Ac-Dc Conversion Without Reversal TRIZ Cases

Centralizing AC/DC conversion in a power hub cuts converter losses and simplifies low-voltage cabling for building DC loads.

Thyristor startup timing based on input-voltage amplitude suppresses inrush current while avoiding bulky relays and complex phase calculations.

A tuned resonant frequency ratio keeps Class-E rectifier input reactance stable as dc load changes, avoiding extra regulation circuitry.

A selector switches between AC and DC regulation to stabilize generator voltage and limit HVDC overshoot during no-load and load transients.

Direct series coupling of a human-body antenna and rectifier captures radio waves and quasi-electrostatic fields without a matching circuit.

Dynamic overcurrent protection is enabled only after firing time, preventing false triggering in forward phase-control dimming of LED loads.

Real-time fuel and load analysis sheds noncritical facility loads to extend generator runtime during power outages.

Modular switching and regulating stages raise voltage conversion ratio without adding excessive capacitors and switches, improving efficiency.

Multiple output terminals on a Cockcroft-Walton circuit generate different DC potentials from one AC supply, cutting circuit size and complexity.

Voltage and current feedback trim gate pulse width in a quasi-resonant converter to protect the IGBT while sustaining high power output.

Drain-voltage sensing with filtered comparator control turns off the MOSFET before spikes, improving converter efficiency and protection.

A single-piece housing with five bus bar channels improves dielectric clearance, cooling flow, and high-speed connection stability.

LED arrays and photovoltaic cells replace bulky electromagnetic parts to step down AC into compact, cost-effective DC power.

A three-terminal power supply lets the controller run below input voltage, expanding buck converter input and output range with simpler circuitry.

By keeping the DC-bus capacitor uncharged during OFF intervals, this control approach avoids hard-switching, ticking noise, and excess losses.

A state-machine fan controller cuts fan runtime during non-arc periods, reducing noise, dust intake, and fan wear while maintaining cooling.

A dual rectifier and switch-control layout handles different AC inputs on one board, cutting circuit complexity, volume, and hardware cost.

By multiplexing switches, diodes, and resistors, this circuit suppresses startup surge, handles overvoltage, and stabilizes bus capacitor voltage.

A protective capacitor in a power adaptor supplies startup surge current, reducing breaker trips in high-power corded tools.

Quasi-two-level switching cuts neutral-point current in a DNPC PFC circuit, reducing voltage fluctuation, capacitor size, and conduction loss.

Split inductors and bypass diodes suppress negative surge current in a totem-pole bridgeless PFC converter, reducing switch stress.

Staged submodule charging, discharging, and bypass control limits capacitor overcharging and sudden current surges in HVDC converters.

A delayed ripple signal is extracted and subtracted in the control loop to stabilize AC-DC output voltage without larger capacitors.

Two resonant circuits decouple output current control from switching frequency, cutting RFI noise, losses, and control complexity.