Resonant Coupling Circuit Impedance Tuning 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, often resulting in expensive 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 a power line communication device with a coupling circuit comprising a first inductor connected in parallel with a capacitor and a resistor, along with a sensor to sense communication parameters, and a transceiver to adjust impedance dynamically, allowing for efficient signal transmission and reception by compensating for saturation and noise effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive inductor is designed to achieve high inductance and high saturation current, then the desired electrical performance is obtained, but the cost and physical size increase significantly
Solution Approach 1:
The patent replaces the passive mechanical inductor with an active electronic circuit comprising operational amplifiers, resistors, and capacitors that electronically emulates inductor behavior. This substitution eliminates the need for large magnetic cores and windings, achieving equivalent electrical performance without the associated size and weight penalties of traditional passive inductors
Solution Approach 2:
The patent uses variable resistors and capacitors to dynamically adjust the emulated inductor's parameters (inductance value and saturation current characteristics). By changing the values of these passive components, the circuit can adapt to different operational requirements, providing high inductance and high saturation current characteristics as needed without requiring physically large components
2Reliability
If the inductor core is designed for high saturation current, then the current handling capability is improved, but the inductance value decreases
Solution Approach 1:
The patent employs dynamic control through operational amplifiers that actively regulate the circuit behavior based on input signals. The active circuit can dynamically adjust its characteristics to provide high saturation current capability while maintaining high inductance values through electronic feedback mechanisms, something impossible with static passive inductor designs
Solution Approach 2:
The patent uses variable resistors and capacitors under active control to dynamically change the emulated inductor parameters. This allows the system to simultaneously achieve high saturation current and high inductance by electronically adjusting the circuit parameters rather than being constrained by fixed physical properties of magnetic materials
3Adaptability or versatility
If PLC circuits are designed to operate across wide frequency ranges, then communication versatility is improved, but cost and physical size increase
Solution Approach 1:
The patent uses active operational amplifier circuits with variable capacitors and resistors that can be dynamically adjusted to change the resonant frequency and impedance characteristics. This dynamic adjustability allows a single compact circuit to operate across wide frequency ranges for PLC applications without requiring multiple fixed-frequency circuits or large tuning components
Solution Approach 2:
The patent designs a universal PLC circuit that can operate across multiple frequencies and communication standards using a single active circuit topology. The operational amplifier-based emulated inductor provides multi-functional capability, serving different PLC frequency requirements (such as 30-500 kHz ranges) without requiring separate dedicated circuits for each frequency band, thereby reducing overall system size and cost
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 solution enables efficient power delivery and communication by providing a dynamic impedance adjustment that maintains signal integrity across a wide range of frequencies and conditions, reducing absorption and attenuation, and operates effectively with both primary and auxiliary power sources.
Implementation Method 1
the inductor to store energy during a first time interval and release energy during a second time interval
Implementation Method 2
a first capacitor in parallel with the inductor
Implementation Method 3
a first resistor in parallel with the inductor
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.