KR20180022089A - Flush receptacle providing direct current output and direct current power supplying system comprising thereof - Google Patents

Abstract

The present invention provides a flush receptacle device for providing a DC output and a direct current power supplying system comprising the same. According to the present invention, the flush receptacle device comprises: a housing configured to form an external shape of the flush receptacle device; an input unit formed on one side of the housing and configured to receive direct current power; a first output unit formed on the other side of the housing and configured to output first direct current power based on the direct current power; a first conversion unit installed in the housing or on one side of the housing and configured to convert the direct current power into alternating current power; and a second output unit formed on the other side of the housing and electrically connected to the first conversion unit to output the alternating current power. Therefore, the flush receptacle device can minimize power loss due to power conversion so as to increase efficiency of using power.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flush receptacle device for providing a DC output, and a DC power supply system including the flush receptacle device.

The present invention relates to a flush-type receptacle device for providing a DC output and a DC power supply system including the flush-type receptacle device.

As the demand for electric power is gradually increasing due to economic / industrial development, researches on electric power production using new and renewable energy have been actively carried out in order to improve power use efficiency. However, since the power generated using renewable energy is direct current (DC), the present power supply facility is constructed based on an alternating current (AC) voltage of 220 V, .

DC converter, which is built in a household flush-type socket-outlet and can be exchanged, is provided with 220V A DC converter module having a structure for converting AC power input through an input terminal to DC 5 V and outputting the AC voltage through a plurality of USB ports and a 2.5-port port. However, in case of using renewable energy, in order to provide an input voltage of 220 VAC to a household flush-type outlet, DC power produced based on renewable energy needs to be converted to 220 VAC power, and 220 VAC power is supplied to 5 VDC power So that a lot of power is lost in such a power conversion process. Therefore, there is a need for a method that can use DC power more efficiently.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flush-type receptacle device capable of increasing power use efficiency.

Another aspect of the present invention is to provide a DC power supply system capable of increasing power usage efficiency.

According to one aspect of the present invention, a flush-type receptacle device includes a housing forming an external shape of the flush-type receptacle device, an input part formed at one side of the housing and receiving a DC power, A first converter for converting a DC power supplied from the input unit into an AC power, the first converter being disposed on the inside of the housing or on one side of the housing, And a second output unit electrically connected to the first conversion unit to output the AC power.

According to one aspect of the present invention, the flush-type receptacle device includes a second conversion unit provided inside the housing or on one side of the housing and converting the direct current power into second direct current having a voltage lower than the voltage of the first direct current power, And a third output unit that is formed on the other side of the first conversion unit and is electrically connected to the second conversion unit to output the second DC power.

According to another aspect of the present invention, the flush-type receptacle device is provided inside the housing or on one side of the housing and controls the voltage of the second direct-current power that is electrically connected to the second conversion unit and output through the third output unit And may further include a control unit.

According to another aspect of the present invention, the control unit may adjust the output voltage of the second conversion unit according to the request voltage information when a signal including the request voltage information is received from the power receiving apparatus connected to the third output unit.

According to another aspect of the present invention, the control unit controls the second DC power to be output as a reference voltage when the power reception unit is connected to the third output unit, and when the request voltage information is received from the power reception unit, The target voltage may be set according to the voltage information and the current output voltage may be stepped up or down until the current output voltage of the second conversion unit reaches the target voltage.

According to another aspect, the control unit may receive a signal including the required voltage information from the power receiving unit through power line communication.

According to another aspect of the present invention, the flush-type receptacle device is provided inside the housing or on one side of the housing, and whether or not the power reception device is connected to at least one of the first output portion, the second output portion and the third output portion And a sensing unit that senses the sensing signal.

According to another aspect, the sensing unit may include at least one current sensor or a voltage sensor.

According to another aspect of the present invention, the flush-type receptacle device is provided on the inside of the housing or on one side of the housing, and is electrically connected to the input unit, so that at least one of the first output unit, the second output unit, And a switch unit for supplying electric power through the switch unit.

According to another aspect of the present invention, the controller may control the switching operation of the switch unit based on a sensing signal from the sensing unit.

