JP2009178026A - Dc power distribution system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a DC power distribution system capable of distributing DC power having a desired voltage level to a number of sites while extending a wiring distance, and informing about a power distribution board (main power distribution board or distributed power distribution board) in which an abnormal current is applied. <P>SOLUTION: The DC power distribution system includes: a main distribution board MPB containing an AC/DC conversion device 3 for converting AC power supplied from an AC power system AC into DC power; and a plurality of distributed distribution board SPB1-SPB 4 containing a DC/DC conversion device 10 for converting the DC power supplied from the main distribution board MPB into DC power of a desired level. In a notification section 3 of the main power distribution board MPB, when a communication signal is received by the signal receiving section 30, a signal determination control section 32 refers to a data table of a storage section 33 to acquire identification information about a main switch 11 which has detected an abnormal current from a transmission destination address of a communication signal and about a distributed power distribution board SPBn having the main switch 11 installed thereon, and causes a display section 31 to display the acquired identification information (e.g. a number of the distributed power distribution board SPBn in which an abnormal current has been detected or an installation site thereof). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a DC power distribution system that distributes DC power indoors.

Conventionally, there has been one disclosed in Patent Document 1 as a DC distribution system that distributes DC power indoors. This conventional system has a distribution board and an AC power outlet, a DC output power terminal is provided in the AC power outlet, and a transformer and a rectifier are arranged in the distribution board. The AC voltage of 100 volts or 200 volts is converted into three types of AC voltages of 6 volts, 3 volts, and 1.5 volts by a rectifier, and then these AC voltages are rectified by a rectifier to obtain 6 volts, 3 volts, 1 Three types of DC voltages of 5 volts were obtained.
Japanese Utility Model Publication No. 4-128024

  However, in the above conventional example, since three types of DC voltage created in the distribution board are distributed to the DC output power supply terminal, the influence of the voltage drop due to the wiring resistance becomes large especially at a low voltage. There was a problem that the length could not be increased.

  Therefore, the present applicant distributes a relatively high level of DC power from the main distribution board to the plurality of distributed distribution boards, and the DC / DC converters in each of the distributed distribution boards use a DC voltage of a desired voltage level. We have invented a direct current distribution system that reduces the influence of voltage drop due to wiring resistance by converting it into electric power and feeding it to the load. Here, when a plurality of distributed distribution boards are installed, if an abnormal current such as a ground fault current (leakage current) or overcurrent (overload current and short-circuit current) flows, which distribution board (main distribution board) There is a problem that it is difficult for the user to determine whether an abnormal current has flowed in the panel and a plurality of distributed distribution boards.

  The present invention has been made in view of the above circumstances. The purpose of the present invention is to provide a distribution board that can distribute direct current power at a desired voltage level to multiple locations while extending the wiring distance and flows an abnormal current ( It is an object of the present invention to provide a DC power distribution system capable of informing a main distribution board or a distributed distribution board.

  In order to achieve the above object, the invention according to claim 1 includes a main distribution board that houses an AC / DC converter that converts AC power supplied from an AC power system into DC power, and a main distribution board. And a plurality of distributed distribution boards containing DC / DC converters for converting the supplied DC power to a desired level of DC power, and a leakage current detection means for detecting leakage current flowing in the power supply path is the main distribution board Or provided in at least one of the distributed distribution boards, notifying that leakage current has been detected by the leakage current detection means, and of the distribution board provided with leakage current detection means for detecting leakage current. An informing means for informing the identification information is provided.

  According to the first aspect of the present invention, a relatively high level of DC power is distributed from the main distribution board to the distributed distribution board, and each of the distributed distribution boards has different voltage levels by the DC / DC converter. By converting to DC power and supplying power to the load, the influence of voltage drop due to wiring resistance can be reduced, and DC power with different voltage levels can be distributed to multiple locations while extending the wiring distance, and a ground fault occurs. In addition, it is possible to notify the user by notifying the distribution board (main distribution board or distributed distribution board) where the ground fault has occurred by the notification means.

