Crash Detection Circuit Using Transformer Isolation
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Solution Overview
Problem
Existing crash detection circuits for vehicles are expensive, lack robustness, have a short lifetime, and cannot transmit differentiated signals due to reliance on optocoupler units, which fail to accurately detect crashes based on current conditions.
Innovation Solution
A crash detection circuit using a voltage divider circuit with comparators and a window comparator to define voltage windows, allowing for the detection of crash conditions by comparing output voltages to reference voltages, enabling the transmission of both positive and negative signals and improving robustness and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optocoupler units are used for galvanic isolation in crash detection circuits, then isolation between crash signal generation circuit and evaluation circuit is achieved, but the system becomes expensive, lacks robustness, has short lifetime, and cannot transmit differentiated signals
Solution Approach 1:
The patent replaces the optical coupling mechanism (optocoupler) with an electrical coupling mechanism using a transformer. The transformer provides galvanic isolation through magnetic coupling between primary and secondary windings, eliminating the need for light-based transmission while enabling robust signal transmission with the ability to differentiate between positive and negative signals.
Solution Approach 2:
The patent introduces a transformer as an intermediary component between the crash signal generation circuit and the evaluation circuit. This transformer serves as a mediator that provides galvanic isolation while allowing signal transmission, replacing the optocoupler's function with a more robust electrical-based intermediary that supports differentiated signal transmission.
2Adaptability or versatility
If optocoupler units are used for signal transmission, then galvanic isolation is achieved, but the system cannot transmit differentiated (positive and negative) signals
Solution Approach 1:
The patent changes the transmission parameter from light intensity (which cannot represent positive/negative differentiation) to electrical voltage polarity. The transformer-coupled circuit can transmit both positive and negative voltage signals, enabling the evaluation circuit to distinguish between different signal polarities and achieve more accurate crash detection based on signal differentiation.
3Ease of manufacture
If voltage divider circuit with comparators is used instead of optocoupler, then cost is reduced and robustness is improved, but circuit complexity increases
Solution Approach 1:
The patent segments the crash detection system into distinct functional modules: a crash signal generation circuit, a transformer for isolation, a voltage divider circuit for voltage scaling, and comparator circuits for threshold-based detection. This segmentation allows each module to be optimized independently, using cost-effective components while maintaining overall system functionality and robustness.
Solution Approach 2:
The patent uses standard, readily available electronic components (transformers, voltage dividers, comparators) that can be mass-produced and easily replaced. These conventional components are copied from established design patterns, avoiding the need for specialized optocoupler units and reducing manufacturing costs while improving availability and robustness.
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 cost-effective, robust, and long-lasting crash detection system capable of accurately distinguishing between crash and non-crash conditions, enhancing vehicle safety by efficiently implementing fire and non-fire conditions.
Implementation Method 1
a first transformer unit (90) that is electrically coupled to a secondary circuit, wherein a first inductor (91) forming a part of the primary circuit is magnetically coupled to a second inductor (92) that forms a part of the secondary circuit
Data Source
AI summary
Embodiments of the present invention provide a crash detection circuit for detecting a crash of a vehicle and including a transformer including a first inductor as a part of a crash signal generation circuit, and a second inductor as a part of a crash signal evaluation circuit, and galvanically isolated from the first inductor, a first comparator including an output, an inverting input coupled to a first terminal of the second inductor, and a non-inverting input electrically coupled to a second terminal of the second inductor, and a window comparator including a first input terminal electrically connected to the output of the first comparator for an input voltage to be evaluated, and two second input terminals for receiving reference voltages.