Measurement Using Dc-Ac Conversion TRIZ Cases

Current sampling and chopper amplification detect small terminal currents accurately across wide voltage ranges without resistor loss.

Dynamic reference adjustment compensates SMPS zero-crossing delay and PVT variation to improve power switch timing accuracy.

A shared common-mode and differential-mode core measures inverter bus currents while limiting parasitic current, EMI, mass, and bus length.

A ribbon-based flexible magnetic core and bias-frequency filtering enable accurate non-contact measurement of low AC currents in tight spaces.

Two series current sensors and a shunt capacitor separate average and instantaneous current sensing to cut losses and improve resolution in switched-mode converters.

A capacitor charged by insulator leakage current triggers RFID-style radio transmission, enabling low-cost monitoring without external power.

Cycle-average current magnitude and angle checks detect 3-phase inverter sensor faults before bad compensation causes steering noise or unsafe current.

Switchable chip selection and demagnetizing circuits let a current transformer detect current in both directions while maintaining sampling accuracy.

An AC-coupled magnetic core detects DC leakage without core magnetization, preserving shutoff precision in photovoltaic power supplies.

Converts internal voltage signals into current signals to reconstruct waveforms during wafer testing with low loading and less distortion.

Internal IC signals are monitored by converting voltage amplitude and timing into current signals, enabling accurate wafer acceptance testing.

Integrated sampling, delay, and time-to-current circuits capture internal IC signals during wafer testing with minimal loading.

An FPGA with 1-bit sigma-delta conversion replaces DSP control in a fluxgate current transducer, cutting complexity while preserving precise, stable sensing.

A tunable transconductance amplifier generates calibration current to offset PMU routing resistance in real time, improving accuracy and channel density.

A control circuit resets the integration stage after abnormal input saturation, speeding offset correction recovery in chopper amplifiers.

A square-wave intermediary lets current sensing across a sense resistor use lower-voltage transistors, cutting sensor size and cost.

Alternating reference and input voltages through one path lets both share the same offset, reducing process-variation error in signal detection.

Hall sensor feed-forward and magnetic modulation help a DC current transformer avoid core saturation and recover quickly from false balance.

Silence-based attenuation with high-pass envelope detection suppresses Bluetooth and WLAN hum and clicks in FM receiver audio.

A multiplier-based RF power detector senses weak signals without preamplification, cutting current use and circuit size in AGC paths.

Dynamic thresholds and TDC sampling capture PMT pulse leading edges for precise timestamps and energy measurement in PET imaging.

Internal positive feedback and current-mirror loads add Hall sensor hysteresis while cutting die size, power use, and supply drift.

Scalar ISR and CSR measurements from a spectrum analyzer calibrate gain imbalance, phase skew, and channel offsets with less complexity and time.

Separate scaling, isolation, and per-channel ADCs cut transformer cross-talk, non-linearity, weight, and sampling skew in power transmission.

FM-based isolation and redundant diagnostics verify voltage absence accurately while reducing worker exposure to energized circuits.

A battery-powered coil generates high-frequency AC magnetic fields to inspect sensor devices without external wiring, cutting size and weight.

An isolation circuit and FM mixer verify voltage absence without direct testing on energized electrical equipment.

This case combines split-winding excitation, PWM control, redundant channels, and degaussing for reliable fluxgate current sensing.

A current estimation circuit calculates inductor current using capacitor voltage changes and control logic.