JP5032292B2 - Catch ceiling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hooking ceiling for using by connecting to any of a connector of an AC equipment and a connector of a DC equipment. <P>SOLUTION: The hooking ceiling 1 includes an AC connecting part 4a arranged for connecting to a connector of an AC equipment, an AC input terminal part 5a for connecting the AC connecting part 4a to an external AC power supply 6, a DC connecting part 4b arranged for connecting to a connector of a DC equipment, and a DC supply means for supplying DC power supply to the DC connecting part 4b. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a hook ceiling installed on a ceiling surface or the like of a building.

  BACKGROUND ART Conventionally, a hook ceiling installed on a ceiling surface of a building or the like is well known (see, for example, Patent Document 1). This hook ceiling has a structure in which a pair of insertion holes having an arc shape are provided on the lower surface of the body and an AC connection is provided in the vicinity of each insertion hole in the body. And in the state which inserted the L-shaped connection terminal with which the plug of AC devices, such as lighting equipment, was inserted into the above-mentioned insertion slot, and latched it, the connection terminal of the plug of AC device and the AC connection part of hook ceiling And are to be electrically connected.

However, in the above-described conventional hook ceiling, although an AC device can be used with the connection terminal connected, the DC device cannot be used with the connection terminal connected.
JP 2001-35585 A

  This invention is invented in view of the said problem, Comprising: It is a subject to provide the hooking ceiling which can be used even if it is any of the connection terminal of AC apparatus, and the connection terminal of DC apparatus. To do.

In order to solve the above-mentioned problems, the present invention relates to an AC connection portion 4a arranged to connect a connection terminal of an AC device 102a which is a device that operates by inputting an AC power supply, and the AC connection portion 4a is connected to an external AC. An AC input terminal portion 5a to be connected to the power source 6, a DC connection portion 4b arranged to connect a connection terminal of a DC device 102b which is a device that operates by inputting a DC power source, and a DC current is connected to the DC connection portion 4b. A hook ceiling 1 comprising a DC supply means for supplying power, wherein the DC supply means comprises a DC input terminal part 5b for connecting the DC connection part 4b to the external DC power supply 2, and is used for backup DC. As a power source, a secondary battery 10 connected to the DC connection 4b is provided, and this secondary battery 10 is charged and discharged in a DC circuit that connects the DC input terminal 5b and the DC connection 4b. And that is connected via the road 9. By doing in this way, even if it is any of the alternating current apparatus 102a and the direct current apparatus 102b, a connection terminal can be connected and used for the corresponding alternating current connection part 4a or direct current connection part 4b.

Moreover, the DC supply means, since a DC input terminal portions 5b for connecting the DC connection portion 4b to an external DC power source 2, for example equal to construct a DC distribution system external AC power source 6 and an external DC power source 2 are both In the building which has, the hook ceiling 1 can be installed by connecting the AC input terminal portion 5 a to the external AC power source 6 of the building and connecting the DC input terminal portion 5 b to the external DC power source 2. In addition, since the secondary battery 10 connected to the DC connection unit 4b is provided as a backup DC power supply, the secondary battery 10 is used as a DC power supply in the event of a power failure, and power is stably supplied to the DC device 102b. be able to.

  Also, the distance between the pair of insertion ports 3a for inserting the connection terminal of the AC device 102a and connecting it to the AC connection portion 4a, and the connection terminal of the DC device 102b for connecting to the DC connection portion 4b. It is also preferable that the distance between the pair of insertion openings 3b is different. By doing so, the connection terminal of the AC device 102a is not inserted into the DC insertion port 3b, and the connection terminal of the DC device 102b is not inserted into the AC insertion port 3a. Is reliably prevented.

  Moreover, a pair of insertion port 3a for inserting the connection terminal of AC apparatus 102a and connecting it to AC connection part 4a, and a pair of insertion for inserting the connection terminal of DC apparatus 102b and connecting it to DC connection part 4b It is also preferable to arrange the mouth 3b so as to intersect. By doing in this way, the insertion port 3a for alternating current, the alternating current connection part 4a, and the insertion port 3b for direct current | flow and the direct current connection part 4b can be arrange | positioned compactly, without enlarging the whole body.

  The invention according to claim 1 has an effect that any one of the connection terminal of the AC device and the connection terminal of the DC device can be connected to the common hooking ceiling.

