KR102260446B1 - Power converting apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a power converter and a home appliance having the same. A power conversion device according to an embodiment of the present invention includes a power input unit including an AC connection unit connected to an external AC power source and a DC connection unit connected to an external DC power source, a power detection unit for detecting power input through the power input unit, AC an AC load driven based on a current, an AC load driving unit connected between the power input unit and the AC load, and outputting an AC current to the AC load based on power input through the power input unit, and a control unit, the control unit comprising: When the input of DC power is detected through the sensing unit, the operation of the AC load driving unit is controlled so that the AC current is output to the AC load based on the DC power, and when the input of AC power is detected through the power sensing unit, the AC power An operation of the AC load driving unit may be controlled so that an AC current is output to the AC load based on the . Accordingly, the AC load driven by the AC power may be smoothly driven regardless of the type of input power. In addition, various embodiments are possible.

Description

POWER CONVERTING APPARATUS AND HOME APPLIANCE INCLUDING THE SAME

The present invention relates to a power converter and a home appliance having the same, and more particularly, to a power converter capable of selectively using AC power and DC power, and a home appliance having the same.

The power converter is a device that converts input power and supplies the converted power. Such a power converter is disposed in a home appliance, and converts input power into power for driving the home appliance.

For example, a power converter using AC power converts input AC power into DC power for driving home appliances, and a power converter using DC power converts input DC power to various voltages for driving home appliances. It can be converted to a level driving power supply.

1 is a diagram illustrating an example of a configuration diagram of an AC-based power supply system.

Referring to FIG. 1 , the AC-based power supply system 1 receives AC power from the outside, and a home appliance 30 that operates based on the AC power, and based on the AC power received from the outside, It may include an energy storage device 20 for storing the generated or generated DC power based on renewable energy.

The power supply system 1 may include a renewable energy-based power generation device, such as a solar module 40 that includes a solar cell and generates and outputs DC power based on the solar cell.

The energy storage device 20 may include at least one battery 21 , and may store power in the battery 21 through a charge/discharge charger 22 .

Also, the energy storage device 20 may include a DC/DC converter 23 to be converted into a voltage level for charging the battery 21 .

Meanwhile, the energy storage device 20 may supply power generated by the solar module 40 or stored in the battery 21 to the outside. To this end, the energy storage device 20 may include a DC/AC inverter 24 .

Meanwhile, the battery 21 may be stored based on AC power received from the outside. In this case, the energy storage device 20 may include a bidirectional converter (not shown) instead of the DC/AC inverter 24 .

AC power may be supplied from the commercial power plant 11 to the home energy storage device 20 , the home appliance 30 , and the like.

The home appliance 30 requires an AC/DC converter 31 to use the DC component 32 , such as an inverter manufactured to use a DC power source.

For example, AC power received from the home appliance 30 is converted into DC power in the AC/DC converter 31 , and the motor 33 is driven through the inverter 32 .

In some cases, AC components 34 such as heaters, valves, and door switches manufactured to use AC power may operate using AC power.

Recently, due to the decrease in efficiency due to AC/DC conversion, the increase in parts and manufacturing costs for power conversion, and high-frequency noise caused by AC power, and the increase in DC-based distributed power generation such as solar power generation, the DC-based power supply has been reduced. Research is increasing.

2 is a diagram illustrating an example of a configuration diagram of a DC-based power supply system.

Referring to FIG. 2 , the DC-based power supply system 2 receives DC power from the outside and operates based on the DC power. The home appliance 60 operates on the basis of the DC power received from the outside. It may include an energy storage device 50 for storing the generated or generated DC power based on renewable energy.

The energy storage device 50 may include at least one battery 51 , and may store power in the battery 51 through the charge/discharge charger 52 .

In addition, the energy storage device 50 may include a DC/DC converter 53 to be converted into a voltage level for charging the battery 51 .

Meanwhile, the energy storage device 50 may supply power generated in the solar module 40 or stored in the battery 51 to the outside without the DC/AC inverter 24 or the bidirectional converter.

