An integrated five-output single-inductor multiple-output dc-dc converter with ordered power-distributive control (OPDC) in a 0.5 m Bi-CMOS process is presented. The converter has four main positive boost outputs programmable from +5 V to +12 V and one dependent negative output ranged from 12 V to 5 V. A maximum efficiency of 80.8% is achieved at a total output power of 450 mW, with a switching frequency of 700 kHz. The performance of the converter as a commercial product is successfully verified with a new control method and proposed circuits, including a full-waveform inductor-current sensing circuit, a variation-free frequency generator, and an in-rush-current-free soft-start method. With simplicity, flexibility, and reliability, the design enables shorter time-to-market in future extensions with more outputs and different operation requirements.
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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