In addition to the above-described effect, the invention according to claim 1 may be used in a building having both an external AC power source and an external DC power source, for example, by constructing a DC power distribution system. There is an effect that the input terminal portion is connected, the DC input terminal portion is connected to the external DC power source, and the hooking ceiling can be installed, and the secondary battery can be used as a DC power source in the event of a power failure .

The invention according to claim 2, in addition to the effect of the invention according to claim 1, an effect that erroneous connection of the DC and AC is reliably prevented.

In addition to the effect of the invention according to claim 1 or 2 , the invention according to claim 3 has an effect that the entire body can be formed compactly.

  Hereinafter, an example of the hook ceiling 1 according to an embodiment of the present invention will be described with reference to the drawings. First, the whole power distribution system in a building in which the hook ceiling 1 of the present example is arranged will be described based on FIG. 3, and then the hook ceiling 1 will be further described in detail based on FIG. 1 and FIG.

  Although the embodiment of the power distribution system described below is described assuming a detached house as a building to which the present invention is applied, it does not preclude applying the technical idea of the present invention to an apartment house. As shown in FIG. 3, the house H is provided with a DC power supply unit 101 that outputs DC power and an electric device 102 as a load driven by the DC power, and an output end of the DC power supply unit 101. The DC power is supplied to the electric device 102 through the DC supply line Wdc connected to. A current flowing through the DC supply line Wdc is monitored between the DC power supply unit 101 and the electric device 102. When an abnormality is detected, power is supplied from the DC power supply unit 101 to the electric device 102 on the DC supply line Wdc. A DC breaker 114 is provided for limiting or blocking the current.

  The DC supply line Wdc is used as both a DC power supply path and a communication path, and is connected to the DC supply line Wdc by superimposing a communication signal for transmitting data on a DC voltage using a high-frequency carrier wave. Enables communication between devices. This technique is similar to a power line carrier technique in which a communication signal is superimposed on an AC voltage in a power line that supplies AC power.

  The DC supply line Wdc is connected to the home server 116 via the DC power supply unit 101. The in-home server 116 is a main device for constructing a home communication network (hereinafter referred to as “home network”), and communicates with a subsystem or the like constructed by the electrical device 102 in the home network.

  In the example shown in the figure, as a subsystem, an illumination system comprising an information equipment system K101 comprising an information electrical equipment 102 such as a personal computer, a wireless access point, a router, and an IP telephone, and an illumination electrical equipment 102 such as a lighting fixture. K102 and K105, a front door system K103 including an electric device 102 for dealing with visitors and monitoring intruders, a residential alarm system K104 including an alarm-type electric device 102 such as a fire detector, and the like. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The above-described DC breaker 114 is provided in association with a subsystem. In the illustrated example, four DCs are associated with the information equipment system K101, the lighting system K102 and the entrance system K103, the house alarm system K104, and the lighting system K105. A breaker 114 is provided. When a plurality of subsystems are associated with one DC breaker 114, a connection box 121 for dividing the system of the DC supply line Wdc is provided for each subsystem. In the illustrated example, a connection box 121 is provided between the illumination system K102 and the entrance system K103.

  As the information equipment system K101, an information equipment system K101 comprising an electrical equipment 102 connected to a DC outlet 131 for DC power distribution arranged in advance in a house H in the form of a wall outlet or a floor outlet (constructed during construction of the house H). Is provided.

  As the lighting systems K102 and K105, a lighting system K102 composed of a lighting device (electric device 102) arranged in advance in the house H, and a lighting device (electric device 102) connected to a later-described hook ceiling 1 arranged in front of the ceiling. And an illumination system K105. When the interior of the house H is constructed, the contractor attaches the lighting fixture to the hook ceiling 1, or the resident himself attaches the lighting fixture.

  In addition to using an infrared remote control device, an instruction to control the lighting fixture that is the electrical device 102 that constitutes the lighting system K102 can be given using a communication signal from the switch 141 connected to the DC supply line Wdc. That is, the switch 141 has a communication function together with the electric device 102. In addition, a control instruction may be given by a communication signal from another electrical device 102 in the home network or the home server 116 regardless of the operation of the switch 141. The instructions to the lighting fixture include lighting, extinguishing, dimming, and blinking lighting.

