half bridge vs push pull

Discussion in 'General Electronics Chat' started by lokeycmos, Aug 4, 2012.

  1. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
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    what is the difference between a half bridge and a push/pull configuration?
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    Can you please elaborate and give us more information and examples?
     
  3. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
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    there are a lot of flyback transformer driver schematics. many of them have 2 transistors that switch a primary winding. ive heard them referred to as half bridge and some reffered to as push pull. i believe the two attachments are an example of each.
     
  4. MrChips

    Moderator

    Oct 2, 2009
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    Hah! Now we know what you are referring to.

    A push-pull output driver gives you twice the bang for your buck.
     
  5. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    A halfbridge usually has two switches and two capacitors to maintain a middle voltage between the positive and negative of the DC- bus. So what you posted is a halfbridge. The transformer works with one primary winding.

    A push-pull usually has two windings on the primary, so polarity is switched by energizing the two windings alternately.

    Read here: http://www.st.com/internet/com/TECH...AL_LITERATURE/APPLICATION_NOTE/CD00003910.pdf

    Figure 11, figure 12
     
  6. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
    431
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    thank you! that explains it.
     
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