KR20110097254A - Power supply network using dc power supply and electric apparatus based on the power supply network - Google Patents

Abstract

The present invention includes a power supply receiving unit for receiving DC power from at least one power supply; A voltage level identification unit measuring a voltage level of the received DC power; A first DC / DC converter for converting the measured voltage level into a voltage level of the electrical appliance when the measured voltage level is different from the voltage level of the electrical appliance; And a control unit for operating a circuit in the electrical appliance according to the converted voltage level, wherein the DC power indicates a DC power supplied from a DC power supply or an AC power supplied from an AC power supply is an AC / DC converter. A direct current power converted by the power supply, and the direct current power supplied from the direct current power supply indicates a DC power stepped up or down by a second DC / DC converter existing outside the electrical appliance. Provides electrical products based on power supply networks.

Description

POWER SUPPLY NETWORK USING DC POWER SUPPLY AND ELECTRIC APPARATUS BASED ON THE POWER SUPPLY NETWORK}

The present invention relates to a power supply network using a direct current source and an electrical appliance based thereon.

The DC power supply not only reduces the number of AC-DC conversions, but also reduces power consumption through high efficiency conversion. With the urgent need to respond to global warming around the world, DC power supply can be a very effective measure. However, there are still many problems to be commercialized, such as power generation, difficulty in voltage variation, the need for excellent circuit breakers, generation of harmonics in large-capacity AC-DC conversion, and voltage drop in proportion to the magnitude of the transmission power. .

In addition, to improve the efficiency of products to meet the energy regulations of each country, it is necessary to increase the efficiency of the component parts or develop new systems. One of the most effective methods currently used for this is the inverter technology. By applying inverter technology that variably controls the motor speed to large household appliances such as washing machines, refrigerators, and air conditioners, it not only responds to environmental regulations such as reducing energy and noise, but also improves basic functions of the product, rapid heating and cooling, improved comfort, and freshness. Can also be implemented. However, when the DC power supply method is used as described above, the inverter electrical product also needs to be designed to be suitable therefor.

An object of the present invention is to construct a power supply network that can more efficiently use a supplied DC power supply.

In addition, the present invention is to provide an inverter electrical product suitable for a DC power supply system.

It is also an object of the present invention to provide an inverter electrical appliance that may be used in other regions of differing power supply schemes.

It is also an object of the present invention to provide an inverter electrical product which may be used in other regions where the supplied DC voltage is different.

The present invention includes a power supply receiving unit for receiving DC power from at least one power supply; A voltage level identification unit measuring a voltage level of the received DC power; A first DC / DC converter for converting the measured voltage level into a voltage level of the electrical appliance when the measured voltage level is different from the voltage level of the electrical appliance; And a control unit for operating a circuit in the electrical appliance according to the converted voltage level, wherein the DC power indicates a DC power supplied from a DC power supply or an AC power supplied from an AC power supply is an AC / DC converter. A direct current power converted by the power supply, and the direct current power supplied from the direct current power supply indicates a DC power stepped up or down by a second DC / DC converter existing outside the electrical appliance. Provides electrical products based on power supply networks.

In addition, the present invention, if there is a plurality of the received DC power, real-time power information receiving unit for receiving power information of each power supply from a plurality of power supply; And a power supply selector for selecting the cheapest power supply by comparing the power information, wherein the power information includes at least one of supplyable amount of power information, power rate information, power quality information, and supplyable time information. It is characterized by.

In addition, in the present invention, the AC / DC converter is characterized in that installed in the building entrance.

In addition, in the present invention, the power level identification unit is composed of a separate DC adapter, the DC adapter is characterized in that coupled to the outlet is connected to the plug of the electrical appliance.

In addition, in the present invention, the DC adapter, the first coupling portion to which the plug of the electrical appliance is coupled; A second coupling part coupled to the outlet; And a control unit for transmitting a control command to the first DC / DC converter for converting the measured voltage level into a voltage level of the electrical appliance.

In addition, in the present invention, the DC power supply is characterized in that it comprises at least one of solar energy, wind energy and fuel cells.

