A matrix-Z-source converter for automotive integrated starter alternator system

Using matrix converter theories and Z-source conversion concepts, a new converter is proposed in this paper for the automotive integrated starter/alternator (ISA) 42 V system. The problem imposed by the traditional VSI inverter, to develop the relatively high DC voltage from the relatively low AC voltages of AC machine in 42 V ISA system, has been addressed in this paper. The proposed converter achieved boost mode DC-AC inversion and buck mode AC-DC rectification, hence allowing the peak voltage of the AC motor to exceed the 42 V DC bus voltage substantially. In the rectification mode, it can achieve the regulated output DC voltage with VWF AC source without extra close-loop control. The paper investigates the quadrant operation of the converter, its control, its steady-state performance, and experimental verification.