what is the working principle of precision ac/dc converter ?

Thread Starter

Abdulaziz95

Joined Dec 4, 2015
1
Hi,

I would like you to help me understanding the working principle of "Precision AC/DC converter" circuit.
Also how to calculate the input and output.

Thank you,

SmartSelectImage_٢٠١٥-١٢-٠٢-٠٩-٠٥-٣٩.png
 

Alec_t

Joined Sep 17, 2013
11,517
Welcome to AAC!
Check the entry for "precision rectifier" in Wikipedia for a basic description.
As for the circuit shown, it has no power supply for the op-amps so won't work :) You have to specify, not calculate, the input to that circuit.
 

crutschow

Joined Mar 14, 2008
25,259
The basic principle is that the diode is in the feedback loop so the forward drop of the diode is reduced by the open loop gain of the op amp.
Since the open loop gain of most op amps is very high, the apparent drop of the diode is reduced to the microvolt level.
 
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