| 摘要 |
<p>To obtain an electric motor driving device and a compressor driving device which are small, lightweight, and cost-effective by providing a capacitor for smoothing a rectified direct-current voltage of an alternating-current power supply whose capacity is reduced to be small, or by not providing the capacitor, and in which an influence due to a direct current voltage pulsation on a direct current load other than the electric motor is reduced. The devices include first rectifying means to which an alternating-current power supply is input, and which rectifies the alternating-current voltage to a direct-current voltage, power conversion means which converts the direct-current voltage rectified by the first rectifying means into an alternating-current voltage and supplies the voltage to an electric motor, second rectifying means to which the alternating-current power supply is input, and which rectifies the alternating-current voltage into a direct-current voltage, and a smoothing capacitor which is provided at a direct current output side of the second rectifying means and which smoothes the rectified direct-current voltage and supplies the voltage to a direct current load.</p> |