According to another aspect of the present invention, the flush-type receptacle device is provided on the other side of the housing and is electrically connected to the switch portion to determine whether power is output from each of the first output portion, the second output portion and the third output portion And a display unit for displaying information on the display unit.

According to another aspect, the display unit may include at least one LED (Light Emitting Diode).

According to another aspect of the present invention, a direct current power supply system includes a power generation device that generates power by converting at least one of solar energy, wind energy, and thermal energy into electric energy, a power generation device A first output unit for outputting first DC power based on the DC power, and a second output unit for outputting the first DC power based on the DC power, And a second output unit that is electrically connected to the first conversion unit and outputs the AC power. The first conversion unit converts the AC power into AC power, and the second output unit outputs the AC power.

According to another aspect of the present invention, a flush-type receptacle device includes a housing forming an external shape of the flush-type receptacle device, an input part formed at one side of the housing and receiving a DC power, A first output unit for outputting a first direct current power to the housing or a first output unit for converting a direct current power supplied from the input unit to an inside of the housing or one side of the housing to a second direct current power having a voltage lower than the voltage of the first direct current power And a second output unit that is formed on the other side of the housing and is electrically connected to the conversion unit and outputs the second DC power.

According to the present invention, since the power loss due to the power conversion can be minimized, the power use efficiency is increased.

1 is a diagram showing an example of a DC power supply system according to the present invention.
2 is a perspective view showing a flush-type receptacle apparatus according to an embodiment of the present invention.
3 is a block diagram showing the flush-type receptacle apparatus according to Fig.
4 is a perspective view showing a flush-type receptacle apparatus according to another embodiment of the present invention.
Fig. 5 is a block diagram showing the flush-type receptacle apparatus according to Fig.
6 is a flowchart illustrating a voltage control method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms "to" and the like described in the specification mean a unit for processing at least one function or operation, which can be implemented by hardware, software, or a combination of hardware and software.

1 is a diagram showing an example of a DC power supply system according to the present invention.

Referring to FIG. 1, a DC power supply system 100 according to the present invention may include a power generation device 110, a power storage device 150, and an outlet device 200. In FIG. 1, the DC power supply system 100 is illustrated as being installed indoors, but the DC power supply system 100 according to the present invention may be installed indoors as well as indoors.

In FIG. 1, the power generation apparatus 110, the power storage apparatus 150, the power storage apparatus 150, and the receptacle apparatus 200 may be electrically connected to each other by a DC grid. Wherein the direct current wiring may be a smart grid including a communication network. DC wiring is low in power loss due to power conversion, resulting in high energy efficiency and high-quality power supply.

The power generation device 110 generates direct current (DC) power by converting at least one of solar energy, wind energy, and thermal energy into electric energy. For example, the power generation apparatus 100 may include a solar cell that converts solar energy into electrical energy, a wind power generator that converts wind energy into electrical energy, And a geothermal power generator.

The power storage device 150 stores the power generated by the power generation device 110 and / or the power supplied from the power supply 120.

The receptacle apparatus 200 is for providing the power stored in the power storage device 150 and / or the power supplied from the power supply source 120 to the power receiving apparatus (load), and the power storage apparatus 150 And a power supply source 120, a first output unit for outputting first DC power based on the DC power, a DC power supply unit for converting the DC power supplied from the input unit into AC power, And a second output unit that is electrically connected to the first conversion unit and outputs the AC power. Wherein the first output is for an electronic device requiring direct current power as input power and the second output may be for compatibility with an electronic device requiring alternating current (AC) power as input power. Also, the receptacle device 200 may supply the DC power from the power storage device 150 and / or the power source 120 to the power source 120 for the electronic device requiring low-voltage DC power, 2 DC power, and a third output unit electrically connected to the second conversion unit and outputting the second DC power.

