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full-bridge or h-bridge?

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minisan

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pwm full bridge h

hi.. I want to do a four quadrant dc motor drive. Which bridge does I need? Full-bridge or h-bridge? thanks!
 

Davood Amerion

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h-bridge regeneration

hi minisan,

Use full bridge for four quadrant.

Regards,
Davood.
 

    minisan

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minisan

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bridge h regeneration+energy

hi.. thanks!! Mind to share any schematic to do a four quadrant 12V dc motor drive by using full-bridge? I think I am going to use a microcontroller to control the operation and speed of the motor. How to implement PWM? thanks!
 

Davood Amerion

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    minisan

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Davood Amerion

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Hi minisan,

Can this circuit be used to do four quadrant operation? This is a full bridge/h-bridge circuit? Can I connect the PWM output from microcontroller to Point A&B to vary the speed without driver? thanks!!
I think it is not good circuit. but you can use it. and you can connect pins A,B directly to microcontroller.
I recomend to use somthing like this for 4 quadrant operation.
in this circuit each legs controlled seperatly.

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Davood Amerion.
 

    minisan

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minisan

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really thanks davood..
erm.. i m thinking of the forward and reverse regenerative part. Is there any suggestion how to make the motor becomes a generator? Does disconnecting the supply to the circuit a good way to achieve that, with a capasitor(parallel to the power supply) is used to store the charge? thank you very much!
 

Davood Amerion

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Dear Minisan,

with full bridge drive it can achived.
suppose a full bridge ciruit which use battery for power supply.
any time average voltage feeded to motor is lower than motor voltage, i mean motor rotate with higher speed, regenaration start.
This phenomena is like step-up swithing regulator.
its component are (internal) motor self inductance and 4 diodes (paralleled with 4 transistors switch).
returned motor energy going to charge battery.

Note: for regeneration purpose (one leg of) PWM must on full time,
even for ≈0V output voltage.
Other leg must set to high or low, depend on rotation direction.

Regards,
Davood.
 

    minisan

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