KR101903850B1 - Multi outlet using direct current power - Google Patents

Abstract

A multi-receptacle device using DC power is provided. According to another aspect of the present invention, there is provided a multi-receptacle device comprising: a housing forming an outer shape of the multi-receptacle device; an input part provided at one side of the housing to receive a DC power; A first converting unit provided in the housing to convert the DC power into AC power, and a second converting unit provided on the housing and electrically connected to the first converting unit, And a second output unit for outputting the output signal.

Description

[0001] MULTI OUTLET USING DIRECT CURRENT POWER [0002]

The present invention relates to a multi-receptacle device capable of inputting and outputting DC power.

As the kinds of electronic devices are diversified due to the development of industry / technology, there is an increasing need to supply electric power to a plurality of electronic devices at the same time. To this end, multi-receptacle devices are frequently used.

A multi-receptacle device is a mobile receptacle device capable of inserting a plurality of plugs, and is generally connected to a fixed receptacle such as a flush-type receptacle or another multi-receptacle device and receives AC (Alternating Current) power. And distributes the AC power from the output terminals included in the multi-receptacle device so that the AC power can be outputted simultaneously. However, recently, as the number of electronic apparatuses that require DC power as input power increases, the usage rate of adapters for converting AC power into DC power is also increasing. However, since the voltage / current required for each electronic device is different from each other and the size and type of the adapter used for each electronic device are different from each other, it is inconvenient to connect a plurality of adapters to one multi-outlet device, An economical burden arises in providing an adapter corresponding to each adapter.

In order to solve such a problem, for example, in a multi-socket outlet equipped with a DC converter, a regenerative multifunctional plug connector 20-0198500 (registered on July 24, 2000) . However, even if the multi-receptacle is equipped with the DC converter, it is only possible to supply the current electric power to only a specific type of electronic device, and when it is desired to connect an electronic device requiring different voltage and / or electric power to the electronic device, An adapter is required that can supply power at the voltage and / or current required by the device.

In addition, as the demand for electricity has recently increased, the amount of electricity produced by new and renewable energy has been increasing. However, the power generated from renewable energy is direct current (DC) In order to supply AC power to the multi-outlet device, it is necessary to convert the DC power produced by the renewable energy into AC power (DC to AC) and supply it again to the electronic device requiring DC power again DC to AC (DC to AC), and in this process a lot of power is lost.

In addition, even when DC power is transmitted from a power plant and DC power distribution is installed in a home or a building, in order to use an existing multi-outlet device, DC power supplied from a flush-type outlet is converted into AC power A separate adapter is required, which must be converted to DC power in order to supply it back to the electronic device requiring DC power again, so too much power is lost in the power conversion process.

SUMMARY OF THE INVENTION The present invention provides a multi-receptacle device capable of increasing power usage efficiency.

Another object of the present invention is to provide a multi-receptacle device that can be used more conveniently and safely.

According to an aspect of the present invention, a multi-receptacle device includes a housing forming an outer shape of the multi-receptacle device, an input part provided at one side of the housing to receive a DC power, A first conversion unit provided in the housing to convert the DC power into AC power, and a second conversion unit provided on the housing and electrically connected to the first conversion unit, And a second output unit for outputting the AC power.

According to one aspect, the input section may include a DC plug for electrical contact with an external receptacle providing the DC power source, and a cable for connection between the DC plug and the housing.

According to another aspect of the present invention, the multi-receptacle device includes a second conversion unit provided in the housing and converting the direct current power into a second direct current power having a voltage lower than a voltage of the first direct current power, And a third output unit electrically connected to the second conversion unit to output the second DC power.

According to another aspect, the first output unit includes at least one DC output terminal, the second output unit includes at least one AC output terminal, and the third output unit includes at least one USB (Universal Serial Bus) Output terminal.