Meanwhile, the receptacle device 200 may further include a sensing unit for sensing whether or not the power reception device is connected to at least one of the first output unit, the second output unit, and the third output unit. Also, the receptacle device 200 is electrically connected to the input unit, and power is supplied through at least one of the first output unit, the second output unit, and the third output unit based on a sensing signal from the sensing unit. And a switch unit for allowing the switch to be turned on. In this case, the receptacle apparatus 200 can prevent the risk of electric shock by supplying power to the output unit only when insertion of a plug of the receptacle into the output unit is detected. In addition, power is supplied to the output unit only when power supply is required, so that standby power, that is, power consumed in maintaining the ready state before the water receiving apparatus is normally operated can be cut off.

1, the DC power supply system 100 includes only one receptacle device 200. However, in the DC power supply system 100, a plurality of receptacle devices similar to the receptacle device 200 are provided, . Although not shown in FIG. 1, the DC power supply system 100 according to the present invention includes a control unit (not shown) for controlling the voltage of the second direct current power, which is electrically connected to the first conversion unit and output through the second output unit, . ≪ / RTI > Here, the control device may be included in the receptacle device 200 as required. For example, when the signal including the required voltage information is received from the power receiving apparatus connected to the third output section of the receptacle apparatus 200, the control apparatus controls the second converting section So that the output voltage at the output terminal can be adjusted adaptively. To this end, the control device controls the second DC power to be output at a reference voltage (for example, 5 V) when the water receiving apparatus is initially connected to the third output section of the receptacle apparatus 200, When a signal including the required voltage information is received, the target voltage can be set according to the required voltage information. And the present output voltage can be stepped up or down until the voltage currently output by the second converter of the receptacle apparatus 200 reaches the target voltage. Here, the control device may receive a signal including the required voltage information from the power receiving device through power line communication (PLC). In this case, the DC power supply system 100 according to the present invention can interwork with a home network through a PLC or configure a home network based on a power line. In this case, the control device may control the operation of the home network.

Hereinafter, the case where the receptacle device 200 is constituted by a flush-type receptacle device and the above-described control device is provided in the receptacle device 200 will be described in more detail.

2 is a perspective view showing a flush-type receptacle apparatus according to an embodiment of the present invention.

2, the flush-type receptacle apparatus 200 according to the present invention includes a housing 210, an input unit (not shown), a first output unit 220, and a second output unit 230 ).

The housing 210 forms the outer shape of the flush-type receptacle device 200.

The input unit may be formed on one side of the housing 210. DC power may be input to the input unit through the DC wiring. For example, the input unit may be formed on the back surface of the flush-type receptacle apparatus 200 and may include at least one input terminal for inputting a DC power source.

The first output unit 220 may be formed on the other side (for example, the front side) of the housing 210 and may output the first DC power based on the DC power input through the input unit. Here, the voltage of the first DC power may be the same level as the DC power input through the input unit. The voltage of the first DC power may be a high voltage, for example, 350 VDC, 380 VDC, or the like.

The second output unit 230 may be formed on the other side of the housing 210 or on one side thereof, like the first output unit 220. The second output unit 230 outputs AC power based on the DC power inputted through the input unit. To this end, a conversion unit (not shown) may be provided on the inside of the housing 210 or on one side of the housing 210. The conversion unit may be electrically connected to the input unit and the second output unit 230 to convert the DC power supplied from the input unit to AC power and provide the DC power to the second output unit 230. The converting unit may be, for example, a DC-AC converter that converts DC power into AC power.

Although the first output unit 220 and the second output unit 230 are shown as one output terminal in FIG. 2, the first output unit 220 and the second output unit 230 May each be constituted by one or more output terminals. Although not shown in FIG. 2, the flush-type receptacle device 200 may be provided with a protection circuit for protection against overcurrent, overvoltage, overload, and the like.

3 is a block diagram showing the flush-type receptacle apparatus according to Fig.

Hereinafter, the flush-type receptacle apparatus according to the first embodiment will be described in more detail with reference to Fig.

3, the flush-type receptacle apparatus according to the first embodiment of the present invention includes an input unit 310, a switch unit 320, a first output unit 330, a conversion unit 340, a second output unit 350 ), A sensing unit 360, and a control unit 370.

The input unit 310 is formed on one side of the housing of the flush-type receptacle device and can receive DC power from a power storage device, a power supply source, or the like.