When DC power is supplied from the commercial power plant 12 , the home appliance 60 may receive DC power, not AC power, and directly drive internal components. Accordingly, the high-frequency noise caused by the AC power source is not generated, and further, the converter 31 or the like does not need to be provided, thereby reducing the manufacturing cost. In addition, it is possible to configure only the DC components 61 and 62 .

On the other hand, as the spread of new and renewable energy including solar power is activated and efforts to reduce energy and improve energy efficiency increase, the demand for DC home appliances connected to DC distribution is increasing.

For example, Prior Art 1 (Korean Patent Application Laid-Open No. 10-2011-0097254 (published on August 31, 2011) discloses a power supply network using a direct current source and an electric product based thereon.

In the prior art 1, a large-capacity AC/DC converter is installed at the inlet end of a building and DC power is input to home appliances, thereby reducing losses due to inverters and the like, thereby reducing energy consumption.

However, the prior art 1 relates to a DC-only home appliance, and is difficult to use in an existing AC power distribution environment.

The failure of DC-only home appliances to be used in an AC distribution environment further increases the conversion cost and makes governments hesitate to accelerate the transition to DC distribution, which has many advantages.

In addition, individual users are hesitant to purchase DC-only home appliances that cannot be used in an AC distribution environment.

In addition, there is a problem in that a separate converter must be provided outside the home appliance when it is not a DC-based power supply environment. Providing a separate converter increases manufacturing cost and service cost.

In addition, unskilled users may have difficulties in installing and using electric appliances, and there is a risk of safety accidents.

Accordingly, there is a demand for an AC/DC combined home appliance. AC/DC combined home appliance has the advantage that it can be freely used in an AC distribution environment and a DC distribution environment.

In addition, AC/DC combined home appliances can be purchased without worrying about whether customers should use more AC appliances or replace them with DC appliances during the transition period to DC distribution, so it has the effect of speeding up the DC distribution conversion.

In addition, there is a need for an AC/DC combined home appliance capable of improving stability by preventing an arc that may occur when using DC power while implementing at a low cost.

In addition, an AC/DC combined home appliance that is not difficult to install and use even for unskilled users is required.

In order to achieve the above object, the power conversion device according to an embodiment of the present invention transmits the input AC power to an AC load through an AC power relay when AC power is input from the outside, and DC power is input from the outside. In this case, the input DC power may be transferred to the DC/AC inverter through the DC power relay to be converted, and the AC power converted and output from the DC/AC inverter may be transferred to the AC load.

In order to achieve the above object, a power conversion device according to an embodiment of the present invention includes a power input unit including an AC connection unit connected to an external AC power source and a DC connection unit connected to an external DC power source, and power input through the power input unit. A power sensing unit for sensing, an AC load driven based on an alternating current, an AC load driving unit and a control unit connected between the power input unit and the AC load and outputting an alternating current to the AC load based on the power input through the power input unit; Including, wherein, when the input of DC power is sensed through the power sensing unit, the control unit controls the operation of the AC load driving unit so that the AC current is output to the AC load based on the DC power, and the input of the AC power through the power sensing unit When this is detected, the operation of the AC load driver may be controlled to output an AC current to the AC load based on the AC power.

In order to achieve the above object, a home appliance according to an embodiment of the present invention detects power input through a power input unit and a power input unit including an AC connection unit connected to an external AC power source and a DC connection unit connected to an external DC power source It includes a power sensing unit, an AC load driven based on an alternating current, an AC load driving unit and a control unit connected between the power input unit and the AC load, and outputting an alternating current to the AC load based on the power input through the power input unit And, when the input of DC power is sensed through the power sensing unit, the control unit controls the operation of the AC load driving unit so that the AC current is output to the AC load based on the DC power, and the input of AC power through the power sensing unit is When it is sensed, a power converter capable of controlling the operation of the AC load driver to output an AC current to the AC load based on the AC power may be provided.

According to various embodiments of the present invention, it is possible to provide an AC/DC combined home appliance.

In addition, according to various embodiments of the present invention, manufacturing cost can be reduced by commonizing a power circuit to which power is input.

In addition, according to various embodiments of the present invention, components driven by AC power may be smoothly operated regardless of the type of input power.

