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How much power can a piezo provide?

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ctyz

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Hi,

i am planning to use a piezo to harvest energy from flying object vibrations (aircraft,missile, etc.). I was wondering is there any piezo to support these energy requirements. This is probably impossible but i am searching it. Can someone give me any information?
 

Hi,

we dont know what piezo type you are using.
So it´s impossible for us to help.

As a general rule: read datasheet. Read general informations about power efficiency of piezo. Contact the manufacturer.

Klaus
 

Energy harvesting with a piezo transducer produces a very low current. You can strongly vibrate a piezo for hours and its output can be rectified then it can charge a capacitor. The small amount of stored energy can blink an LED for a short duration one time.

A piezo transducer fastened to an aircraft or missile engine will pick up its strong vibrations and produce a voltage but a very small current. A piezo as a microphone produces a very low voltage and almost unmeasureable current. The voltage might be too low to use a rectifier then it cannot charge a capacitor. Thousands of piezos connected in parallel might produce a voltage and a small current if they are near an aircraft or missile.
 

A piezo transducer will produce currents in the range of pA and perhaps you will need square meters of transducer to get some usable current. For example, the gas lighter (piezo based) produces a spark that has about a few nJ (or uJ??) of energy. But the crystal is about 1mmX1mm and the voltage is about 2-5kV.

The material ("the piezo crystal") is basically an insulator and the current is essentially a capacitive current. Therefore a simple rectifier will not do...
 

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