CN-115485961-B - Power conversion device and household appliance with same

CN115485961BCN 115485961 BCN115485961 BCN 115485961BCN-115485961-B

Abstract

The present invention relates to a power conversion device and a household appliance having the same. The power conversion device of the embodiment of the invention comprises a first capacitor, a first switching element, a second switching element, a third switching element and a fourth switching element, wherein the first capacitor stores a first voltage, the first switching element is connected to output the first voltage stored in the first capacitor to a first node which is one end of an inductive load, one end of the second switching element is connected with the first switching element and is connected to enable the voltage of the first node to drop to the first voltage, the third switching element is connected to output a second voltage which is larger than the first voltage to the first node which is one end of the inductive load, and the fourth switching element is connected with one end of the third switching element and is connected to enable the voltage of the first node to drop to the ground voltage. This can reduce switching loss when power is supplied to the inductive load.

Inventors

HAN XIANGZHE
TIAN QIECHENG
LI XIANGZHOU
Kong Taixiong
CUI XIAOZHEN
Pu Zhenyou

Assignees

LG电子株式会社

Dates

Publication Date: 20260512
Application Date: 20210303
Priority Date: 20200305

Claims (11)

1. A power conversion device, characterized by comprising: a first capacitor storing a first voltage; A first switching element that is turned on to output the first voltage stored in the first capacitor to a first node that is one end of an inductive load; A second switching element having one end connected to the first switching element and turned on to decrease the voltage of the first node to the first voltage; A third switching element that is turned on to output a second voltage greater than the first voltage to the first node that is one end of the inductive load; a fourth switching element connected to one end of the third switching element and turned on to reduce the voltage of the first node to a ground voltage, and A resonant capacitor arranged between the other end of the inductive load and ground, Turning on the first switching element during a first period, the voltage of the first node rising to the first voltage by resonance based on the inductive load and the resonance capacitor, The third switching element is turned on during a second period of time a portion of which overlaps the first period of time, and the voltage of the first node rises from the first voltage to the second voltage by resonance based on the inductive load and the resonance capacitor.
2. The power conversion device according to claim 1, wherein, At a first point in time, turning on the first switching element, the voltage of the first node rising to the first voltage, Turning on the third switching element at a second time point after the first time point, the voltage of the first node rising from the first voltage to the second voltage, Turning on the second switching element at a third time point after the second time point, the voltage of the first node is reduced from the second voltage to the first voltage, At a fourth time point after the third time point, the fourth switching element is turned on, and the voltage of the first node is reduced from the second voltage to the ground voltage.
3. The power conversion device according to claim 1, wherein, Turning on the second switching element during a third period of time, which is spaced apart from the second period of time, the voltage of the first node being reduced from the second voltage to the first voltage by resonance based on the inductive load and the resonance capacitor, The fourth switching element is turned on during a fourth period of time a portion of which overlaps the third period of time, and the voltage of the first node is reduced from the first voltage to the ground voltage by resonance based on the inductive load and the resonance capacitor.
4. The power conversion device according to claim 1, characterized by further comprising: A first diode connected between the first switching element and the first node, and And a second diode connected between the second switching element and a second node.
5. A power conversion device, characterized by comprising: A first switching element and a second switching element connected in series with each other; A first capacitor having one end connected to the first switching element and storing a first voltage; An inductive load connected to a first node between the first switching element and the second switching element; a third switching element and a fourth switching element connected in series with each other, and A resonant capacitor arranged between the other end of the inductive load and ground, The third switching element and the fourth switching element are connected to the first node, The third switching element is connected to a second voltage source supplying a second voltage, The voltage of the first node is stepped up with the sequential turn-on of the first switching element and the third switching element, Turning on the first switching element during a first period, the voltage of the first node rising to the first voltage by resonance based on the inductive load and the resonance capacitor, The third switching element is turned on during a second period of time a portion of which overlaps the first period of time, and the voltage of the first node rises from the first voltage to the second voltage by resonance based on the inductive load and the resonance capacitor.
6. The power conversion device according to claim 5, wherein, The voltage of the first node is raised to the first voltage by the turning-on of the first switching element, and is raised from the first voltage to the second voltage by the turning-on of the third switching element.
7. The power conversion device according to claim 5, wherein, The voltage of the first node is gradually decreased as the second switching element and the fourth switching element are sequentially turned on.
8. The power conversion device according to claim 7, wherein, The voltage of the first node is reduced from the second voltage to the first voltage by the turn-on of the second switching element, and is reduced from the first voltage to a ground voltage by the turn-on of the fourth switching element.
9. The power conversion apparatus as claimed in claim 5, wherein, Turning on the second switching element during a third period of time, which is spaced apart from the second period of time, the voltage of the first node being reduced from the second voltage to the first voltage by resonance based on the inductive load and the resonance capacitor, The fourth switching element is turned on during a fourth period of time a portion of which overlaps the third period of time, and the voltage of the first node is reduced from the first voltage to a ground voltage by resonance based on the inductive load and the resonance capacitor.
10. The power conversion device according to claim 5, characterized by further comprising: A first diode connected between the first switching element and the first node, and And a second diode connected between the second switching element and a second node.
11. A household appliance provided with the power conversion device according to any one of claims 1 to 10.

