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
    432
    7
    what is the difference between a half bridge and a push/pull configuration?
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,440
    3,361
    Can you please elaborate and give us more information and examples?
     
  3. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
    432
    7
    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
    12,440
    3,361
    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
    2,936
    488
    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
    432
    7
    thank you! that explains it.
     
Loading...