Integrated USB ESD Protection With AC Capacitor Discharge

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Solution Overview

Problem

USB 3.2 and USB 4 interfaces face challenges with increased part count, costs, and space requirements due to the separate implementation of AC coupling and ESD protection devices, which can lead to damage from ESD strikes and are not suitable for applications with limited installation space.

Innovation Solution

An ESD protection device is integrated into a single electronic component that includes an ESD protection component and a discharge resistor, configured to limit voltage and discharge AC coupling capacitors, respectively, allowing for a more compact and cost-effective solution that can be incorporated into USB interfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If AC coupling and ESD protection are implemented as separate devices, then ESD protection functionality is provided, but the part count, costs, and space requirements increase

Engineering Contradiction:

ImproveESD protectionVSAvoidpart count

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the AC coupling capacitor and discharge resistor into a single integrated electronic component. The capacitor provides AC coupling functionality while the integrated discharge resistor provides ESD protection, eliminating the need for separate discrete components and reducing overall device complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated electronic component performs multiple functions simultaneously: AC coupling through the capacitor and ESD protection through the discharge resistor. This multi-functional design reduces the total number of components needed in the USB interface circuit

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If AC coupling and ESD protection are implemented as separate devices, then ESD protection functionality is provided, but production costs increase

Engineering Contradiction:

ImproveESD protectionVSAvoidproduction costs

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

By integrating the capacitor and discharge resistor into a single component, the patent reduces the number of separate parts that need to be manufactured, stocked, and assembled. This consolidation lowers production costs through reduced component count and simplified supply chain management

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The multi-functional integrated component replaces multiple single-function components, reducing bill of materials costs and manufacturing complexity. The single component serves both AC coupling and ESD protection purposes, eliminating redundant manufacturing steps

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If AC coupling and ESD protection are implemented as separate devices, then ESD protection functionality is provided, but space requirements increase

Engineering Contradiction:

ImproveESD protectionVSAvoidinstallation space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The integration of the capacitor and discharge resistor into a single electronic component physically consolidates the space required for both functions. Instead of accommodating two separate components with their respective mounting areas, the design now requires space for only one component, significantly reducing the footprint in space-constrained applications

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 integration reduces the number of components, lowers production costs, and provides effective ESD protection while maintaining AC coupling functionality, thereby protecting USB interfaces from over-voltages and ESD strikes without increasing space requirements.

Implementation Method 1

USB 3.2 or USB 4 interfaces can be extremely sensitive to ESD strikes. ESD strikes, for example, cause damage to components such as hubs, routers, or controllers of the USB interface.

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Implementation Method 2

an ESD protection component configured to limit a voltage applied to the USB interface

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 3

at least one discharge resistor configured to discharge an AC coupling capacitor of the USB interface

Methodology Applied

Scientific EffectElectrical resistance: Electrical Resistance

Data Source

PatentEP3933603B1An electrostatic discharge, ESD, protection device for a universal serial bus, USB, interface

Publication Date: 2024.08.28 INFINEON TECHNOLOGIES AG

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AI summary

The present disclosure relates to an ESD protection device (240) for a USB interface (210). The ESD protection device (240) comprises an ESD protection component (246) configured to limit a voltage applied to the USB interface (210) and at least one discharge resistor (244, 244.1, 244.2) configured to discharge an AC coupling capacitor (242) of the USB interface (210). The ESD protection component (246) and the discharge resistor (244, 244.1, 244.2) are incorporated in a single electronic component (245).