Description

Power conversion device and household appliance with same Technical Field The present invention relates to a power conversion device and a household appliance having the same, and more particularly, to a power conversion device capable of reducing switching loss when supplying power to an inductive load, and a household appliance having the same. Background The power conversion device is a device that converts input power and supplies the converted power to a load. On the other hand, when the load is an inductive load, a Single-ended resonant inverter or a half-bridge resonant inverter is used as the power conversion device. However, in the case of using the single-ended resonant inverter and the half-bridge resonant inverter, since the operating frequency is small, there is a problem in that the sizes of the resonant capacitor and the resonant inductor are large. Further, since the internal pressure of the switching element is high, there is a disadvantage in that the possibility of switching burn-out is high and the switching loss is large. Disclosure of Invention Problems to be solved by the invention The invention aims to provide a power conversion device capable of reducing switching loss when power is supplied to an inductive load and a household appliance with the power conversion device. Another object of the present invention is to provide a power conversion device capable of reducing an internal pressure of a switching element when power is supplied to an inductive load, and a household appliance having the same. It is still another object of the present invention to provide a power conversion device capable of supplying maximum power to an inductive load using resonance and a home appliance having the same. Technical proposal for solving the problems In order to achieve the above object, a power conversion device and a household appliance having the same according to an embodiment of the present invention includes a first capacitor storing a first voltage, a first switching element turned on to output the first voltage stored in the first capacitor to a first node that is one end of an inductive load, a second switching element connected to the first switching element at one end thereof to be 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 that is one end of the inductive load, and a fourth switching element connected to one end of the third switching element to be turned on to decrease the voltage of the first node to a ground voltage. In one aspect, at a first time point, the first switching element may be turned on, the voltage of the first node may rise to a first voltage, at a second time point after the first time point, the third switching element may be turned on, the voltage of the first node may rise from the first voltage to a second voltage, at a third time point after the second time point, the second switching element may be turned on, the voltage of the first node may drop from the second voltage to the first voltage, at a fourth time point after the third time point, the fourth switching element may be turned on, and the voltage of the first node may drop from the second voltage to the ground voltage. In one aspect, the power conversion apparatus of the embodiment of the present invention and the household appliance having the same may further include a resonance capacitor disposed between the other end of the inductive load and the ground. In one aspect, the first switching element is turned on during a first period, the voltage of the first node may rise to a first voltage by resonance based on the inductive load and the resonance capacitor, and the third switching element is turned on during a second period of time, a portion of which overlaps the first period, and the voltage of the first node may rise from the first voltage to a second voltage by resonance based on the inductive load and the resonance capacitor. In one aspect, the second switching element is turned on during a third period spaced apart from the second period, the voltage of the first node may be reduced from the second voltage to the first voltage by resonance based on the inductive load and the resonance capacitor, and the fourth switching element is turned on during a fourth period of which a portion overlaps with the third period, the voltage of the first node may be reduced from the first voltage to the ground voltage by resonance based on the inductive load and the resonance capacitor. In one aspect, the power conversion apparatus of the embodiment of the present invention may further include a first diode connected between the first switching element and the first node, and a second diode connected between the second switching element and the second node. In one aspect, a power conversion apparatus and a household appliance having the same according to another embodim