CIRCUIT · SMPS BACK EMF PROTECTION
SMPS Back EMF Protection Circuit Diagrams & Examples
Protect your switch-mode power supply from voltage spikes caused by inductive loads. These SMPS back EMF protection circuit diagrams show how to safely clamp or divert back EMF from DC motors, conveyor motors, and PLC relay coils, preventing damage to sensitive electronics.
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ABOUT
About these examples.
Whether you're designing industrial controls, motor drives, or automation panels, these examples give you a practical starting point. Each circuit is fully editable — open any example to modify component values, add protection devices, or adapt the layout to your application.
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HOW TO
Make one yourself.
Select a starter template
Open an SMPS back EMF protection example that matches your load type, such as a DC motor or relay coil.
Add protection components
Place a flyback diode, TVS diode, or RC snubber across the inductive load to clamp back EMF spikes.
Wire the SMPS and load
Connect the switch-mode power supply output to the protected load, ensuring the protection device is in parallel with the coil.
Label and export
Add voltage ratings, part numbers, and notes, then export the circuit diagram as an image or PDF.
FAQ
Frequently asked questions
What is the best way to protect an SMPS from back EMF?
The best protection depends on the load. A flyback diode works for DC inductive loads, while a TVS diode or RC snubber is often better for higher-voltage or faster-switching circuits.
Can I use a diode for back EMF protection in an SMPS circuit?
Yes, for DC loads like relays and DC motors, a diode across the coil is a simple and effective clamp. For AC or high-frequency switching, consider a TVS diode or RC snubber instead.
Where should the back EMF protection circuit be placed?
Place the protection device as close as possible to the inductive load, directly across its terminals, to minimize the loop area and reduce radiated noise.
Do I need back EMF protection for PLC relay coils?
Yes, relay coils produce a high-voltage spike when de-energized, which can damage PLC outputs or nearby SMPS circuitry. A diode or TVS diode is usually required.
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