The switch unit 320 is provided inside or on the housing and is electrically connected to the input unit 310 through a power line so as to switch or cut off the supply of the DC power. For this purpose, the switch unit 320 may include at least one switch.

The first output unit 330 is formed on the other side of the housing and outputs the first DC power of high voltage based on the DC power supplied through the input unit 310 and the switch unit 320. Here, the high voltage may mean a voltage of 100V or more, for example, 300VDC, 350VDC, 380VDC, and the like.

The converting unit 340 may convert DC power supplied to the inside or one side of the housing through the input unit 310 and the switch unit 320 to AC power. The voltage level of the AC power may be the same level as the DC power.

The second output unit 350 is formed on the other side of the housing and is electrically connected to the converting unit 340 to output AC power supplied from the converting unit 340.

The sensing unit 360 may be provided inside or on a side of the housing of the flush-type receptacle device to sense whether the power reception device is connected to at least one of the first output unit 330 and the second output unit 350. To this end, the sensing unit 360 may comprise at least one current sensor and / or a voltage sensor and may be connected to the first output unit 330 and / or the second output unit 350 via a power line and / have.

The control unit 370 may be provided inside or on the housing and may be electrically connected to the sensing unit 360 to control the switching operation of the switch unit 320 based on a sensing signal from the sensing unit 360.

4 is a perspective view showing a flush-type receptacle apparatus according to another embodiment of the present invention.

4, the flush-type receptacle apparatus 400 according to the present invention includes a housing 410, an input unit (not shown), a first output unit 420, a second output unit 430, A third output unit 440, 440 ', and a display unit 450. [

In the second embodiment, the structure of the housing 410, the input unit, the first output unit 420, and the second output unit 430 are the same as those in the first embodiment, and a description thereof will be omitted.

The third output units 440 and 440 'are for supplying power to electronic devices requiring low voltage DC power as input power and are formed on the same surface as the first output unit 420 and the second output unit 430 Thereby outputting DC power of low voltage. To this end, the output terminals of the third output units 440 and 440 'may be implemented as a USB type-C (Universal Serial Bus Type C) supporting power transmission of 20V and 5A, for example. Although not shown in FIG. 4, in addition to a first converter for converting a high-voltage direct-current power input through the input unit into alternating-current power, the high-voltage direct-current power is converted into a low- And a second conversion unit for converting the output of the first conversion unit. The second conversion unit may be a DC-DC converter, for example.

Although not shown in FIG. 4, the flush-type receptacle apparatus 400 according to the second embodiment may also include a control unit, a switch unit, and a sensing unit as in the first embodiment.

The display unit 450 is provided on the other side of the housing 410 and is electrically connected to the switch unit so that the first output unit 420, the second output unit 430, and the third output units 440 and 440 ' Information about whether or not power is output in the display unit 100 may be displayed. For this, the display unit 450 may include at least one LED (Light Emitting Diode). DC power may be supplied to or cut off from the display unit 450 according to the switching state of the switch unit, thereby indicating to which output unit the power is output.

4, the first output unit 420 and the second output unit 430 are constituted by one output terminal and the third output units 440 and 440 'are constituted by two output terminals. The first to fourth output units 420 to 440 'may be configured as one or more output terminals. Also, the flush-type receptacle apparatus 400 according to the second embodiment may be provided with a protection circuit for protection against overcurrent, overvoltage, overload and the like.

Fig. 5 is a block diagram showing the flush-type receptacle apparatus according to Fig.

Hereinafter, the flush-type receptacle apparatus according to the second embodiment will be described in more detail with reference to Fig.

5, the flush-type receptacle device according to the second embodiment of the present invention includes an input unit 510, a switch unit 520, a first output unit 530, a first conversion unit 540, A second conversion unit 560, a third output unit 570, a sensing unit 580, a control unit 590, and a display unit 595, as shown in FIG.

The input unit 510 may be formed at one side of the housing of the flush-type receptacle apparatus and receive DC power from the power storage device, the power supply source, or the like.

The switch unit 520 is provided inside or on the housing of the flush-type receptacle apparatus and is electrically connected to the input unit 510 through a power line so that the DC power is supplied to the first output unit 530, the second output unit 550, 3 output unit 570, as shown in FIG. For this, the switch 520 may include a plurality of switches.

