On 10/15/2020 09:49 PM, John Dammeyer wrote:
The theory is that if the PWM signal is high the H-Bridge is switched to say
turn the motor clockwise. If the PWM signal is low the H-Bridge is switch to
turn the motor counter clockwise. Therefore with 50% the motor is first asked
to turn one way and then the other. That results in the motor essentially
being locked in place. Change the PWM on either side of 50% and the turns in
the subsequent direction.
This is called synchronous antiphase. The advantage is
there is no dead zone around zero.
The DISadvantage is it causes a triangle-wave current in the
motor which can be quite substantial,
and causes excessive heating of the motor and power transistors.
Jon
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