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> H-bridge Help
Forge
  Posted: October 23, 2009 02:19 am
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I am trying to build a robot and i have been having trouble getting a working h-bridge for my motors and i was wondering if anyone could help me work this out.

i have 2 motors to drive with either a pic or a c-stamp pwm. the motors are HG16-120-AA Operating Voltage 5.4v-6.6v Rated Current 350ma Stall Current 1600ma.

i have some irf530 and irf9630 power mosfets that i think will work for those motors but i am not sure as i have yet to have any luck getting it to work right.

i also have some irl510 mostfets if they would help?

i plan on driving the motors off 4 AA battery's

any help would be greatly appreciated
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JoOngle
Posted: October 23, 2009 02:51 am
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Forge
Posted: October 23, 2009 10:33 pm
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i have tried that design i think a while back but i am not sure if my mosfets are right i am still a noob at all this
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Dr Wattson
Posted: October 24, 2009 04:32 pm
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QUOTE (Forge @ October 23, 2009 10:33 pm)
i have tried that design i think a while back but i am not sure if my mosfets are right i am still a noob at all this

Can you post a labelled schematic of the circuit you have built?
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al1970
Posted: October 28, 2009 06:00 am
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Hi:

6 volts is a little on the low side to run MOSFETs

Al
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Roccivic
Posted: October 28, 2009 02:22 pm
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Here's an h-bridge I built a few years back, it was designed for 12V operation, so you might be a little low with 6V: http://www.placella.com/schematics/h-bridge.png
Note that it will cross-conduct! If you drive both "forward" and "backwards" high, the FETs will go up in smoke.
For the 100kHz square wave in, you could use a 555 in astable mode.

Peace, Rouslan
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Magruder13
Posted: December 06, 2010 10:12 pm
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How many amps will that H Bridge support? I'm working on a 24V H bridge that needs to handle current around 60amps and spikes up to 190A.
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Sch3mat1c
Posted: December 07, 2010 01:26 am
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IRF540 is good for about 5A. The gate driving in that circuit will work to about 24V, and it'll do a fine job driving motors up to 1kHz or so.

Tim


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