Variable Impedance Coupling Circuit for Adaptive PLC Matching
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Solution Overview
Problem
Existing electrical inductor designs face a tradeoff between achieving high inductance and high saturation current, often resulting in expensive and bulky circuits, and power-line communication systems require efficient operation across a wide range of frequencies, which can be costly and inefficient due to noise and impedance mismatch issues.
Innovation Solution
The development of active impedance circuits and adjustable capacitor/inductor combinations that emulate a high inductance and high saturation current, allowing for efficient power delivery and communication by dynamically adjusting impedance to match changing system conditions, using sensors and transceivers to monitor and control power parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive inductor with high inductance and high saturation current is used, then the circuit achieves high inductance and high saturation current, but the circuit becomes expensive and physically large and bulky
Solution Approach 1:
The patent uses active circuitry to create an equivalent inductor that copies the electrical behavior of a high-inductance, high-saturation-current passive inductor. The active inductor circuit emulates the impedance characteristics without requiring the physical magnetic core and windings of a traditional inductor, thereby achieving the same electrical function in a compact form factor
Solution Approach 2:
The patent replaces the mechanical/passive magnetic inductor structure with an active electronic circuit implementation. Instead of relying on physical magnetic fields and core materials, the invention uses operational amplifiers, resistors, and capacitors to synthesize the inductive impedance, substituting a mechanical/magnetic system with an electronic control system
2Adaptability or versatility
If PLC circuits are designed to operate at a wide range of frequencies, then communication effectiveness is improved, but the circuits become expensive and bulky
Solution Approach 1:
The patent implements dynamically adjustable impedance circuits that can adapt their characteristics in real-time. The active inductor circuits can modify their equivalent inductance and saturation current values through control signals, allowing the PLC circuit to optimize its impedance matching across different frequency ranges without requiring multiple fixed-frequency components
Solution Approach 2:
The patent creates a universal active inductor circuit that can function across multiple frequency ranges by adjusting control parameters. The same basic circuit topology can be configured to provide appropriate impedance characteristics for different PLC operating frequencies, eliminating the need for separate circuits for each frequency band
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 connected between the first and second terminals includes a first circuit of a first inductor connected in parallel with a first capacitor and a first resistor. 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.