HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AND CONTROL METHOD FOR THREE-PHASE INVERTER IN A HEAT PUMP DEVICE

An object of the present invention is to efficiently heat a refrigerant retained in a compressor. An inverter control unit 12 generates six drive signals corresponding to the respective switching elements 16a to 16f of the inverter 9, and outputs the generated drive signals to the corresponding switching elements 16a to 16f of the inverter 9 to cause the inverter 9 to generate a high-frequency AC voltage. Particularly, the inverter control unit 12 generates a drive signal having a switching pattern A for turning on all the three switching elements 16a-16c or 16d-16f on a positive voltage side or a negative voltage side of the inverter 9, and subsequent thereto, generates a drive signal having a switching pattern B for turning on two switching elements of the three switching elements 16a-16c or 16d-16f and turning off one switching element thereof.