  An arbitrary electrical device 102 can be connected to the DC outlet 131 and the hook ceiling 1 described above, and DC power can be output to the connected electrical device 102 (the hook ceiling 1 of this example is an AC power). In the following description, when there is no need to distinguish between the DC outlet 131 and the hooking ceiling 1, they are referred to as “DC outlets”.

  These DC outlets supply power in a contact manner. When the electric device 102 connected to the DC outlet has a communication function, a communication signal can be transmitted through the DC supply line Wdc. A communication function is provided not only in the electric device 102 but also in the DC outlet.

  The home server 116 not only is connected to the home network, but also has a connection port connected to the wide area network NT that constructs the Internet. When the in-home server 116 is connected to the wide area network NT, it is possible to receive services from the center server 200 that is a computer server connected to the wide area network NT.

  The service provided by the center server 200 includes a service that enables monitoring and control of equipment (mainly the electrical equipment 102 but also other equipment having a communication function) connected to the home network through the wide area network NT. is there. This service makes it possible to monitor and control devices connected to the home network using a communication terminal (not shown) having a browser function such as a personal computer, Internet TV, or mobile phone.

  The in-home server 116 has both functions of communication with the center server 200 connected to the wide area network NT and communication with equipment connected to the home network, and identification information about equipment in the home network ( Here, it is assumed that an IP address is used).

  The home server 116 enables monitoring and control of home devices through the center server 200 from a communication terminal connected to the wide area network NT by using a communication function with the center server 200. The center server 200 mediates between home devices and communication terminals on the wide area network NT.

  When monitoring and controlling home devices from a communication terminal, monitoring and control requests are stored in the center server 200, and the home device periodically performs one-way polling communication to monitor from the communication terminal. And receive control requests. With this operation, it is possible to monitor and control devices in the house from the communication terminal.

  Further, when an event that should be notified to the communication terminal, such as a fire detection, occurs in the home device, the home device notifies the center server 200, and the center server 200 notifies the communication terminal by e-mail.

  An important function among the communication functions with the home network in the home server 116 is the detection and management of the devices constituting the home network. The home server 116 automatically detects devices connected to the home network by applying UPnP (Universal Plug and Play). The home server 116 includes a display device 117 having a browser function, and displays a list of detected devices on the display device 117. The display device 117 has a configuration with a touch panel type or an operation unit, and can perform an operation of selecting desired contents from options displayed on the screen of the display device 117. Therefore, the user (contractor or householder) of the home server 116 can monitor or control the device on the screen of the display device 117. The display device 117 may be provided separately from the home server 116.

  The in-home server 116 manages information related to device connection, and grasps the type, function, and address of the device connected to the home network. Accordingly, the devices in the home network can be operated in conjunction with each other. Information on the connection of the device is automatically detected as described above. In order to operate the device in an interlocking manner, the device itself is automatically associated with the attribute held by the device itself, and the home server 116 is configured as a personal computer. It is also possible to connect various information terminals and use the browser function of the information terminals to associate devices.

  Each device holds the relationship of the interlocking operation of the devices. Therefore, the device can operate in an interlocked manner without passing through the home server 116. By associating the linked operations for each device, for example, by operating a switch that is a device, it is possible to turn on or off the lighting fixture that is the device. In many cases, the association of the interlocking operations is performed within the subsystem, but the association beyond the subsystem is also possible.

  By the way, the DC power supply unit 101 generates DC power by power conversion of an AC power supply AC supplied from outside the house like a commercial power supply. In the configuration shown in the figure, the AC power source AC is input to an AC / DC converter 112 including a switching power source through a main circuit breaker 111 attached to the distribution board 110 as an internal unit. The DC power output from the AC / DC converter 112 is connected to each DC breaker 114 through the cooperative control unit 113.

  Since the drive voltage of the electric device 102 is selected from a plurality of types of voltages depending on the device, the cooperative control unit 113 is provided with a DC / DC converter to convert the DC voltage obtained from the main power source and the distributed power source into the necessary voltage Is desirable. Normally, one type of voltage is supplied to one subsystem (or the electric equipment 102 connected to one DC breaker 114), but three or more wires are used for one subsystem. A plurality of types of voltages may be supplied. Alternatively, it is possible to adopt a configuration in which the DC supply line Wdc is of a two-wire type and the voltage applied between the lines is changed with time. The DC / DC converter may be provided in a plurality of dispersed manners like the DC breaker.

