Ac-Dc Conversion TRIZ Cases

A converter shifts between two-level, three-level, and zero-voltage transition modes to cut switching loss, EMI, and switch cost.

Dead-time pulse control samples switch states at signal edges to stop cross-conduction and protect synchronous converter components.

A four-vector space vector modulation scheme cuts common-mode voltage in multilevel inverters, reducing EMI filter size and weight.

Adjusting PWM carrier phase shift cuts high-frequency ripple and leakage current without added filters, cables, or lower power density.

Virtual impedance limits overcurrent in a grid-forming converter while preserving voltage source behavior and transient stability.

Sequence-current compensation with a rectifier-inverter stage balances three-phase transformer currents and suppresses negative and zero sequence flow.

Variable DC link control tied to motor frequency cuts startup voltage ripple in MMC motor drives without an external DC chopper.

Nighttime switch holding and resistor power draw keep a power converter housing warm, avoiding a separate space heater and added complexity.

Physical AC cutoff with a latching relay removes standby power while allowing user-triggered power restoration through the controller.

Gate-controlled inversion layer formation in a MOS controlled diode cuts reverse recovery and forward conduction loss in silicon power conversion.

A modified inverter SVM removes high-CMV redundant vectors to cut EMI noise and reduce passive filter size and weight.

Positive-sequence disturbance injection measures converter impedance accurately without primary-side changes or controller disclosure, even under weak grids.

Virtual impedance in a two-phase frame limits converter current during disturbances while preserving voltage-source behavior and grid stability.

A back-to-back full-bridge converter uses a shared DC link to raise reverse-dragging load capacity and deliver stable wind turbine output.

Bus-voltage and AC-current sensing trigger a pyrofuse to isolate the inverter fast, limiting short-circuit damage and fault spread.

Fixed-frequency SRC isolation with partial-power buck-boost regulation handles wide battery voltages with lower complexity and transformer size.

Controllable switches form a discharge loop that grounds boost-circuit common-mode voltage after shutdown to meet safe discharge limits.

Dynamic NRHPZ buck-boost conversion tracks rapid RF envelope changes to improve amplifier efficiency and reduce data transfer errors.

Integrated DC choppers in MMC cells discharge capacitors on demand, handling faults and over-voltage without constant bleed losses.

A split inductor and crowbar thyristor limit fault discharge currents in converter submodules, enabling higher energy storage with lower destruction risk.

A feedback compensation loop corrects current measurement errors to eliminate neutral line offset current and stabilize coupling capacitor voltage.

Soft timer synchronization and interlaced PWM timing smooth power outtake, cutting capacitor voltage variation and DC-link ripple.

Temperature-based gate-emitter capacitance adjustment cuts IGBT switching loss at high temperature without raising radiation noise.

A small pull-down precharge aligns flying-capacitor terminal voltages with output voltage before switching, preventing damaging SCC current surges.

Alpha-beta transforms across multiple reference frames distinguish open and short switch faults and pinpoint the failed switch in multiphase converters.

A bridge and switching circuit create a controlled discharge loop that grounds boost-circuit common mode voltage within safe limits after shutdown.

Adaptive switching between 2-level and 3-level modes cuts converter losses and EMI while allowing higher-RDSON middle switches to lower cost.

A converter-level modular energy store uses supercapacitors or accumulators to bridge voltage dips, maintain torque, and avoid drive shutdowns.

Unequal capacitor charging redistributes switch voltage stress in multilevel converters to balance thermal load and extend converter lifetime.

Using the converter’s main power path and a saturating protection inductor, this case limits startup inrush current without pre-charge resistor losses.

Input-side power measurement and loss balancing verify electrosurgical RF output while reducing systematic error, cost, and leakage current.

Single-phase interval control cuts switching cycles in multi-phase converters while keeping power factor correction and harmonic compliance.

By switching only one NPC inverter unit outside near-zero current, this control cuts switching loss and improves harmonic quality.

Input-side inverter power is compared with direct RF output measurement to verify electrosurgical generator power while reducing sensor cost and leakage current.

A shared gate-driver signal path uses timed communication windows to decode settings while limiting shoot-through risk and extra wiring.

By switching only one unit at high frequency outside a near-zero current band, this NPC inverter cuts switching loss and improves harmonic quality.

Offset-wave voltage control switches phase amplitudes at high modulation to suppress harmonics, noise, and motor torque unevenness.

Delayed sampling after switch events avoids electrical noise in power converters, improving parameter accuracy for stable feedback control.

Rectification, DC bus storage, and feedback-controlled conversion deliver stable AC or DC output across varying regional voltages and frequencies.

Blending DPWM and MPC common-mode injection cuts DC bus capacitor ripple current and switching loss across changing inverter conditions.

Clock frequency modulation sends auxiliary information through the isolated power path, cutting extra components, PCB space, and EMC issues.

A time-based controller adjusts clock duty cycle to balance flying capacitor voltage, cutting transistor stress and ripple currents.

A DC connecting bus decouples input fluctuations to deliver stable AC or DC output across regional voltage and frequency differences.

Dynamic mode switching and feedback keep the flying capacitor near ½Vin, stabilizing three-level Buck converter operation under input and load changes.

Threshold-based control adjusts converter cell positive-voltage timing by current direction to keep MMC capacitor voltages balanced and avoid shutdown.

A pre-detection circuit briefly pulses the low-side switch during unsafe PWM transitions to prevent latch-up in multi-phase DC-DC converters.

Switching the DC conversion unit from MPPT to bus constant mode helps a photovoltaic inverter track load power faster and avoid DC-AC mismatch.

A single transformer and breaker pre-charge multiple DC link capacitors, limiting grid connection current spikes while cutting converter cost and complexity.

Separating grid current and voltage harmonics lets an electrical converter keep pulse pattern control while reducing current THD and improving output voltage quality.

Alternating charge-discharge between two batteries and a bridge arm generates direct self-heating with lower loss and less heating hardware.