Clothing treatment apparatus and control method therefor

Patent metadata

Field	Value
Publication number	US-11535975-B2
Application number	US-201917053002-A
Country	US
Kind code	B2
Filing date	May 3, 2019
Priority date	May 4, 2018
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A clothing treatment apparatus includes a plurality of inverters for controlling the motors of a drum, a compressor, and a blowing fan, a converter for converting input power input from an external source and outputting the converted power to the inverters, and a control unit for controlling the plurality of inverters and the converter.

First claim

What is claimed is:

1. A clothing treatment apparatus, comprising:
a main body that defines an external appearance of the clothing treatment apparatus;
a drum rotatably disposed inside the main body and configured to accommodate an object to be dried by heated air;
a compressor configured to compress refrigerant to exchange heat with dehumidified air circulated through a condenser to the drum, wherein the dehumidified air has less moisture relative to the heated air;
a blower fan configured to generate a flow of the heated air or the dehumidified air;
a plurality of inverters configured to transfer power to at least one of the drum, the compressor, or the blower fan;
a converter configured to receive input power from an outside, convert the received input power, and output the converted input power to the plurality of inverters; and
a control unit configured to generate command information corresponding to each of the plurality of inverters and to control the converter based on the generated command information.

2. The clothing treatment apparatus of claim 1 , further comprising a first motor configured to rotate the drum, a second motor configured to rotate the blower fan, and a third motor configured to drive the compressor,
wherein the plurality of inverters comprise:
a first inverter configured to transfer power to the first motor,
a second inverter configured to transfer power to the second motor, and
a third inverter configured to transfer power to the third motor.

3. The clothing treatment apparatus of claim 2 , wherein the control unit is configured to:
generate a first switching signal for controlling the first inverter, a second switching signal for controlling the second inverter, and a third switching signal for controlling the third inverter; and
control operation of the converter based on the first switching signal, the second switching signal, and the third switching signal.

4. The clothing treatment apparatus of claim 2 , wherein the control unit is configured to:
detect a magnitude of load applied to each of the first inverter, the second inverter, and the third inverter; and
control operation of the converter based on the detected magnitude of load applied to each of the first inverter, the second inverter, and the third inverter.

5. The clothing treatment apparatus of claim 2 , further comprising:
an input unit configured to receive a user input for setting an operation mode of the clothing treatment apparatus,
wherein the control unit is configured to control the converter based on the user input.

6. The clothing treatment apparatus of claim 5 , wherein the control unit is configured to control the converter based on an operation time of the clothing treatment apparatus set by the user input.

7. The clothing treatment apparatus of claim 5 , wherein the control unit is configured to control the converter based on a temperature of hot air to be supplied into the drum set by the user input.

8. The clothing treatment apparatus of claim 2 , further comprising:
a sensor configured to sense a weight of the object in the drum,
wherein the control unit is configured to control the converter based on the weight of the object in the drum.

9. The clothing treatment apparatus of claim 2 , wherein the control unit is configured to:
set an output of each of the first inverter, the second inverter, and the third inverter based on a set operation mode of the clothing treatment apparatus; and
control operation of the converter based on the set outputs of the first inverter, the second inverter, and the third inverter.

10. The clothing treatment apparatus of claim 2 , wherein the control unit is configured to:
detect a voltage level of the input power received from the outside; and
distribute the converted input power of the converter based on the detected voltage level of the input power.

11. The clothing treatment apparatus of claim 2 , wherein the converter comprises:
an inductor configured to receive the input power and to transfer energy corresponding to the input power,
a power switch connected to an end of the inductor and configured to control transfer of the energy from the inductor based on a switching signal of the control unit, the power switch being configured to:
allow the transfer of the energy from the inductor to an output end of the power switch during a switching-off operation period according to a duty control signal, and
block the transfer of the energy from the inductor to the output end of the power switch during a switching-on operation period according to the duty control signal,

a diode that is electrically connected in parallel to the power switch and that is connected to the end of the inductor, the diode being configured to allow the transfer of the energy from the inductor to the output end and to block a reverse flow of energy from the output end during the switching-on operation period, and
an output capacitor that is electrically connected in parallel to a load disposed at an end of the diode corresponding to the output end of the power switch, the output capacitor being configured to charge part of the energy transferred through the diode and to output the charged energy to the load during the switching-on operation period.

12. The clothing treatment apparatus of claim 2 , wherein the control unit is configured to receive feedback information related to an output of the converter and to control a switching operation of the converter based on the feedback information.

13. The clothing treatment apparatus of claim 12 , wherein the feedback information comprises information about at least one of an operating frequency or an operating duty ratio of the switching operation of the converter.

14. The clothing treatment apparatus of claim 13 , wherein the control unit is configured to:
compare the operating frequency to a set frequency; and
adjust the switching operation of the converter a difference between the operating frequency and the set frequency.

15. The clothing treatment apparatus of claim 13 , wherein the control unit is configured to:
compare the operating duty ratio to a set duty ratio; and
adjust the switching operation of the converter based on a difference between the operating duty ratio and the set duty ratio.

16. The clothing treatment apparatus of claim 12 , wherein the switching operation comprises a plurality of switching-on periods that are different from one another.

17. The clothing treatment apparatus of claim 11 , further comprising a shunt resister that is disposed between the output capacitor and at least one of the first inverter, the second inverter, or the third inverter.

18. The clothing treatment apparatus of claim 1 , further comprising a heat pump that includes the compressor and the condenser.

19. The clothing treatment apparatus of claim 2 , wherein the first inverter, the second inverter, and the third inverter are electrically connected in parallel to one another.

20. The clothing treatment apparatus of claim 19 , wherein each of the first inverter, the second inverter, and the third inverter comprises three pairs of switches.

Assignees

• Lg Electronics Inc

Inventors

• Jung Hansu
• Kim Jaemin
• Park Sangwoo
• Lee Junho
• Lim Lisuel

Classifications

• D06F2101/00

  User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers · CPC title

• D06F2101/14

  Time settings · CPC title

• D06F2103/48

  of the motor driving the pump · CPC title

• D06F58/20

  General details of domestic laundry dryers  (D06F59/00 takes precedence) · CPC title

• H02P5/74

  controlling two or more AC dynamo-electric motors (H02P5/46, H02P5/60 take precedence) · CPC title