Ac-Ac Conversion TRIZ Cases

Temperature sensors and feedback control detect abnormal heating in switching elements and boost cooling or limit current to prevent thermal runaway.

Comparator-based monitoring uses existing power converter terminals to detect switch states and estimate COTS component health without modification.

Phase-shifted PWM across multiple inverters cancels harmonic emissions, enabling smaller DC link capacitors and lower cable losses.

A handshake-triggered bypass switch keeps cascaded converters running through cell controller or power supply faults and helps prevent stator shorts.

Shared switching elements let multiple induction coils deliver power with less circuit complexity while controller-set frequencies suppress audible interference noise.

High-frequency switches with capacitors and inductors step down AC voltage without a transformer, cutting cost while improving regulation.

Comparator-based terminal voltage sensing infers internal switch states in COTS power converters without modification, enabling health and life monitoring.

Dynamic DC voltage control uses detected AC voltage and current to prevent overmodulation while cutting switching loss, noise, and heat.

Real-time voltage monitoring detects DUT disconnects and switches the converter to ground voltage to drain residual energy and resume operation quickly.

Hybrid UPS control matches inverter and input voltages before bypass transfer to limit inrush current and protect SCRs.

Separate control and operation-permission lines let slave stations halt power safely and help pinpoint daisy-chain communication failures.

A dual-branch PFC circuit raises switching frequency to improve small-vessel heating and suppress operating noise in induction heaters.

Staggered switch timing across multiple power controllers cuts thyristor-like harmonics while preserving precise AC power delivery.

A combined resistive and capacitive divider samples DC-link voltage mid-PWM cycle to improve converter accuracy and cut motor losses and noise.

Modular converter chains regulate AC voltage and phase between two grids, avoiding costly back-to-back converters and reducing losses.

A parallel fuse and capacitive element limits surge current and preserves unaffected DC link capacitors during short circuits.

Phase-shifted PWM carriers and timed current updates improve AC-side current response while minimizing switching ripple in parallel converters.

An IC-integrated compensation circuit stabilizes active EMI filtering under varying DC input while cutting filter size and cost.

Dynamic inverter pulse-frequency control balances overload current, heat, and audible noise in conveyor frequency converters.

A shared PFC and inverter switching leg regulates UPS output voltage while avoiding double conversion to improve efficiency and reduce size.

A combined PFC and series-active-filter UPS regulates series capacitor voltage to improve power quality while reducing double-conversion losses.

A UPS controller matches inverter reference voltage to input voltage during bypass-to-online transfer to curb inrush current and protect SCR switches.

A UPS controller drives circuit current to zero before disconnect, preventing arcing, extending switch life, and lowering maintenance cost.

Adjusting DC link voltage with motor speed and inverter output cuts temporal harmonics and magnetic losses without extra filters.

A nine-switch resonant front end combines PFC and conversion stages to cut semiconductor count, switching losses, DC ripple, and EMI.

Two elevator power converters switch inverter and regenerative roles by temperature to balance stress, extend service life, and keep the drive compact.

Controlled third-harmonic circulating current extends delta-connected multilevel converter power range while reducing DC capacitor voltage fluctuation.

Adaptive load current tracks dimmer conduction time to keep thyristors latched while cutting unnecessary LED dimming power loss.

Staggered switch-on and switch-off timing across multiple power controllers cuts harmonics while preserving precise AC power control.

Voltage unbalance compensation at rectifier intermediate nodes cuts DC ripple current and voltage, extending capacitor life in power converters.

A controllable load circuit trims dimmer current to the thyristor holding level, cutting LED power waste without losing switch function.

Adaptive gate logic switches GaN cycloconverter modes near zero crossings to cut drive power, avoid short circuits, and suppress ZVS overshoot.

Constant-current rectifier charging and voltage-triggered load pulses decouple pulsed demand from mains current to suppress THD.

Active gate current sourcing and sinking lets a bidirectional FET switch both polarities without shunting diode losses in power conversion circuits.

Separating the initial charging contactor from the main line limits capacitor inrush current while saving wiring space in a PWM converter.

Capacitor-voltage sensing lets an induction heater estimate load resistance and inductance accurately without high-speed controller sampling.

Mode-specific feed-forward gain keeps UPS capacitor voltage stable during inverter-bypass switching and sudden load changes.

By comparing 4f and 6f components in smoothed DC voltage, this case detects three-phase imbalance beyond phase-loss conditions.

Distributing DC voltage across MMC cells cuts capacitor and cable weight while keeping high-voltage AC and DC power conversion flexible.

A resonant switching circuit with added capacitance suppresses noise while improving heating of small or low-permeability cooking vessels.

A digitally controlled AC converter uses EMI and pi filtering to replace bulky iron-core transformers with lighter, more efficient voltage conversion.

An observer-based MPC estimates load current in a matrix converter, avoiding bulky sensors while improving voltage and current tracking.

A closed-loop coil harvests unused magnetic field energy to light a wireless cooktop indicator without added power circuits or wiring.

A multifunction key simulates digital input terminal actions in a power converter, removing external switches and wiring.

Adjusts dimmer current to exceed thyristor holding levels only when needed, cutting LED load power waste while maintaining conduction.

Replacing mechanical components with microcontroller-based control reduces device weight and improves response speed for stable power delivery.

A multilevel power converter uses phase-shifted carrier signals to reduce harmonic content in regenerative systems.

Anti-series transistors with RC timing control the closing speed of electromagnetic switches, reducing mechanical shock and self-heating.

An active filter in a power converter suppresses high-frequency disturbances from AC power supplies while reducing inverter switching losses.