Inrush Current Limiting Switch with Series Resistor
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Solution Overview
Problem
Information handling systems face issues with inrush current over-stressing internal components when switching on power, particularly due to high capacitive loads, which existing solutions like custom integrated circuits fail to address effectively, as they are costly and occupy board space.
Innovation Solution
An inrush current limiting switch is designed with a resistor connected in series between terminals, enabling a soft start and limiting current draw during power-on transitions, utilizing a multi-stage mating sequence and a mechanical assertion mechanism to ensure stable power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If custom integrated circuits are used to limit inrush current, then inrush current is reduced, but cost and board space increase
Solution Approach 1:
The patent combines the inrush current limiting function with the power switch itself by integrating a resistor in series with the switch contacts. This merging of functions eliminates the need for separate current-limiting components, thereby reducing board space while maintaining inrush current protection.
Solution Approach 2:
The switch is designed to perform multiple functions: it serves as both the power switching mechanism and the inrush current limiter through the integrated series resistor. This multi-functionality allows a single component to address both power control and current protection needs, reducing overall system complexity and board space requirements.
2Object-affected harmful factors
If custom integrated circuits are used to limit inrush current, then inrush current is reduced, but cost increases
Solution Approach 1:
The patent replaces expensive custom integrated circuits with a simple resistor, which is a low-cost, readily available component. This substitution dramatically reduces material costs while achieving the same inrush current limiting effect, making the solution economically viable for mass production.
Solution Approach 2:
Instead of using complex custom ICs, the patent employs a standard resistor component that can be easily sourced and manufactured. This approach copies the essential current-limiting function using a simple, well-understood component rather than requiring expensive proprietary technology.
3Object-affected harmful factors
If a resistor is added in series to limit inrush current, then inrush current is reduced, but device complexity increases
Solution Approach 1:
The resistor is integrated directly into the switch assembly, merging the current-limiting function with the switching mechanism. This consolidation means the resistor is not an separate added component but part of the switch structure itself, thereby minimizing increases in overall device complexity.
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 reduces inrush current, preventing component over-stressing and circuit disturbances, while being cost-effective and space-efficient by eliminating the need for expensive custom integrated circuits.
Implementation Method 1
A resistor is connected in series between a first terminal and a second terminal, and limits inrush current that flows when the switch is moved from the OFF position to the ON position
Data Source
AI summary
A switch includes an actuator for moving the switch from an OFF position to an ON position. A resistor is connected in series between a first terminal and a second terminal, and limits inrush current that flows when the switch is moved from the OFF position to the ON position.