According to another aspect of the present invention, the multi-receptacle apparatus further includes a control unit provided in the housing and electrically connected to the second conversion unit to control a voltage of the second DC power outputted through the third output unit can do.

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 multi-receptacle apparatus is electrically connected to at least one of the first output unit, the second output unit, and the third output unit, and detects whether or not the water receiving apparatus is connected to the output unit And the like.

According to another aspect of the present invention, the multi-receptacle apparatus further includes a switch unit provided on the housing and electrically connected to the input unit to switch or cut off the supply path of the DC power supply.

According to another aspect of the present invention, the switching unit may include: a main switch electrically connected to the input unit to supply the DC power or cut off the supply of the DC power; a second switch located between the main switch and the output terminal of the first output unit, A first switch for outputting the first direct current power or for interrupting the output of the first direct current power, a second switch for switching the output of the alternating current power And a third switch which is located between the main switch and the output terminal of the third output section and outputs the second DC power or blocks the output of the second DC power.

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

According to another aspect of the present invention, there is provided a multi-receptacle apparatus comprising: a housing forming an outer shape of the multi-receptacle apparatus; an input unit provided at one side of the housing to receive a DC power source; A converter 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, the first DC power output unit outputting a first DC power; And a second DC power output unit formed on the other side of the housing and electrically connected to the conversion unit to output the second DC power.

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

Further, according to the present invention, since a separate adapter is unnecessary and power is outputted adaptively, it is possible to use the multi-receptacle device more conveniently and safely.

1 is a perspective view illustrating a multi-receptacle apparatus according to an embodiment of the present invention.
2 is a block diagram showing a multi-receptacle apparatus according to the embodiment of FIG.
3 is a perspective view showing a multi-receptacle apparatus according to another embodiment of the present invention.
4 is a block diagram showing a multi-receptacle apparatus according to the embodiment of FIG.
5 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 perspective view illustrating a multi-receptacle apparatus according to an embodiment of the present invention.

1, a multi-receptacle apparatus 100 according to a first embodiment of the present invention includes a housing 110, an input terminal 120, a main switch 130, at least one first output And may include terminals 140 and 140 ', at least one second output terminal 150 and 150', and a plurality of individual switches 160 for switching outputs of the respective output terminals.

The housing 110 forms the contour of the multi-receptacle device 100.

The input terminal 120 is for electrical contact with an external socket (not shown) that provides a DC power source, and may be constituted by a DC plug, for example, as shown in FIG. The input terminal 120 may be connected to the housing 110 through a cable provided at one side of the housing 110. The multi-outlet device 100 can receive DC power from an external outlet through an input terminal 120 and a cable.

The main switch 130 may be electrically connected to the input terminal 120 through the cable. The main switch 130 may supply the DC power to the multi-outlet apparatus 100 through the switching operation, or may block the supply of the DC power.

The first output terminals 140 and 140 'are for an electronic device requiring direct current power as input power. The first output terminals 140 and 140' are formed on the upper side of the housing 110, DC power can be output. Here, the voltage of the first DC power outputted through the first output terminals 140 and 140 'may be the same level as the voltage of the DC power inputted through the input holder 120. For example, the voltage of the first DC power may be a high voltage (350 VDC, 380 VDC, etc.) of 100 VDC or more.

The second output terminals 150 and 150 'are provided for the purpose of compatibility with electronic devices requiring AC power as input power. The second output terminals 150 and 150' are formed on the upper side of the housing 110, So that AC power can be output. To this end, a conversion unit (not shown) may be provided inside the housing 110. The conversion unit may convert the DC power supplied through the input terminal 120 into AC power and provide the AC power to the second output terminal 150 or 150 '. For example, the converter may be a DC-AC converter that converts DC power to AC power.

