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This paper proposes a series of new control methods for single-phase Z-source inverters. A detailed description of the concept and principle of each method is first presented, then a comparison among them is conducted comprehensively. Afterwards, an optimized closed-loop control scheme with better harmonic elimination performance is derived. Experimental results obtained from a 1kW un-isolated Zsource inverter prototype have demonstrated the effectiveness of the proposed control method. Compared to the conventional boost control, the proposed scheme has better performance with reduced harmonics, more flexible voltage gain, and simple algorithm. INDEX TERMS Z-source inverters, shoot-through states, closed-loop control, harmonics suppression, voltage boosting.

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Wireless power transfer technology has been a research and industrial hotspot with applications in many areas, such as wireless electric vehicle charging system which requires high power, high efficiency and high power factor. Usually, the power is drawn from 50/60 Hz single-phase or three-phase AC power source. For a high power application, a three-phase AC source is commonly used. In this paper, a three-phase single-stage wireless-power-transfer resonant converter with power factor correction and bus voltage control is proposed to improve efficiency and power quality of three-phase input, and reduce production cost and complexity for high power wireless-power-transfer system. A T-type topology is applied as the common part to perform both the power-factor-correction and DC-DC wireless-power-transfer functionalities simultaneously. The proposed converter is much more advantageous than conventional three-phase two-stage wireless-power-transfer converter with individual power factor corrector. Besides, three-phase single-stage topologies have better power quality than single-phase single-stage topologies because zero-sequence components can be naturally eliminated. Index Terms-wirelesspower transfer, three-phase, single-stage, power factor correction I. INTRODUCTION IRELESS Power Transfer (WPT) is taking up more and more roles in the industrial community. WPT technology has a variety of applications with power levels ranged from several milliwatts to tens of kilowatts, including charging portable telephone [1], supplying power for biomedical implants [2] -[4], electric vehicle (EVs) battery charging [5], [6], and roadway powering moving EVs [7], [8]. Compared to conventional wired power transmission, WPT technology is Manuscript

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