The first output unit 530 is formed on the other side of the housing and outputs a first DC power of a high voltage (for example, 300 V or more) based on the DC power supplied through the input unit 510 and the switch unit 520 .

The first conversion unit 540 may be disposed inside or on one side of the housing to convert the DC power supplied from the input unit 510 into AC power. Here, the voltage of the AC power may be equal to the voltage level of the DC power. Alternatively, the first converter 540 may convert the DC power into AC power having a preset voltage such as 200 VAC, 110 VAC, 100 VAC, or the like.

The second output unit 550 may be formed on the other side of the housing and may be electrically connected to the first conversion unit 540 to output AC power supplied from the first conversion unit 540.

The second conversion unit 560 may convert the DC power supplied through the input unit 510 and the switch unit 520 to a second direct current power having a voltage lower than the first direct current power (for example, , 3.6V to 20V). The second conversion unit 560 may adaptively adjust the output voltage within a variable voltage range.

The third output unit 570 is formed on the other side of the housing and is electrically connected to the second conversion unit 560 and outputs second DC power supplied from the second conversion unit 560.

The sensing unit 580 may be provided inside or on one side of the housing of the flush-type receptacle apparatus so as to detect whether the power reception apparatus is connected to at least one of the first output unit 530 to the third output unit 570. For this purpose, the sensing unit 580 may comprise at least one current sensor and / or voltage sensor, and may include a first output 530, a second output 550, a third output 570, and / And may be connected to the control unit 590 through a power line and / or a communication line, respectively.

The control unit 590 is provided inside or on one side of the housing and is electrically connected to the switch unit 520, the second conversion unit 560 and the sensing unit 580 and includes a first output unit 530, The switching unit 520 controls the switching operation of the switch unit 520 using the switching control signal based on the sensing signal from the sensing unit 580 so that power is output or interrupted at each of the first output unit 550 and the third output unit 570, 2 conversion unit 560. [0064] FIG.

For example, when receiving a signal including the required voltage information from the water receiving apparatus in a state where the water receiving apparatus is connected to the third output unit 570, the control unit 590 controls the second converting unit 560 Can be adjusted. Here, the communication between the control unit 590 and the water receiving apparatus may be a PLC. That is, the signal including the required voltage information may be transmitted from the power receiving apparatus to the control unit 590 through the power line. The signal including the required voltage information may be transmitted from the power receiving apparatus to the control unit 590 through a separate communication line.

On the other hand, when the signal including the required voltage information is received, the control unit 590 may transmit the voltage control signal according to the required voltage information to the second conversion unit 560 using the power line and / or the communication line. The control unit 590 may control the switch unit 520 to output DC or AC power through the corresponding output unit when the sensing unit 580 receives the sensing signal. If the detection signal is a signal indicating that the plug is detected at the third output unit 570, the controller 590 controls the DC power of the reference voltage to be output through the third output unit 570, It is possible to wait for a predetermined period of time to receive the signal including the required voltage information of the terminal. If a signal including the required voltage information is received from the power reception device, the controller 590 sets the target voltage according to the required voltage information. The current output voltage may be stepped up or down until the current output voltage of the second converter 560 reaches the target voltage. For example, the control unit 590 may control the DC power to be output to the reference voltage of 5VDC when the water receiving apparatus is connected to the third output unit 570. Thereafter, the control unit 590 sets the output voltage of the second conversion unit 560 to 9V and outputs the DC power at 9V from the second conversion unit 560 when the voltage requirement information for 9V is received from the water receiving apparatus The output voltage of the second converter 560 may be controlled to be increased by a predetermined level until the output voltage of the second converter 560 increases. For example, the control unit 590 may gradually increase or decrease the output voltage of the second conversion unit 560 by 200 mV.

As another example, the control unit 590 may include a predetermined interface. In this case, the control unit 590 can receive the set value of the output voltage of the third output unit 570 from the user through the interface. For example, when the user sets the target voltage via the interface, the control unit 590 can control the output voltage of the second conversion unit 560 to gradually increase or decrease until the output voltage reaches the target voltage .

