Portable Device Electric Shock Protection Circuit

Solution Overview

Problem

Portable electronic devices with exposed metal cases are vulnerable to leakage currents and static electricity, leading to user safety risks and reduced RF reception sensitivity due to inadequate protection mechanisms.

Innovation Solution

Incorporating an electric shock protection element connected in series to a conductive part on the circuit board, which includes a conductive cover and connecting part, to block leakage currents and static electricity while allowing for adjustable capacitance to enhance RF reception sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a protective element with high capacitance is used to improve RF reception sensitivity, then RF reception sensitivity is improved, but the protective element becomes vulnerable to electrostatic discharge

Engineering Contradiction:

ImproveRF reception sensitivityVSAvoidvulnerability to electrostatic discharge

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The protective element is divided into two functional segments: a first protective element (capacitor) with high capacitance for RF reception sensitivity, and a second protective element (varistor or suppressor) with high breakdown voltage for electrostatic discharge protection. Each segment handles a specific protection function, allowing the system to achieve both high RF sensitivity and ESD robustness without compromise.

Inventive Principle:

Principle #1Segmentation

2Reliability

If a low capacitance protective element is used to protect against electrostatic discharge, then ESD protection is improved, but RF reception sensitivity deteriorates

Engineering Contradiction:

ImproveESD protectionVSAvoidRF reception sensitivity

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The protective element is divided into two functional segments: a first protective element (capacitor) with high capacitance for RF reception sensitivity, and a second protective element (varistor or suppressor) with high breakdown voltage for electrostatic discharge protection. Each segment handles a specific protection function, allowing the system to achieve both high RF sensitivity and ESD robustness without compromise.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If a single protective element is used to provide both ESD protection and RF signal transmission, then device complexity is reduced, but the protective performance for both functions cannot be optimized simultaneously

Engineering Contradiction:

Improvenumber of protective elementsVSAvoidprotective performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The protective element is divided into two functional segments: a first protective element (capacitor) with high capacitance for RF reception sensitivity, and a second protective element (varistor or suppressor) with high breakdown voltage for electrostatic discharge protection. Each segment handles a specific protection function, allowing the system to achieve both high RF sensitivity and ESD robustness without compromise.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The series combination of the two protective elements creates a multi-functional protection system that simultaneously provides ESD protection, leakage current blocking, and RF signal transmission capabilities. The first protective element handles RF signals and capacitive coupling, while the second handles voltage surge protection, together achieving universal protection functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 solution effectively protects both the internal circuit and user from electrical shocks and static electricity while improving RF reception sensitivity by allowing the electric shock protection element to function with high capacitance as needed, thus addressing the vulnerabilities of existing devices.

Implementation Method 1

the electric shock protection element to have a breakdown voltage Vbr, which satisfies the following expression: Vbr>Vin

Methodology Applied

Scientific EffectBreakdown voltage: Avalanche Breakdown

Implementation Method 2

configured to pass static electricity introduced from the conductive cover and block a leakage current of an external power source

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Data Source

PatentUS10631448B2Portable electronic device with embedded electric shock protection function

Publication Date: 2020.04.21 AMOTECH CO LTD

AI summary

Provided is a portable electronic device with an embedded electric shock protection function. A portable electronic device with an embedded electric shock protection function according to an exemplary embodiment of the present invention comprises: a circuit board; a camera module mounted on the circuit board; a conductive cover disposed to cover a part of an upper side of the camera module; a conductive connecting part mounted on the circuit board and configured to come into electrical contact with the conductive cover; and an electric shock protection element mounted on the circuit board to be connected in series to the conductive connecting part and configured to pass static electricity introduced from the conductive cover and block a leakage current of an external power source introduced into a ground of the circuit board.