The present invention also provides an AC / DC adapter for delivering power received into at least one power supply into an electrical product; A voltage level identification unit measuring a voltage level of the transferred power; A first DC / DC converter for converting the measured voltage level into a voltage level of the electrical appliance when the measured voltage level is different from the voltage level of the electrical appliance; And a first controller configured to operate a circuit in an electric product according to the converted voltage level, wherein the AC / DC adapter includes: a zero crossing unit for identifying whether the received power is DC power or AC power; According to the identification result, when the received power is AC power, the control command to block the transmission of the received power, and to transmit the received power to the electrical product when the received power is DC power; And a second control unit for transmitting to a voltage level identification unit, wherein the direct current power indicates a direct current power supplied from a direct current power supply, and the direct current power supplied from the direct current power supply is a second DC / DC present outside the electrical appliance. An electrical product based on a power supply network using a direct current source, characterized by representing a boosted or stepped down DC power through a converter.

In addition, in the present invention, the electrical appliance, the plurality of received DC power, real-time power information receiving unit for receiving power information of each power supply from a plurality of power sources; And a power supply source selector configured to compare the power information to select the cheapest power supply source, wherein the power information includes at least one of supplyable amount of power information, power rate information, power quality information, and supplyable time information. It features.

In addition, in the present invention, the AC / DC adapter, the first coupling portion to which the plug of the electrical appliance is coupled; A second coupling part coupled to the outlet; And a switching unit which cuts off or transfers the received power according to a control command of the second control unit.

In addition, in the present invention, the DC power supply is characterized in that it comprises at least one of solar energy, wind energy and fuel cells.

The present invention can directly eliminate the AC / DC conversion or DC / AC conversion process that leads to power loss for each electrical product by directly delivering the DC power produced by the renewable energy to the electrical appliance to more efficiently It is possible to build a power supply network that can provide and further reduce power loss.

In addition, a large capacity AC / DC converter is installed at the local network inlet, building inlet, home or office inlet so that the power supplied to the local network, in the building, at home or in the office can be provided in a DC state. This eliminates the AC / DC converters required for each electrical product, reducing power loss due to conversion.

In addition, it is possible to identify the voltage level of the voltage input in the electrical appliance, thereby providing an electrical appliance that can be adaptively operated in other regions.

In addition, by inserting a zero crossing detection circuit into the power cord of the power supply of the electrical appliance, it is possible to provide an electrical appliance that can be adaptively operated in other regions.

In addition, by selecting a power source that can minimize costs, it becomes possible to manage energy more efficiently within the power supply network. In addition, users can minimize costs by selecting a power source according to power information provided in real time, and use energy efficiently.

1 is an embodiment to which the present invention is applied and shows a schematic diagram of an intelligent power supply network capable of transmitting and distributing DC power.
2 is an embodiment to which the present invention is applied and shows a schematic structure of a power supply network that can use a DC power source for an electrical product while reducing AC / DC conversion loss.
3 is an embodiment to which the present invention is applied and shows a schematic internal structure diagram of an electrical product that can be adaptively operated in a power supply network capable of supplying AC power and DC power.
4 is an embodiment to which the present invention is applied and shows a control block diagram of a power supply network in which both an AC power supply and a DC power supply are supplied, and in which an electric product can be adaptively used in an environment in which the supplied voltage level may be different. .
5 and 6 show an internal block diagram and a flow chart of an electric product for selecting a lowest charge power supply source in an embodiment to which the present invention is applied, under a power supply network capable of supplying both DC power and AC power.

The above objects and features of the construction will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In addition, the terms used in the present invention was selected as a general term widely used as possible now, but in some cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, It is to be understood that the present invention is to be understood as the meaning of terms rather than the names of terms.

1 is an embodiment to which the present invention is applied and shows a schematic diagram of an intelligent power supply network capable of transmitting and distributing DC power.

The intelligent power supply network 100 may be configured of at least one local area network or global area network. Examples of the local area network include a power network 110 for a power plant that can share power information between power plants, a home power network 130 that can share power information between electric appliances in a home, and an electric appliance in an office. The office power network 130 that can share the power information between them, or the central control network 120 that can control the power information between the local area, and the like. The global area network may mean a network including at least two local area networks, and may be understood as a relative concept corresponding to a local area network.

Referring to FIG. 1, as an example of the intelligent power supply network 100 to which the present invention is applied, the intelligent power supply network 100 may include a power network 110 for a power plant 110, a central control network 120, and at least one home / office. Office power network 130.

