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AC-AC power transfer efficiency of wireless power coil

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bhl777

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Hi All, I have a WPT system, where the Tx coil is driven by a class E power amplifier. PTE.png
To analysis dc-dc power transfer efficiency (PTE), we can measure the dc current I1 and I2 at the VDD and the rectified voltage to calculate the input and output power. However, I also see people calculating ac-ac power transfer efficiency. Would anyone teach me what current and voltages will we need to measure to calculate the ac-ac PTE of this WPT system?
Thank you!
 

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