Emergency Protection Detection TRIZ Cases
- Virtual Voltage RMS Detection for Fast Multi-Phase AC Faults
Shortened T/2/N sampling reconstructs a virtual voltage for faster multi-phase AC RMS fault detection without losing accuracy.
- Pulse-Width Fault Power Control for Human-Safe Energy Limiting
Progressive pulse-width reduction limits cumulative fault energy without lowering current amplitude, helping meet human safety thresholds.
- GFCI Trip Circuit Using Independent Electromagnetic Tipping
A simple comparator and independent trip coil help this GFCI detect unbalanced current fast and cut power with lower circuit complexity.
- Electronic Trip Unit Thermal Failure Prediction for Semiconductor Protection
Current and voltage monitoring predicts semiconductor thermal failure in microseconds, allowing the interrupter to trip before damage.
- Distance Protection Elements With Transient-Compensated Zone Boundaries
Adaptive compensation stabilizes mho and quadrilateral zone boundaries during transients to prevent overreach and false breaker trips.
- Isolation FET Circuit for DC Fault Isolation in Storage Converters
An isolation FET detects DC-side faults and disconnects a faulty power converter from shared batteries without costly drive circuits.
- Electronic Fuse Shutoff Using I²t Wire Protection
By tracking current squared over time, this fuse shuts off before prolonged spikes overheat vehicle wiring, enabling lighter wire sizing.
- Low-Voltage Circuit Breaker with Semiconductor Inrush Limiting
A semiconductor branch switched in cycles limits motor and load inrush current, avoiding nuisance trips and extra starter hardware.
- Broken Conductor Detection Using Sequence Current Ratios
Local zero-, negative-, and positive-sequence current ratios enable fast broken conductor detection and de-energization without communication links.
- Overvoltage Protection Circuit Checking via Single Voltage Tap
A single voltage tap and switched protection units verify electric machine overvoltage circuits, catching defects before downtime.
- Backfeed Protection Switch Control for De-Energized Utility Grids
A monitored power switch blocks residential backfeed into a de-energized utility grid, protecting line workers during outage restoration.
- DC/DC Power-Side Shutdown for Reverse Current Protection
A pre-short shutdown path diverts reverse current before switch turn-off, protecting DC supplies and improving converter reliability.
- Power Electronics Monitoring With Heterogeneous Fault Comparison
Heterogeneous reciprocal comparison monitors power electronics with adaptable thresholds to cut false positives, chip area, and cost.
- DC/DC Power-Side Shutdown Using Short-Circuit Reverse Current Relief
A temporary power-side short gives reverse current a safe path before switch-off, reducing shutdown damage risk in parallel DC converters.
- Three-Phase GFCI Zero-Cross Trip Timing for AC Contactors
Zero-cross trip timing lets a three-phase GFCI use standard AC contactors while meeting UL943(C) trip time and harmonic filtering needs.
- Shared-Tap ESD Clamp Circuit for Low-Voltage IC Protection
Shared tap regions let diodes and the ESD clamp discharge surge current faster with lower clamping voltage and less circuit area.
- Networked Ground Fault Detection for Multi-Source Power Buses
Current flow direction from existing bus sensors is shared over a high-speed network to locate ground faults in multi-source power systems.
- Hybrid Circuit Breaker Topology for Fast Fault Current Limiting
Combined voltage-limiting modules replace the auxiliary switch to cut losses and interrupt short-circuit current in under 1 ms.
- Electrical Protection Switching for Short-Circuit Current Limiting
Semiconductor switching and voltage limiting curb short-circuit current stress while preserving enough tripping energy for the circuit breaker.
- Self-Protecting Circuit Breaker With Relay Lockout for DC Faults
Uses fixed current sensing and relay lockout to stop reclosure during persistent DC faults while holding Class 2 output near 60 VA.
- Self-Biasing ESD Power Clamp Without Voltage Dividers
A self-biasing MOSFET clamp replaces large voltage dividers to switch from high to low impedance during ESD events, cutting area and cost.
- Hybrid Circuit Breaker Voltage Staging for Fast Fault Interruption
Staged limiting voltages let a hybrid breaker match switch dielectric strength, cutting losses and interrupting DC faults faster.
- DC Hybrid Circuit Breaker With Reverse-Biased Arc-Free Commutation
A reverse-biased voltage source commutates fault current without arcs, cutting on-state losses and mechanical switch wear in DC hybrid breakers.
- Circuit Breaker Load Switching for Predictive Fault Isolation
Sensor-driven load switching adds redundant branch disconnection and early fault prediction to reduce electrical hazards and manual wear.
- Series Hybrid Circuit Breaker Using Ripple Current Zero Crossings
A transient counter-voltage pulse turns fault current into ripple zero crossings, enabling fast three-phase interruption with lower loss and fewer components.
- Utility Conductor Event Detection With Local Protective Response
Distributed conductor sensors and a local control station detect displaced line events in seconds and trigger downstream protective actions.
- Circuit Breaker Fault Logic for Selective Load Disconnect Reset
Nuanced fault logic isolates only affected loads during low-severity faults, then auto-resets disconnects to avoid full breaker trips.
- Vehicle Power Distributor PCB Thermal Overload Protection
Direct PCB conductor temperature sensing replaces current-based overload estimates, cutting false shutdowns and MOSFET complexity in vehicle power distribution.
- Photocoupler LCDI Circuit for Arc-Fault Power Cord Shutdown
Photocoupler-based leakage and arc-fault detection cuts appliance power when damaged cords generate hazardous fault signals.
- AC Freewheeling Circuit for Inductive Load Overvoltage Control
A switched freewheeling path monitors load voltage and current to let inductive current decay without AC source shorting or excess oscillation.