H-BRIDGE schematics

Discussion in 'The Projects Forum' started by reviser, Sep 26, 2013.

  1. reviser

    Thread Starter New Member

    Sep 25, 2013
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    I'm developing an h-bridge to control the speed and direction of rotation of a DC motor.
    The motor I need to control is 24V 10A.
    I've created a schematic for the the h-brigde but I'd like to hear some opinions about the overall schematic and/or the specific components I've selected.
    Any suggestion is welcome.

    [​IMG]
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Plenty of H bridge circuits out there.
    Need to see yours before we comment though! ;)
    Max.
     
  3. reviser

    Thread Starter New Member

    Sep 25, 2013
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    The schematic image isn't showing don't know why.
    You need to open it on other window to see it.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    What format is it in?
    Max.
     
  5. reviser

    Thread Starter New Member

    Sep 25, 2013
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    It's an URL for a .png image.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Down load it an convert to JPG or PDF?
    Max.
     
  7. reviser

    Thread Starter New Member

    Sep 25, 2013
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    You can see the image by right-clicking with your mouse and select "Open image on new tab"
     
  8. Experimentonomen

    Member

    Feb 16, 2011
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    For me there isent even a faulty link, all i get is the post rext but no sign of any image or any link to one.
     
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Maybe you can, or there must be something I am missing?
    Max.
     
  10. Experimentonomen

    Member

    Feb 16, 2011
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    I guess he entered a search path on his own computer in the image url thing, which would explain why not even the "link" shows up.
     
  11. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    To upload your schematic file you need to click 'Go Advanced', then scroll down and click 'Manage attachments', then 'Browse' then 'Upload'.
     
  12. reviser

    Thread Starter New Member

    Sep 25, 2013
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    I've uploaded the image to an host and then copied the link.

    schematic
     
  13. MaxHeadRoom

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    Jul 18, 2013
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    I have tended to use logic level gate Mosfets when driven by 5v logic.
    Max.
     
  14. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Here is one I used with a PICmicro.
    Max.
     
    Last edited: Sep 30, 2013
  15. Experimentonomen

    Member

    Feb 16, 2011
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    The one he posted is correct and proper, depending on his choice of fets, this H-bridge can pull several kiloWatts.

    I use almost that exact thing in my class d amplifier and bldc motor drive stuff.

    All N-channel is the way to go, P-channel mosfets are a PITA to deal with, especially at higher bus voltages.
     
  16. ronv

    AAC Fanatic!

    Nov 12, 2008
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    The bootstrap caps seem pretty big, but having said that are you aware that it cannot run at 100% speed (always on).
     
  17. reviser

    Thread Starter New Member

    Sep 25, 2013
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    My experience on the electronics field is a bit limited.
    If anyone would like to suggest which components would be better instead of the ones I chose, it would be really appreciated.
     
  18. Experimentonomen

    Member

    Feb 16, 2011
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    100nf-1µF om the bootstrap cap and 100-1000µF + and 100nF on the low side.
     
  19. ronv

    AAC Fanatic!

    Nov 12, 2008
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    Take a look at the HIP4081 to replace your 2 IR2110's. Then you can still use all NFETs and it will run at full power..
     
  20. SgtWookie

    Expert

    Jul 17, 2007
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    Here is the image:
    [​IMG]
    In the future, please upload your image to this Board. Use the "Go Advanced" button below the text box, then click the "Manage Attachments" button on the bottom of the next dialog.

    .PNG-format images are actually the best to use here, as the image files are quite compact, are not "lossy" like .jpg are, and require no software other than a browser to view.

    The 1k resistors R3 thru R6 will drain your boost caps far too quickly.

    1N4007 diodes will recover far too slowly; you should use Schottky or switching diodes. 1N5818 or 1N5819 are likely Schottky candidates; 1N914/1N4148 might also be used.

    You need to have the proper caps on both sides of the regulators and located as closely as possible to them. Without them, you will likely wind up with oscillators instead of regulators. See the datasheets. I suggest that you have at least a 100uF cap on your 24v input supply.

    You will need to turn on the lower two MOSFETs in order to initially charge the boost caps; otherwise there won't be a ground path for the boost caps. As has already been mentioned, you won't be able to keep the high-side MOSFETs turned on for very long before the boost caps drain.
     
    Last edited: Oct 1, 2013
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