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what kind of control do you have?
at a guess I would say (if you have a current-controller) is that you have an offset in yr demand,feedback or gain-blocks (or PWM generation is slightly biased)
too little info (ie lack of cct) to pin it down, but my money on offset
I am trying to charge a battery using charge and burp method... The H bridge current reveral is used to burp (discharge for a short peiod of time). There is also a PWM involved.
I am using a current source...
The difference of current in the directions is as much as between 1.0A and 2.1A
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