In addition, according to various embodiments of the present invention, it can be used as an AC home appliance in an area where DC power distribution is not spread, and can be used as a DC home appliance without the need to replace the product even if DC power distribution is later spread.

On the other hand, various other effects will be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 is an example of a configuration diagram of an AC-based power supply system.
2 is an example of a configuration diagram of a DC-based power supply system.
3 is a simplified internal block diagram of a power conversion device according to an embodiment of the present invention.
4 is a simplified internal circuit diagram of a power conversion device according to an embodiment of the present invention.
5A and 5B are diagrams referenced in the description of the operation of the power conversion device according to an embodiment of the present invention.
6 is a schematic diagram of an outdoor unit and an indoor unit of an air conditioner that is another example of a home appliance according to an embodiment of the present invention.
7 is a diagram schematically illustrating the configuration of a refrigerator that is another example of a home appliance according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. In the drawings, in order to clearly and briefly describe the present invention, the illustration of parts irrelevant to the description is omitted, and the same reference numerals are used for the same or extremely similar parts throughout the specification.

The suffixes "module" and "part" for the components used in the following description are given simply in consideration of the ease of writing the present specification, and do not give a particularly important meaning or role by themselves. Accordingly, the terms “module” and “unit” may be used interchangeably.

In the present application, terms such as "comprises" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that it does not preclude the existence of, or addition of, elements, numbers, steps, operations, components, parts, or combinations thereof.

Also, in this specification, terms such as first and second may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

3 is a simplified internal block diagram of a power conversion device according to an embodiment of the present invention.

On the other hand, the power converter 300 described herein may be a power converter provided in the home appliance. A home appliance may be a concept including, for example, a refrigerator, a washing machine, a dryer, an air conditioner, a dehumidifier, a cooking appliance, a cleaner, a lighting device, an electric vehicle, a drone, a TV, a monitor, a mobile terminal, a wearable device, a server, etc. .

Referring to FIG. 3 , the power conversion device 300 according to an embodiment of the present invention includes a power input unit 310 , a noise filter 320 , a power detection unit S1 , an AC load driving unit 330 , and an AC load. 340 and/or a controller (not shown).

The power converter 300 may further include, for example, a rectifier 350 , a dc terminal capacitor C, an inverter 360 and/or a voltage converter 380 .

The power input unit 310 may receive, for example, at least one of DC power and AC power from the outside. For example, here, the outside may be a concept including, for example, a power plant capable of supplying power, a solar module, an energy storage device, and the like.

The power input unit 310 may include, for example, an AC connection unit 311 connected to an external AC power supply and a DC connection unit 312 connected to an external DC power supply. For example, the AC connector 311 may be connected to an AC plug, and the DC connector 312 may be connected to a DC plug. A user can install and drive a home appliance by a simple operation of connecting an AC plug and/or a DC plug to the power input unit 310 and plugging it into an outlet.

According to an embodiment, an AC plug and a DC plug may be previously connected to the AC connection part 311 and the DC connection part 312 by the manufacturer, respectively. Preferably, one of the AC plug or the DC plug may be released by being connected to the corresponding one of the AC connector 311 or the DC connector 312 .

In this case, the user can install and drive the home appliance with a simple operation of plugging an AC plug and/or a DC plug into an outlet.

However, in direct current, unlike alternating current, current flows constantly, there is no zero point of the current, and natural extinguishing is impossible, so an arc may be generated at the electrical contact point.

In particular, when the power plug is opened without a DC arc discharge countermeasure device, a back electromotive force generated from a DC load is induced to the plug, thereby causing a large arc.

Therefore, preferably, the DC plug can be provided with an arc extinguishing device. For example, the DC plug may include at least one of an electrical type extinguishing device for limiting back electromotive force that significantly increases arc voltage, a magnetic extinguishing device using magnetic force, and a mechanical contact extinguishing device.

The power conversion device 300 according to an embodiment of the present invention may be configured to selectively input a DC plug and an AC plug. In this case, the power plug-in DC plug at the time of DC input may include an arc extinguishing device in order to prevent arc generation during initial connection and arc generation due to user's mistake during plug opening during operation.

The power detection unit S1 may be connected to an output terminal of the power input unit 310 to detect power output from the power input unit 310 , for example.

