Ac-Dc Conversion TRIZ Cases
- Inverter Ground Reference Circuit for Voltage Transient Clipping
A snubber and threshold-triggered clipper route excess transient voltage to ground, protecting batteries from harmful potential imbalance.
- Inverter Grounding Circuit for Battery Transient Protection
Parallel resistor-capacitor grounding with snubber and clipper stages limits battery-to-ground voltage transients and extends battery life.
- Kinetic Charging Assembly With Vacuum Recovery and AC-DC Boost
A vacuum cavity cuts friction around a moving magnet sphere, while a bridgeless AC-DC boost circuit stabilizes low-voltage kinetic charging output.
- Series Power Flow Module for Harmonic Current Attenuation
A full-bridge inverter module isolates high-frequency harmonic currents and injects DC-link voltage to stabilize power flow on transmission lines.
- Parallel NPC 3-Level Inverter Without DC Midpoint Interconnection
Disconnected converter midpoints are balanced through zero-sequence control, cutting cabling complexity while preserving four-quadrant operation.
- Three-Level Inverter Balance Circuit for Midpoint Voltage Control
A balance circuit and bidirectional DC-DC converter keep split capacitor voltages equal, maintaining midpoint control under small and half-wave loads.
- Flipped conversion circuit and photovoltaic power generation system
A resonant half-bridge flipped conversion circuit cuts semiconductor count and enables zero-voltage turn-on to improve PV and HVDC conversion efficiency.
- UPS Relay Soft Start Circuit for Unbalanced Three-Phase Input
Voltage detection and pre-charging let a UPS relay close on the lowest-voltage phase, reducing impact current under unbalanced input.
- Grid-Forming Power Converter Fault Switching for Higher Short-Circuit Current
Lowering switch frequency during AC short-circuit faults cuts semiconductor losses and lets grid-forming converters deliver higher fault current.
- Grid-Connected Converter Control for High-Voltage Ride-Through
During grid overvoltage, the inverter is turned off and DC bus voltage is regulated to limit reverse inductor voltage and avoid off-grid trips.
- Modular Multilevel Converter Startup with Half-Bridge Cell Charging
Threshold-based deblocking charges MMC cells as half-bridges until operable voltage is reached, improving startup across converter configurations.
- Power Converter Control for Short-Circuit Ride-Through
Dynamic current-limit and voltage control lets an energy-storage power converter keep supplying AC during short circuits without shutdown.
- Series Inductor Coil Layout for High-Voltage Load Flow Control
A split high-voltage connection and external saturation branches enable series load flow control with lower insulation cost and a more compact layout.
- ARCP Inverter Modulation Switching for Neutral Point Balance
Dynamic switching between CPWM and DPWM cuts ARCP inverter losses while avoiding commutation failure from neutral point voltage unbalance.
- Electric Blanket Control Circuit With Split Main and Handheld Control
A split main and sub-control circuit moves bulky power components into the blanket, enabling lighter handheld heating control.
- Multi-Level Inverter PWM Logic for Inner Switch Voltage Protection
Delayed inner-switch turn-off and two-channel PWM logic protect ANPC inverter switches from high voltage stress at power-down and crossover points.
- ARCP Inverter PWM Control Under Neutral Point Voltage Unbalance
Dynamic CPWM and DPWM selection lowers ARCP inverter switching losses while preventing commutation failure from neutral point voltage unbalance.
- Multi-Level Converter Gate Driving With Split Switching Speeds
Different switching speeds across gate driver subsets balance converter losses and electromagnetic interference without added filters.
- Multi-Level Converter Gate Driving for EMI-Loss Balance
Different gate driver subsets switch at fast and slow speeds to balance converter losses and EMI without added filtering.
- Flying Capacitor Converter Voltage Division for High-Voltage Stress
Voltage-division capacitors and diode charging paths protect S2 and D2 from high input stress, avoiding breakdown and efficiency loss.
- Common-Mode Transformer Injection for Low-Frequency Noise Filtering
Multiple common-mode transformers and feedback-shaped injection voltages suppress converter common-mode noise at low switching frequency with smaller cores.
- Capacitor-Assisted Power Transfer for Inrush and Over-Voltage Control
An added capacitor circuit transfers current without interrupting the load, cutting inrush, over-voltage, charging time, and energy loss.
- Differential Modular Multilevel Converter With Reduced Capacitance
Fully differential pole voltages isolate switches from capacitors in zero state, cutting capacitance needs in high-voltage modular converters.
- Power Converter Maintenance Timing Using Reserve Module Failure Rates
Failure frequency and available reserve modules are compared to schedule power converter maintenance before spares are depleted.
- Three-Phase Inverter Overcurrent Protection by Phase During Grid Faults
Phase-separated overload blocking keeps healthy inverter phases running during grid faults, preserving dynamic control with smaller IGBT switches.
- Rail Vehicle Power-Line Control for Stable Battery Charge Sharing
Different charge and discharge thresholds stabilize battery sharing between rail vehicles and prevent overcharging or over-discharging.
- Switching Valve Shutdown Control for HVDC Voltage Overshoot
Randomized module blocking delays in an HVDC switching valve limit transient voltage overshoot during fault shutdown.
- Inverter-Based CTLE Topology for Low-Power Linear Equalization
A capacitor-coupled inverter CTLE cuts power use and avoids common-mode mismatch nonlinearity while preserving gain bandwidth.
- Inverter LCL Filter Notch Tuning for Resonance and Heat Loss
Using parasitic inductance in an inverter LCL filter creates a notch at the switching frequency, reducing resonance and damping heat loss.