An Integrated Power Converter-Based Brushless DC Motor Drive System

In this article, an integrated power converter with dc bus voltage boosting capability is proposed for driving the brushless dc motors. In the topology, a bidirectional buck/boost dc–dc (BBD) converter can be integrated with the three-phase voltage-source inverter (TVSI) through a common three-switch leg. As compared with the traditional TVSI with a front-end BBD converter (TVSI-BBD), one power switch and its associate driving circuits in the BBD converter part can be saved. Thus, the integrated power converter has the benefits of reducing the converter size, lowering system costs, and enhancing power density. To decouple the dc bus voltage boosting control and the speed closed-loop control, a field-oriented control algorithm with space vector pulsewidth modulation technique is also proposed. The feasibility of the driving system is evaluated through systematic analysis and validated experimentally on a developed motor drive system prototype.