Heat pump device

Patent metadata

Field	Value
Publication number	US-10928112-B2
Application number	US-201616088044-A
Country	US
Kind code	B2
Filing date	Sep 2, 2016
Priority date	Mar 25, 2016
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A heat pump device is equipped with a compressor for compressing a refrigerant; a converter for converting a voltage of an alternating current power supply into a boosted direct current; an inverter for converting the direct current output of the converter into an alternating current, supplying the alternating current to the compressor; a voltage detector for detecting an input voltage to the converter; a stop controller for stopping operation of the converter and the inverter when resonance occurs in the voltage detected by the voltage detector; a limit controller for sending an instruction to limit an input current to the converter so as to avoid the resonance; and a manually operable input interface for sending an instruction to cause the limit control unit to operate.

First claim

The invention claimed is:

1. A heat pump device comprising:
a compressor configured to compress a refrigerant;
a converter configured to convert a voltage of an alternating current power supply into a direct current voltage boosted by switching;
an inverter configured to convert the direct current output of the converter into an alternating current power supply and supply the alternating current power supply to the compressor;
a voltage detector configured to detect an input voltage of the converter;
a stop controller configured to stop operation of the converter and the inverter in response to resonance occurring in the input voltage being detected by the voltage detector;
a limitation controller configured to send an instruction to limit an input current to the converter in such a manner that resonance is avoided; and
an input interface configured to be manually operable and input an operational instruction to operate the limitation controller.

2. The heat pump device according to claim 1 , wherein the input interface is at least one of:
a remote controller of the heat pump device that is equipped with plural buttons and is configured to input the operational instruction to the limitation controller when a special operation is performed on the plural buttons, and
a changeover switch that is provided in a controller of the heat pump device, the changeover switch having a first switching state and a second switching state and being configured so that the operation instruction is input to the limit control unit in response to the changeover switch being placed in the first switching state and the operation instruction is prevented from being input to the limit control unit in response to the changeover switch being placed in the second switching state.

3. The heat pump device according to claim 1 , further comprising an operation prohibition controller configured to stop re-operation of the converter and the inverter until receiving the operational instruction, after the stop controller stops operation of the converter and the inverter.

4. The heat pump device according to claim 1 , further comprising an inverter controller configured to control an output frequency so that an input current of the inverter does not exceed a predetermined value when receiving the instruction to limit the input current to the converter and limit the input current to the converter in such a manner that resonance is avoided.

5. The heat pump device according to claim 2 , further comprising an operation prohibition controller configured to stop re-operation of the converter and the inverter until receiving the operational instruction, after the stop controller stops operation of the converter and the inverter.

6. The heat pump device according to claim 2 , further comprising an inverter controller configured to control an output frequency so that an input current of the inverter does not exceed a predetermined value when receiving the instruction to limit the input current to the converter and limit the input current to the converter in such a manner that resonance is avoided.

7. The heat pump device according to claim 3 , further comprising an inverter controller configured to control an output frequency so that an input current of the inverter does not exceed a predetermined value when receiving the instruction to limit the input current to the converter and limit the input current to the converter in such a manner that resonance is avoided.

Assignees

• Toshiba Carrier Corp

Inventors

• Yamamoto Kenta
• Katoh Yuji
• Kanamori Masaki

Classifications

• H02M7/48 Primary

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title

• H02M1/4225

  using a non-isolated boost converter · CPC title

• F25B49/02 Primary

  for compression type machines, plants or systems · CPC title

• F25B49/025

  Motor control arrangements · CPC title

• H02M1/0025

  Arrangements for modifying reference values, feedback values or error values in the control loop of a converter · CPC title