The power detection unit S1 may detect whether DC power and/or AC power is input through the power input unit 310 .

The power sensing unit S1 may include, for example, a resistance element, an OP-AMP, or the like, to sense power output from the power input unit 310 .

The power sensing unit S1 may include, for example, an AC power sensing unit (not shown) for detecting an input of DC power and a DC power sensing unit (not shown) for sensing an input of AC power, respectively. .

The noise filter 320 may be connected to an output terminal of the power input unit 310 , and may remove a noise component included in the power output from the power input unit 310 .

The noise filter 320 may be, for example, an EMI filter (electromagnetic interference filter) that removes a noise component of the AC power supplied through the AC connection unit 311 .

The noise filter 320 may include, for example, an inductor, a capacitor, a resistor, etc., but the noise filter 320 of the present invention is not limited to the above configuration, and further includes a configuration capable of filtering power. can do.

The AC load driving unit 330 may drive the AC load 340 based on power input through the power input unit 310 , for example. For example, the AC load driver 330 may drive the AC load 340 by outputting an AC current to the AC load 340 .

The AC load driving unit 330 may drive the AC load 340 by, for example, when AC power is output from the power input unit 310 , transfer the AC power to the AC load 340 .

The AC load driving unit 330 may, for example, convert DC power when DC power is output from the power input unit 310 , and output the converted AC current to the AC load 340 to the AC load 340 . ) can be driven.

The AC load 340 may be, for example, a configuration of a home appliance driven by an AC power source. For example, the AC load 340 may include components operating using alternating current, such as a heater and a valve.

The AC load 340 may be driven by, for example, an AC current output from the AC load driving unit 330 .

The control unit, for example, may be connected to each component provided in the power conversion device (300). The control unit may, for example, transmit/receive signals to and from each component provided in the power supply device 300 , and may control the overall operation of each component.

The controller may, for example, check whether DC power and/or AC power is input through the power input unit 310 through the power detection unit S1 .

The control unit may control the operation of the AC load driving unit 330 , for example. The controller may, for example, control the operation of the AC load driver 330 based on a detection result by the power detector S1 .

The rectifying unit 350 may include, for example, a plurality of diodes. The rectifier 350 may be formed of, for example, a diode without a switching element, and may perform a rectification operation without a separate switching operation when AC power is input.

The rectifier 350 may, for example, convert AC power input through the AC connection unit 311 into DC power and output the converted power.

For example, when a DC current is input through the DC connection unit 312 , the rectifier 350 may always output DC power having a constant polarity according to the operation of a plurality of diodes according to the polarity of the DC power supply.

Accordingly, the rectifier 350 can operate as a safety device against the DC reverse wiring, so that even if an unskilled user connects the polarity of the DC power to either side, the rectifier 350 has the same output, It can improve safety and convenience.

The dc terminal capacitor C may be connected to, for example, a dc terminal that is an output terminal of the rectifying unit 350 , and may store power output from the rectifying unit 350 . In the drawings, one element is illustrated as a dc terminal capacitor (C), but the present invention is not limited thereto, and a plurality of elements may be provided to ensure element stability.

The inverter 360 may include, for example, a plurality of switching elements, and may output DC power to the motor 370 based on a control signal received from the controller.

More specifically, the inverter 360 may convert, for example, a DC power smoothed by on/off operations of a plurality of switching elements into a three-phase AC power of a predetermined frequency, and output the converted DC power to the motor 370 .

For example, when the upper-arm switching element and the lower-arm switching element are connected in series to form a pair, the inverter 360 may include a total of three pairs of the upper-arm switching element and the lower-arm switching element connected in parallel to each other. For example, a diode may be connected in anti-parallel to each switching element included in the inverter 360 .

The plurality of switching elements included in the inverter 360 may operate based on, for example, a control signal received from the controller.

The motor 370 may include, for example, a three-phase synchronous motor. The motor 370, for example, may include a stator and a rotor, and each phase AC power of a predetermined frequency is applied to the coil of the stator of each phase (a, b, c), The rotor can rotate.

