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

摘要

An object of the present invention is to heat a refrigerant accumulated in a compressor efficiently. A phase switching unit 19 switches a phase ¸1 and a phase ¸2 different from the phase ¸1 substantially by 180 degrees and outputs the phase, synchronously with a carrier signal. An adder 20 adds a phase ¸plus, which is n times a size of 60 degrees, to the phase output from the phase switching unit 19 and outputs the phase as a voltage command phase ¸. A high-frequency AC voltage generation unit 13 generates three-phase voltage command values Vu*, Vv*, and Vw* based on the voltage command phase output by the adder 20 and outputs these command values. A PWM-signal generation unit 17 compares the three-phase voltage command values Vu*, Vv*, and Vw* output from the high-frequency AC-voltage generation unit 13 with the carrier signal to generate six drive signals corresponding to respective switching elements 18a to 18f of an inverter 9, and outputs respective generated drive signals to the corresponding switching elements of the three-phase inverter, and generates a high-frequency AC voltage in the inverter 9.