Integrated Capacitor Varistor for ESD Protection in Metal Housings
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Solution Overview
Problem
Portable electronic devices with metal housings face challenges in resisting electrostatic discharge (ESD), maintaining temperature stability, and achieving high capacitance due to the conductivity of metal materials, which can lead to electrical paths and leakage currents, potentially causing user discomfort or injury.
Innovation Solution
An electric shock protection device is designed with a capacitor unit and a varistor unit packaged as a single component, featuring separate static electricity protection and capacitance functions, utilizing sheet layers, capacitor electrodes, soldering electrodes, and a molding portion to enhance resistance to ESD, temperature characteristics, and capacitance capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If varistor type devices are used as electric shock protection devices, then resistance to static electricity is strengthened, but capacitance capacity is insufficient and temperature characteristics are degraded
Solution Approach 1:
The patent combines a capacitor and a varistor into a single integrated electric shock protection device. The capacitor provides high capacitance for communication signals, while the varistor provides static electricity protection. Both components are packaged together in one device, allowing simultaneous achievement of high capacitance and ESD resistance without the trade-offs of using varistor-only solutions.
2Reliability
If varistor type devices are used as electric shock protection devices, then resistance to static electricity is strengthened, but temperature characteristics are degraded
Solution Approach 1:
The integrated device packages both capacitor and varistor together, where the capacitor provides stable temperature characteristics while the varistor provides ESD protection. This combination allows the device to maintain good temperature characteristics overall, overcoming the high temperature change rate issue of varistor-only devices.
3Strength
If metal housings are used in portable electronic devices, then aesthetics and robustness are improved, but electrical paths and leakage currents are generated
Solution Approach 1:
The patent extracts the harmful electrical path issue from the metal housing system by introducing a dedicated electric shock protection device that provides a controlled low-impedance path to ground. This separates the structural benefits of metal housing from the electrical hazards, allowing the housing to maintain robustness while the protection device manages leakage currents and ESD.
4Productivity
If a single component provides both static electricity protection and capacitance functions, then manufacturing efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the capacitor and varistor into a single packaged component with shared terminals, reducing the number of discrete parts and assembly steps. This integration improves manufacturing efficiency by allowing both functions to be implemented through one device while managing complexity through standardized packaging and terminal configurations.
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 strengthens resistance to static electricity, improves temperature stability, and increases capacitance capacity, enhancing product reliability and manufacturing efficiency while simplifying the design and reducing costs by allowing for various capacitance options without additional process changes.
Implementation Method 1
a capacitor unit which includes a plurality of sheet layers and a plurality of capacitor electrodes provided on the sheet layers and has an electric shock prevention function and a communication signal transmission function
Implementation Method 2
resistance to electrostatic discharge (ESD)... strengthened
Data Source
AI summary
Provided are an electric shock protection device and method of manufacturing the same. The electric shock protection device may include a capacitor unit comprising multiple sheet layers and multiple capacitor electrodes provided on the sheet layers and has an electric shock prevention function and a communication signal transmission function; a pair of soldering electrodes formed on the sheet layer disposed at an outermost side among the sheet layers, extend from both ends toward a center of the capacitor unit, and are formed as electrodes for co-firing; a pair of terminal electrodes provided at both ends of the sheet layers and connecting the capacitor electrodes to the pair of soldering electrodes; a varistor connected to the pair of soldering electrodes through solders and formed as a single component; and a molding portion molded on the varistor, the pair of soldering electrodes, and one side of each of the terminal electrodes.