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Power Line Communications AC Coupled Circuit

STEVAL-XPLM01CPL

Overview

The STEVAL-XPLM01CPL is a simple yet very useful tool for power line communication testing on AC power networks.

It includes simple two-wire connectivity to any PLC transmitter/receiver and a standard connector for an AC power cord (2-pin AC plug, 8-shape female end). The main components to achieve suitable signal coupling are:
- PLC 1:1 transformer for differential coupling and basic electrical isolation
- SM6T15CA 600 W Transil +320 V ac varistor for effective protection against ESD, EFT and surge disturbances from the power line
- High voltage AC blocking capacitor with X2 safety class
- Tuning series inductor to adjust the frequency response
The STEVAL-XPLM01CPL can be very easily interfaced with the X-NUCLEO-PLM01A1 to test PLC communication performance over an AC mains network.
The frequency response of the coupling circuit is wide enough to fit any narrow-band PLC signal under normal test conditions. However, it can be easily adjusted by changing only the tuning series inductor L1.
The STEVAL-XPLM01CPL is suitable for lab measurements using equipment like an isolated probe for an oscilloscope or a spectrum analyzer, or to inject a signal from an arbitrary function generator.

Main features

Complete AC coupling circuit suitable for use with any power line communication (PLC) solution
Can be paired with the X-NUCLEO-PLM01A1 to add full AC coupling capability
Tuned for transmission inside CENELEC B to D bands
Implements isolation and protections for safe operation
Suitable for the connection of laboratory equipment for PLC measurement and testing
RoHS compliant

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-22 23:42:41

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