The power network 110 for a power plant may include a power plant that generates power through thermal power generation, nuclear power generation or hydroelectric power generation, and a solar power plant using wind or wind power as renewable energy. Power generated from thermal, nuclear or hydropower plants is sent to AC substations via transmission lines, and the substations distribute the power to demand in home / office power networks by changing the nature of the voltage or current. Here, a process of converting to DC using an AC / DC converter is involved in the process of transmitting / distributing power to a home / office power network, and an AC adapter installed in each home or office device uses an AC / DC converter. Is involved in the conversion. As described above, as the conversion from AC to DC, DC to AC, etc. is repeated several times, the conversion loss of the power becomes larger. In addition, since the power produced by the renewable energy is DC, it can be sent to the substation or directly distributed to each demand destination. Accordingly, the present invention is to provide a power supply network and an electrical product based thereon that can minimize the conversion process from AC to DC, DC to AC. In addition, the present invention provides a power supply network and an electric product based thereon that can directly supply and use DC power produced by renewable energy. This will be described in more detail with reference to FIGS. 2 to 6.

Meanwhile, the central control network 120 controls power supply, power consumption, power distribution and management between local area networks in the intelligent power supply network 100, and includes a global energy management system and an energy measurement system. do.

The global energy management system is responsible for controlling local energy management systems. For example, the global energy management system receives energy-related information from the local energy management system in the power network 110 for the power plant and the local energy management system in the home / office power network 130 and receives the intelligent power supply network ( 100) enables overall energy management.

Here, the energy management system (EMS) refers to a system for managing an energy control device using an energy management program. Examples of the energy control device include an automatic temperature control device, a cable set-top box, an intelligent display device, or an automatic equalization control device. The energy management system may manage the power of each demand source in real time through communication with the energy control device, and may also be able to predict the required power based on the accumulated data. The energy management system may be set up for each demand source or supply source, or may be set up for each local area network or each global area network. The energy management system may be provided as an energy management device. For example, a real-time price signal of the power market is relayed through a local energy management system installed in each home, and the local energy management system controls each electric product and an electric product, so that a user can use each local energy management system. By recognizing the power information of the electrical appliances and performing power management, such as setting a power limit or an electric charge limit, it is possible to save energy and cost.

And, the energy metering system (energy metering system) refers to a system for measuring the energy usage from the measuring instruments and collect and analyze information on the energy usage. Examples of the measuring device may include an electricity meter, a gas meter, a water meter, and the like.

The energy management system and the energy metering system enable consumers to efficiently use electricity, and provide power providers with the ability to detect problems on the system and operate the system efficiently.

In the case of the home electric power network 130, even at home, electricity can be produced and consumed through fuel cells mounted in solar power or a plug-in hybrid electric vehicle (PHEV), and the remaining electric power is used in another local area network. It can also be supplied or sold at. In each local area network, an energy measuring device is provided so that the power and electricity rates used in each demand source can be grasped in real time, and the power supply unit in the local area network recognizes the amount of electricity and the electricity rate currently used according to the situation. You can find ways to reduce power consumption and electricity bills. In addition, bidirectional communication is possible between local area networks or between units within a local area network, and bidirectional communication between a unit in one local area network and a unit in another local area network is also possible. Here, the unit may include a power plant, an electric company, a distributed power supply, an energy management system, an energy measurement system, an intelligent device, or an electric product. For example, bidirectional communication is possible between the power network 110 for a power plant and the home power network 130, and bidirectional communication between electrical appliances in the home power network 130 is also possible. Alternatively, bidirectional communication between a power plant in the power plant 110 for the power plant and an energy management system in the home power network 130 is also possible. Therefore, by monitoring and managing the power consumption status of each customer, it is possible to adaptive electricity production and electricity distribution.

2 is an embodiment to which the present invention is applied and shows a schematic structure of a power supply network that can use a DC power source for an electrical product while reducing AC / DC conversion loss.

As described above with reference to FIG. 1, since the power produced in a thermal power plant, a nuclear power plant, or a hydro power plant is transmitted and distributed to AC through a transmission line, power loss is further increased due to repeated AC / DC conversion several times. For example, in the case of an uninterruptible power supply with a power storage device, i.e. an uninterruptible power supply (UPS), to prevent a momentary shutdown, the AC power transmitted from the power plant is converted into a DC state by converting AC / DC to a power storage device. It is then supplied to the appliance in AC state via DC / AC conversion. In addition, the AC power supplied to the electrical appliance supplies power to the electrical appliance in a DC state through AC / DC conversion in the electrical appliance.

