A novel multi-functional converter system equipped with input voltage regulation and current ripple suppression

This paper introduces a multi-functional converter system (MFCS) for HEVs, equipped with input voltage regulation and current ripple suppression. The MFCS consists of a motor, an inverter and a battery, and the battery connected to the neutral point of the motor. However, the basic type MFCS circuit have the advantage of omitting the DC/DC converter, it still needs an external inductor, or large current ripple arises, it causes loss, acoustic noise and vibration, and also has limitations in input voltage regulation range. To improve the MFCS, the two-motor type MFCS is proposed, the battery connected between the neutral points of two three-phase motors. When the two inverters are cooperated, the current ripple suppressed into 1/4.5 of the basic type. And it realizes wider input voltage regulation range than that of the basic type.