Rectifying a very low ac voltage

[guruvigneshwaran]

I'm in need of a rectifier to rectify voltages in the range of 0.05v to 0.15v.

 

[chuckey]

What frequency AC? Why can't you use an Op amp detector circuit.
Frank

 

[darkseid]

Just like Frank said, we can use a precision rectifier using op-amp with a diode in the feedback path, but the current capacity of the circuit will be limited.
Could you please indicate the application of the circuit.

 

[guruvigneshwaran]

I'm in need of rectifying the voltage that is obtained from a piezoelectric crystal. The thing is that no supply should be used as I'm trying to harvest electric energy.

 

[keith1200rs]

For energy harvesting you should use a transformer to step up the voltage. Look at the energy harvesting ICs from Linear Technology for ideas.

Keith

 

[FvM]

Existing piezo energy harvesting solutions (AC input) are using bridge rectifiers and expecting higher input voltages. If the input voltage is considerably lower, one would connect a transformer to the piezo. However, if the piezo output voltage is abround 100 mV, what's the available current? More than µA? Before looking out for a specific converter circuit, I would consider feasibility in terms of available power.

 

[ggiannac]

You need a "Dickson" or a "Greinacher" rf to dc converter with ZVT (Zero Threshold) MOSFETs. Search for these.