Cable Common-Mode Choke Coil Noise Suppression

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Solution Overview

Problem

USB cables often suffer from noise interference from power supply units, such as battery chargers and personal computers, which can affect the performance of connected devices like smartphones and tablets.

Innovation Solution

The cable incorporates a common-mode choke coil connected to the ground and power cables at both ends, effectively suppressing noise by allowing signal currents to flow in differential mode while blocking noise currents in common mode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a common-mode choke coil is connected to the ground cable and power cable, then noise suppression is improved, but device complexity increases

Engineering Contradiction:

Improvenoise interferenceVSAvoidcable structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

A common-mode choke coil is introduced as an intermediary component between the power supply unit and the receiving device. This choke coil acts as a mediator that allows differential-mode signals (power and data) to pass through while blocking common-mode noise, thus suppressing noise interference without requiring changes to the power supply unit or receiving device

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The cable employs a composite structure combining multiple cable types (signal cables for differential transmission, ground cable, and power cable) with the common-mode choke coil integrated into the connector assembly. This composite design enables the cable to simultaneously perform signal transmission, power delivery, and noise suppression functions

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If multiple cables (signal, ground, power) are integrated in one cable assembly, then functionality is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvecable functionalityVSAvoidcable assembly precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent merges multiple separate cable functions (differential signal transmission, grounding, and power supply) into a single integrated USB cable assembly. The common-mode choke coil is integrated into the connector, combining noise suppression functionality with the electrical connection components, thereby simplifying the overall system while maintaining manufacturing feasibility

Inventive Principle:

Principle #5Merging (Combining)

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 design significantly reduces noise interference, maintaining the integrity of signal transmission and power supply, thereby preventing a decrease in reception levels in connected devices.

Implementation Method 1

at least one of the first connector and the second connector has a common-mode choke coil connected to the ground cable and the power cable

Methodology Applied

Scientific EffectCommon-mode choke coil: Electromagnetic Induction

Data Source

PatentEP3404672B1cable

Publication Date: 2022.11.30 SONY GROUP CORP

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Figure 3A~3B
Figure 4A~4B

AI summary

A cable includes a cable part including at least one set of signal cables for differential transmission, a ground cable, and a power cable, and a first connector and a second connector arranged at both ends of the cable part. At least one of the first connector and the second connector has a common-mode choke coil connected to the ground cable and the power cable.