Ac-Dc Conversion TRIZ Cases
- Brushless Motor Drive Reducing Noise at Low Speeds
A brushless motor drive estimates rotor position using open-phase voltage measurements to enable precise control.
- Composite Cascaded HV and LV Modules for Transformer Insulation
A composite cascaded topology connects high-voltage and low-voltage modules with a DC-to-DC converter to supply driving circuits.
- PWM Control Circuit Synchronization for Interference Reduction
Synchronizes PWM control circuit edges to minimize electromagnetic interference through precise timing adjustments.
- Parallel Inverter Device Autonomous Phase Control
A parallel inverter device autonomously synchronizes voltage and phase using MOSFET switching to prevent cross currents without external control lines.
- Rectifier Clamping Voltage Control for MOSFET Thermal Overload
Time-controlled clamping voltage compensation prevents thermal overloading during load shedding events.
- Power Converter Voltage Control for PV Array Overload
A system controller selects reduced power operating points to adjust photovoltaic array voltage and maintain stable output.
- Voltage Source Converter Control for Switching Loss Reduction
Segmented switching elements with independent saw tooth references reduce energy loss and harmonic distortion while maintaining voltage balance.
- High-Voltage Rectifier Using Standard CMOS Transistors
Segmenting the bridge full-wave rectifier into multiple transistor stages allows standard low-voltage CMOS components to withstand peak-peak voltages exceeding 10V without gate oxide breakdown.
- Grid-Forming Inverter Control for Severe Event Response
A grid-forming inverter controller switches to a modified operating mode with low inertia during severe grid events.
- Three-Level Active Neutral Point Converter Fault Protection
Internal inductances limit transient currents and torques, eliminating external chokes that increase mass and energy losses.
- Predictive Thermal Management for Frequency Converter Power Semiconductors
A frequency converter calculates typical heating of power semiconductors to determine a dynamic temperature limit and adjusts operation mode accordingly.
- Matrix Converter Commutation Method Using Zero-Crossing Detection
A commutation method for matrix converters uses zero-crossing detection to reduce switching time.
- Pseudo Zero Vectors for Space Vector Modulation
Pseudo zero vectors allow accurate current construction during sector border crossings, reducing torque ripple in single-shunt sensing.
- Charge Pump Deep N-Well Biasing for Parasitic Junction Control
Deep N-well biasing scheme manages NMOS devices in charge pump stages to prevent parasitic PN junction activation.
- Modular Multilevel Converter Bypass Switch Monitoring
Parallel voltage sensors detect open or closed states and contact resistance to prevent fire hazards from malfunctioning bypass switches.
- Inverter Islanding Detection via Harmonic Change Rates
Monitoring individual harmonic change rates eliminates the detection dead zone inherent in aggregate THD methods, improving reliability.
- Dynamic Intermediate Circuit Capacitance for Voltage Ripple Compensation
Segmented capacitors switch configurations based on detected ripple, reducing size and weight while maintaining reliability.
- Superjunction Transistor Doping Profiles for Avalanche Robustness
A superjunction transistor device uses segmented drift and compensation regions with optimized doping concentrations to reduce specific on-resistance.