Abstract
Wireless charger for Electric Vehicles (EVs) is an off-line application and it needs power factor correction (PFC) function, which usually consists of a front-end boost PFC and a cascaded DC/DC converter. Recently, Z-source resonant converter (ZSRC), a single-stage solution with low cost and high efficiency, was proposed for EV wireless charger. Combining with the Z-source network, the control scheme is more challenged and sophisticated. Traditional phase-shift control can generate arbitrary combination of shoot-through state and active state over one fundamental cycle. However, ZSRC enters discontinuous mode at light loads, and huge current distortion and voltage stress are observed with phase-shift control. This paper presents a PFC control method specific for ZSRC in discontinuous mode. It can pass IEC61000-3-2 Class A criterion with all the double line frequency power absorbed in the Z-source network. Experimental results based on a 1-kW prototype with 20-cm air gap between the primary and secondary side are presented to illustrate the proposed control scheme.
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