Dual-Mode Pulse Gate Driver for Safe Pyrotechnic Circuit Testing
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Solution Overview
Problem
Existing safing logic and fire set (SLFS) systems face challenges in reliably testing ignition safety devices (ISDs) and electronic safe and arming fuze (ESAF) systems without causing unintended pyrotechnic chain reactions, especially during long-term storage and maintenance, due to the risk of high voltage applications.
Innovation Solution
A dual-mode pulse gate driver apparatus with a trickle charge capacitor and high impedance circuitry that allows for safe testing of the circuit in a first mode without applying high voltage to the input power circuitry, and subsequent operation in a second mode to initiate a pyrotechnic chain reaction by preventing high voltage from being applied to the input power circuitry during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage is applied to test the circuit, then the circuit can be tested for pyrotechnic operation, but the input power circuitry may be damaged
Solution Approach 1:
The patent divides the testing function into two separate modes: a first mode for safe electronic testing without high voltage, and a second mode for pyrotechnic testing with high voltage. This segmentation allows the circuit to be tested at different levels of intensity, preventing damage to the input power circuitry during routine testing while maintaining the ability to perform full pyrotechnic tests when needed.
Solution Approach 2:
The patent implements preliminary electronic testing in the first mode before proceeding to high-voltage pyrotechnic testing in the second mode. This preliminary action allows the system to verify circuit functionality and detect faults early, preventing unnecessary high-voltage application that could damage the input power circuitry.
2Reliability
If the circuit is designed for single-event application, then pyrotechnic reliability is ensured, but the system cannot be tested after assembly or long-term storage
Solution Approach 1:
The patent makes the circuit multi-functional by enabling it to operate in two distinct modes: a first mode for electronic testing and a second mode for pyrotechnic operation. This universality allows the same circuit to serve both testing purposes and actual pyrotechnic activation, eliminating the need for separate testing mechanisms while maintaining pyrotechnic reliability.
Solution Approach 2:
The patent introduces dynamic switching between two operational modes based on the testing or operational requirements. The circuit can dynamically transition from the first mode (electronic testing) to the second mode (pyrotechnic operation), providing adaptability for post-assembly and long-term storage testing while ensuring reliable pyrotechnic performance when needed.
3Ease of operation
If high voltage is applied during testing, then pyrotechnic chain reaction can be initiated, but safety of personnel and equipment is compromised
Solution Approach 1:
The patent segments the operational capabilities into two distinct modes: a first mode that provides electronic testing functionality without high voltage (ensuring safety), and a second mode that enables pyrotechnic initiation with high voltage (ensuring operational capability). This segmentation allows safe routine operations while maintaining the ability to initiate pyrotechnic chain reactions when required.
Solution Approach 2:
The patent implements preliminary anti-action by providing a safe first mode for electronic testing that prevents unintended pyrotechnic activation during routine operations and maintenance. This preliminary safe mode reduces safety risks to personnel and equipment while maintaining the capability to initiate pyrotechnic chain reactions in the controlled second mode when actually 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
Enables safe testing of SLFS systems without damaging the electronics, ensuring the SLFS apparatus remains operational for intended pyrotechnic applications while preventing inadvertent ignition, thus ensuring the safety of personnel and equipment.
Implementation Method 1
a high impedance coupled to the trickle charge capacitor and input power circuitry, the high impedance trickle charging the trickle charge capacitor and preventing a high voltage through the switch from being applied to the input power circuitry
Data Source
AI summary
Embodiments relate to safing logic and fire set systems with a dual-mode pulse gate driver device and method of use. An aspect includes a device for a circuit having a switch, the device comprising: a gate driver including a trigger input to receive a trigger signal to initiate a test of the circuit in a first mode or a pulse through the circuit to cause a pyrotechnic chain reaction in a second mode, a power supply input and an output for driving the switch in response to receiving the signal. The device includes a trickle charge capacitor coupled to the power supply input. The device includes a high impedance coupled to the capacitor and input power circuitry, the high impedance trickle charging the capacitor and preventing a high voltage through the switch from being applied to the power circuitry in the first mode for subsequent operation in the second mode.