Relays TRIZ Cases
- ERMS Control Circuit With Timed Automatic Deactivation
A delay timer automatically turns off the ERMS after a preset interval, reducing human error and improving remote switchgear maintenance reliability.
- Contactor Coil Control for Stable Attraction Under Current Drop
Abnormal current drop detection extends coil supply time only when needed, keeping contactor attraction stable while limiting energy use.
- Contactor Pull-In Control Using Abnormal Current Drop Detection
Abnormal current drop detection extends contactor pull-in time only when needed, improving attraction stability under harsh voltage or temperature conditions.
- Relay Coil Drive Circuit With Two-Level Voltage Economizer
A timed high-to-low coil voltage scheme cuts relay power dissipation and thermal rise while preserving reliable actuation.
- PWM Inductive Load Driver for Fast Solenoid Disconnection Detection
Current-change monitoring enables rapid solenoid disconnection detection in PWM inductive load drivers, improving safe-state response.
- Electromagnetic Switch Control for Vibration-Stable Contacts
Excitation current feedback detects vibration-driven contact movement and restores closed-state stability to prevent arcing and uncontrolled opening.
- Contactor Coil Driving Circuit With Shared PWM and Redundant Shut-Off
A shared PWM coil driver cuts contactor circuit complexity, board space, and EMI while preserving redundant shut-off paths for battery systems.
- Magnetic Latching Relay Drive Circuit for Single-Port Control
A capacitor and voltage comparators convert one control signal into ON and OFF relay commands, preserving compatibility with single-port relay circuits.
- Contactor Coil Voltage Control for Temperature-Compensated Closing
A two-stage coil voltage profile uses current-based temperature compensation to keep contactor closing behavior consistent without sensors.
- Electromagnetic Drive Circuit With Temperature-Adaptive Duty Control
Temperature and control-voltage feedback adjust PWM duty cycle to cut heat load, extend drive life, and ensure reliable switching.
- Relay Pulse Timing Control to Suppress Power Supply Ripple
Shifted pulse timing across multiple relays spreads current demand, suppressing power supply ripple while maintaining relay control.
- Bistable Relay Protection Control for Low-Voltage Contact Reliability
Alternating pull-in and release coil pulses keep bistable relay contacts oscillating at low voltage, cutting heat and improving fault detection.
- Relay Coil Current Sequencing to Suppress Inrush Current
A delayed switch from holding current to higher switching current suppresses relay coil inrush, cutting component rating and closed-state power use.
- Dual-Voltage Relay Coil Control for Lower Holding Loss
A high-voltage pull-in and low-voltage hold path cuts relay coil loss while maintaining contact state and preventing dropout.
- Relay Coil Inductance Monitoring for Weld Fault Detection
Measures relay coil inductance in the non-energized state to detect welded contacts without adding bulky monitoring hardware.
- Bus-Controlled Contactor Interlocking Without Auxiliary Cabling
Software interlocking in a bus system blocks impermissible contactor states while keeping communication active and removing auxiliary switches.
- Power-Saving Contactor Circuit with Active PFC and Square Wave Control
Active power factor correction circuit raises power factor from below 0.3 to above 0.9 while reducing active consumption to under 1 VA.