Integrated Planar Switch for Multi-Mode Detonator
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Solution Overview
Problem
Conventional detonators with exploding foil initiators are limited to single-mode operation, making them larger and heavier when attempting to incorporate multi-mode functionality, which complicates non-destructive verification and storage requirements in compact, expensive devices.
Innovation Solution
A detonator design with an integrated planar switch that allows operation in standard, breakdown, and trigger modes by strategically positioning source and return pads to facilitate electrical energy transfer through varying gap distances and biasing voltages, reducing the need for additional leads and increasing compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-mode functionality is incorporated into a detonator, then operational versatility is improved, but device size and weight increase
Solution Approach 1:
The patent combines multiple operational modes (standard, breakdown, and trigger modes) into a single detonator design using a unified planar switch structure. The source pad and return pad are integrated onto the same planar surface, allowing the detonator to perform multiple functions without requiring separate components for each mode, thereby achieving multi-mode operation without proportionally increasing device weight
Solution Approach 2:
The planar switch with source and return pads is designed to support multiple operational modes through a single configuration. By strategically positioning the pads and gaps, the same physical structure enables standard mode (direct electrical connection), breakdown mode (electrical energy jumping the gap), and trigger mode (biasing voltage application), making the detonator universally applicable across different operational requirements without adding weight
2Reliability
If additional leads are added for non-destructive testing, then verification capability is improved, but device complexity increases
Solution Approach 1:
The element pads and planar switch pads serve dual purposes: they are essential for the detonator's operational functionality (providing electrical connections for initiation) and simultaneously serve as test points for non-destructive verification. This eliminates the need for separate dedicated test leads, as the same pads used for operation can be used for integrity testing, thereby improving verification capability without increasing device complexity
Solution Approach 2:
The detonator structure provides its own test points through the element pads and planar switch pads that are already part of the operational circuitry. These pads enable self-verification capabilities, allowing the device to be tested for integrity (such as electrical continuity of the bridge) without requiring external additional leads or complex testing infrastructure
3Volume of moving object
If pad spacing is reduced for compactness, then device size is improved, but electrical energy transfer reliability deteriorates
Solution Approach 1:
The patent employs different gap distances between pads based on their specific functional requirements. The first gap (source pad to first element pad) and second gap (return pad to second element pad) are strategically dimensioned to ensure reliable electrical energy transfer for each operational mode. This localized optimization of gap spacing ensures that each pad pair has the appropriate distance for its specific function, maintaining reliability while achieving overall compactness
Data Source
AI summary
A device having an initiator and an integrated planar switch. The initiator has a base, an initiating element that is coupled to the base, a first element pad, which is electrically coupled to a first side of the initiating element, and a second element pad, which is electrically coupled to a second side of the initiating element opposite the first element pad. The integrated planar switch has a source pad and a return pad. The source pad is coupled to the base and is spaced apart from the first element pad by a first gap distance to define a first gap therebetween. The return pad is coupled to the base and is spaced apart from the second element pad by a second gap distance to define a second gap therebetween.