Coupled Inductor Isolation for Single-Pair Power and Data Links
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Solution Overview
Problem
Conventional digital communication systems require dedicated electrical wires for power transmission, which are expensive and difficult to install, especially in long-distance applications, and use large inductors that are costly and inefficient for DC or low-frequency AC power.
Innovation Solution
A digital communication system using a single pair of electrical wires for both data and power transmission, employing small coupled inductors with driver circuitry to increase effective inductance and isolate communication signals from power circuitry, allowing for high-performance, cost-effective, and bidirectional power transfer with protection features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated electrical wires are used for power transmission, then power transmission reliability is improved, but cable diameter increases and installation difficulty worsens
Solution Approach 1:
The patent combines power transmission and data communication functions into a single pair of wires. The communication circuitry uses the same wire pair that carries power, eliminating the need for separate dedicated power wires. This merging reduces cable diameter and simplifies installation while maintaining reliable power transmission through the shared medium.
Solution Approach 2:
The wire pair is designed to serve multiple functions: it simultaneously transmits both power and communication signals. This multi-functionality allows the same physical medium to fulfill both power delivery and data communication roles, reducing the total number of wires needed and simplifying the overall system architecture.
2Reliability
If inductors are used to isolate power circuitry from communication circuitry, then signal isolation is improved, but device size and cost increase
Solution Approach 1:
The patent changes the operating parameters by using high-frequency communication signals superimposed on the power transmission. This frequency separation allows the use of smaller inductors that can effectively block the high-frequency communication signals while passing the lower-frequency power transmission, thereby reducing device size and cost while maintaining adequate signal isolation.
Solution Approach 2:
The inductor serves as an intermediary element that selectively interacts with different frequency components. It mediates between the power circuitry and communication circuitry by allowing power frequencies to pass while blocking communication frequencies, enabling effective isolation with smaller, more cost-effective components.
3Ease of operation
If a single pair of wires is used for both data and power transmission, then cable installation ease is improved, but signal isolation from power circuitry becomes more difficult
Solution Approach 1:
The communication system uses periodic high-frequency signaling superimposed on the power transmission. This periodic action at specific frequencies allows the inductors to effectively distinguish and isolate the communication signals from the power circuitry, maintaining signal isolation reliability while using a single wire pair for both functions.
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
Enables efficient transmission of both data and power over a single pair of wires with smaller, cheaper magnetic devices, supporting higher power levels and better signal integrity while providing protection against faults and inrush currents.
Implementation Method 1
isolators comprising coupled inductors. The coupled inductors may be used to isolate electrical power circuitry from digital communication circuitry
Implementation Method 2
driver circuitry configured to drive a third winding of each coupled inductor to increase respective inductance values of the first and second windings of each coupled inductor
Data Source
AI summary
A digital communication station includes a coupled inductor, driver circuitry, and a digital transceiver. The coupled inductor includes (1) a first winding connected between a first digital communication node and a first power node, (2) a second winding connected between a second digital communication node and a second power node, and (3) a third winding. The driver circuitry is configured to drive the third winding to increase respective inductance values of the first and second windings, and the digital transceiver is communicatively coupled to the first digital communication node and the second digital communication node.