Synchronous Rectification

[Diminus]

Hi all,

I had to implement a synchronous rectification ("Redressement synchrone in french") in Labview and I don't know how to do.
The aim is to do rectification with an acquisition which is in synchronization (or not) with a reference pulse.


Below the circuit in multisim :

4066BD_5V is a simple switch : Pulse high -> on (5V) Pulse low -> GND

The circuit works fine, I juste had to do this implementation in Labview.

Thanks for your help.

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[johnsold · Accepted solution]

I wanted to study synchronous rectification for my thesis project many years ago (before switches like the 4066 were available).

Consider the voltage at U2-R1-U1A. It is either equal to the voltage V4 or it is approximately zero (depending on whether you are ignoring the on resistance of the switch). At the output of U1A you will have a similar signal except of opposite pahse with respect to the the reference signal V1.

So, the question becomes: How do you implement modifying the signal V4 according to the value of V1?

One way to do this would be to compare the V1 signal to a threshold (zero volts seems reasonable). Convert the boolean output of the comparison to (0,1) and mutliply V4 by the result.

Lynn

[Diminus]

Hi Lynn,

thanks for your answer.

I use the function comparison and multiply V4 by the result of the comparison (whitout using a boolean to (0,1) converter because I have uncompatible data types error),

it works great !


Thanks a lot,

Diminus

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