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Top picks from Electronica 2014

Posted: 01 Dec 2014     Print Version  Bookmark and Share

Keywords:Electronica  IoT  sensors  microcontrollers  ADAS 

The component is designed as a multi-layer Rosen type piezoelectric transformer: The input side features a multi-layer structure with copper inner electrodes, while the output side of the transformer has a monolithic structure. The 12V input can be boosted to 10kV to 15kV at the output to create the plasma, which is typically only around 50°C.

The voltage transformation is achieved at the resonant frequency of the piezoelectric bar from the formation of a standing acoustic wave, which transforms the low voltage from the input side to a high voltage at the mechanically coupled output side. Because the piezoelectric transformer operates at the second harmonic vibration mode, it can be contacted and mounted at the vibration nodal points without disturbing its mechanical movement. Charges collect on the surface of the dielectric material, where high electric fields are located and discharge within microseconds, leading to their re-formation elsewhere on the surface.

The piezo bar can be integrated easily into different plasma source product concepts such as a handheld device without the need for special high-voltage safety measures, making it much more usable. TDK also supplies the specialised power management board for the device to operate at such a low power.

- Nick Flaherty
  EE Times

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