DC Circuit Interrupting Switch Assembly with Pyroswitch Branch
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Solution Overview
Problem
Existing direct current electric circuit interrupting switch assemblies face challenges in withstanding long-term repeating induction-related influences and dynamic current loadings, failing to promptly interrupt circuits without forming electric arcs and ensuring complete insulation from voltage sources, especially in vehicle crash scenarios where current overloads can lead to unpredictable fuse reactions and potential short circuits.
Innovation Solution
The switch assembly features a mechanically interruptible pyroswitch with an interrupting member that displaces from its initial position to establish contact with the secondary conductor, allowing for prompt interruption of the electric circuit without arcing, and incorporates an electric fuse and pyroswitch in separate branches to manage temperature and inductivity variations, ensuring insulation of electric loads from voltage sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pyroswitch with a melting member is used to interrupt the electric circuit, then the circuit can be interrupted quickly, but the melting member cannot withstand long-term dynamic current loadings and induction-related influences
Solution Approach 1:
The primary conductor is divided into two separate branches: the first branch contains the fuse with the melting member for quick circuit interruption, while the second branch contains the interrupting member that remains intact under dynamic current loadings. This segmentation allows each branch to fulfill its specific function without compromising the other.
2Volume of moving object
If the switch assembly is made compact and simple, then it is suitable for vehicle applications, but it may fail to ensure complete insulation from voltage sources under high current conditions
Solution Approach 1:
The isolating member acts as an intermediary element that bridges the secondary conductor and the interrupting member. When the interrupting member moves to the second position, the isolating member ensures complete electrical insulation between the secondary conductor (connected to the load) and the primary conductor (connected to the voltage source), preventing any residual current flow or arcing.
3Speed
If a normally closed pyroswitch is used for quick interruption, then circuit breakage is rapid, but the switch becomes bulky and complex
Solution Approach 1:
The pyroswitch is designed as a dynamic device that transitions from a normally open state to a closed state only when actuation is required. The interrupting member can move between a first position (open circuit) and a second position (closed circuit), allowing the switch to remain compact and simple in its default state while providing rapid circuit closure when needed.
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 enables a simple, non-bulky switch assembly that effectively interrupts direct voltage electric circuits regardless of current values, preventing electric arcs and ensuring complete insulation of loads from voltage sources, even in high current overload situations, thereby enhancing safety and reliability in vehicle applications.
Implementation Method 1
capable to ensure appropriate movement of said interrupting member (51) due to interruption of said second branch (112) of the primary electric conductor (11) by means of explosion of at least one chemical reactant contained therein
Implementation Method 2
by which the electric current due to relatively high resistance of the melting member within the electric fuse the electric current is merely conducted through those branch
Data Source
Figure 1
AI summary
Directly current electric circuit interrupting switch assembly (1) is by establishing of electric connection via a primary electric conductor (11) and a secondary electric conductor (12) integrated between a direct voltage electric source (2) and at least one load (3). Said primary electric conductor (11) of the switch assembly (1) comprises of two branches (111, 112), which are in parallel connected with each other, of which the first branch (111) includes an electric fuse (4) with a melting member (41) and the second branch (12) includes a pyroswitch (5) with an interrupting member (51), which is capable to interrupt said second branch (112) of the primary electric conductor (11) extending through said pyroswitch (5), as well as an actuator (52), which is capable to ensure appropriate movement of said interrupting member (51) due to interruption of said second branch (112) of the primary electric conductor (11). Said pyroswitch (5) comprises such interrupting member (51), which is within said pyroswitch (5) displaceable from its first i.e. origin position, in which by means of it said second branch (112) of the primary electric conductor (11) is uninterrupted and in which said interrupting member (51) is held at a sufficient distance apart from the secondary electric conductor (12), into its second i.e. shifted position, in which the electric circuit throughout the second branch (112) of the primary electric conductor (11) is interrupted and the interrupting member (51) is held in an electric conductive contact with the secondary conductor (12) of the switch assembly (1).