Addressable Ignition Circuit With PCB Heater for Robust Detonators
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Solution Overview
Problem
Existing detonators used in oilfield and mining operations are fragile, difficult to produce in large volumes, and not durable enough for harsh conditions, due to their small nichrome heating elements and complex wiring requirements.
Innovation Solution
A detonator initiator device incorporating a thyristor with a standoff voltage of >50V AC/DC, a high-power resistor for ignition, and a thermally conductive substrate mounted on an FR4 circuit board, which allows for reliable operation at high temperatures and is amenable to high-volume production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nichrome heating element is used in a detonator initiator, then the detonator can be initiated by electric energy, but the detonator becomes fragile and difficult to produce in large volumes
Solution Approach 1:
The patent replaces the traditional mechanical assembly of tiny nichrome heating elements with a printed circuit board-based electrical system. The heating element is integrated into the PCB as a trace or dedicated heating zone, eliminating the need for separate component assembly. This substitution of mechanical assembly with electrical/printed circuit technology resolves the contradiction by enabling mass production through standard PCB manufacturing processes while maintaining reliable electrical initiation capability.
Solution Approach 2:
The patent changes the physical parameters of the heating element by transitioning from a discrete wire-wound or foil nichrome element to a PCB-integrated resistive trace. This parameter change includes modifying the resistance distribution, thermal mass, and geometric configuration to be compatible with PCB fabrication processes. The result is a heating element that can be reliably manufactured in high volumes through automated PCB production while maintaining the electrical properties needed for detonator initiation.
2Volume of moving object
If a small nichrome heating element is used, then the detonator initiator can be compact, but it becomes difficult to inspect and handle
Solution Approach 1:
The patent merges the heating element, electrical connections, and mounting structure into a single integrated PCB assembly. The heating trace is directly formed on the PCB substrate with electrical traces and connection points, eliminating the need for separate handling of multiple small components. This integration maintains compact overall dimensions while dramatically improving ease of inspection and handling, as the entire assembly can be visually inspected and manipulated as one unit rather than assembling multiple tiny parts.
Solution Approach 2:
The patent uses PCB fabrication processes to create precise replicas of the heating element pattern across multiple units simultaneously. The resistive heating trace is copied onto the PCB substrate through standard printing and etching processes, ensuring consistent geometry and electrical properties across all production units. This copying approach enables mass production of compact, uniform initiators that are easy to handle and inspect.
3Reliability
If resistors are added to restrict current flow for safety, then the nichrome heating element is protected from destruction, but the device complexity increases
Solution Approach 1:
The patent merges the current-limiting resistor function directly into the PCB circuit design, integrating it with the heating element trace rather than using separate discrete resistor components. The PCB trace itself is designed to provide the necessary resistance for current limitation, or a single integrated resistor element is incorporated into the same PCB layer structure. This integration reduces device complexity by eliminating separate components and simplifying the assembly process while maintaining the protective current-limiting function.
Solution Approach 2:
The patent changes the implementation approach for current limitation by transitioning from discrete resistor components to a PCB-integrated resistive element. The resistance value and power handling characteristics are adjusted through PCB trace geometry, material selection, or integrated component design. This parameter change simplifies the overall device structure while maintaining the essential safety function of current restriction to protect the heating element.
4Reliability
If a robust detonator design is implemented for harsh conditions, then durability improves, but manufacturing scalability may be reduced
Solution Approach 1:
The patent replaces traditional mechanical assembly processes with PCB-based electrical and thermal integration. The robust, durable design is achieved through the inherent strength and environmental resistance of PCB substrates and soldered connections, which can withstand harsh conditions better than hand-assembled wire and component connections. This substitution enables automated PCB manufacturing processes to produce durable initiators at high volumes simultaneously, resolving the contradiction between robustness and manufacturing scalability.
Solution Approach 2:
The PCB-based design creates a universal platform that can produce multiple functions and configurations within a single manufacturing process. The same PCB fabrication process can generate different heating element geometries, resistance values, and connection patterns to meet various durability requirements while maintaining consistent quality and enabling high-volume production. This universality allows robust designs to be scaled efficiently across different application requirements.
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 provides a robust and reliable detonator initiator that can be easily scaled in manufacturing, operates effectively in harsh conditions, and is configurable for use in existing technologies, with optional RFID technology for inventory and tracking functions.
Implementation Method 1
The nichrome heating element 100 is 38-gauge (0.00397'' diameter) wire or smaller. The nichrome heating element 100 typically has a resistance of less than 1Ω. The resistors 104a and 104b add safety to the nichrome heating element by restricting current flow for low voltages.
Implementation Method 2
The present invention incorporates a high-power resistor for ignition
Implementation Method 3
a thermally conductive substrate allowing for operation at high temperatures which is mounted on an FR4 circuit board
Data Source
AI summary
The present invention is directed toward an addressable ignition stage which produces an output sufficient to detonate a secondary explosive, generally. The present invention comprises addressability and ignition functions that may be used together or separately to incorporate a high-power resistor with a thermally conductive substrate allowing for operation at high temperatures for ignition. The ignition stage is amendable to high volume production, exhibits a high degree of reliability, robustness and operational dependability for use alone or configurable into existing technology.