Ac-Dc Conversion TRIZ Cases

Separating PWM calculation and register updates across two cores keeps double-sampled inverter data coherent despite control interrupt delays.

Square-wave or trapezoidal submodule control converts averaged electrical energy into resistor heat for stable braking in modular multilevel converters.

A shaft-mounted starter-exciter replaces separate motor and exciter units to shrink rotating stabiliser footprint, maintenance, cost, and noise.

By timing transistor turn-on at zero or valley voltage, this control approach cuts inverter switching loss and supports higher-frequency operation.

Valley current mode control balances flying capacitor voltage in a multi-level switching converter without extra sensing circuits or compensation loops.

Phase-shifted lower-carrier PWM balances neutral-point potential and halves common-mode voltage in T-type three-level converters.

Variable PWM periods raise weld current quickly while keeping transformer magnetization balanced and avoiding over-engineered hardware.

Controllable semiconductor switches pre-charge the DC bus capacitive network and dissipate braking energy without contactor faults.

Dynamic switch-count control cuts inverter power loss by matching parallel switch activation to expected current in each operating range.

A separated Schottky and surge-current conduction layout disperses heat and protects gate oxide films during reverse-current surges.

Model predictive pulse pattern control adjusts converter switching times to curb harmonics, cut losses, and respond quickly to transients.

Series-connected DC load legs use solid-state transformers and secondary converters to simplify voltage control and enable independent current sharing.

A toroidal transformer and separate oscillator circuits measure tiny differential currents through dwell-time timing, improving sensitivity without complex circuitry.

Ground fault detection stops converter switching and opens the AC breaker to prevent overcurrent and suppress DC-side voltage.

A single-trigger bidirectional bypass circuit protects MMC energy stores from surge currents and fault discharge without complex thyristor triggering.

Selective growth in hollow templates integrates different WBG doping stacks on one carrier, cutting fabrication cost and complexity.

Switching energy elements between series and parallel states cuts charge-sharing loss in capacitive loads and supports AC driving.

Duty-ratio and phase-shift adjustment balances flying capacitor voltage under light load and high-frequency switching without current polarity detection.

Selective rectifier phase handling cuts robot actuator power waste during low-load operation while preserving high-load supply capability.

Alternating in-phase and out-of-phase half-bridge drive cuts switching loss, balances coil current, and avoids resonance.

A sandwiched high-voltage switch and two MOSFETs enable bidirectional current blocking and conduction with lower loss and smaller footprint.

Reconfigurable MPC lets a PV multilevel inverter keep grid-compatible AC output after switch or capacitor faults by shifting voltage levels.

Coordinated current targets let parallel inverters balance output, limit transient AC currents, and improve islanded power stability.

A master-guided current-sharing scheme keeps parallel islanding inverters balanced and stable without high-speed communication.

A stacked ISOP converter module uses a metal core board and 3D cooling paths to handle high voltage with less heat, EMI, and PCB stress.

On-board current pulses and voltage-drop sensing estimate antiparallel inverter diode junction temperature in operation with higher accuracy.

Compensation switching and carrier-synced mode changes suppress voltage error, current variation, and torque fluctuation in power converters.

Harmonic frequency control lets induction heating and wireless power transfer run together without audible beat noise in a kitchen appliance.

A stacked push-pull amplifier uses waveform shaping and LC paths to cut peak switch voltage while sustaining high-efficiency ZVS across loads.

Local control boards split power converter commands across submodules, cutting processing delay and enabling faster fault response.

A freewheeling-loop inverter circuit splits 120V and 240V output without an isolation transformer, cutting size, cost, and loss.

Staggering AC phase switching during zero-vector synthesis cuts common-mode currents and EMI without adding filter hardware.

Dynamic switching frequency keeps stacked DAHB circuits soft-switching in a three-phase partial power inverter, cutting losses and hardware size.

A four-switch flying-capacitor primary circuit spreads voltage stress, enables faster smaller switches, and helps avoid transformer saturation.

A four-legged solid-state transformer with ESS redirects and absorbs common-mode pulse energy to prevent saturation and waveform distortion.

Independent phase duty-ratio control balances semiconductor losses in NPC converters while reducing neutral point current and DC-link capacitor RMS current.

A pre-detection circuit monitors high-side and low-side PWM transitions and briefly pulses the low-side path to prevent latch-up.

A multiplex pin with switched bias current replaces diode-based sensing to improve temperature and input-voltage protection accuracy.

Pulse-based monitoring compares voltage and current slew rate ratios to detect power converter degradation without continuous high-rate sampling.

A tuned series resonant circuit shunts PWM-frequency harmonics from the inverter, reducing power-source load and cable heating.

Startup pulse slew-rate ratios reveal power converter degradation without continuous high-speed sampling or complex monitoring hardware.

Pre-charging and voltage feedback let a UPS relay switch safely under unbalanced three-phase input, avoiding impact-current damage.

A neutral-wire switching circuit lets a three-phase photovoltaic inverter change modulation modes to cut switching loss while handling phase imbalance.

PCC voltage feedback modulates q-axis current to damp low-frequency oscillations and improve inverter stability in weak grids.

Dynamic duty-cycle control lets a single-stage resonant converter deliver galvanic isolation, buck-boost operation, and wider OBC voltage support.

A dual-stage LED driver with microcontroller feedback keeps brightness stable despite phase-cut dimmer angle changes, transients, and drift.

A surge bypass path diverts transformer tank current during cycloconverter shutdown to prevent FET avalanching and resist voltage surges.

An auxiliary circuit with an asymmetrical transformer pre-charges switch capacitances to cut inverter switching losses without large resonant parts.

Programmable capacitor switching lets a welding inverter maintain zero voltage switching while avoiding efficiency loss under changing weld conditions.

Transforms dq current commands to the grid phase so active and reactive power can be limited separately despite phase shift.

Series switch and capacitor strings place snubbers on local conductors, damping ringing with smaller lower-voltage components.

Averaging converter droop values and correcting their mean toward zero maintains load sharing while reducing frequency drift in parallel AC converters.

Small disturbance signals added to droop control enable fast, accurate VSG inverter islanding detection without destabilizing output voltage.

A hardware state machine drives AC battery modules into bypass and disconnects the controller fast enough to keep the traction system safe after faults.

By timing switch pulses to the minimum switch-off voltage, this QR inverter control cuts IGBT switching loss and extends induction cooktop life.

A four-switch chain-link module uses split capacitors to generate positive, zero, or negative voltage while lowering conduction losses and clearing DC faults.

Restricting multilevel inverter output to positive, zero, and negative states prevents capacitor imbalance shutdown during grid disturbances.