Motor 370 may include, for example, a surface-mounted permanent-magnet synchronous motor (SMPMSM), an interior permanent magnet synchronous motor (IPMSM), and synchronous reluctance. It may include a motor (synchronous reluctance motor; Synrm) and the like. Among them, SMPMSM and IPMSM are permanent magnet synchronous motors (PMSM) applied with permanent magnets, and Synrm is characterized by not having permanent magnets.

The voltage converter 380 may be connected to, for example, a dc terminal that is an output terminal of the rectifier 350 . The voltage converter 380 may convert, for example, a DC voltage into a voltage of a predetermined level. For example, the voltage converter 380 may step-down and output the DC voltage.

The voltage converter 380 may include, for example, a switching mode power supply (SMPS). The voltage converter 380 may output voltages of various sizes (eg, 5V, 7.5V, 10V, 15V, etc.) required by circuit elements provided in the power converter 300 , for example.

For example, DC power input with DC 380V is used for energy storage devices (ESS), solar power generation, electric vehicles (EVs), and inverter home appliances, and loads of 24V or less such as video/computer devices and internal units in home appliances are used. It can respond by stepping down the voltage converter 380 .

4 is a simplified internal circuit diagram of a power conversion device according to an embodiment of the present invention. A detailed description of the content overlapping with the content described in FIG. 3 will be omitted.

Referring to FIG. 4 , the power input unit 310 may include, for example, an AC power relay 315 connected to the AC connection unit 311 . For example, when the AC power relay 315 is turned on while the AC plug 301 is connected to the AC connection part 311 , AC power may be input through the AC connection part 311 , and the AC power When the relay 315 is turned off, the input of AC power through the AC connection unit 311 may be blocked.

On the other hand, the power input unit 310 is, for example, connected to the DC connection unit 312 to which the DC plug 302 is connected, and a DC power relay (not shown) capable of cutting off the DC power input through the DC connection unit 312 . city) may be further provided.

The controller may, for example, control the operation of the AC power relay 315 provided in the power input unit 310 . The controller may, for example, control the operation of the AC power relay 315 based on a detection result by the power detection unit S1 .

For example, when DC power is input through the power input unit 310 , the controller may control the AC power relay 315 to be turned off. For example, when both DC power and AC power are input through the power input unit 310 , the controller may control the AC power relay 315 to be turned off. Through this, it is possible to preferentially use a high-efficiency DC power supply.

Meanwhile, for example, when there is an abnormality in the input DC power, the controller may control the AC power relay 315 to be turned on, thereby controlling the AC power to be input. For example, since it is possible to switch to AC power when the DC distribution system fails, it can be operated stably by switching to AC power when the DC distributed power supply is abnormal.

The AC load driving unit 330 may include, for example, an AC power relay 331 that transmits AC power output from the power input unit 310 to the AC load 340 .

The AC load driving unit 330 may transmit AC power to the AC load 340 through the AC power relay 331 when AC power is output from the power input unit 310 .

The AC load driving unit 330 includes, for example, a DC/AC inverter 333 that converts DC power into AC power and outputs it, and a DC/AC inverter 333 that converts the DC power output from the power input unit 310 to the DC/AC inverter 333 . A DC power relay 332 may be provided to transmit.

The AC load driving unit 330 may transmit DC power to the DC/AC inverter 333 through the DC power relay 332 when, for example, DC power is output from the power input unit 310 , The AC current converted by the AC inverter 333 may be output to the AC load 340 . In this case, the voltage value of the AC power converted through the DC/AC inverter 330 may be, for example, the same as the voltage value of the AC power input from the power input unit 310 .

In this case, the operations of the AC power relay 331 and the DC power relay 332 may be controlled by, for example, a controller. For example, when the input of AC power is sensed through the power detection unit S1, the controller may control the AC power relay 331 to be turned on and the DC power relay 332 to be turned off. . On the other hand, for example, when the input of DC power is sensed through the power detection unit S1, the control unit controls the AC power relay 331 to be turned off and the DC power relay 332 to be turned on. can

The power converter 300 may further include, for example, a drive control relay 345 connected between the AC load driver 330 and the AC load 340 . For example, when the driving control relay 345 is turned on, an AC current output from the AC load driving unit 330 may be transmitted to the AC load 340 .

