| Switching frequency response characteristics of a low cost wireless power driving and controlling system for electrically tunable liquid crystal microlenses. | |
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MedLine Citation:
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PMID: 21280848 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The essential switching frequency response characteristics of a low cost wireless power driving and controlling system for electrically tunable liquid crystal microlenses (ETLCMs) are obtained. The wireless power system is mainly composed of two coils with different radius and winding as well as a power metal-oxide-semiconductor field effect transistor switch. The voltage response in the small coil, which is connected directly with ETLCMs, is measured and analyzed under the condition of changing some key parameters of the coil system, such as the width of switching frequency region and the duty-cycle of the switching signal ranging from 20% to 80% in intervals of 20%. Through extending the switching frequency range to a few hundreds of kilohertz, an attractive property of only modulating switching frequency to tune precisely the rms voltage in the small coil for ETLCMs is presented. Some interesting phenomena in high frequency regions, for instance, the rms voltage being stable or slightly changed as the frequency, the voltage response cutoff or disappearance after the frequency surpassing a threshold value, and then regeneration after lowering the frequency to lower frequency point than that of generating voltage response cutoff during increasing frequency, are also discovered. |
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Authors:
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Xinyu Zhang; Hui Li; Kan Liu; Jun Luo; Changsheng Xie; An Ji; Tianxu Zhang |
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Publication Detail:
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Type: JOURNAL ARTICLE |
Journal Detail:
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Title: The Review of scientific instruments Volume: 82 ISSN: 1089-7623 ISO Abbreviation: - Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-2-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0405571 Medline TA: Rev Sci Instrum Country: - |
Other Details:
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Languages: ENG Pagination: 014701 Citation Subset: - |
Affiliation:
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Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province, ChinaNational Key Laboratory of Science and Technology on Multispectral Information Processing, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province, ChinaInstitute for Pattern Recognition and Artificial Intelligence, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province, ChinaInstitute of Semiconductors, The Chinese Academy of Sciences, Beijing 100083, China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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