A Novel Primary-Side Control Converter on Three-Phase Wireless Power Transfer System

This article proposes a novel primary-side control dc/ac converter, called a three-phase integrated boost multilevel converter (TP-IBMC), along with a new modulation scheme, called a three-phase two-state digitized modulation. The voltage buck and boost functionality and the use of low-voltage switches are the prominent advantages of the TP-IBMC. Importantly, the proposed control scheme can generate a square waveform voltage with adjustable amplitude to regulate the power solely using the primary side TP-IBMC, and without changing the pulse width, which enables the achievement of the zero-voltage switching (ZVS). The modular design accelerates manufacturing and enhances flexibility by enabling adjustable submodule counts to meet various specifications. A detailed mathematical model of the proposed converter and control is presented to explain the intrinsic principles. An optimized voltage balancing algorithm shows that the execution time remains within a switching period. Details of a SAE J2954 WPT-3 compliant prototype are presented to demonstrate that it can regulate power transfer at 11 kW under a 220% variation in coupling factor (i.e., 0.15–0.33) and a 136% variation in battery voltage (i.e., 280–380 V). The proposed system maintains ZVS under these conditions, allowing it to achieve an efficiency of 90.5–92%.