Adaptive Impedance Coupling Circuit for Power Line Communication
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Solution Overview
Problem
Existing electrical inductor designs face a tradeoff between high inductance and high saturation current, resulting in costly and bulky circuits, and power-line communication systems require adaptable impedance to maintain efficient signal transmission across varying frequencies and conditions, which is challenging due to noise and power limitations.
Innovation Solution
The development of variable impedance circuits using combinations of inductors and capacitors, with compensation and adjustable components, to emulate high inductance and saturation current values, and power line communication devices with sensing and adaptive control to optimize impedance matching and signal transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive inductor is designed to have both high inductance and high saturation current, then the desired electrical performance is achieved, but the cost and physical size increase significantly
Solution Approach 1:
The patent uses an active circuit to create an electrical copy of a high-inductance inductor's impedance characteristics. The active impedance circuit emulates the inductive behavior (Z = jωL) using operational amplifiers, resistors, and capacitors, allowing the system to achieve the electrical effect of a large inductor without physically implementing it. This copying approach resolves the contradiction by providing the desired electrical performance through simulation rather than physical construction.
Solution Approach 2:
The patent replaces the passive mechanical/electromagnetic inductor structure with an active electronic circuit implementation. Instead of relying on physical coils and magnetic cores to generate inductance, the system uses active electronic components (op-amps, resistors, capacitors) to synthesize the inductive impedance. This substitution eliminates the need for bulky magnetic components while maintaining the desired electrical characteristics.
2Adaptability or versatility
If the inductor core is designed for high saturation current, then the inductor can handle high currents, but the inductance value decreases
Solution Approach 1:
The patent implements a dynamic impedance circuit where the effective inductance can be adjusted through feedback control. The active circuit monitors the current and voltage conditions and dynamically adjusts the impedance to maintain optimal inductive behavior across varying current levels. This dynamic adjustment allows the system to achieve both high current handling capability and appropriate inductance values depending on operating conditions, resolving the static trade-off between these parameters.
3Adaptability or versatility
If PLC circuits are designed to operate across a wide frequency range, then communication flexibility is improved, but the circuit becomes expensive and bulky
Solution Approach 1:
The active impedance circuit is designed to provide inductive behavior across a wide frequency range using a universal circuit topology. The operational amplifier-based design can operate effectively from DC up to several hundred kHz, eliminating the need for separate tuned circuits for different frequency bands. This multi-functional design achieves wide frequency adaptability without requiring multiple discrete components or large physical structures.
Solution Approach 2:
The patent achieves frequency adaptability by designing the active impedance circuit with parameters that can be adjusted through standard electronic component values. By changing resistor and capacitor values in the active circuit, the operational frequency range can be modified without physically redesigning the circuit structure. This parameter-based adjustment provides frequency flexibility while maintaining a compact, cost-effective design.
Data Source
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.