  In the above configuration example, only one AC / DC converter 112 is illustrated, but a plurality of AC / DC converters 112 can be arranged in parallel, and when a plurality of AC / DC converters 112 are provided. It is desirable to increase or decrease the number of AC / DC converters 112 that are operated according to the magnitude of the load.

  The above-described AC / DC converter 112 and the cooperative control unit 113 are provided with a communication function, and can perform a cooperative operation to cope with a load state including the main power source, the distributed power source, and the electric device 102. The communication signal used for this communication is transmitted in the form of being superimposed on the DC voltage in the same manner as the communication signal used for the electric device 102.

  In the above example, the AC / DC converter 112 is arranged in the distribution board 110 in order to convert the AC power output from the main breaker 111 into DC power by the AC / DC converter 112. On the output side, a branch breaker (not shown) provided in the distribution board 110 branches the AC supply line into a plurality of systems, and an AC / DC converter is provided on the AC supply line of each system to convert it into DC power for each system. You may employ | adopt the structure to do.

  In this case, since the DC power supply unit 101 can be provided for each floor or room of the house H, the DC power supply unit 101 can be managed for each system, and the electric device 102 that uses DC power Since the distance of the DC supply line Wdc between the two is reduced, the power loss due to the voltage drop in the DC supply line Wdc can be reduced. Also, the main breaker 111 and the branch breaker are housed in the distribution board 110, and the AC / DC converter 112, the cooperative control unit 113, the DC breaker 114, and the home server 116 are housed in a separate board from the distribution board 110. Also good.

  Next, the structure of the hook ceiling 1 of this example is explained in full detail based on FIG.1 and FIG.2.

  As shown in FIG. 1, the hook ceiling 1 has a disk-shaped container body 7, and a pair of protrusions protruding from a plug (not shown) of an electric device 102 on the lower surface of the container body 7. L-shaped connection terminals (not shown) form two pairs of insertion ports 3 into which the terminals are inserted and rotated. Each insertion port 3 is located on two large and small concentric circles (see the imaginary line in the figure) drawn around the central portion 7a of the lower surface of the vessel body 7, and is formed on the outer circumference of the large diameter. A pair of arc-shaped insertion ports 3a and a pair of arc-shaped insertion ports 3b formed on the inner small-diameter circumference. The pair of outer insertion ports 3a are openings dedicated to AC connection into which plug connection terminals of electric devices 102 (hereinafter referred to as “AC device 102a”) that are AC driven are inserted, and the pair of inner insertion ports 3b. This is an opening dedicated to DC connection into which a connection terminal of a plug of an electric device 102 (hereinafter referred to as “DC device 102b”) to be DC driven is inserted.

  The insertion port 3a for AC connection and the insertion port 3b for DC connection are both narrow portions formed narrow on one side (right side in the illustrated example) in the left-right direction when viewed from the central portion 7a of the container body 7. And has a wide portion formed wider on the other side in the left-right direction (left side in the illustrated example). The width of the wide portion is a width that can be inserted straight through the tip of the connection terminal bent in an L shape, and the width of the narrow portion is a width that cannot be inserted straight through the tip of the connection terminal. is there.

  In the vicinity of the outer insertion port 3a inside the vessel body 7, an AC connection part 4a to which a connection terminal of the AC device 102a inserted and rotated through the insertion port 3a is electrically connected is arranged. Further, in the vicinity of the inner insertion port 3b in the container 7, a DC connection part 4b to which a connection terminal of the DC device 102b inserted and rotated through the insertion port 3b is electrically connected is arranged.

  Therefore, in order to insert and hook the L-shaped connection terminal of the plug of the AC device 102a into the outer insertion port 3a, the tip of the connection terminal is inserted straight into the wide portion of the insertion port 3a. After that, the plug may be rotated clockwise so that the central portion 7a of the container body 7 becomes the center. At the stage where the distal end portion of the connection terminal is introduced to the narrow portion side of the insertion port 3a by rotation, the AC connection portion 4a disposed in the container body 7 locks the distal end portion of the connection terminal. At this time, the AC connection part 4a on the hook ceiling 1 side and the connection terminal on the AC device 102a side are electrically connected. Similarly, when the L-shaped connection terminal of the plug of the DC device 102b is inserted into the inner insertion port 3b and hooked and locked, the tip of the connection terminal is also straight into the wide portion of the insertion port 3b. After the insertion, the plug may be rotated clockwise so that the central portion 7a of the container body 7 is centered. At the stage where the distal end of the connection terminal is introduced to the narrow side of the insertion port 3b by rotation, the DC connection portion 4b arranged in the container body 7 locks the distal end of the connection terminal, and the hooking ceiling 1 The DC connection portion 4b on the side and the connection terminal on the DC device 102b side are electrically connected.

