{
  "$type": "site.standard.document",
  "description": "An object is to prevent a motor and an inverter from being damaged due to the flow of a large current when a compressor is heated by supplying a high-frequency AC voltage to the compressor. The heat pump device includes an inverter control unit outputting PWM signals to an inverter 9; a current…",
  "path": "/patents/971727",
  "publishedAt": "2014-08-06T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60H1/143",
    "MITSUBISHI ELECTRIC CORP [JP]"
  ],
  "textContent": "An object is to prevent a motor and an inverter from being damaged due to the flow of a large current when a compressor is heated by supplying a high-frequency AC voltage to the compressor. The heat pump device includes an inverter control unit outputting PWM signals to an inverter 9; a current detection unit 20 detecting a current value flowing in the inverter 9 and outputting the current value after reducing a current value having a first frequency or higher in detected current value; and a drive-signal stop unit 41, 42 that, when the current value output from the current detection unit 20 is equal to or larger than an interruption level, stops output of PWM signals to the inverter 9. Particularly, the inverter control unit generates a voltage command value such that the voltage command value becomes a value equal to or larger than a lower limit determined according to the first frequency and generates PWM signals based on generated voltage command value and a carrier signal, thereby causing a voltage output time to the motor to be a predetermined time or longer.",
  "title": "HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AND INVERTER CONTROL METHOD"
}