Adaptive PLC Coupling Circuit for Impedance Mismatch and Noise
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Solution Overview
Problem
Existing power line communication (PLC) circuits face challenges in achieving high inductance and high saturation current while being cost-effective and compact, and they struggle with efficient signal transmission due to noise and impedance mismatch issues across varying frequencies and power conditions.
Innovation Solution
The solution involves a power line communication device with a coupling circuit comprising a parallel connection of an inductor, capacitor, and resistor, along with a transceiver that adjusts impedance based on sensed parameters to enhance signal transmission efficiency and adapt to changing power conditions, using a combination of high-inductance and low-saturation inductors or adjustable capacitors to emulate a high-impedance circuit across multiple frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive inductor with high inductance and high saturation current is used, then the desired electrical properties are achieved, but the cost and physical size increase significantly
Solution Approach 1:
The patent creates an active circuit that copies the electrical impedance behavior of a high-inductance, high-saturation-current inductor using lower-inductance components. The active impedance circuit emulates the voltage-current relationship of the desired inductor through controlled current sources and feedback mechanisms, achieving equivalent electrical properties without requiring physically large passive components.
Solution Approach 2:
The patent dynamically adjusts circuit parameters (current levels, impedance values) based on operating conditions. By changing the operating point and control parameters of the active circuit, it can emulate different inductor characteristics as needed, rather than requiring a fixed large inductor to handle all possible conditions.
2Adaptability or versatility
If PLC circuits are designed for wide frequency ranges, then adaptability to different operating conditions is improved, but cost and physical size increase
Solution Approach 1:
The patent employs dynamic impedance adjustment where the active circuit continuously adapts its impedance characteristics based on the operating frequency and power conditions. Through feedback control and variable parameter adjustment, the circuit maintains optimal performance across wide frequency ranges without requiring multiple fixed-frequency components or large broadband passive structures.
3Object-affected harmful factors
If high inductance is achieved using passive components, then the desired impedance is obtained, but the circuit becomes bulky and expensive
Solution Approach 1:
The patent replaces passive electromagnetic components (large inductors and capacitors) with an active electronic control system. Instead of relying on physical electromagnetic fields generated by large components, the system uses controlled current sources, operational amplifiers, and feedback circuits to synthesize the desired impedance behavior, substituting mechanical/electromagnetic structures with electronic control mechanisms.
Data Source
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AI summary
A power line communication device including a current path provided between a first terminal and a second terminal. A coupling circuit includes a first circuit of a first inductor connected in parallel with a first capacitor and a first resistor, wherein the coupling circuit is connected between the first and second terminals. A sensor is configured to sense a communication parameter of the coupling circuit. The communication parameter may be a resonance of the first circuit, the quality (Q) factor of the resonance, the bandwidth (BW) of the coupling circuit, the resistance of the first resistor, or the impedance of the first circuit. A transceiver is adapted to couple to the first and second terminal to transmit a signal onto the current path or receive a signal from the current path responsive to the parameter of the coupling circuit and a level of current in the current path sensed by the sensor.