INDUSTRIAL ELECTRONICS
SMPS Back-EMF Protection Circuit for PLC Relay Coil
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CASE ANALYSIS
Scenario
An industrial PLC output module drives a relay coil from a 60V SMPS. The design shows a flyback diode and RC snubber across the coil to clamp turn-off transients before they damage the switching MOSFET.
Key decisions
- Flyback diode D1 placed anti-parallel across relay coil
- Series RC snubber (R1 + C1) across coil to damp ringing
- Low-side N-MOSFET M1 switches coil to V− rail
- V+ / V− rails labeled from 60V SMPS
When to reuse this
Use when designing or documenting DC relay coil suppression in PLC outputs, industrial controls, or any low-side switched inductive load.
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circuit-60v-smps-back-emf-protection-circuit-diagram-for-a-relay-coi