Efficiency and damping control evaluation of a matrix converter with a boost-up AC chopper in adjustable speed drive system

This paper evaluates the damping control for a matrix converter (MC) configuration with a boost-up AC chopper and the efficiency characteristics. This circuit configuration can improve the voltage transfer ratio, but the losses are increased due to the additional AC chopper. On the other hand, as a motor is driven at high rotating speed region, the flux-weakening control is necessary for general MCs. However, the copper loss is increased due to the flux-weakening control when an IPMSM is used. Therefore, the validity of the proposed circuit is evaluated in IPMSM adjustable speed drive system in term of efficiency. In addition, the proposed circuit is demonstrated by 3.7-kW prototype in simulation and experiments. As a result, it is revealed that the efficiency of the proposed system is higher when the motor rated voltage is over 107% of the input voltage.