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During t3-t4, only Q3 is ON shown with black arrow.

On the bottom-right of the picture, primary voltage and primary coil current increases towards negative.

I don't understand how the primary waveforms increases in negative way with only Q3 on?

During t3-t4, Cds of Q1 charges and Cds of of Q2 discharges.

enter image description here

Source: https://www.youtube.com/watch?v=2F9BsGcD1Ok&t=581s

enter image description here Source: https://www.ti.com/lit/an/slua107a/slua107a.pdf?ts=1726667235613

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  • \$\begingroup\$ The picture looks wrong to me. Maybe find a better resource. \$\endgroup\$
    – Andy aka
    Commented Oct 8 at 12:21

1 Answer 1

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I don't recognize your image as showing normal phase shifted PWM. From my own notes, it should look more like this (a resonant version): -

enter image description here

enter image description here

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    \$\begingroup\$ Apart from the dead time, there should always be two activated MOSFETs @Mhan \$\endgroup\$
    – Andy aka
    Commented Oct 8 at 13:02
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    \$\begingroup\$ @Andyaka I don't see any source given in your answer other than "my notes" \$\endgroup\$
    – Ken Grimes
    Commented Oct 13 at 8:36
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    \$\begingroup\$ @Andyaka it would be a lot easier overall, and help the moderators as well, if you would interact with the user over the query re the source rather than ramping up. This is a can pretty ambiguous situation which the moderator would have to dig into and waste unnecessary time on. Working together would be appreciated. \$\endgroup\$
    – Russell McMahon ♦
    Commented Oct 13 at 19:04
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    \$\begingroup\$ Have a downvote for your poorly sourced answer. You could have saved yourself a downvote if you'd simply stated your source rather than invoking the moderators for something you have to fix anyway. \$\endgroup\$
    – Null ♦
    Commented Oct 14 at 13:44
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    \$\begingroup\$ @Andyaka I honestly feel that you are ramping up what started as minor into something which is getting out of hand. YES I know that sometimes standing on ceremony seems to be the right thing to do - ask my wife sometime about me on occasions ! :-). BUT from where I'm looking it doesn't seem that what Ken said was serious criticism. Really. He said 'I don't see any source given in your answer other than "my notes" ' --> I feel (perhaps wrongly) that something like "I drew the diagrams" would have been a good reply. Arguably you are not obliged to say that IF you did draw them, but it closes ... \$\endgroup\$
    – Russell McMahon ♦
    Commented Oct 14 at 14:53

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