Therefore, it is necessary to provide DC power to the electrical appliances in order to omit the AC / DC conversion or the DC / AC conversion process that causes power loss for each electrical appliance.

In one embodiment of the present invention, a large capacity AC / DC at a local network entry point, a building entry point, a home or office entrance point so that power supplied to the local network, in a building, at home, or in an office can be provided in a DC state. By installing a converter 220, power loss due to conversion can be reduced by not using an AC / DC converter, which was required for each electrical product.

In addition, as another embodiment of the present invention, power loss due to AC / DC conversion or DC / AC conversion may be reduced by directly distributing DC power supplied from renewable energy to an electrical product. For example, since power supplied from distributed power sources and energy storage devices using solar, wind, fuel cells, and the like is a DC power source, power loss can be reduced by directly connecting the inverter to home appliances. Here, the inverter home appliance means a home appliance to which the inverter technology is applied, and an inverter means an arbitrary control of the magnitude and frequency of the voltage or current applied to the motor in order to control the speed of the motor as desired by the user. Refers to a power converter. For example, inverter air conditioners require rectification to DC for AC input, and conventional PWMs require expensive PWM (Pulse Width Modulation) rectifiers and reactors to cope with harmonics regulation. In single phase, power factor correction (PFC) module and reactor are required. In addition, software requires Power Factor Correction (PFC) control, and expensive EMI filters at the input power stage due to fast switching in Power Factor Correction (PFC) control to meet specifications. It is also necessary to install the Electro Magnetic Interference Filter.

Therefore, referring to FIG. 2, when using renewable energy sources such as solar light and wind power, DC power is output and converted to AC after step-up through a DC / DC converter 210. Therefore, a DC stage necessarily exists. In addition, if the DC stage is used in the inverter electrical products 230 and 240, a simple and inexpensive DC / DC converter 235 and 245 may be used to solve the problem due to harmonics, and an expensive EMI filter may also be used. Since it is not necessary to use the inverter, it is possible to implement an inverter electrical product without power factor compensation.

3 is an embodiment to which the present invention is applied and shows a schematic internal structure diagram of an electrical product that can be adaptively operated in a power supply network capable of supplying AC power and DC power.

As described above, in areas where DC power can be supplied directly from renewable energy sources, where both AC and DC power can be supplied, each electrical product must be operated separately from the AC power and DC power. There is. In this case, each of the electrical appliances may insert a zero crossing detection circuit into the power cord of the power supply of the electrical appliance to identify whether the power supplied is AC power or DC power. For example, referring to FIG. 3, the AC / DC adapter 310 may include a communication unit 311, a switching unit 312, a zero crossing unit 313, a control unit 314, and a voltage level identification unit 315. Can be.

The communication unit 311 transmits and receives a signal with a separate communication unit existing in an external power supply device or an electric product. For example, when the AC / DC adapter 310 is configured as a wireless device, identification information indicating whether the AC power source or the DC power source may be transmitted to a communication unit in the corresponding electrical appliance.

The AC / DC adapter 310 includes a first coupling part 301 into which an electric product is plugged in, and a second coupling part 303 coupled to the outlet 305. The first coupling part 301 and the second coupling part 303 are selectively connected by a switching part 312, and the switching part 312 is optionally the communication part 311 or the zero crossing part ( 313 may be operated.

The zero crossing unit 313 may identify whether the input voltage is an AC power source or a DC power source by detecting a time point when the input voltage becomes zero. A signal identifying that the input voltage is an AC power source or a DC power source is transmitted to the electrical appliance 300 through the control unit 314, and the electrical appliance 300 is a DC / DC converter 340 according to the identification signal. It can be operated by converting the DC voltage input through and driving the circuit based thereon.

In this case, in FIG. 3, the components of the AC / DC adapter 310 are combined, but the components need not be all combined. For example, the AC / DC adapter 310 may be configured using only the zero crossing unit 313, and a zero crossing detection circuit may be inserted into a power cord without the AC / DC adapter 310. have.

In another embodiment of the present invention, the AC / DC adapter 310 includes a voltage level identification unit 315 so that an electric product can be used regardless of the DC voltage level input in the region where the non-standardized DC voltage is supplied. can do. The voltage level identification unit 315 may be inserted into a power supply power cord end of an electrical product as shown in FIG. 3. That is, it may be included in the AC / DC adapter 310.

