High Current Inductor Circuit for PLC Isolation
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Solution Overview
Problem
Existing power line communication (PLC) systems face challenges due to high noise and low impedance in power grids, which are exacerbated by the need for large and expensive inductors to handle high currents, making it difficult to achieve effective communication while maintaining cost and size efficiency.
Innovation Solution
A circuit is introduced that enhances the inductance of high-current inductors in PLC systems by using a coupler to sense voltage across the main inductor and a current generator to replicate correlated currents, effectively amplifying the inductance value without requiring a large core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large core inductor is used to handle high current in PLC systems, then the inductance value is sufficient for effective isolation, but the size and cost of the inductor increase significantly
Solution Approach 1:
The patent uses a coupler to sense the voltage across the main inductor and a current generator to replicate correlated currents that flow back into the main inductor. This copying mechanism effectively amplifies the inductance value without requiring a physically larger core, resolving the contradiction between achieving sufficient inductance for isolation and reducing inductor size.
Solution Approach 2:
The patent changes the electrical parameters by introducing active current generation that replicates and feeds back correlated currents. This parameter change transforms a passive inductor into an active system where the inductance value is dynamically enhanced through feedback current injection, allowing small core inductors to achieve large effective inductance values.
2Reliability
If a large core inductor is used to handle high current in PLC systems, then the inductance value is sufficient for effective isolation, but the manufacturing cost increases
Solution Approach 1:
The patent uses a coupler to sense the voltage across the main inductor and a current generator to replicate correlated currents that flow back into the main inductor. This copying mechanism effectively amplifies the inductance value without requiring a physically larger core, resolving the contradiction between achieving sufficient inductance for isolation and reducing inductor size.
Solution Approach 2:
The patent changes the electrical parameters by introducing active current generation that replicates and feeds back correlated currents. This parameter change transforms a passive inductor into an active system where the inductance value is dynamically enhanced through feedback current injection, allowing small core inductors to achieve large effective inductance values.
3Reliability
If the inductance value is increased to improve isolation effect, then the communication signal can be better blocked, but the inductor size and cost increase
Solution Approach 1:
The patent uses a coupler to sense the voltage across the main inductor and a current generator to replicate correlated currents that flow back into the main inductor. This copying mechanism effectively amplifies the inductance value without requiring a physically larger core, resolving the contradiction between achieving sufficient inductance for isolation and reducing inductor size.
Solution Approach 2:
The patent replaces the mechanical approach of increasing core size with an electrical feedback mechanism. Instead of physically enlarging the inductor core to increase inductance, the system uses electronic current generation and feedback to achieve the same electrical effect, thereby reducing physical complexity while maintaining or improving isolation performance.
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
The proposed solution significantly improves the communication effect by isolating noise and impedance on the power consumption side, while reducing the cost and size of the inductor components, enabling stable and mass-producible inductance enhancement up to 100 times.
Implementation Method 1
a coupler (201) is used to sense a voltage across two ends of a main inductor (LP)
Implementation Method 2
the current generator (202) couples a current of the current generator back to the main inductor (LP)
Data Source
AI summary
An isolator for separating a power line into a power consumption side and a transmission side can be used to enhance power line communication (PLC) and to prevent time varying noise and impedance of the power consumption side in a communication frequency band from affecting communication effects, wherein the isolator often has a larger inductance value. This disclosure provides a special circuit, wherein the inductor is kept at a low inductance value when a low frequency alternating current flows through the inductor, but is kept at a high inductance value in the communication frequency band, and a small core can be used to satisfy requirements of the high inductance value in the communication frequency band.