A tuner and rectifier circuit for wireless power transfer receiver, comprising: - a receiver resonant tank comprising a receiving coil (L Rx) linked by magnetic flux generated by an external transmitting coil, and one or more capacitive elements (C Rx), wherein the receiving coil (L Rx) and the one or more capacitive elements (C Rx) are all connected in parallel; and - a bridgeless tuner and rectifier circuit, comprising: (a) an inductor (L DC) configured to process electrical energy and coupled between a first switching network (S C1, Sc2) and a second switching network (S D1, S D2); (b) the first switching network (S C1, S C2) being configured to exchange energy between the receiver resonant tank and the inductor (L DC), and the second switching network (S D1, S D2) being configured to exchange energy between the inductor (L DC) and an energy buffer network; (c) the energy buffer network comprising one or more energy storage elements (C buff, C buff1, C buff2), to supply a load coupled to terminals of the energy buffer network; and (d) a switch controlling circuit to control the first switching network (S C1, S C2) and the second switching network (S D1, S D2); characterized in that the inductor (L DC) is one single inductor (L DC) and the switch controlling circuit is configured to: (i) adaptively delay the switching of the first switching network (S C1, S C2) for an adaptive time-delay that is synchronized with the start of either a positive cycle or negative cycle of the receiver resonant tank voltage to synthesize a variable reactive inductance; (ii) then activate the first switching network (S C1, S C2) to couple the receiver resonant tank to the single inductor (L DC); and (iii) then activate the second switching network (S D1, S D2) to couple the single inductor (L DC) to the energy buffer network, whereby the adaptive time-delay and the activation of the first and second switching networks (S C1, S C2; S D1, S D2) carries out adaptive tuning of the receiver resonant circuit as well as energy rectification using the one and the same single inductor (L DC). - a receiver resonant tank comprising a receiving coil (L Rx) linked by magnetic flux generated by an external transmitting coil, and one or more capacitive elements (C Rx), wherein the receiving coil (L Rx) and the one or more capacitive elements (C Rx) are all connected in parallel; and - a bridgeless tuner and rectifier circuit, comprising: (a) an inductor (L DC) configured to process electrical energy and coupled between a first switching network (S C1, Sc2) and a second switching network (S D1, S D2); (b) the first switching network (S C1, S C2) being configured to exchange energy between the receiver resonant tank and the inductor (L DC), and the second switching network (S D1, S D2) being configured to exchange energy between the inductor (L DC) and an energy buffer network; (c) the energy buffer network comprising one or more energy storage elements (C buff, C buff1, C buff2), to supply a load coupled to terminals of the energy buffer network; and (d) a switch controlling circuit to control the first switching network (S C1, S C2) and the second switching network (S D1, S D2); (a) an inductor (L DC) configured to process electrical energy and coupled between a first switching network (S C1, Sc2) and a second switching network (S D1, S D2); (b) the first switching network (S C1, S C2) being configured to exchange energy between the receiver resonant tank and the inductor (L DC), and the second switching network (S D1, S D2) being configured to exchange energy between the inductor (L DC) and an energy buffer network; (c) the energy buffer network comprising one or more energy storage elements (C buff, C buff1, C buff2), to supply a load coupled to terminals of the energy buffer network; and (d) a switch controlling circuit to control the first switching network (S C1, S C2) and the second switching network (S D1, S D2); (i) adaptively delay the switching of the first switching network (S C1, S C2) for an adaptive time-delay that is synchronized with the start of either a positive cycle or negative cycle of the receiver resonant tank voltage to synthesize a variable reactive inductance; (ii) then activate the first switching network (S C1, S C2) to couple the receiver resonant tank to the single inductor (L DC); and (iii) then activate the second switching network (S D1, S D2) to couple the single inductor (L DC) to the energy buffer network,