The individual switches 160 may be provided corresponding to the respective output terminals on the upper side of the housing 110. The individual switches 160 can block power from being output or from being output from an output terminal corresponding to each switch

1, the multi-receptacle apparatus 100 includes two first output terminals 140 and 140 'and two second output terminals 150 and 150'. However, the first output terminal 140 and the second output terminals 150 and 150 ' 140, and 140 'and the second output terminals 150 and 150' may be configured as one or more output terminals as necessary. Although not shown in FIG. 1, the multi-receptacle apparatus 100 may further include a protection circuit for protecting it from overcurrent, overvoltage, overload, and the like.

2 is a block diagram showing a multi-receptacle apparatus according to the embodiment of FIG.

Hereinafter, the multi-receptacle apparatus according to the first embodiment will be described in more detail with reference to FIG.

2, the multi-receptacle apparatus according to the first embodiment of the present invention includes an input terminal 210, a main switch unit 220, a first switch 230, a first output terminal 235, The third switch 260, the second output terminal 245, the converter 250, the third switch 260, the third output terminal 265, the fourth switch 270 and the fourth output terminal 275 have.

The input terminal 210 may be formed on one side of the housing of the multi-receptacle device to receive DC power from an external outlet.

The main switch 220 is provided inside the housing and can be electrically connected to the input terminal 210 through a power line. The main switch 220 may be configured such that the DC power input through the input terminal 210 is supplied to each of the output terminals 235, 245, 265, and 275, respectively.

The first switch 230 and the second switch 240 are controlled such that the DC power supplied through the main switch 220 is output through the first output terminal 235 and the second output terminal 245, can do. Therefore, the first output terminal 235 and the second output terminal 245 are DC output terminals, and the direct current power output therefrom does not undergo a separate DC-AC conversion and / or AC-DC conversion process, Is minimized.

The converter 250 is provided for an electronic device using AC power and can convert a DC power supplied to the inside or the one side of the housing through the main switch 220 to an AC power of the same level as the DC power .

The third switch 260 and the fourth switch 270 may be configured such that the alternating current power supplied from the converter 250 is output through the third output terminal 265 and the fourth output terminal 275, have. Therefore, the third output terminal 265 and the fourth output terminal 275 are AC output terminals, and the electronic apparatus using the AC power can receive operating power through them.

3 is a perspective view showing a multi-receptacle apparatus according to another embodiment of the present invention.

3, the multi-receptacle apparatus 300 according to the second embodiment of the present invention includes a housing 310, an input unit 320, a first output unit 330, 330 ', a second output unit 340, 340 ', a third output unit 350, 350', and a switch unit 360.

Since the configuration of the housing 310, the input unit 320, the first output units 330 and 330 'and the second output units 340 and 340' in the second embodiment are the same as those in the first embodiment, The description of which will be omitted.

The third output units 350 and 350 'are for supplying power to electronic devices requiring low-voltage direct current power as input power. The first and second output units 330 and 330' and the second output units 340 and 340 ' ') To output the second DC power of low voltage. The voltage of the second DC power may be lower than the voltage of the first DC power outputted through the first output units 330 and 330 '. As an example, the voltage of the second direct current power may be 3.6V to 20V. Although not shown in FIG. 3, in addition to a converter (hereinafter, referred to as a first converter) for converting a high-voltage direct-current power input through the input unit 320 into alternating-current power into the housing 310 or one side of the housing 310, And a second converter for converting the DC power of the DC power supply to a DC power of a low voltage. The second conversion unit may be a DC-DC converter, for example.

The third output units 440 and 440 'may include a universal serial bus (USB) output terminal. For example, the third output units 440 and 440' may be implemented as a UBS type-C supporting 20V and 5A power transmission.

The switch unit 360 is provided on the upper side of the housing 310 and is electrically connected to the input unit 320 to switch the supply path of the DC power input through the input unit 320 to thereby output the output terminals 330, 340, 340 ', 350, and 350', respectively.