The controller may, for example, control the operation of the driving control relay 345 to control the driving of the AC load 340 . For example, the controller may control the driving control relay 345 to be turned on, thereby controlling the AC load 340 to be driven.

5A and 5B are diagrams referenced in the description of the operation of the power conversion device according to an embodiment of the present invention.

Referring to FIG. 5A , when AC power is input through the AC connection unit 311 of the power input unit 310 , the controller may detect the input of AC power through the power sensing unit S1 .

In addition, the controller may control the AC power relay 331 provided in the AC load driving unit 330 to be turned on as the AC power input is sensed.

In this case, AC power output from the power input unit 310 may be transmitted to the AC load 340 through the AC power relay 331 , and the AC load 340 may be driven by the transmitted AC power.

Meanwhile, referring to FIG. 5B , when DC power is input through the DC connection unit 312 of the power input unit 310 , the controller may detect the input of the DC power through the power detection unit S1 .

In addition, the controller may control the DC power relay 332 provided in the AC load driving unit 330 to be turned on as the DC power input is sensed. Meanwhile, when detecting the input of DC power, the controller may control the AC power relay 315 to be turned off.

Meanwhile, the DC power output from the power input unit 310 may be transmitted to the DC/AC inverter 333 through the DC power relay 332 , and the DC/AC inverter 330 may convert the DC power into AC power. can

AC current converted and output from the DC/AC inverter 330 may be transmitted to the AC load 340 through the drive control relay 345 , and the AC load 340 may be driven by the transmitted AC power. .

As described above, the power conversion device 300 according to various embodiments of the present invention can smoothly drive the AC load 340 driven by the AC power, regardless of the type of input power. Through this, it is possible to use AC home appliances even in areas where DC power distribution is not widespread, and even if DC power distribution is spread thereafter, it can be used as DC home appliances without needing to replace the product.

6 is a schematic diagram of an outdoor unit and an indoor unit of an air conditioner, which is another example of a home appliance according to an embodiment of the present invention.

Referring to FIG. 6 , the air conditioner 100b may include an outdoor unit 21b and an indoor unit 31b.

The outdoor unit 21b includes, for example, a compressor 102b serving to compress the refrigerant, a compressor electric motor 102bb driving the compressor, an outdoor heat exchanger 104b serving to radiate heat from the compressed refrigerant; An outdoor blower 105b comprising an outdoor fan 105ab disposed on one side of the outdoor heat exchanger 104b to promote heat dissipation of the refrigerant and an electric motor 105bb rotating the outdoor fan 105ab, and expansion to expand the condensed refrigerant The mechanism 106b, the cooling/heating switching valve 110b for changing the flow path of the compressed refrigerant, the accumulator 103b for supplying the refrigerant at a constant pressure to the compressor after removing moisture and foreign substances by temporarily storing the vaporized refrigerant, etc. may include

The indoor unit 31b includes, for example, an indoor heat exchanger 109b disposed indoors to perform a cooling/heating function, and an indoor fan disposed at one side of the indoor heat exchanger 109b to promote heat dissipation of the refrigerant. 109ab) and an indoor blower 109b including an electric motor 109bb for rotating the indoor fan 109ab.

At least one indoor heat exchanger 109b may be installed in the indoor unit 31b. The compressor 102b may be, for example, at least one of an inverter compressor and a constant speed compressor.

In addition, the air conditioner 100b may be constituted of, for example, an air conditioner that cools an indoor space, or may be constituted of a heat pump that cools or heats an indoor space.

7 is a diagram schematically illustrating the configuration of a refrigerator that is another example of a home appliance according to an embodiment of the present invention.

Referring to FIG. 7 , the refrigerator 100c receives the refrigerant condensed from the compressor 112c, the condenser 116c condensing the refrigerant compressed in the compressor 112c, and the condenser 116c and evaporates it. , a freezing chamber evaporator 124c disposed in a freezing chamber (not shown), a freezing chamber expansion valve 134c for expanding the refrigerant supplied to the freezing chamber evaporator 124c, and the like.

Meanwhile, in the drawings, it is illustrated that one evaporator is used, but it is also possible to use each evaporator in the refrigerating compartment and the freezing compartment.

