Power converting device and home appliance including the same

Patent metadata

Field	Value
Publication number	US-12301129-B2
Application number	US-202117909245-A
Country	US
Kind code	B2
Filing date	Mar 3, 2021
Priority date	Mar 5, 2020
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

The present disclosure relates to a power converting device and a home appliance including the same. A power converting device according to an embodiment of the present disclosure comprises a first capacitor, a first switching element turned on to output a first voltage stored in the first capacitor to a first node which is one end of an inductive load, a second switching element, one end of which is connected to the first switching element and which is turned on to decrease the voltage of the first node to the first voltage, a third switching element turned on to output a second voltage greater than the first voltage to the first node which is one end of the inductive load, and a fourth switching element, one end of which is connected to the third switching element and which is turned on to decrease the voltage of the first node to the ground voltage. Accordingly, switching loss may be reduced when power is supplied to an inductive load.

First claim

What is claimed is:

1. A power converting device, the device comprising:
a first capacitor;
a first switching element turned on to output a first voltage stored in the first capacitor to a first node which is one end of an inductive load;
a second switching element, one end of which is connected to the first switching element and which is turned on to decrease the voltage of the first node to the first voltage;
a third switching element turned on to output a second voltage greater than the first voltage to the first node which is one end of the inductive load;
a fourth switching element, one end of which is connected to the third switching element and which is turned on to decrease the voltage of the first node to the ground voltage;
a resonant capacitor coupled between the other end of the inductive load and the ground,
wherein in response to the first switching element being turned on during a first period, the voltage of the first node increases to the first voltage by resonance based on the inductive load and the resonant capacitor, and
wherein, in response to the third switching element being turned on during a second period, part of which overlaps the first period, and the voltage of the first node increases from the first voltage to the second voltage by resonance based on the inductive load and the resonant capacitor.

2. The device of claim 1 , wherein the first switching element is turned on at a first time point to increase the voltage of the first node to the first voltage,
the third switching element is turned on at a second time point after the first time point to increase the voltage of the first node from the first voltage to the second voltage,
the second switching element is turned on at a third time point after the second time point to decrease the voltage of the first node from the second voltage to the first voltage, and
the fourth switching element is turned on at a fourth time point after the third time point to decrease the voltage of the first node from the first voltage to the ground voltage.

3. The device of claim 1 , wherein in response to the second switching element being turned on during a third period separated from the second period, the voltage of the first node decreases from the second voltage to the first voltage by resonance based on the inductive load and the resonant capacitor,
in response to the fourth switching element being turned on during a fourth period, part of which overlaps the third period, and the voltage of the first node decreases from the first voltage to the ground voltage by resonance based on the inductive load and the resonant capacitor.

4. The device of claim 1 , further comprising:
a first diode connected between the first switching element and the first node; and
a second diode connected between the second switching element and a second node.

5. A home appliance a power converting device, the home appliance comprising:
a first capacitor;
a first switching element turned on to output a first voltage stored in the first capacitor to a first node which is one end of an inductive load;
a second switching element, one end of which is connected to the first switching element and which is turned on to decrease the voltage of the first node to the first voltage;
a third switching element turned on to output a second voltage greater than the first voltage to the first node which is one end of the inductive load;
a fourth switching element, one end of which is connected to the third switching element and which is turned on to decrease the voltage of the first node to the ground voltage; and
a resonant capacitor coupled between the other end of the inductive load and the ground,
wherein in response to the first switching element being turned on during a first period, the voltage of the first node increases to the first voltage by resonance based on the inductive load and the resonant capacitor, and
wherein, in response to the third switching element being turned on during a second period, part of which overlaps the first period, and the voltage of the first node increases from the first voltage to the second voltage by resonance based on the inductive load and the resonant capacitor.

6. The home appliance of claim 5 , wherein in response to the first switching element being turned on during a first period, the voltage of the first node increases to the first voltage by resonance based on the inductive load and the resonant capacitor,
in response to the third switching element being turned on during a second period, part of which overlaps the first period, and the voltage of the first node increases from the first voltage to the second voltage by resonance based on the inductive load and the resonant capacitor.

7. The home appliance of claim 6 , wherein in response to the second switching element being turned on during a third period separated from the second period, the voltage of the first node decreases from the second voltage to the first voltage by resonance based on the inductive load and the resonant capacitor,
in response to the fourth switching element being turned on during a fourth period, part of which overlaps the third period, and the voltage of the first node decreases from the first voltage to the ground voltage by resonance based on the inductive load and the resonant capacitor.

8. The home appliance of claim 5 , wherein the home appliance further comprising:
a first diode connected between the first switching element and the first node; and
a second diode connected between the second switching element and a second node.

Assignees

• Lg Electronics Inc

Inventors

• Han Sangchul
• Jun Chaseung
• Lee Sangju
• Kong Taewoong
• Choi Hyojin
• Park Jinwoo

Classifications

• H05B6/06

  Control, e.g. of temperature, of power · CPC title

• H02M7/487

  Neutral point clamped inverters · CPC title

• H02M7/483

  Converters with outputs that each can have more than two voltages levels · CPC title

• H05B6/04

  Sources of current · CPC title

• H02M1/0054

  Transistor switching losses (periodically suspending operation of switching converter in low power mode H02M1/0035) · CPC title