Fault Detection Circuit for Rapid Electronic Component Protection
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Solution Overview
Problem
Existing protective circuit arrangements are ineffective in environments with large temperature fluctuations, have slow response times, and can be damaged by overvoltage or overcurrent, failing to provide rapid and continuous protection for electronic components.
Innovation Solution
A protective circuit arrangement that includes a fault detection region, a fault signal processing region, and a disconnection region, capable of quickly disconnecting electronic devices from fault sources, adaptable to various applications, and designed to operate effectively across a wide temperature range without risk of damage from excessive current or voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If field effect transistors are switched into the current path for current limiting, then current protection is provided, but power dissipation becomes substantial and response time is slow
Solution Approach 1:
The patent extracts the protective function from the main current path by using a separate detection circuit that monitors current through a shunt resistor. The protection is activated only when fault conditions are detected, rather than continuously switching transistors in the current path. This eliminates continuous power dissipation while maintaining protection capability.
Solution Approach 2:
The patent introduces an intermediary detection circuit with a shunt resistor and comparison amplifier that mediates between the current path and the protection mechanism. This intermediary circuit detects fault conditions and triggers protection only when necessary, avoiding continuous power dissipation associated with always-active transistor switching.
2Reliability
If temperature-dependent resistors are used for protection, then temperature-based protection is provided, but the circuit is ineffective at temperatures outside the working range and response time is slow
Solution Approach 1:
The patent replaces temperature-dependent resistors (passive thermal response) with an active electronic detection circuit that uses a shunt resistor, operational amplifier, and logic circuit. This electronic system can detect and respond to fault conditions across the entire operating temperature range without being limited by the narrow working range of passive thermal components.
Solution Approach 2:
The patent changes the detection parameter from temperature-dependent resistance (which has limited range) to voltage drop measurement across a shunt resistor. This parameter change enables detection of overcurrent and overvoltage conditions across the full operating temperature range, as the shunt resistor's performance remains stable across temperatures.
3Device complexity
If protective circuit arrangements with slow response time are used, then circuit simplicity is maintained, but the protected component is already destroyed by the time protection activates
Solution Approach 1:
The patent implements rapid detection and response by using a fast-response operational amplifier and logic circuit that immediately detect fault conditions and activate protection. The circuit rushes through the detection and response process in microseconds, far faster than thermal or mechanical protection mechanisms, preventing damage before it occurs.
Solution Approach 2:
The patent uses an intermediary detection circuit with high-speed operational amplifiers and logic gates that mediate between the fault condition and the protection mechanism. This intermediary circuit processes fault signals rapidly and triggers protection immediately, achieving fast response without excessive complexity.
4Reliability
If protective circuit arrangements are designed for high temperature operation, then high temperature protection is provided, but the circuit becomes ineffective at low temperatures
Solution Approach 1:
The patent creates a universal protection circuit that functions across the entire operating temperature range by using electronic components (operational amplifiers, logic circuits, shunt resistors) whose performance is stable across temperatures. The circuit provides both overcurrent and overvoltage protection regardless of temperature, making it universally effective unlike temperature-specific protective devices.
Data Source
AI summary
A circuit arrangement for protecting an electronic device from damage upon a fault. The circuit arrangement includes at least one first terminal, at least one second terminal, a first interface and a second interface, a fault detection circuit region, a fault signal processing circuit region, and a disconnection circuit region. The at least one first terminal is coupled to the at least one second terminal in a fault-free state, the fault detection circuit region is coupled to the fault signal processing circuit region, the fault signal processing circuit region is coupled to the disconnection circuit region, the disconnection circuit region is configured to disconnect at least one of the at least one first terminal and the at least one second terminal, and the fault detection circuit region, the first and second interfaces, and the disconnection circuit region are configured to be compatible with another different fault signal processing circuit region.