Based on the principle of temporal interference (TI), two transmitting coils with a slight frequency difference generate a superposition of magnetic fields on the receiving coil and then induce a low-frequency electrical signal on it. It also improves the problem that changes in the receiving coil’s position affect the transmission power’s stability. A more uniform and stable magnetic field was obtained through structural improvements. Compared to conventional WPT systems, this paper uses Helmholtz coils with a centrosymmetric structure as the transmitting coils. This paper proposes a novel temporally interfering wireless power transfer (WPT) system, based on Helmholtz coils, to address energy depletion and the miniaturization of wireless power transfer systems for implantable devices. Electrical nerve stimulation (ENS) is clinically important in treating neurological diseases.
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