Hi
I started the development of a new project for the control of a Brushed DC motor 100W 24V.
I was thinking of using the Texas DRV8701 to control the bridge (the motor must turn in both directions)
Since I powered the circuit with a swtiching when I want to brake the motor I can't make a regenerative braking but I think to dissipate energy in a resistor. I wanted to insert a resistor in parallel to the motor during braking but I don't understand how to do it.
The procedure I thought to follow was to open the bridge mosfets at this point, while the motor is spinning due to inertia, the voltage must necessarily rise over VM (bridge supply) in order to maintain the current circulation. At this point I close the braking resistor path and I thought to put a diode to protect my switching power supply. But as soon as motor decelerate and voltage drops below the supply voltage it is no longer able to circulate current and no longer brakes but continue turns freely.
I don't understand how to set the braking to keep until the engine stops.
I started the development of a new project for the control of a Brushed DC motor 100W 24V.
I was thinking of using the Texas DRV8701 to control the bridge (the motor must turn in both directions)
Since I powered the circuit with a swtiching when I want to brake the motor I can't make a regenerative braking but I think to dissipate energy in a resistor. I wanted to insert a resistor in parallel to the motor during braking but I don't understand how to do it.
The procedure I thought to follow was to open the bridge mosfets at this point, while the motor is spinning due to inertia, the voltage must necessarily rise over VM (bridge supply) in order to maintain the current circulation. At this point I close the braking resistor path and I thought to put a diode to protect my switching power supply. But as soon as motor decelerate and voltage drops below the supply voltage it is no longer able to circulate current and no longer brakes but continue turns freely.
I don't understand how to set the braking to keep until the engine stops.