Nothing close enough? Start from a blank circuit diagram → Describe it in one paragraph.
How to use a circuit diagram template.
- 01Select a starter template
Open an SMPS back EMF protection example that matches your load type, such as a DC motor or relay coil.
- 02Add protection components
Place a flyback diode, TVS diode, or RC snubber across the inductive load to clamp back EMF spikes.
- 03Wire 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.
- 04Label and export
Add voltage ratings, part numbers, and notes, then export the circuit diagram as an image or PDF.
Questions about circuit diagram templates
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.