Electronics > Beginners

How to set an exact voltage at the load?

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Deva:
Hey guys,
I would like to develop a source meter for photo voltaic application(+2V to -2V).Can any one suggest me a source circuit for my experiment.

Dave:
To answer your topic: Sense lines for voltage feedback. Pretty much all SMUs have them, as do many of the better power supplies.

David Hess:
Are you looking for a circuit for an entire source meter or just what is required to add remove sense to a regulator?  The later is pretty easily done in a few different ways as shown below.

If you want a +/-2 volt range, then you need something more like a class-B or class-AB output stage with remote sense.

Note that with remote sense, you can place a current meter in series with the output and not affect the voltage at the remote sense point.

Deva:
Hi David ,
Thank you very much for the reply.

--- Quote from: David Hess on December 11, 2018, 05:05:12 pm ---Are you looking for a circuit for an entire source meter or just what is required to add remove sense to a regulator?  The later is pretty easily done in a few different ways as shown below.

If you want a +/-2 volt range, then you need something more like a class-B or class-AB output stage with remote sense.

Note that with remote sense, you can place a current meter in series with the output and not affect the voltage at the remote sense point.

--- End quote ---
Can I use this  remote sensing circuit for measuring current measurement (10uA to 1A) with  series resistors 10K, 100R and 1R operated by relays?
 

David Hess:

--- Quote from: Deva on December 12, 2018, 05:03:12 am ---Can I use this  remote sensing circuit for measuring current measurement (10uA to 1A) with  series resistors 10K, 100R and 1R operated by relays?
--- End quote ---

Sure that will work.  The sense resistors could even be switched by power MOSFETs.  The remote sense will remove the voltage drop from the sense resistors and any switch.

But like I said, if you want an output which can go both positive and negative, a different output stage will be required than a simple voltage regulator.  It will resemble an audio power amplifier output stage.

If you want to measure currents that low, then some attention will need to be paid to make the remote sense circuit not draw too much current itself but that is not difficult.  Remove sense bias currents from nanoamps to picoamps are easily feasible using operational amplifiers as buffers.

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