The display portion 595 may be provided on the other side of the housing. The display unit 595 includes at least one LED electrically connected to the switch unit 520 so that power is supplied to the first output unit 530, the second output unit 550 and the third output unit 570, It is possible to display information on whether or not it is outputted.

Meanwhile, the sensing unit 580, the control unit 590, and / or the display unit 595 may receive the DC power necessary for performing the above-described operation from the second conversion unit 560. To this end, the second conversion unit 560 includes a first converter (not shown) for supplying the second DC power to the third output unit 570, a sensing unit 580, a control unit 590, and / (Not shown) for supplying the driving power to the first power source 595. In this case, the output voltage from the first converter and the output voltage from the second converter may be different from each other. The output voltage from the second converter may be fixed, for example, to 5VDC, 12VDC, and the like.

Although the above embodiment has been described with respect to the flush-type receptacle device capable of outputting both the direct-current power and the alternating-current power, the flush-type receptacle device according to the present invention may be of a form capable of outputting only the direct- May be implemented in a printable form. That is, the flush-type receptacle device according to the present invention can be implemented in a form in which only one output portion of the first to third output portions is included, or a combination of any two output portions, if necessary.

6 is a flowchart illustrating a voltage control method according to an embodiment of the present invention.

Hereinafter, with reference to FIG. 6, a method of controlling the output voltage of the second converter (DC-DC converter) according to the present invention will be described in detail.

The control unit controls the DC power to be output to the reference voltage when the connection of the plug is detected at the output terminal (S610).

Thereafter, when a signal including the required voltage information is received from the power receiving device through the plug (S620), a target voltage is set according to the required voltage information (S630), and a conversion unit And controls to output the target voltage (S640).

For example, when the reference voltage is 5VDC and the target voltage is 12VDC, the control unit may transmit a voltage increase request signal to the converting unit until the current output voltage of the converting unit reaches 12VDC. In this case, the conversion unit may increase the output voltage by 200 mV each time the voltage increase request signal is received. Alternatively, the control unit may transmit to the conversion unit a voltage control signal instructing to convert the output power at a power of 12 VDC. In this case, the converter may set the target voltage to 12VDC based on the voltage control signal, and increase the output voltage by 200mV until the current output voltage reaches the target voltage.

If the output voltage of the current conversion unit is 20VDC and the target voltage is 5VDC, that is, when the DC power output through the current output unit is 20VDC, the power reception apparatus will transmit DC power of 5VDC to prevent overheating If requested, the control unit may transmit a voltage drop control signal to the converting unit until the current output voltage at the converting unit reaches 5VDC. In this case, the converting unit may lower (or decrease) the output voltage by 200 mV each time the voltage lowering control signal is received. Alternatively, the control unit may transmit to the conversion unit a voltage control signal instructing to convert the output power at a power of 5VDC. In this case, the converting unit may set the target voltage to 5VDC based on the voltage control signal, and may lower the output voltage by 200mV until the current output voltage reaches the target voltage.

Thereafter, if it is determined that the current output voltage has reached the target voltage (S650), the controller can control to maintain the current output voltage.

The above description is only illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

200: outlet device
210: Housing
220: first output terminal
230: second output terminal

Claims (21)

