Patent ID: 8624538
Filing Date: 2014-01-07
Classification: H02M,H02P

Abstract:
1. A motor driving apparatus for driving a motor by supplying power from an AC power supply, comprising: an AC/DC converter having a converter operation mode which is switched between a PWM converter operation mode in which an AC input voltage is converted into a DC voltage by applying PWM control to a plurality of power switching devices connected in serial and parallel fashion and a diode rectifier operation mode in which an AC input voltage is converted into a DC voltage by using a plurality of diodes each connected in reverse parallel with an associated one of said plurality of power switching devices; a converter control unit which dynamically switches said converter operation mode of said AC/DC converter according to a load during powering operation of said motor; and a load detecting unit for detecting said load, wherein said converter control unit causes said AC/DC converter to operate in said PWM converter operation mode as long as said load detected by said load detecting unit is not greater than a predetermined level, and causes said AC/DC converter to operate in said diode rectifier operation mode when said load has exceeded said predetermined level.