Alternatively, the voltage level identification unit 320 may be included in the electrical appliance 300 to identify the DC voltage level of the input voltage. The voltage level supplied by applying the identified DC voltage to the circuit in the electrical appliance 300 through the controller 330 and applying the DC / DC converter 340 to change the voltage level to be suitable for the electrical appliance is The electrical appliance 300 can also be used in other regions.

4 is an embodiment to which the present invention is applied and shows a control block diagram of a power supply network in which both an AC power supply and a DC power supply are supplied, and in which an electric product can be adaptively used in an environment in which the supplied voltage level may be different. .

The power supply network to which the present invention is applied may include a renewable energy source capable of supplying DC power, for example, solar 401, wind power 402, fuel cell 403, and the like. And, it may include a power company 404 for supplying AC power with the renewable energy source.

In this case, the DC power supplied from the renewable energy source uses a DC / DC converter 410 to apply power to an electric product without AC / DC conversion, thereby reducing power loss due to AC / DC conversion. Can be reduced. In addition, AC power supplied from the power company 404 is converted into DC power through an AC / DC converter 420 and directly provided to an electric product, thereby requiring an AC / DC converter for each electric product. By not using the power loss due to conversion can be reduced. Alternatively, the AC power supplied from the power company 404 may be left as it is to operate a circuit in the electric product through an AC / DC conversion or a DC / AC conversion process in the electric product. In addition, when the AC power is supplied to the electrical appliance, it is possible to maximize the efficiency of the electrical appliance by controlling to use the DC power through the DC / AC switching unit 430.

In addition, in areas where a non-standardized DC or AC voltage is supplied, each electrical product identifies the level of the incoming voltage and applies a DC / DC converter to the appropriate voltage level for the electrical product. The product can be used efficiently.

Meanwhile, as described above, when power is supplied from various types of distributed power sources, for example, solar, wind, fuel cells, and the like, under a power supply network that can directly apply a DC power source to an electrical product, There is a need to select an efficient DC power source. Or under a power supply network that can supply both DC and AC power, it is necessary to select a more efficient power supply. Hereinafter, an embodiment in which a more efficient power supply source may be selected under a power supply network of various environments will be described.

5 and 6 show an internal block diagram and a flow chart of an electric product for selecting a lowest charge power supply source in an embodiment to which the present invention is applied, under a power supply network capable of supplying both DC power and AC power.

Electrical appliances that use electricity in the power supply network to which the present invention is applied may be powered from a power supply in the local network or a power supply in another local network. For example, electrical appliances in a home power network can be supplied with AC power supplied from a power network for a power plant in a conventional manner, supplied with converted DC power through an AC / DC converter, or from other distributed sources. DC power may be supplied. Specifically, self-produced DC power may be supplied from a fuel cell mounted in a renewable fuel cell, a solar cell, or a plug-in hybrid electric vehicle (PHEV) in a home, or another local area network (e.g., For example, it may be supplied with DC power produced from another home power network, an office power network).

As such, since there are various power sources in the power supply network, the user can monitor the real-time power information of each power supply to select the power supply most suitable for them. Here, the power supply source includes not only a case of producing and supplying power, but also a case of preserving and supplying power supplied from another producer. For example, the power supply may include a power plant, an electric company, a fuel cell, an electric vehicle, or a power storage device. The real-time power information may include power identification information, power amount information available, power rate information, power quality information, or time information available. Therefore, the user can compare the current real-time power information of each power supply and analyze the power supply that is most suitable for the current user can be efficient power consumption.

The electrical appliance 500 to which the present invention is applied may include a power supply search unit 510, a real time power information receiver 520, a real time power information comparator 530, and a power supply selector 540.

First, the power supply search unit 510 may search whether there is a power supply available (S610). As a result of the search, it may be determined whether there are a plurality of usable power supplies (S620). As a result of the checking, when there are a plurality of available power sources, that is, when only one power source exists, the search may be performed again until another power source is found. Here, when only one power source is searched, it may mean that no other power source exists, or it may mean that another power source exists but is in an unusable state. For example, the unusable state may mean a case where the amount of stored power is insufficient to meet the current demand power, or when the electric product can use only DC power or AC power. Alternatively, if no other power source is found and only one power source is present, then only one power source may be used.

If it is determined that the plurality of power sources exist, the real-time power information receiver 520 may receive real-time power information of each of the plurality of power sources (S630). The real-time power information comparing unit 530 compares the real-time power information, and examples of the real-time power information to be compared include power identification information, power supply information, power rate information, power quality information, or power supply. Time information, and the like.

