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ELECTRONICS

60V SMPS Back-EMF Protection for DC Motor Regenerative Braking

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UPDATED 2026-09-22
TYPECircuit
USE-CASESmps Back Emf Protection
EXAMPLE60V SMPS Back-EMF Protection for DC Motor Regenerative Braking
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CASE ANALYSIS

Scenario

A 60V switch-mode power supply drives a DC motor. During regenerative braking, the motor can generate back EMF that exceeds the supply rail, risking damage to the SMPS and downstream electronics.

Key decisions

  • Add a flyback diode across the motor to clamp inductive kickback
  • Place a TVS diode across V+ and V- to absorb regenerative overvoltage
  • Include a fuse and run switch for overcurrent protection and manual control

When to reuse this

Use when protecting an SMPS-powered DC motor drive from back EMF and voltage transients during braking or freewheeling.

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