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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Piezoelectric power

Posted 18.10.2011, 09:42 GMT-4 MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Structural Mechanics Version 3.5a 10 Replies

Jagan Mohan Reddy Kudimi
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hi! all
I have designed the piezoelectric energy harvester structure in COMSOL. I have doubt regarding finding power. I found that current will be obtained by integrating the current density. Here is my doubt, generally to get power is to multiply voltage and current, but in COMSOL we will get open circuit voltage and current. In this situation it is right way to multiply open circuit voltage and current to get power without load. Another doubt is that I tried to connect the resistor to my piezo model through SPICE netlist but it is not working. Please clarify my doubts and grateful to help me.

Thank You
Jagan
10 Replies Last Post 30.12.2013, 00:06 GMT-5
Jagan Mohan Reddy Kudimi
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Posted: 1 decade ago 18.10.2011, 22:30 GMT-4
hi!

I tried to connect the resistor to a piezo model, but it is not working. Please help me in SPICE netlist.

Thanks,
Jagan
hi! I tried to connect the resistor to a piezo model, but it is not working. Please help me in SPICE netlist. Thanks, Jagan
Jagan Mohan Reddy Kudimi
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Posted: 1 decade ago 19.10.2011, 00:20 GMT-4
Hi! again,

I tried the SPICE netlist to connect the resistor to the piezo model and finally I connected the resistor to the piezo model. But when I change the resistor value, the output voltage doesn't change with load resistor. Can any one give solution this problem.

Thanks
Jagan
Hi! again, I tried the SPICE netlist to connect the resistor to the piezo model and finally I connected the resistor to the piezo model. But when I change the resistor value, the output voltage doesn't change with load resistor. Can any one give solution this problem. Thanks Jagan
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 19.10.2011, 01:52 GMT-4
Hi

but does the current change ? and the total power ?

--
Good luck
Ivar
Hi but does the current change ? and the total power ? -- Good luck Ivar
Jagan Mohan Reddy Kudimi
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Posted: 1 decade ago 19.10.2011, 02:30 GMT-4
Hi! Ivar,

Yes current and power are changing with respect to the load resistor.

Thanks,
Jagan
Hi! Ivar, Yes current and power are changing with respect to the load resistor. Thanks, Jagan
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 19.10.2011, 02:40 GMT-4
Hi

but then it's perhaps normal that the voltage is not changing.

As the PZT is a voltage to displacement (and reciprocal) transducer,
just like a voice coil is a current to force transducer,

or ?

--
Good luck
Ivar
Hi but then it's perhaps normal that the voltage is not changing. As the PZT is a voltage to displacement (and reciprocal) transducer, just like a voice coil is a current to force transducer, or ? -- Good luck Ivar
Edgar Kaiser
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Posted: 1 decade ago 19.10.2011, 03:06 GMT-4
Hi,

In order to maximize the power output of the piezoelectric device you must find the correct impedance match, i.e. your load resistor must be equal to the impedance of the source. I would suggest to do a parameter study for the load resistor to see which value gives maximum power.

Cheers
Edgar
Hi, In order to maximize the power output of the piezoelectric device you must find the correct impedance match, i.e. your load resistor must be equal to the impedance of the source. I would suggest to do a parameter study for the load resistor to see which value gives maximum power. Cheers Edgar
Jagan Mohan Reddy Kudimi
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Posted: 1 decade ago 19.10.2011, 03:37 GMT-4
Thanks Ivar
Thanks Ivar
Jagan Mohan Reddy Kudimi
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Posted: 1 decade ago 19.10.2011, 03:38 GMT-4
Thanks Edgar
Thanks Edgar
Oussama Trabelsi
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Posted: 1 decade ago 09.08.2012, 09:24 GMT-4
how did you connect the resistor to the piezo model?? i need help .
how did you connect the resistor to the piezo model?? i need help .
venkatesh
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Posted: 1 decade ago 30.12.2013, 00:06 GMT-5
Hi
Can yo tell me how to connect resistor using SPICE netlist
Hi Can yo tell me how to connect resistor using SPICE netlist

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