PLC Transmitter Path Shared Transformer Impedance Management
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Solution Overview
Problem
Existing power line communication (PLC) coupling circuits are inefficient in terms of physical space usage and impedance management, as they require multiple transformers which occupy significant space and fail to maintain optimal impedance during transmission and reception modes.
Innovation Solution
The proposed PLC coupling circuit design includes a single transformer for all phases in the transmit path and dynamically adjustable band-pass filters, along with high-voltage switches to control impedance in both transmission and reception modes, reducing physical space requirements and optimizing impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transformers are used in each phase for PLC coupling circuits, then impedance matching and signal transformation are achieved, but the physical space occupied on the printed circuit board increases significantly
Solution Approach 1:
The patent combines multiple transformers into a single integrated transformer structure that handles all three phases simultaneously. Instead of using separate transformers for each phase (which would require significant board space), a single transformer with multiple windings is employed to perform the same impedance matching and signal transformation functions for all phases, thereby reducing the overall physical footprint while maintaining the necessary electrical performance
Solution Approach 2:
The single transformer design performs multiple functions that would traditionally require separate components. It provides impedance matching, signal transformation, and isolation for all three phases simultaneously, making it a multi-functional component that replaces what would otherwise require multiple dedicated transformers, thus optimizing space utilization on the circuit board
2Device complexity
If fixed impedance circuits are used in PLC devices, then simple circuit design is achieved, but optimal impedance cannot be maintained during both transmission and reception modes
Solution Approach 1:
The patent implements dynamic impedance switching capability in the PLC coupling circuit. High-voltage switches are incorporated to reconfigure the circuit topology between transmission and reception modes, allowing the impedance to be optimized for each specific mode of operation. During transmission mode, the circuit is configured for optimal transmit impedance, while during reception mode, the impedance is reconfigured for optimal receive performance, thereby maintaining reliability across different operational states
Solution Approach 2:
The circuit design allows impedance parameters to be changed dynamically based on the operational mode. By using controllable switches, the circuit can transition between different impedance states - one optimized for transmission and another optimized for reception. This parameter switching capability ensures that the PLC device maintains optimal electrical characteristics regardless of whether it is transmitting or receiving signals
3Reliability
If high-voltage switches are added to control impedance dynamically, then impedance management during transmission and reception is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic control elements (high-voltage switches) that enable the circuit to adapt its impedance characteristics based on the operational mode. These switches are controlled by a mode indicator signal that automatically configures the circuit for either transmission or reception, providing intelligent, adaptive impedance management without requiring complex manual intervention or multiple dedicated circuits for each mode
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces the footprint on printed circuit boards, saves space, and effectively manages impedance during both transmission and reception, enhancing the efficiency of PLC devices.
Implementation Method 1
the first amplifier may be configured to operate in a low impedance mode during a transmission operation and in a high impedance mode during a receiving operation
Implementation Method 2
a first capacitor coupled to the first amplifier, a first transformer coupled to the first capacitor
Implementation Method 3
a first transformer coupled to the first capacitor
Implementation Method 4
the filter network may include a second transformer
Implementation Method 5
a plurality of capacitors, a filter network coupled to the plurality of capacitors
Implementation Method 6
The plurality of high-voltage switches may be configured such that, in response to an indication that the circuit is operating in a particular transmitting mode, at least one of the plurality of high-voltage switches is open
Data Source
AI summary
A transmitter path of a power line communication (PLC) device is described. In an embodiment, the transmitter path may include an amplifier, a capacitor coupled to the amplifier, a shared transformer coupled to the capacitor, and a plurality of line interface coupling circuits coupled to the shared transformer, where each of the line interface coupling circuits is configured to be connected to a different phase of an electrical power circuit.