Active Inductance Boost Transformers for Ethernet Power Data Separation

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Solution Overview

Problem

Magnetic transformers used in power distribution over Ethernet networks are cumbersome, costly, and prone to failures, limiting current transmission and causing electromagnetic interference, while also degrading communication channel performance.

Innovation Solution

The use of active inductance boost transformers and autotransformers with integrated electronic loads and non-magnetic choke circuits to separate power and data signals, reducing transformer size and eliminating the need for magnetic components, which increases impedance and provides over-voltage protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If magnetic transformers are used for power distribution over Ethernet networks, then power and data signals can be separated, but transformer size increases and electromagnetic interference occurs

Engineering Contradiction:

Improvesignal separation performanceVSAvoidtransformer size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent replaces magnetic transformers with active inductance boost circuits that use electronic components (inductors, capacitors, transistors) instead of magnetic core structures. This substitution eliminates the need for bulky magnetic components while achieving the same signal separation function through electronic impedance transformation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating parameters by using high-frequency switching to achieve impedance transformation. The active inductance boost circuit dynamically adjusts impedance through switching operations, replacing the static magnetic transformation with dynamic electronic control, thereby reducing component size.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If magnetic transformers are used in network devices, then power isolation is provided, but cost and board space increase

Engineering Contradiction:

Improvepower isolation performanceVSAvoidboard space consumption

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent substitutes magnetic transformers with solid-state electronic circuits that provide equivalent power isolation through active impedance transformation. This replacement reduces the number of discrete components and integrates functionality into smaller electronic modules, significantly reducing PCB space requirements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If magnetic transformers are used for power distribution, then DC isolation is supplied, but electromagnetic interference performance deteriorates

Engineering Contradiction:

ImproveDC isolation performanceVSAvoidelectromagnetic interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces magnetic components that generate electromagnetic interference with electronic circuits that achieve isolation through controlled impedance transformation. The active inductance boost circuit provides DC isolation without the harmful magnetic fields, reducing EMI while maintaining isolation performance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Reliability

If magnetic transformers are used in network devices, then signal transfer is achieved, but current transmission is limited

Engineering Contradiction:

Improvesignal transfer capabilityVSAvoidcurrent transmission capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the impedance transformation mechanism from magnetic to electronic control. The active inductance boost circuit can dynamically adjust impedance ratios and handle higher current capacities by changing switching parameters, thereby increasing current transmission capacity while maintaining signal transfer integrity.

Inventive Principle:

Principle #35Parameter changes

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 reduces transformer size by 10-100 times, enhances high-frequency performance, and prevents damage from surge currents, while eliminating common sources of data signal degradation and electromagnetic interference.

Implementation Method 1

an inductance boost circuit coupled to the secondary winding and operable to increase the impedance of the primary winding

Methodology Applied

Scientific EffectElectromagnetic Induction: Electromagnetic Induction

Implementation Method 2

a transformer with a primary winding and a secondary winding. The primary winding is coupled to receive input signals from a network connector and supply data signals to a physical layer (PHY) module

Methodology Applied

Scientific EffectElectromagnetic Induction: Electromagnetic Induction

Data Source

PatentUS7560825B2Network devices for separating power and data signals

Publication Date: 2009.07.14 KINETIC TECHNOLOGIES INTERNATIONAL HOLDINGS LP

AI summary

Embodiments disclosed herein provide a network device comprises a transformer with a primary winding and a secondary winding. The primary winding is coupled to receive input signals from a network connector and supply data signals to a physical layer (PHY) module. An inductance boost circuit is coupled to the secondary winding and operable to increase the impedance of the primary winding. In other embodiments, a network device comprises an autotransformer coupled to receive input signals from a network connector and supply data signals to a physical layer (PHY) module. An electronic load coupled in parallel between the autotransformer and the PHY layer module.