A display unit 360 is connected to the switch unit 360 and displays information on whether power is output from the output terminals 330, 330 ', 340, 340', 350 and 350 ' May be provided. In this case, the display unit may include at least one LED (Light Emitting Diode). DC power may be supplied to or cut off from the display unit according to the switching state of the switch unit 360, and through which switch the power is outputted.

Although not shown in FIG. 3, the multi-receptacle apparatus 300 according to the second embodiment includes a control unit for controlling a voltage of DC power output through the third output units 350 and 350 ' 330 ', 340, 340', 350, 350 'may be connected to the receiving unit. Also, the multi-receptacle device 400 according to the second embodiment may be provided with a protection circuit for protection against overcurrent, overvoltage, overload, and the like.

3, when the first output units 330 and 330 ', the second output units 340 and 340', and the third output units 350 and 350 'are configured by two output terminals, respectively, The first output units 330 and 330 ', the second output units 340 and 340', and the third output units 350 and 350 'may all be configured as one or more output terminals.

4 is a block diagram showing a multi-receptacle apparatus according to the embodiment of FIG.

Hereinafter, the multi-receptacle apparatus according to the second embodiment will be described in more detail with reference to FIG.

4, the multi-receptacle apparatus according to the second embodiment of the present invention includes an input unit 410, a switch unit 420, a first output unit 430, a first conversion unit 440, A second conversion unit 460, a third output unit 470, a sensing unit 480, a control unit 490, and a display unit 495, as shown in FIG.

The input unit 410 is provided at one side of the housing of the multi-receptacle apparatus to receive DC power.

The switch unit 420 is provided on the housing of the multi-receptacle apparatus and is electrically connected to the input unit 410 through a power line so that the DC power input through the input unit 410 is connected to the first output unit 430, The supply path of the DC power supply may be switched or cut off so as to be supplied to at least one of the first output unit 450 and the third output unit 470. For example, the switch unit 420 may include a main switch electrically connected to the input unit 410 to supply DC power to the multi-receptacle apparatus or to cut off the supply of the DC power, A first switch positioned between the output terminals of the main switch and the second output section to allow the first DC power to be output or the output of the first DC power to be interrupted; A second switch for outputting electric power or interrupting the output of the AC power, and a second switch for interrupting the output of the second DC power by being positioned between the output terminal of the main switch and the third output unit 370, And a third switch for disconnecting the first switch.

The first output unit 430 is formed on the upper side of the housing and outputs the first DC power of a high voltage (for example, 300 V or more) based on the DC power supplied through the input unit 410 and the switch unit 420 .

The first conversion unit 440 may be disposed on the inner side or the first side of the housing to convert the DC power supplied from the input unit 410 to AC power. Here, the voltage of the AC power may be equal to the voltage level of the DC power. Alternatively, the first conversion unit 440 may convert the DC power into AC power having a predetermined voltage such as 200 VAC, 110 VAC, 100 VAC, or the like.

The second output unit 450 is formed on the upper side of the housing and is electrically connected to the first conversion unit 440 to output AC power supplied from the first conversion unit 440.

The second conversion unit 460 is connected to the input unit 410 and the switch unit 420. The second conversion unit 460 converts the DC power supplied through the input unit 410 and the switch unit 420 into a second direct current power having a voltage lower than the first direct current power , 3.6V to 20V). The second conversion unit 460 may adaptively adjust the output voltage within a variable voltage range.

The third output unit 470 is formed on the upper side of the housing and is electrically connected to the second conversion unit 460 and outputs second DC power provided from the second conversion unit 460.

The sensing unit 480 may be provided inside or on one side of the housing of the multi-receptacle apparatus to detect whether the power reception apparatus is connected to at least one of the first output unit 430 to the third output unit 470. The sensing unit 480 may include at least one current sensor and / or a voltage sensor, and may include a first output unit 430, a second output unit 450, a third output unit 470, and / And may be connected to the control unit 490 through a power line and / or a communication line, respectively. Accordingly, since the multi-receptacle device 400 according to the present embodiment can supply power to the corresponding output unit only when it is sensed that the plug of the power reception device is inserted into at least one output part, It can be prevented in advance. 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.

