Loss evaluation of a two-stage boost converter using the neutral point of a motor

This paper evaluates the loss of the proposed two-stage boost converter using the neutral point of a motor, which consists of a small boost chopper and a three-phase inverter. The proposed converter uses the leakage inductance of a motor instead of an ordinary boost-up reactor as a passive boost up component. However, the DC current is imposed to the phase current of the motor in the proposed circuit. Thus the proposed circuit is difficult to separate the power loss between the motor part and the inverter part. The basic operation of the proposed circuit is confirmed by experimental results. In additionally, a measurement method of a power loss in each part of the proposed circuit is established and demonstrated in the test circuit. The efficiency of the boost converter stage of the proposed circuit is increased by 2.3% in compared to the conventional circuit.