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As the circuit shows, U = 5V toggling the polarity in 10KHz. When IL is changed from less than 1mA to 20mA, the P-P voltage of the Tx coil will increase. How should I understand the phenomenon? I have guessed that the increase of IL will only decrease the voltage on the Rx side.

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  • \$\begingroup\$ You understand it by using a sim tool like micro-cap or LTSpice and modelling it. Quite simply your primary tuned circuit may become more resonant at the expence of the secondary circuit resonance. \$\endgroup\$ – Andy aka May 8 '18 at 10:21
  • \$\begingroup\$ If it helps, see this. \$\endgroup\$ – a concerned citizen May 8 '18 at 10:32
  • \$\begingroup\$ Some operating point is changing, and the resonance or energy storage also changes, affecting the losses. \$\endgroup\$ – analogsystemsrf May 9 '18 at 3:21

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