In a flush-type receptacle device,
A housing forming an outer shape of the flush-type receptacle device;
An input unit formed at one side of the housing and receiving a DC power;
A first output unit formed on the other side of the housing and outputting first DC power based on the DC power;
A first converting unit provided on the inside of the housing or on one side of the housing for converting a DC power supplied from the input unit into AC power; And
And a second output unit that is formed on the other side of the housing and is electrically connected to the first conversion unit to output the AC power,
Wherein the receptacle-type receptacle device comprises: The method according to claim 1,
A second converter which is disposed inside the housing or on one side of the housing and converts the DC power into second DC power having a voltage lower than the voltage of the first DC power; And
Further comprising a third output unit formed on the other side of the housing and electrically connected to the second conversion unit to output the second DC power. 3. The method of claim 2,
And a controller for controlling a voltage of the second direct current power that is provided inside the housing or on one side of the housing and that is electrically connected to the second converter and is output through the third output unit A flush receptacle device. The method of claim 3,
Wherein,
And adjusts the output voltage of the second conversion unit according to the required voltage information when a signal including the required voltage information is received from the power receiving apparatus connected to the third output unit. 5. The method of claim 4,
Wherein,
Controls the second DC power to be output as a reference voltage when the power reception apparatus is connected to the third output section and sets the target voltage according to the required voltage information when the power supply apparatus receives the required voltage information Wherein the current output voltage is stepped up or down until the current output voltage of the second conversion unit reaches the target voltage. 5. The method of claim 4,
Wherein,
And receives a signal including the required voltage information from the power reception device through power line communication. 3. The method of claim 2,
And a sensing unit provided on the inside of the housing or on one side of the housing for sensing whether the power reception device is connected to at least one of the first output unit, the second output unit and the third output unit To the ground. 8. The method of claim 7,
The sensing unit includes:
And at least one current sensor or voltage sensor. 8. The method of claim 7,
A switch unit provided in the housing or on one side of the housing and electrically connected to the input unit to supply power through at least one of the first output unit, the second output unit, and the third output unit Wherein the recessed socket-type socket is provided with a recessed socket. 10. The method of claim 9,
Wherein,
Wherein the control unit controls the switching operation of the switch unit based on a sensing signal from the sensing unit. 11. The method of claim 10,
And a display unit that is provided on the other side of the housing and is electrically connected to the switch unit and displays information on whether power is output from each of the first output unit, the second output unit, and the third output unit Wherein the plug-in receptacle is a plug-in receptacle. 12. The method of claim 11,
The display unit includes:
And at least one light emitting diode (LED). In a DC power supply system,
A power generation device that generates power by converting at least one of solar energy, wind energy, and thermal energy into electrical energy;
A power storage device for storing power supplied from the power generation device and the power supply; And
An input unit for receiving a DC power supplied from at least one of the power storage device and the power supply source, a first output unit for outputting first DC power based on the DC power supply, a DC power supply for converting the DC power supplied from the input unit into AC power And a second output unit that is electrically connected to the first conversion unit and outputs the AC power,
And a DC power supply. 14. The method of claim 13,
The receptacle device includes:
A second converter for converting the DC power to a second DC power lower than a voltage of the first DC power; And
And a third output unit electrically connected to the second conversion unit to output the second DC power. 14. The method of claim 13,
Further comprising a control unit electrically connected to the second conversion unit to control a voltage of the second DC power output through the third output unit. 16. The method of claim 15,
The control device includes:
Wherein the control unit controls the output voltage of the second conversion unit according to the request voltage information when a signal including the request voltage information is received from the power receiving apparatus connected to the third output unit. 17. The method of claim 16,
The control device includes:
Controls the second DC power to be output as a reference voltage when the power reception apparatus is connected to the third output section and sets the target voltage according to the required voltage information when the power supply apparatus receives the required voltage information Wherein the current output voltage is stepped up or down until the current output voltage of the second converter reaches the target voltage. 16. The method of claim 15,
The control device includes:
And receives a signal including the required voltage information from the power receiving unit through power line communication. 19. The method of claim 18,
The receptacle device includes:
Further comprising a sensing unit for sensing whether the power reception device is connected to at least one of the first output unit, the second output unit, and the third output unit. 19. The method of claim 18,
The receptacle device includes:
And a switch unit electrically connected to the input unit to supply power through at least one of the first output unit, the second output unit and the third output unit based on a sensing signal from the sensing unit Features a DC power supply system. In a flush-type receptacle device,
A housing forming an outer shape of the flush-type receptacle device;
An input unit formed at one side of the housing and receiving a DC power;
A first output unit formed on the other side of the housing and outputting first DC power based on the DC power;
A converter disposed in the housing or on one side of the housing for converting a DC power supplied from the input unit into a second DC power having a voltage lower than the voltage of the first DC power; And
And a second output unit which is formed on the other side of the housing and is electrically connected to the converting unit to output the second DC power,
Wherein the receptacle-type receptacle device comprises:

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