According to the comparison result, the power supply selector 540 may select the cheapest power supply or a power supply suitable for an electric product (S640). For example, real-time rate information of each power supply may be compared to select a power supply that supplies the cheapest power. As another example, the real-time power information receiver 520 may receive power identification information of each of the plurality of power sources. That is, in the case of an electric product that can use only a DC power source, the AC power supply source may be excluded from the power identification information. Then, by comparing the real-time power information of the DC power supply can select the cheapest power supply (S640).

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the equivalent scope of the claims to be described.

Claims (10)

A power receiver receiving DC power from at least one power supply;
A voltage level identification unit measuring a voltage level of the received DC power;
A first DC / DC converter for converting the measured voltage level into a voltage level of the electrical appliance when the measured voltage level is different from the voltage level of the electrical appliance; And
A control unit for operating a circuit in an electrical appliance according to the converted voltage level
Including,
The direct current power represents the direct current power supplied from the direct current power supply, or the direct current power supplied from the AC power supply is converted by the AC / DC converter, and the direct current power supplied from the direct current power supply is An electrical appliance based on a power supply network using a DC source, characterized in that it represents a boosted or stepped down DC power through a second DC / DC converter that is external to the electrical product. The method of claim 1, wherein the electrical appliance,
A real time power information receiver configured to receive power information of each power supply from a plurality of power sources when the received DC power is plural; And
Further comprising a power supply selection unit for comparing the power information to select the cheapest power supply,
The power information is an electrical appliance based on a power supply network using a DC supply source, characterized in that it comprises at least one of the amount of power supply information, power bill information, power quality information and available time information. The method of claim 1,
The AC / DC converter is an electrical appliance based on a power supply network using a DC supply source, characterized in that installed in the building entry end. The method of claim 1,
The power level identification unit is composed of a separate DC adapter, the DC adapter is connected to the plug of the electrical appliance is an electrical appliance based on a power supply network using a DC source, characterized in that coupled to the outlet. The method of claim 4, wherein the DC adapter,
A first coupling part to which the plug of the electric product is coupled;
A second coupling part coupled to the outlet; And
A control unit for transmitting a control command to the first DC / DC converter to convert the measured voltage level to a voltage level of the electrical appliance
Electrical appliances based on a power supply network using a direct current source comprising a. The method of claim 1,
The direct current power source is an electrical appliance based on a power supply network using a direct current source, characterized in that it comprises at least one of solar energy, wind energy and fuel cells. An AC / DC adapter for delivering power received within at least one power supply into an electrical appliance;
A voltage level identification unit measuring a voltage level of the transferred power;
A first DC / DC converter for converting the measured voltage level into a voltage level of the electrical appliance when the measured voltage level is different from the voltage level of the electrical appliance; And
A first control unit for operating a circuit in an electrical appliance according to the converted voltage level
Including,
The AC / DC adapter,
A zero crossing unit for identifying whether the received power is DC power or AC power;
According to the identification result, when the received power is AC power, the control command to block the transmission of the received power, and to transmit the received power to the electrical product when the received power is DC power; A second control unit for transmitting to the voltage level identification unit,
The direct current power indicates a direct current power supplied from a direct current power supply, and the direct current power supplied from the direct current power supply indicates a direct current boosted or stepped down by a second DC / DC converter existing outside the electrical appliance. Electrical appliances based on a power supply network using a direct current source. The method of claim 7, wherein the electrical appliance,
A real time power information receiver configured to receive power information of each power supply from a plurality of power sources when the received DC power is plural; And
Comprising a power supply source selection unit for comparing the power information to select the cheapest power supply,
The power information is an electrical appliance based on a power supply network using a DC supply source, characterized in that it comprises at least one of the amount of power supply information, power bill information, power quality information and available time information. The method of claim 7, wherein the AC / DC adapter,
A first coupling part to which the plug of the electric product is coupled;
A second coupling part coupled to the outlet; And
A switching unit which cuts off or transfers the received power according to a control command of the second controller;
Electrical appliances based on a power supply network using a direct current source, characterized in that it further comprises. The method of claim 7, wherein
The direct current power source is an electrical appliance based on a power supply network using a direct current source, characterized in that it comprises at least one of solar energy, wind energy and fuel cells.

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