  As shown in FIG. 2, a pair of AC input terminal portions 5 a are installed on the device body 7 of the hook ceiling 1 of this example, and each AC input terminal portion 5 a is connected to the AC connection portion 4 a in the device body 7. I am letting. The AC input terminal portion 5a is connected to the AC power source AC constituting the external AC power source 6 of the present example via the main breaker 111 (see FIG. 1). In the illustrated example, an AC breaker 8 is interposed between the main breaker 111 and the AC input terminal portion 5a. In addition, a pair of DC input terminal portions 5 b are installed in the housing 7 of the hook ceiling 1, and each DC input terminal portion 5 b is connected to the DC connection portion 4 b in the housing 7. The DC input terminal unit 5b is connected to the DC power supply unit 101 constituting the external DC power source 2 of this example via the DC breaker 114.

  A secondary battery 10 is connected via a charging / discharging circuit 9 in a DC circuit connecting the DC input terminal unit 5 b and the DC connection unit 4 b. The secondary battery 10 functions as a backup DC power source in the event of a power failure. Further, a power failure detection circuit 11 for detecting a power failure by monitoring the voltage of the external DC power source 2 is connected to the DC power circuit, and the power failure detection circuit 11 and the charge / discharge circuit 9 are connected. Further, a switch 12 that is normally in an on state and in an off state at the time of a power failure is interposed in the DC circuit. Reference numeral 13 in the figure is a separate switch.

  In the catch ceiling 1 of the present example, the secondary battery 10 is appropriately charged through the charge / discharge circuit 9 at normal times, and the power failure detection circuit 11 that detects this is controlled to switch the DC power source at the time of power failure. In other words, the power failure detection circuit 11 that has detected a power failure outputs a signal to the switch 12 and the charge / discharge circuit 9 and switches the switch 12 that is in the on state to the off state, thereby connecting the DC input terminal 5b (that is, the external DC power source 2). The connection of the DC connection part 4 b is cut off, and the secondary battery 10 and the DC connection part 4 b are connected via the charge / discharge circuit 9.

  According to the hook ceiling 1 having the above-described configuration, the plug connection terminal is inserted into the dedicated insertion ports 3a and 3b in either the AC device 102a or the DC device 102b, and the corresponding AC connection portion 4a or DC connection is inserted. It can be connected to the part 4b. In the illustrated example, the dedicated insertion ports 3a and 3b are arranged close to each other on the same surface so that the AC device 102a and the DC device 102b are selectively connected. However, both the AC device 102a and the DC device 102b are used. May be connected at the same time.

  Moreover, since the DC power source connected to the DC connection unit 4b is switched from the external DC power source 2 to the secondary battery 10 at the time of a power failure, power can be stably supplied to the DC device 102b even in an emergency. And when installing this hook ceiling 1 on a ceiling surface or the like, the DC input terminal part 5b provided in the vessel body 7 and the DC power supply part 101 are connected via the DC supply line Wdc or the DC breaker 114, Similarly, the AC input terminal 5 a provided in the vessel body 7 and the AC power source AC can be installed simply by connecting them via the main breaker 111 or the AC breaker 8.

  Further, the distance between the pair of insertion ports 3a for inserting the connection terminal of the AC device 102a and connecting it to the AC connection portion 4a and the connection terminal of the DC device 102b for connecting to the DC connection portion 4b The distance between the pair of insertion ports 3b is set so that the distance between the AC insertion ports 3a is larger than the distance between the DC insertion ports 3b. A certain pair of connection terminals is surely inserted into the pair of direct current insertion ports 3b, and the pair of connection terminals provided in the direct current device 102b is surely inserted into the pair of insertion ports 3a for alternating current. To be prevented.

  In addition, the pair of insertion ports 3a for alternating current and the pair of insertion ports 3b for direct current intersect each other at the central portion 7a of the lower surface of the container body 7 so as to connect the pair of insertion ports 3a and 3b. As shown, they are arranged in a crossing manner (so as to be substantially orthogonal in the illustrated example). Therefore, when the AC insertion port 3a and the AC connection portion 4a and the DC insertion port 3b and the DC connection portion 4b are arranged in the same plane of the device body 7, the empty space of the device body 7 is effectively used. Therefore, the container body 7 can be formed compactly without increasing its size.

