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A Notch Filter-Based Coupling Circuit for UNB and NB PLC Systems.

Luís Guilherme da Silva Costa¹, Wesley Mateus Cantarino¹, Ândrei Camponogara²

¹Department of Electrical Engineering, Federal University of Juiz de Fora, Juiz de Fora 36036-900, Brazil.

Sensors (Basel, Switzerland)

|December 23, 2022

Summary

This study presents a novel analog notch filtering circuit for power line communication systems. It effectively filters out main power frequencies, improving data transmission and sensing capabilities.

Keywords:

coupling circuit narrowband notch filter power line communication ultra-narrowband

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Area of Science:

Electrical Engineering
Signal Processing
Telecommunications

Background:

Power line communication (PLC) systems face challenges with noise and interference from the power grid.
Ultra-narrowband and narrowband PLC systems require efficient filtering for reliable data transmission.
Existing coupling circuits may not adequately suppress low-frequency noise inherent in power grids.

Purpose of the Study:

To introduce an analog notch filtering-based coupling circuit for PLC receivers.
To enhance signal quality in ultra-narrowband and narrowband PLC systems operating on low-voltage grids.
To provide a more effective coupling solution compared to traditional methods for specific frequency ranges.

Main Methods:

Design of a twin-T notch analog filter to attenuate main power frequencies (50/60 Hz).
Integration of an elliptic low-pass analog filter with a cutoff frequency significantly higher than the main frequency.
Cascading the notch and low-pass filters to form the complete coupling circuit.

Main Results:

The prototype circuit achieved 22 dB attenuation at the main frequency (e.g., 60 Hz).
Attenuation was less than 2 dB across the rest of the frequency bandwidth (e.g., up to 2 MHz).
The proposed circuit demonstrated superior performance over capacitive coupling for frequencies below 3 kHz.

Conclusions:

The analog notch filtering-based coupling circuit is highly effective for ultra-narrowband and narrowband PLC.
This circuit significantly improves signal integrity by filtering out low-frequency power line noise.
It offers a more efficient solution for data communication and sensing applications in power line environments.