstrating the technologies in a high-efficiency light-emitting diode driver, as an example application. This paper presents an overview of the program and of the progress toward meeting the program goals. Key program aspects and progress in advanced nitride power devices and device reliability, integrated high-frequency magnetics and magnetic materials, and high-frequency converter architectures are summarized.

Published
2014

10. A Technology Overview of the PowerChip Development Program

Author

Araghchini, Mohammad, primary, Chen, Jun, additional, Doan-Nguyen, Vicky, additional, Harburg, Daniel V., additional, Jin, Donghyun, additional, Kim, Jungkwun, additional, Kim, Min Soo, additional, Lim, Seungbum, additional, Lu, Bin, additional, Piedra, Daniel, additional, Qiu, Jizheng, additional, Ranson, John, additional, Sun, Min, additional, Yu, Xuehong, additional, Yun, Hongseok, additional, Allen, Mark G., additional, Alamo, Jesús A., additional, DesGroseilliers, Gary, additional, Herrault, Florian, additional, Lang, Jeffrey H., additional, Levey, Christopher G., additional, Murray, Christopher B., additional, Otten, David, additional, Palacios, Tomás, additional, Perreault, David J., additional, and Sullivan, Charles R., additional

Published
2013
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21. Radial-Anisotropy Thin-Film Magnetic Material for High-Power-Density Toroidal Inductors.

Author

Qiu, Jizheng and Sullivan, Charles R.

Abstract

Thin-film nanogranular magnetic materials are attractive for micro-fabricated high-frequency power magnetics, but their anisotropy makes them difficult to use in toroidal geometries. A method to deposit magnetic materials with the radial anisotropy required for high-power-density and high-quality-factor toroidal inductors is discussed in this paper. The radial anisotropy is induced during sputter deposition of magnetic thin films by an applied radial magnetic field. A magnetic field orientation fixture including a permanent magnet and carefully shaped iron pieces for fabricating smaller toroidal cores with down to 1.6-mm inner diameter and up to 5.7-mm outer diameter has been designed and fabricated. Radial-anisotropy toroidal cores with 1.7-mm inner diameter, 5.6-mm outer diameter, 10-micrometer thickness have been fabricated. Hysteresis measurements of fabricated samples showed desired radial anisotropy. Magnetic field orientation fixtures with shared magnets enabling fabricating even smaller toroidal cores are proposed. High-power-density and high-quality-factor toroidal inductors using the radial-anisotropy thin-film magnetic material are optimized for a high-frequency power converter. [ABSTRACT FROM PUBLISHER]

Published
2012

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