Emergency Protection Detection TRIZ Cases
- AC Fault Detection by Fast Current Transition Sensing
Detects low-amplitude electrical faults in converter-fed AC installations by sensing rapid current sign changes without lowering trip thresholds.
- Electronic Circuit Breaker Fail-Safe for MOV Overheating
Temperature sensing on MOV overvoltage components lets the breaker open on overheating or startup heat rise before leakage-current failure.
- Hybrid Changeover Switching for Low-Heat Uninterruptible Power Transfer
Mechanical bypass paths and semiconductors enable uninterrupted source transfer with low resistance, passive cooling, and less noise.
- Solid-State Breaker Pulse Chopping for Selective Coordination
Repeated fault-current pulses let an upstream solid-state breaker trip only the downstream thermal or magnetic breaker without overheating.
- GFCI Controller Logic for Distinguishing Faults From Self-Tests
Microcontroller reference-signal comparison helps a GFCI separate real ground faults from self-test conditions and avoid false trips.
- Power Control Unit Load Gating for Circuit Overload Prevention
Distributed power control units track circuit load and block new devices before breaker limits are exceeded, reducing trips and fire risk.
- Latching Relay Pulse Control for Low-Loss Overcurrent Switching
Zero-cross synchronized shaped pulses let a latching relay switch large AC currents with low loss while limiting bounce, overheating, and overcurrent damage.
- DC Load Zone Ground Fault Localization by Connection Timing
Correlating fault detection with recent load-zone connection times pinpoints the faulty DC branch without extensive common-mode current measurements.
- Low-Leakage ESD Clamp Circuit With Parasitic SCR Discharge
Removing resistive bias dividers lets this ESD clamp cut standby leakage and chip area while a parasitic SCR adds a low-impedance discharge path.
- Single-Pin Short-to-Ground Protection With Automatic Recovery
A single sense pin and integrated switch logic detect shorts to ground, cut current, and automatically restore normal operation.
- Digital Ground Fault Detection for Low-Nuisance AC Protection
DSP compares hot and neutral AC currents to trip on real ground faults, reduce nuisance trips, and provide clearer fault indication.
- Contactor Economizer Failure Detection to Prevent Premature Tripping
An overcurrent status monitor detects contactor economizer faults and keeps the coil actuated to avoid premature tripping.
- High-Resistance Ground Fault Direction Detection at a Power Switch
Voltage-based source and load-side sensing identifies ground fault direction faster, with less hardware and less load interruption.
- TRU Backfeed Interlock Using AC/DC Sensing and Contactor Isolation
When AC input is lost but DC remains present, a TRU backfeed sense module opens the contactor to isolate the DC bus and prevent alternate-source overload.
- Leakage Protection Circuit With Variable Pull-Down Current Control
Variable pull-down current smooths DC bus voltage mutations in multi-light lighting systems, preventing false leakage triggering.
- Electrical Cabinet Breaker Trip Detection Using Acoustic Signatures
Acoustic monitoring in electrical cabinets detects circuit breaker trips without radio-equipped devices, cutting retrofit cost and false alarms.
- Variable Sense Resistor Current Detection in Power Supplies
A switchable sense resistor lets one power supply measure both low and high load currents accurately while reducing A/D converter and part count.