Patent ID: 9322587
Filing Date: 2016-04-26
CPC Classification: F04B,F04C,F25B,H02M,Y02B

Claim Text:
1. A heat pump device comprising: a compressor including a compression mechanism configured to compress a refrigerant and a motor configured to drive the compression mechanism; heat exchangers; an inverter configured to apply a desired voltage to the motor; and an inverter control unit configured to generate Pulse Width Modulation (PWM) signals for driving the inverter, wherein the inverter control unit includes: the heating time carrier signal is generated to form a combined cycle in which the predetermined frequencies are arranged in a predetermined order by cyclically switching each of the predetermined frequencies at each one cycle and repeat the switching in the combined period for each combined period, and a combined frequency, which is a frequency corresponding to the combined cycle, is set to a frequency equal to or lower than 20 hertz.