  In order to achieve the above object, the invention according to claim 2 includes a main distribution board that houses an AC / DC converter that converts AC power supplied from an AC power system into DC power, and a main distribution board. And a plurality of distributed distribution boards containing DC / DC converters for converting supplied DC power into DC power of a desired level, and an overcurrent detection means for detecting an overcurrent flowing through a power supply path is a main distribution board Or provided in at least one of the distributed distribution boards, notifying that the overcurrent has been detected by the overcurrent detection means, and providing the overcurrent detection means for detecting the overcurrent. An informing means for informing the identification information is provided.

  According to the invention of claim 2, a relatively high level of DC power is distributed from the main distribution board to the distributed distribution board, and each of the distributed distribution boards has different voltage levels by the DC / DC converter. By converting to DC power and supplying power to the load, the influence of voltage drop due to wiring resistance was reduced, and DC power with different voltage levels could be distributed to multiple locations while extending the wiring distance, and overcurrent flowed In addition, it is possible to notify the user by notifying the distribution board (main distribution board or distributed distribution board) in which an overcurrent has passed by the notification means.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the notification means is provided in a main distribution board.

  The invention of claim 4 is the invention of any one of claims 1 to 3, wherein the voltage levels of the DC power output from the DC / DC converters housed in the plurality of distributed distribution boards are different from each other. And

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein at least one of the main distribution board and the distributed distribution board is an AC / DC converter or a DC / DC converter. A first conductive member connected to the output terminal on the potential side, a second conductive member connected to the output terminal on the low potential side of the AC / DC converter or the DC / DC converter, and the first and second One or a plurality of internal units electrically connected to at least one of the conductive members, and the internal unit is disposed on the opposite side of the first conductive member with respect to the second conductive member. And

  According to the fifth aspect of the present invention, when the internal unit is disposed in the distribution board (main distribution board or distributed distribution board), there is a risk of accidentally touching the high-potential side charging unit (first conductive member). Less.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, at least one of the AC / DC converter and the DC / DC converter is connected to an information wiring drawn into the distribution board from outside. An information wiring connection terminal electrically connected to the information wiring, the information wiring connection terminal being provided on the opposite side of the output terminal on the high potential side with respect to the output terminal on the low potential side; It is characterized by being connected to.

  According to the sixth aspect of the present invention, the communication device that communicates via the information wiring can be disposed in the distribution board (main distribution board or distributed distribution board) as an internal unit.

  The invention of claim 7 is the invention of claim 5 or 6, wherein at least one of the AC / DC converter and the DC / DC converter has a plurality of output terminals and is arranged closest to the internal unit. The difference in potential of the other output terminal with respect to the one output terminal becomes larger as the other output terminal arranged farther from the inner unit.

  According to invention of Claim 7, the safety | security of the operation | work which arrange | positions an internal unit in a distribution board (a main distribution board or a distributed distribution board) improves.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein DC power is supplied to the output side of the AC / DC converter in the main distribution board together with the DC / DC converter in the distributed distribution board. A supplied load is connected.

  The invention of claim 9 is the invention of any one of claims 1 to 8, characterized in that the current levels of the DC power output by the respective DC / DC converters are different from each other.

  According to the invention of claim 9, even if the rated voltage is the same, DC power can be supplied to loads having different rated currents, and a circuit breaker (switch) is installed on the output side of the DC / DC converter. In this case, a DC / DC converter that can set the level of overcurrent protection in the circuit breaker to an appropriate level for each load, and maximizes the efficiency in accordance with the rated current of the load. Energy saving can be achieved by selecting.

  According to the present invention, it is possible to distribute DC power at a desired voltage level to multiple locations while extending the wiring distance, and to notify a distribution board (main distribution board or distributed distribution board) in which an abnormal current flows. Can do.

  Hereinafter, an embodiment in which the present invention is applied to a detached house will be described in detail with reference to the drawings. However, the building to which the present invention is applicable is not limited to a detached house, and can be applied to each dwelling unit or office of a collective housing.

