Power Conversion Systems TRIZ Cases

A parallel current path diverts low-frequency current from the common-mode coil to prevent saturation and preserve high-frequency noise suppression.

Closed-loop boost PFC uses current sensing and a start-up diode to cut harmonics, improve power factor, and ease stress in current-source LED lighting.

Comparator-driven body bias control corrects PAM4 level mismatches, improving impedance matching and reducing receiver distortion.

Minor and major error circuits let a management controller isolate faulty sub-control boards by cutting power, improving distributed control stability.

Multiple voltage feedback paths around the ORing stage help detect over-voltage, under-voltage, and faults while keeping the common bus stable.

Multi-level third-gate voltage control cuts IGBT turn-on and conduction loss while preventing parasitic-capacitance ignition.

A protective circuit monitors discharge voltage and turns off the switch below a threshold to prevent sustained heating damage.

Pulse-width decoding lets power ICs send data and clock over one pin, easing pin-count limits while maintaining reliable communication.

A coupled-inductor LLC converter integrates PFC without extra switches, cutting THD while maintaining high power factor and bus voltage stability.

Multiple sense transistors and feedback voltage matching measure power transistor current accurately without series resistor losses or heat.

Monitoring voltage, current, and temperature lets a microprocessor predict circuit wear and trigger protection before power supply damage.

A compensation coil in the integrator replicates coupling-capacitor parasitics, improving common-mode EMI attenuation above 100 kHz.

A precharged capacitor enables autonomous output discharge after power-off, cutting standby loss and extra comparator circuitry.

Automatic metric extraction and optimization tune power converter compensation parameters faster than manual tuning while improving reliability.

A dual-memory controller tests control parameters in MTP memory and commits only validated settings to OTP, avoiding ECO-driven rework.

Closed-loop sensing of mains voltage, output voltage, and resonant current enables isolated PFC with sinusoidal input current at higher power.

A control circuit switches capacitor paths to keep return current above a threshold, avoiding false power cutoff and wasted power.

A microcontroller, optocoupler, and constant current driver switch an AC solid-state relay at zero crossing to cut EMI and surge damage.

A shared control pin and variable resistance circuit detect blocking-switch output voltage while reducing pin count and speeding discharge.

Burst-mode PFC control limits switching at low input current, cutting driving loss while keeping output voltage stable under light load.

Charging current is adjusted to pulse repetition rate so energy storage stays ready between pulses while reducing battery degradation.

A feedforward control path detects high dV/dt bus voltage events early, protects the converter from over-current, and supports safe restart.

Switchable voltage, PWM, and hybrid outputs improve dimming smoothness while reducing flicker, noise, and color synchronization issues.

Matching output power parameters across conversion modules cuts multi-stage conversion losses and improves output device efficiency.

Auto-adjustable discharge at the compensation node speeds LED load transitions while limiting overshoot and converter oscillation.

Interconnected reactor-capacitor filter nodes balance parallel output currents in contactless power supply circuits and cut power loss.

Selective switching keeps the on/off controller available while disconnecting power stages to cut standby energy use.

A hysteresis-based feedback path switches to an ultra-light load value to cut voltage converter power dissipation while maintaining output control.

Separate power lines, RC damping, and an interline noise filter curb cross-circuit supply noise and keep electronic operation stable.

A resistor-sensed voltage divider with bypass switches lets an SMPS switch between nominal and boost current limits without complex control.

Adding an offset voltage in a PFC control circuit suppresses AC input THD, improves load response, and avoids larger capacitor and resistor values.

Dynamic PFC frequency control raises switching frequency at peak load to prevent inductor saturation without enlarging the choke.

A microcontroller switches LED driver and PFC modes by brightness threshold to prevent flicker and support dimming down to 0.5%.

A temperature-triggered secondary load helps low-power LED lamps start electronic transformers in cold conditions without affecting brightness.

Coordinated EES charging and switching timing equalizes voltage across series-connected semiconductor switches during transients.

Passive energy-storage and resistive balancing circuits limit transient voltage mismatch across series-connected switching devices without active feedback.

Variable power limits by operating point let the converter protect current and power constraints without shrinking its usable range.

A switched mains filter isolates charged capacitors when unplugged, cutting standby loss while maintaining appliance EMI compliance.

A thicker field insulating film at the trench gate pull-up suppresses electric field concentration and prevents gate oxide breakdown during high dV/dt switching.

A ripple reduction circuit injects counter-current in a triangular-mode PFC converter to cut input EMI and shrink filter size.

Gradually rising reference and protection thresholds smooth DC-DC startup current and prevent prolonged peak-current stress on chips and inductors.

Monitored voltage-drop timing lets the driver adjust gate current to control slew rate, cutting EMI noise and power loss.

A predictive active EMI filter uses PFC switch timing to inject compensation current early, suppressing differential noise without sensing delay.

A tuned choke, capacitance multiplication, and a chassis inductor cut common-mode EMI while reducing filter size, cost, and safety risk.

A dual-target control loop enables pulsed LED dimming without interrupting power flow, reducing flicker, color drift, and low-level instability.

Adaptive PFC feedback speeds up during DALI bus activity to limit DC link voltage dips, stabilizing light output without worsening THD.

Dynamic transistor on-time control shapes peak inductor current to follow rectified voltage, improving power factor in AC power supplies.

Blocks gate pulses during forward-reverse transitions so one power module fully recovers before the other turns on, preventing shoot-through faults.

A two-stage switch power supply employs a voltage limiting delay module to prevent intermittent operation caused by low first-stage output voltage.

An active filter generates a compensating current to cancel harmonic components in power systems.

A power management chip starting circuit uses a voltage detection circuit to control a switch that disconnects an external resistor from the starting capacitor.