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  • Author Author: Robert Peter Oakes
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The Modular Bench Power Supply ++, Getting the higher voltages for high side MOSFETS

Robert Peter Oakes

Again, I have been busy making videos and want them to be available to view, I will be following up with diagrams to go with this in the next little while

 

In this video I show the basics of a voltage doubler using a classic design but as you will see, there are a few minor issues, I will be following up with an alternative approach if you go ahead with a toroidal transformer for you PSU

  • Hi Peter,

    The physics say that if the transformer was truly in saturation there should be no voltage output in the secondary as dB/dt will have gone to zero and induction will have stopped. If you can set up the experiment again and turn off the vector output of your scope we should be able to see if voltage is lost in the time period that looked like a clip before. I can see no way for a transformer to put out a DC voltage into a purely resistive load as the clipping seemed to indicate. If your scope will plot only data points we should get a clearer indication of what is happening.

    John

  • in reply to jw0752

    I was heavily overloading the transformer and as a wild guess I suspect the magnetics may have been saturated in this mode, I have no proof or technical evidence for this but it seems plausible, anyone else have a more tangible explanation, we would love to hear it

  • Hi Peter,

    Ever since I watched your video last night I have been scratching my head over the clipping that we saw when you put a resistive load on the AC voltage of the secondary of the transformer. As far as my limited understanding goes I believe that you can load an AC voltage with a passive resistance right down to almost 0 volts without loosing the full sine wave. Is it possible that you were using an active component to load the 24 VAC or were there other active components involve in the production of the 24 VAC sine wave? I know you also noticed this problem and I just wanted to know that my curiosity has been peaked.

    John

  • Hi Peter,

    Thanks for continuing your power supply series. I have watched this video and found it very informative. I am away from my shop and so I can't prototype the circuits as I usually like to do but I have book marked the videos and I will follow through when I can.

    John