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Dynamic Braking with minimal components [SOLVED]
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Zero999:

--- Quote from: anishkgt on January 02, 2019, 08:12:57 am ---Here are some pics from my Dremel

The schematic is reverse engineered, i think i've got it correctly.

--- End quote ---
It looks wrong to me.

Q1 should be P-channel, otherwise it will do nothing. The current will just flow though the body diode. D1 should be in parallel with the motor, so it acts as a freewheel diode.
anishkgt:
My previous schematic was incomplete as the PCB was not clear. I've removed all the components and looks good now.

D1 is a dual diode with common Anode. The working is like this when in the OFF State as seen in the schematic, current flows from M2 through D1 and into the M1 of the motor. Making it a dead short aka Dynamic Brake.

In the ON State current flows through M1, through M2 and D1, when the Gate of Q1 is pulsed it conducts and completes the circuit.
anishkgt:
A quick update i just tested this circuit and the braking is hard stops very fast compared to just shorting the terminal of the Motor. I've omitted the MOSFET part of the circuit as i already have a pwm controlled module to control the speed of the motor.
T3sl4co1l:
If that stops fast enough then what was this thread about in the first place?...

Tim
anishkgt:
Without the D1, the stopping from max run to a complete stop took about 10 to 20 seconds. With it takes less than 5 Seconds.
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