That is, the refrigerator 100c supplies, for example, the refrigerant condensed in the refrigerating compartment evaporator (not shown) and the condenser 116c disposed in the refrigerating compartment (not shown) to the refrigerating compartment evaporator (not shown) or the freezing compartment evaporator 124c. It may further include a three-way valve (not shown) and a refrigerating compartment expansion valve (not shown) for expanding the refrigerant supplied to the refrigerating compartment evaporator (not shown).

Also, the refrigerator 100c may further include, for example, a gas-liquid separator (not shown) in which the refrigerant that has passed through the evaporator 124c is separated into a liquid and a gas.

In addition, the refrigerator 100c, for example, sucks cold air that has passed through the freezer compartment evaporator 124c and blows it into a refrigerating compartment (not shown) and a freezing compartment (not shown), respectively, a refrigerating compartment fan (not shown) and a freezer compartment fan (144c). ) may be further included.

In addition, the refrigerator 100c includes, for example, a compressor driving unit 113c driving the compressor 112c, a refrigerating compartment fan (not shown) and a refrigerating compartment fan driving unit (not shown) driving the freezing compartment fan 144c, and a freezing compartment fan. A driving unit 145c may be further included.

Meanwhile, according to the drawing, since the common evaporator 124c is used in the refrigerating compartment and the freezing compartment, in this case, a damper (not shown) may be installed between the refrigerating compartment and the freezing compartment, and the fan (not shown) is a single evaporator. The generated cold air may be forced to be supplied to the freezer compartment and the refrigerating compartment.

The accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the present specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and scope of the present invention It should be understood to include water or substitutes.

Likewise, although acts are depicted in the drawings in a particular order, it should not be construed that such acts must be performed in that particular order or sequential order shown, or that all depicted acts must be performed in order to achieve desirable results. . In certain cases, multitasking and parallel processing can be advantageous.

In addition, although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the claims In addition, various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

300: power converter
310: power input
311: AC connection
312: DC connection
320: noise filter
330: AC load driving unit
340: AC load
350: rectifying unit
360: inverter unit
370: motor
380: voltage converter
C: dc stage capacitor
S1: Power Detector

Claims (10)

a power input unit including an AC connection unit connected to an external AC power supply and a DC connection unit connected to an external DC power supply;
a power sensing unit for detecting power input through the power input unit;
AC load driven based on alternating current;
a first relay having one end connected to an output end of the power input unit and the other end connected to the AC load;
an inverter converting the DC power and outputting the AC current to the AC load;
a second relay having one end connected to an output terminal of the power input unit and the other terminal connected to the inverter;
a third relay for blocking the input of the AC power input from the AC connection unit; and
comprising a control unit, the control unit comprising:
When the input of DC power is sensed through the power detection unit, the first relay is turned off and the second relay is controlled to be turned on,
When the input of AC power is sensed through the power detection unit, the first relay is turned on and the second relay is controlled to be turned off,
When both the input of the DC power and the input of the AC power are sensed through the power detection unit, the third relay is controlled to turn off so that the input of the AC power is cut off;
While the input of the AC power is cut off through the third relay, check the state of the DC power;
When there is an abnormality in the state of the DC power, the power conversion device, characterized in that the control so that the third relay is turned on so that the AC power is re-input. delete delete The method of claim 1,
Further comprising a fourth relay having one end connected to the other end of the first relay and the inverter, and the other end connected to the AC load,
The control unit,
By controlling the operation of the fourth relay to control the driving of the AC load,
When the fourth relay is turned on, the other end of the first relay is connected to the AC load. delete The method of claim 1,
The power sensing unit,
a DC power detection unit detecting the input of the DC power; and
Power conversion device comprising an AC power detection unit for detecting the input of the AC power. delete The method of claim 1,
The power conversion device further comprising a noise filter connected between the output terminal of the power input unit, and one end of the first relay and one end of the second relay. The method of claim 8,
The DC connection unit,
Power conversion device, characterized in that connected to the DC plug having an arc extinguishing device. Claim 1, Claim 4, Claim 6, Claim 8 and Claim 9 of any one of claims 9 home appliance having a power converter.

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