The control unit 490 may be provided inside or on one side of the housing and may be electrically connected to the switch unit 420, the second conversion unit 460, and the sensing unit 480. The controller 490 may cause the first output unit 430, the second output unit 450, and the third output unit 470 to output power or to block output power, respectively. The control unit 490 controls the switching operation of the switch unit 420 using the switching control signal based on the sensing signal from the sensing unit 480 or controls the switching operation of the switch unit 420 using the output voltage level of the second conversion unit 460 Can be controlled.

For example, when a signal including request voltage information is received from the power receiving unit in a state where the power receiving unit is connected to the third output unit 470, the controller 490 controls the second converting unit 460 Can be adjusted. Here, the communication between the control unit 490 and the water receiving apparatus may be PLC (Power Line Communication). That is, the signal including the required voltage information may be transmitted from the power receiving device to the controller 490 through the power line. Alternatively, the signal including the required voltage information may be transmitted from the power receiving device to the control unit 490 through a separate communication line.

On the other hand, when a signal including the required voltage information is received, the controller 490 may transmit a voltage control signal according to the required voltage information to the second converter 460 using a power line and / or a communication line. The control unit 490 may control the switch unit 420 to output DC or AC power through the corresponding output unit when the sensing unit 480 receives the sensing signal. If the detection signal is a signal indicating that the plug is detected in the third output unit 470, the controller 490 controls the DC power of the reference voltage to be output through the third output unit 470, 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 490 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 460 reaches the target voltage. For example, the control unit 490 may control DC power to be output to a reference voltage of 5 VDC when the water receiving apparatus is connected to the third output unit 470. Thereafter, the control unit 490 sets the output voltage of the second conversion unit 460 to 9V and outputs the DC power at 9V from the second conversion unit 460 when the voltage requirement information for 9V is received from the water receiving apparatus The output voltage of the second converter 460 can be controlled to be increased by a predetermined level until the output voltage of the second converter 460 is increased. For example, the control unit 490 may gradually increase or decrease the output voltage of the second conversion unit 460 by 200 mV.

As another example, the control unit 490 may include a predetermined interface. In this case, the control unit 590 may receive a setting value for the output voltage of the third output unit 470 from the user through the interface. For example, when the user sets the target voltage through the interface, the control unit 490 can control the output voltage of the second conversion unit 460 to gradually increase or decrease until the output voltage of the second conversion unit 460 reaches the target voltage .

The display portion 495 may be provided on a switch corresponding to the other side or each output portion of the housing. For example, the display unit 495 may include at least one LED electrically connected to the switch unit 420. The first output unit 430, the second output unit 450, and the third output unit 470 The information about whether or not the power is outputted in each of the plurality of display areas.

Meanwhile, the sensing unit 480, the control unit 490, and / or the display unit 495 may receive the DC power necessary for performing the above-described operation from the second conversion unit 460. To this end, the second converter 460 includes a first converter (not shown) for supplying the second DC power to the third output 470, a sensing unit 480, a controller 490, and / And a second converter (not shown) for supplying driving power to the light source 495. [ 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.

In the above-described embodiments, a multi-receptacle device capable of outputting both DC power and AC power has been described. However, the multi-receptacle device according to the present invention may be configured such that only the DC power can be output or the AC power May be implemented in a printable form. That is, the multi-receptacle apparatus according to the present invention may be implemented in a form in which only one output unit of the first to third output units is included, or a combination of any two output units, if necessary.

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

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

When the connection of the plug is detected to the output terminal, the control unit controls the output terminal to output the direct current power to the reference voltage (S510).

Thereafter, when a signal including the required voltage information is received from the power receiving device through the plug (S520), a target voltage is set according to the required voltage information (S530), and a conversion unit So that the target voltage is outputted (S540).

