Evaluation of the Efficiency of Wireless Power Transfer (WPT) Systems


Transmitting power at a higher voltage can reduce power losses in transmission. WPT output voltage tends to be higher. Measuring this efficiency requires a high voltage measurement. Also, since WPT transfers power through coils, the transmit/receive part has a very low power factor. When the power factor is low, the phase error greatly affects the measured value, so power measurement with a low phase error is essential.


  • (Measurement Example) Efficiency Measurement of WPT

The VT1005 can be used with a power analyzer PW8001 to measure the efficiency of inverters that use SiC power devices.

High-Voltage Measurements

The VT1005 allows power analyzers to measure voltages of up to 5000 V.

Measurement Category

  • 5000 V rms (±7100 Vpeak) No measurement category
  • 2000 V rms CAT II
  • 1500 V rms CAT III

Measurement of High-Frequency Components

The VT1005’s measurement band is DC to 4 MHz, allowing it to measure voltage from DC to high frequencies.In addition, the excellent flatness of the amplitude and phase characteristics in the measurement band enables highly accurate power measurement.

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