Heat pump device, heat pump system, and method for controlling three-phase inverter

摘要

A selection unit switches between a phase θp and a phase θn different from the phase θp substantially by 180 degrees, and outputs one of them in synchronization with a carrier signal. A voltage-command generation unit generates and outputs three-phase voltage command values Vu*, Vv* and Vw* based on the phase outputted by the selection unit. A PWM-signal generation unit generates three-phase voltage command values Vu*′, Vv*′ and Vw*′ by correcting the three-phase voltage command values Vu*, Vv* and Vw* outputted by the voltage-command generation unit according to a predetermined method, and generates six drive signals corresponding to switching elements of the inverter based on the three-phase voltage command values Vu*′, Vv*′ and Vw*′ and the carrier signal. The PWM-signal generation unit outputs the generated drive signals to the corresponding switching elements of the three-phase inverter, to cause the inverter to generate a high-frequency AC voltage.

主权项

1. A heat pump device comprising:
a compressor that compresses a refrigerant; a motor that actuates the compressor; an inverter that applies a predetermined voltage to the motor; and an inverter controller that controls the inverter, wherein the inverter controller includes:
a phase switching unit that changes and outputs a phase of a voltage command value of the inverter in synchronization with a reference signal having a frequency higher than an operation frequency at the time of a compression operation of the motor;an amplitude output unit that outputs an amplitude of the voltage command value;a voltage-command generator that generates and outputs the voltage command value based on the phase outputted by the phase switching unit and the output amplitude of the amplitude output unit;a voltage-command calculator that corrects the voltage command value so that a DC current flowing in the motor becomes substantially zero; anda drive-signal generator that generates a drive signal of the inverter based on the output of the voltage-command calculator.