For example, when the reference voltage is 5VDC and the target voltage is 12VDC, the controller may transmit a voltage increase request signal to the second converter until the current output voltage of the second converter reaches 12VDC have. In this case, the second converter may increase the output voltage by 200 mV each time it receives the voltage increase request signal. 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 second 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.

As another example, if the output voltage of the second converter is 20VDC and the target voltage is 5VDC, that is, the voltage of the DC power output through the current output is 20VDC, The controller may transmit a voltage drop control signal to the converter until the current output voltage at the second converter reaches 5VDC. In this case, the second converter 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 a voltage control signal to the second conversion unit, the voltage control signal indicating to convert the output power to a power of 5VDC. In this case, the second converter 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 (S550), the controller can control to maintain the current output voltage.

On the other hand, if the requested voltage information is not received from the receiving apparatus in step S520, the control unit may control the DC output of the reference voltage to be continuously output from the second output unit.

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.

100: Multi-outlet device
110: Housing
120: input terminal
130: Main switch
140, 140 ': first output terminal
150, 150 ': a second output terminal
160: Individual switch

Claims (13)

In the multi-outlet device,
A housing forming an outer shape of the multi-receptacle device;
An input unit provided at one side of the housing to receive DC power;
A first converting unit provided in the housing and converting the DC power into first DC power;
A first output unit provided on the housing to output the first DC power;
A second converter provided in the housing to convert the DC power into AC power;
A second output unit formed on the housing and electrically connected to the second conversion unit to output the AC power; And
And a control unit for controlling the voltage of the first direct current power that is provided in the housing and is electrically connected to the first conversion unit and output through the first output unit,
, ≪ / RTI &
Wherein,
And controls the first DC power to be output to a reference voltage of 5V when the power receiving apparatus is connected to the first output unit,
Wherein when the voltage increase request signal is received from the power reception apparatus, the output voltage of the first output unit is increased by 200 mV each time the voltage increase request signal is received. The method according to claim 1,
Wherein the input unit comprises:
A DC plug for electrical contact with an external socket providing the DC power supply; And
And a cable for connection between the DC plug and the housing. delete delete delete delete delete The method according to claim 1,
Wherein,
And receives a signal for the required voltage from the power reception device through power line communication. The method according to claim 1,
Further comprising a sensing unit electrically connected to at least one of the first output unit and the second output unit to sense whether the power reception unit is connected to the output unit. The method according to claim 1,
Further comprising a switch unit provided on the housing and electrically connected to the input unit to switch or cut off the supply path of the DC power supply. 11. The method of claim 10,
Wherein,
A main switch electrically connected to the input unit to supply the DC power or shut off the supply of the DC power;
A first switch located between the main switch and an output terminal of the first output unit to output the first direct current power or shut off the output of the first direct current power; And
A second switch which is located between the main switch and the output terminal of the second output unit to output the AC power or blocks the output of the AC power,
The multi-outlet device according to claim 1, 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 the first output unit or the second output unit, Outlet device. In the multi-outlet device,
A housing forming an outer shape of the multi-receptacle device;
An input unit provided at one side of the housing to receive DC power;
A first DC power output unit provided on the housing to output a first DC power based on the DC power;
A converter for converting a DC power supplied from the input unit into a second DC power having a voltage lower than that of the first DC power;
A second DC power output unit formed on an upper side or the other side of the housing and electrically connected to the conversion unit to output the second DC power; And
A controller for controlling a voltage of the second DC power output from the second DC power output unit, the DC power being provided in the housing and being electrically connected to the converting unit,
, ≪ / RTI &
Wherein,
And controls the second DC power to be output to a reference voltage of 5 V when the power receiver is connected to the second DC power output unit,
And increases the output voltage of the second DC power output unit by 200 mV whenever the voltage increase request signal is received from the power reception apparatus.

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