ELECTRONICS
60V SMPS Back-EMF Protection for Conveyor Motor
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CASE ANALYSIS
Scenario
A conveyor belt system uses a 60V SMPS to drive a brushed DC motor. When the run switch opens, inductive back EMF can damage the supply and switch, so a Schottky diode and varistor clamp the transient.
Key decisions
- Schottky diode placed anti-parallel across motor terminals to clamp negative inductive flyback
- Varistor across motor terminals to absorb high-energy transients and protect against overvoltage
- Fuse and bulk capacitor on SMPS output for overcurrent and input ripple
When to reuse this
Use for single-quadrant brushed DC motor drives powered by SMPS where back EMF protection is required, e.g. conveyors, pumps, fans.
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