Medium-voltage broadband PLC signal coupling system based on inverted L-shaped matching attenuator

• Main Authors: CHEN XIAOFENG, LIANG XIAOLIN, ZHAO XIONGWEN, XIE ZHIYUAN, CAO WANGBIN
• Format: Patent
• Language: Chinese; English
• Published: 07.07.2023
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

The invention provides a medium-voltage broadband PLC (Programmable Logic Controller) signal coupling system based on an inverted L-shaped matching attenuator. The coupling system comprises a coupling module, an isolation module, an inverted L-shaped impedance matching module, a band-pass filtering module and a protection element. The coupling module is a coupling capacitor and is used for signal coupling and blocking 50Hz power frequency voltage; the isolation module is an isolation transformer and is used for current isolation; the inverted L-shaped impedance matching module is used for matching the terminal carrier machine with the power line end impedance and reducing signal reflection; the band-pass filtering module is a band-pass filter and is used for signal frequency selection and filtering out-of-band interference; the protection element is a lightning arrester and is used for sensing and inhibiting instantaneous overvoltage surge on the circuit. Signal coupling can be carried out in the broadband ra