  Next, another example of the hook ceiling 1 according to the embodiment of the present invention will be described with reference to FIG. A detailed description of the same configuration as the above example will be omitted, and a characteristic configuration different from the example will be described in detail below.

  In the hook ceiling 1 of this example, the DC connection 4b is connected to the external DC power supply 2 as an example as a DC supply means for supplying DC power to the DC connection 4b disposed in the container 7. (A DC power supply unit 101) is not provided with a DC input terminal unit 5b, but an AD conversion circuit 14 connected to the AC input terminal unit 5a is provided.

  That is, the AC input terminal portion 5 a of this example is connected to the AC connection portion 4 a and also connected to the DC connection portion 4 b via the AD conversion circuit 14. When installing the hook ceiling 1 on a ceiling surface or the like, the AC input terminal 5a and the AC power source AC may be connected via the main breaker 111 or the like.

  A power failure detection circuit 11 that monitors the voltage of the external AC power source 6 (that is, the AC power source AC) and detects a power failure is connected to the AC circuit that connects the AC input terminal unit 5a and the AC connection unit 4a. ing. In addition, a switch 12 that is normally in an on state and in an off state at the time of a power failure is interposed in a direct current circuit that connects the AC conversion circuit 14 and the direct current connection portion 4b. The battery 10 is connected. The power failure detection circuit 11 and the charge / discharge circuit 9 are connected.

  In the catch ceiling 1 of the present example, the secondary battery 10 is appropriately charged through the charge / discharge circuit 9 at normal times, and the power failure detection circuit 11 that detects this is controlled to switch the DC power source at the time of power failure. That is, when the power failure is detected, the power failure detection circuit 11 outputs a signal to the switch 12 and the charge / discharge circuit 9 and switches the switch 12 that is in the on state to the off state to cut off the connection between the AD conversion circuit 14 and the DC connection portion 4b. At the same time, the secondary battery 10, which is a backup DC power supply, is connected to the DC connection portion 4 b through the charge / discharge circuit 9.

  According to the hook ceiling 1 having the above-described configuration, it is only necessary to connect the AC input terminal portion 5a to the external AC power source 6, so that installation is easy. Further, the hook ceiling 1 having the above-described configuration can be installed without any problem even in a building that does not have the external DC power source 2 such as the DC power supply unit 101 described in the example.

The external shape of an example hook ceiling in embodiment of this invention is shown, (a) is a perspective view, (b) is a front view. It is a whole explanatory view of a power distribution system constituted using hook ceiling same as the above. It is a circuit diagram of hook ceiling same as the above. It is a circuit diagram of the hook ceiling of the other example in the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Catch ceiling 2 External DC power supply 4a AC connection part 4b DC connection part 5a AC input terminal part 5b DC input terminal part 6 External AC power supply 10 Secondary battery 14 AC conversion circuit 102a AC apparatus 102b DC apparatus

Claims (3)

An AC connection unit arranged to connect an AC device connection terminal that operates by inputting an AC power source, an AC input terminal unit that connects the AC connection unit to an external AC power source, and a DC power source A hooking ceiling comprising a DC connection portion arranged to connect a connection terminal of a DC device that is a device that operates as a DC power supply means for supplying DC power to the DC connection portion , The DC supply means comprises a DC input terminal part for connecting a DC connection part to an external DC power supply, and comprises a secondary battery connected to the DC connection part as a backup DC power supply. A hook ceiling, characterized in that it is connected via a charge / discharge circuit in a DC electric circuit connecting a DC input terminal part and a DC connection part . The distance between the pair of insertion ports for inserting the connection terminal of the AC device and connecting to the AC connection portion, and the distance between the pair of insertion ports for inserting the connection terminal of the DC device and connecting to the DC connection portion The hook ceiling according to claim 1, wherein the hook ceiling is provided differently. A pair of insertion ports for inserting the connection terminal of the AC device and connecting to the AC connection portion and a pair of insertion ports for inserting the connection terminal of the DC device and connecting to the DC connection portion are crossed. The hook ceiling according to claim 1, wherein the hook ceiling is arranged.

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