I have a 30A 5-30V Single Brushed DC motor driver that will be used with a 12V 30A gear motor.
I have a MegaWatt 36 Amp 12 Volt 13.8V DC Regulated Power Supply that I wanted to use for the driver pwr source. But, I just realized the driver docs say to ALWAYS use a battery as a power source if an inductive load is used.
The docs say that a battery must be used in parallel with the power supply to protect the driver against possible flowback when the motor is stopped.
My question is: can I use a 12V car battery, and simply wire the power supply and motor driver to it, then set pwr supply output to 13.5V? The pwr supply would always remain ON.
Answer
They typical way to handle this it to have a resistor bank that gets switched across the input when the voltage rises beyond some threshold. This absorbs the regenerative energy and dissipates it as heat.
If you can quantify the maximum regen energy you will see in your application you might be able to use a capacitor bank on the input to absorb/reuse the energy. But you have to size the capacitors so that the maximum energy doesn't exceed the maximum input voltage (or the rated voltage of the capacitors.)
The battery in parallel with the supply could result in overcharging, so I would not recommend it.
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