A passive DC current sensing methodology
| Autor: | Huan Liu, Yang Li, Weikang Xian, Dong F. Wang, Xiaodong Li |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Power cord Materials science Cantilever Physics and Astronomy (miscellaneous) business.industry Electrical engineering 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity Magnetic field Amplitude Smart grid 0103 physical sciences Electronics 0210 nano-technology business Voltage |
| Zdroj: | Applied Physics Letters. 109:163503 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | This paper proposes a method for passive sensing a two-wire DC current without using any cord separator. In this method, a piezoelectric thin-film cantilever with a micro-magnet on its end is positioned near a power cord. The DC current in the power cord induces a magnetic field, which generates a magnetic force acting on the micro-magnet. Consequently, the piezoelectric cantilever is bent and induces an output voltage that is sensitive to small variations of DC currents. A prototype device has been fabricated and experimentally studied. It was found that the initial peak amplitude of the piezoelectric output voltage increases linearly with the DC current value upon “ON-OFF” switching. Compared to the Hall-effect based sensing, this method has the advantages of no need of driving voltage or cord separators even for two-wire appliance cords. Apart from the conventional consumer electronics, this method may have a wide application foreground in the new emerging fields, such as energy vehicles, lithium ion battery, or smart power grid. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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