Push Switch Design to Reduce Spark Damage in High-Voltage Systems
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Summary
Problems
Existing push-button switches for vehicle interior lights experience spark-induced damage when using high-voltage batteries, as the movable contact strip is isolated from the first fixed contact strip, leading to poor contact and reduced service life.
Innovation solutions
The push-button switch design ensures the movable contact strip is isolated from both first and second fixed contact strips simultaneously, distributing the spark occurrence to two points, thereby reducing damage and increasing the service life of the contact strips.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a 24-volt battery is used in a vehicle, then wire harness weight is reduced, but sparks occur between contact strips causing damage and reduced service life
Why choose this principle:
The contact area of the second fixed contact strip is divided into a conductive area and a nonconductive area. The nonconductive area is positioned to receive the movable contact strip when isolated from the first fixed contact strip, distributing the spark occurrence to two different points and reducing damage concentration.
Principle concept:
If the movable contact strip is isolated from the first fixed contact strip, then the push-button switch is turned off, but a spark occurs causing contact portion damage
Why choose this principle:
A nonconductive member is embedded in the contact area of the second fixed contact strip to act as an intermediary. When the movable contact strip is isolated from the first fixed contact strip, it contacts the nonconductive area instead of causing a harmful spark, thus protecting the contact portions from damage.
Application Domain
Data Source
AI summary:
The push-button switch design ensures the movable contact strip is isolated from both first and second fixed contact strips simultaneously, distributing the spark occurrence to two points, thereby reducing damage and increasing the service life of the contact strips.
Abstract
A push-button switch includes a fixed member having a first fixed contact strip disposed on the inner surface of the fixed member and a second fixed contact strip disposed on the inner surface of the fixed member and opposite the first fixed contact strip; a control member biased by a spring from the fixed member and locked in a desired position; and a movable contact strip configured, when attached to the control member locked in the desired position, to be in contact with and to short-circuit the first fixed contact strip and the second fixed contact strip. The movable contact strip is configured to be isolated from the first and second fixed contact strips at substantially the same time when the control member is controlled against a biasing force of the spring.