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Interfacing Piezoelectric Device with Electric Circuit
Posted 25 mai 2018, 04:14 UTC−4 Electromagnetics, Piezoelectric Devices Version 5.3 2 Replies
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Hi, I am trying to model a piezoelectric device and interface it with the electric circuite interface. The piezoelectric material should create a voltage, between GND and a Terminal which then should be connected to a resisitor. This should lead to a current through the resistor which I want to simulate.
To demonstrate it here I use the piezoelectric tube example from comsol. I added an electric circuite physic and tried to interface it in the before mentioned way, but as soon as I connect the resistor, the electric potential on the terminal goes to zero and the only measureable electric potential is inside the piezo-material. Is there something I am missing? Like conductance through the material or some coupling inbetween the interfaces?
Looking forward to any form of idea or help! Best regards, Matthias
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The stationary condition of any loaded piezoelectric circuit must be a zero current and thus zero voltage across the load. You must conduct a time dependent or frequency domain study to see a current or voltage across the resistive load. The simple physical reason behind is energy conservation.
Cheers Edgar
-------------------Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
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Actually this was it! Thanks a lot!