Adaptive NFC WPT System Implementing Neural Network-Based Impedance Matching with Bypass Functionality

RF-DC conversion circuit using quadrature hybrid for complex maximum power point tracking

“…For RF-based technology, the use of mechanical variable reactances [3] ,switching of reactance bank [3][4][5][6][7][8][9][10][11] and mechanical control of inductance [12] improves high-power handling but limits the upper frequency limit and size. Additionally, a varactor diode [13,14] , voltage variable capacitor [15][16][17], or negative impedance circuit [18] is widely used owing to its high-frequency capability, small size, and full electric control, but has poor high-power handling. For power-electronics-based technology, an active reactance circuit [19][20][21][22][23][24][25][26] or active rectifier [27][28][29][30][31] is used for power factor compensation, which has superior high-power handling, but a lower frequency limit.…”