Switch Circuit Surge Protection via Gate Connection
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Solution Overview
Problem
Switch devices used in computer interface ports face challenges in withstanding high voltage surges without external transient voltage suppression (TVS) diodes, as they are undesirable in applications where component minimization is crucial.
Innovation Solution
The implementation of series-connected switch circuits with main switches, such as transistors, that automatically change their connection to protect against positive or negative voltage surges by connecting their gate to either their source or drain, eliminating the need for a TVS diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a TVS diode is used to protect switch circuits from high voltage surges, then surge protection is improved, but device complexity and component count increase
Solution Approach 1:
The patent combines the surge protection function with the existing main switch by adding a secondary switch that shares the same physical structure and control circuitry. Instead of adding a separate TVS diode component, the secondary switch is integrated into the same switch device, merging protection functionality with the switching functionality. This reduces component count while maintaining surge protection capability.
Solution Approach 2:
The secondary switch is designed to serve multiple functions: it acts as a normal switching element when needed, and simultaneously provides surge protection by diverting high voltage transients. This multi-functionality eliminates the need for dedicated protection components like TVS diodes, reducing overall device complexity while improving reliability.
2Reliability
If switch circuits are designed to withstand high voltage surges, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the switch circuit into multiple independent switching units (main switch and secondary switch) that can be manufactured separately and then combined. Each switch unit is designed to handle specific voltage ranges, with the secondary switch specifically engineered for surge protection. This segmentation allows each unit to be optimized for its specific function, simplifying the manufacturing process while achieving overall surge withstanding capability.
Solution Approach 2:
The patent utilizes parameter changes in the switching elements to achieve surge protection. By adjusting the threshold voltages, channel widths, and other electrical parameters of the secondary switch, it can be designed to activate automatically during surge conditions. This parameter-based design allows standard manufacturing processes to produce surge-resistant switches without requiring complex specialized fabrication techniques.
3Reliability
If multiple switch circuits are connected in series to form a switch path, then voltage surge distribution is improved, but device complexity increases
Solution Approach 1:
The patent employs dynamic switching control where the secondary switch automatically changes its state based on the voltage conditions. During normal operation, the secondary switch remains off and does not affect the signal path. During surge conditions, it automatically activates to distribute and limit the voltage across the switch path. This dynamic behavior simplifies the overall configuration compared to having multiple always-active protection components.
Solution Approach 2:
The secondary switch is designed with automatic activation capability that detects surge conditions and activates itself without external control signals. The switch monitors the voltage across its terminals and automatically turns on when surge conditions are detected, providing self-service protection. This eliminates the need for complex control circuitry or external sensing components, reducing device complexity while achieving effective voltage surge distribution.
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 configuration allows switch devices to withstand high voltage surges, such as +/â22V, with minimal current flow and voltage drop across each switch circuit, ensuring reliable surge protection without external components.
Implementation Method 1
a main switch, such as a transistor that can be configured to withstand a positive or negative voltage surge by automatically changing the connection of its gate
Data Source
AI summary
A switch device includes a common node that is connected to end nodes, such as that of computer interface ports. The switch device includes several switch circuits that can be connected in series to form a switch path between the common node and an end node. A switch circuit can include a main switch, such as a transistor that can be configured to withstand a positive or negative voltage surge by automatically changing the connection of its gate.