Pyrotechnic Switch Conductor Cutting With Symmetrical Free Strands
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Solution Overview
Problem
Existing pyrotechnic switches for cutting off electrical circuits in motor vehicles have variable operating risks due to unpredictable current cut-off conditions, which can lead to erratic operation and mechanical stresses.
Innovation Solution
A pyrotechnic switch design that cuts the electrical conductor into multiple strands with symmetrical folded wings, ensuring balanced forces and stability, using a piston-casing assembly with cutting protrusions to create free strands with either no or two folded wings, and a pyrotechnic actuator to trigger the cut, thereby ensuring predictable and reliable circuit disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrical conductor is cut at multiple points to form multiple free strands, then the arc length is extended and cutting ability is improved, but the complexity of the device increases
Solution Approach 1:
The electrical conductor is divided into multiple free strands by cutting it at multiple points (at least three separate points). This segmentation extends the arc length between conductive elements and improves cutting ability. The piston-casing assembly incorporates multiple cutting edges that simultaneously create several free strands, each with symmetrical folded wings, thereby enhancing reliability without proportionally increasing device complexity.
2Stability of the object's composition
If the free strands are made symmetrical with folded wings to balance forces, then stability and predictability are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The piston-casing assembly is designed with symmetrical cutting edges that create folded wings on either side of each free strand's base portion. This intentional symmetry in the cutting geometry ensures balanced forces during actuation, preventing erratic movement. The symmetrical design of cutting edges compensates for potential manufacturing variations by ensuring that any deviations affect both sides equally, maintaining overall balance and stability.
3Reliability
If the piston-casing assembly creates symmetrical folded wings on free strands, then unwanted movements and arcing are reduced, but the device complexity increases
Solution Approach 1:
The piston-casing assembly is pre-configured with cutting edges positioned to create symmetrical folded wings on the free strands before actuation occurs. This preliminary arrangement ensures that when the piston moves, the forces are automatically balanced, preventing unwanted movements and reducing arcing risks. The symmetrical folding action is built into the cutting geometry itself, eliminating the need for additional components to maintain balance.
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 design enhances cutting ability, reduces the risk of unwanted movements and arcing, and maintains the integrity of components by ensuring symmetrical forces during and after cutting, thereby improving safety and reliability of the switch.
Implementation Method 1
a pyrotechnic actuator designed to force the piston to cut the electrical conductor
Data Source
AI summary
A pyrotechnic switch having a casing, at least one electrical conductor passing through the casing, a piston housed in the casing, the piston-casing assembly being designed to cut the electrical conductor at least at three separate locations, so as to form at least two free conductive strands, separate from the rest of the electrical conductor, a pyrotechnic actuator designed to force the piston to cut the electrical conductor, wherein the piston-casing assembly is designed to cut the electrical conductor such that each free strand has at least one base portion with either no or two folded wings arranged on either side of the base portion, and to create at least one free strand with two folded wings.