The theory of the high pass filter to remove 2.5 Vdc offset

Hi,

    I have some question for the high pass filter to measure Voltage signal for the power monitor.

=-----------------------------------------------------------------------------------------------------

//Apply digital high pass filters to remove 2.5V DC offset (centred on 0V).
//-----------------------------------------------------------------------------
filteredV = 0.996*(lastFilteredV+sampleV-lastSampleV);

 

Can anyone can explain the theory behind this?

Robert Wall's picture

Re: The theory of the high pass filter to remove 2.5 Vdc offset

calypso_rae's picture

Re: The theory of the high pass filter to remove 2.5 Vdc offset

There's a similar thread, with plenty of discussion, at http://openenergymonitor.org/emon/node/932

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