The following figure shows the PLC Coupling assembled (PLCOUP014-ISO) which is composed of four
sub-circuits:
1.
Transmission Stage
2.
Filtering Stage
3.
Coupling Stage
4.
Reception Stage
Figure 3-10. PLC Coupling Schematic on PL360G55CB-EK Board
1
2
4
3
Remember:
PLC Coupling circuitry adds a yellow LED, D104, for visual indication of PLC
frames transmission.
The following sections describe the aim of every sub-circuit assembled in the PL360G55CB-EK board.
3.3.5.1
PLC Transmission Circuit
The transmission stage adapts the EMIT signals and amplifies them. In the PL360G55CB-EK board, see
, it is a single branch composed of:
• Driver: It adapts the EMIT signals to either control the amplifier or to be filtered by the next stage
• Amplifier: A Class-D amplifier generating a square waveform from 0 to 12V
• Bias and protection: It provides a DC component and provides protection from received disturbances
The transmission stage is followed by a filtering stage.
3.3.5.2
PLC Filtering Circuit
The in-band flat response filtering stage reduces spurious emission to the limits set by the corresponding
regulation and blocks potential interferences from other transmission channels without distorting the
injected signal.
The filtering stage used in PL360G55CB-EK, see
• Band-pass filtering of high frequency components of the square waveform generated by the
transmission stage
PL360G55CB-EK
PL360G55CB-EK Board
©
2019 Microchip Technology Inc.
User Guide
DS50002871A-page 22
