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Abstract-A narrow-width power invariant inductive power transfer system (IPTS) along the driving direction is newly proposed in this paper. The conventional I-type power supply rail for on-line electric vehicles (OLEVs) has a very narrow power supply rail with 10cm width and exposes pedestrians to a very low electro-magnetic field due to its alternatively arranged magnetic poles along the driving direction of electric vehicles; however, it has a major drawback: sinusoidal variation of the induced pickup voltage depending on pick-up positions on the power supply rail along driving direction. To overcome this disadvantage, a dqpower supply rail fed by two high frequency AC currents of the dphase and q-phase is introduced in this paper. The d-phase and qphase magnetic poles are alternatively arranged in a line; hence, the induced voltage of a pick-up becomes spatially uniform. The power invariant characteristic of the proposed IPTS for OLEV has been verified by analysis, simulations, and experiments. A practical winding method is suggested, as well.Index Terms-wireless power; IPTS; inductive coupling, dqpower supply rail, on-line electric vehicle R Changbyung Park is with

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A new architecture to improve the SNR of the readout circuit for capacitive TSPs is introduced. The architecture shows better performance in spite of requiring less power consumption and using an integration capacitor that is roughly half in size compared with a previous work. It averages noises by repeated integration and substantially mitigates the effect of display noise through a differential sensing technique. Furthermore, it does not require additional calibration circuitry to correct the settling error by different delay paths because two adjacent lines in differential sensing have almost the same R-C time constant. The circuit is designed in a 0.35 m CMOS technology.