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

摘要

The purpose of the present invention is to achieve efficient heating of coolant accumulated in a compressor. A phase switching unit (19) switches between phase (?1) and phase (?2), which is different from phase (?1) by approximately 180°, in synchronisation with a carrier signal and delivers output. An adder (20) adds a phase (?plus) of n times 60° to the phase that is output by the phase switching unit (19) and outputs the result as a voltage instruction phase (?). A high-frequency AC voltage generating unit (13) generates and outputs three-phase voltage instruction values (Vu*, Vv*, Vw*) on the basis of the voltage instruction phase that is output by the adder (20). A PWM signal generating unit (17) generates six drive signals corresponding to switching elements (18a to 18f) of an inverter (9), by comparing the carrier signal with the three-phase voltage instruction values (Vu*, Vv*, Vw*) that are output by the high-frequency AC voltage generating unit (13), and causes the inverter (9) to generate high-frequency AC voltage by outputting the generated drive signals to the corresponding switching elements of the three-phase inverter.