  As shown in FIG. 1, the DC power distribution system of the present embodiment includes a main switch 1 and an AC / DC converter 3 that converts AC power supplied from the AC power system AC through the main switch 1 into DC power. And a plurality of (four in the illustrated example) distributed components containing a DC / DC converter 10 that converts DC power supplied from the main distribution panel MPB into DC power of a desired level. DC boards SPB1 to SPB4 are provided, and DC power is supplied to the DC device 102 which is a load through a DC supply line Wdc derived from the distributed distribution boards SPB1 to SPB4.

  The DC supply line Wdc is used as a DC power supply path and also as 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 AC / DC converter 3 as will be described later. 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 constructed by the DC device 102 in the home network. The in-home server 116 and the AC / DC converter 3 are connected by an information wiring (for example, an enhanced category 5 or category 6 twisted pair cable) Ls.

  In the example shown in the drawing, as an subsystem, an illumination system comprising an information equipment system K101 comprising an information-system DC device 102 such as a personal computer, a wireless access point, a router, and an IP telephone, and an illumination system DC equipment 102 such as a lighting fixture. K102, K105, intercom system K103 comprising a DC device 102 for handling visitors and monitoring intruders, etc., a residential alarm system K104 comprising an alarm DC device 102 such as a residential fire alarm (residential alarm), etc. There is. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The AC / DC converter 3 includes an AC / DC converter composed of a conventionally known switching power supply device, and a communication signal superimposing / separating circuit that superimposes and separates a communication signal on a DC voltage output from the AC / DC converter. The terminal block 5 is connected to the output side via a cooperative control unit 4 described later. A plurality of branch circuits are provided on the electric circuit (bus line) connecting the main switch 1 and the AC / DC converter 3, and branch switches 2 are connected to the respective branch circuits. AC power is supplied to AC devices installed in the house H.

  As the information equipment system K101, there is provided an information equipment system K101 composed of a DC equipment 102 connected to a DC outlet 131 arranged in advance in the house H (constructed when the house H is constructed) in the form of a wall outlet or a floor outlet.

  The lighting systems K102 and K105 include a lighting system K102 composed of a lighting device (DC device 102) arranged in advance in the house H and a lighting device (DC device 102) connected to a hook ceiling 132 arranged in advance on the ceiling. An illumination system K105 is provided. At the time of interior construction of the house H, the contractor attaches the lighting fixture to the hook ceiling 132, or the householder himself attaches the lighting fixture.

  In addition to using an infrared remote control device, a control instruction for the lighting apparatus that is the DC device 102 constituting 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 DC device 102. In addition, a control instruction may be given by a communication signal from another DC 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.

  Since any DC device 102 can be connected to the DC outlet 131 and the hooking ceiling 132 described above and DC power is output to the connected DC device 102, the DC outlet 131 and the hooking ceiling 132 are distinguished below. When it is not necessary, it is called “DC outlet”.

  These DC outlets have a plug-in connection port into which a contact (not shown) provided directly on the DC device 102 or a contact (not shown) provided via a connection line is inserted into the body. The contact receiver that directly contacts the contact inserted into the connection port is held by the container. That is, the direct current outlet supplies power in a contact manner. When the DC 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 DC 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 (including mainly the DC 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 on 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 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, in this embodiment, the secondary battery 162 is provided in preparation for the period (for example, power failure period of the commercial power system AC) in which AC power is not supplied from the commercial power system AC. It is also possible to use a solar cell 161 or a fuel cell 163 that generates DC power. The solar cell 161, the secondary battery 162, and the fuel cell 163 are distributed power sources with respect to the main power source including the AC / DC converter 3 that generates DC power from the commercial power system AC. In the illustrated example, the solar cell 161, the secondary battery 162, and the fuel cell 163 include a circuit unit that controls the output voltage, and the secondary battery 162 includes a circuit unit that controls charging as well as discharging.

  Of the distributed power sources, the solar cell 161 and the fuel cell 163 are not necessarily provided, but the secondary battery 162 is preferably provided. The secondary battery 162 is charged in a timely manner by a main power supply or other distributed power supply, and the secondary battery 162 is discharged not only in a period in which power is not supplied from the commercial power system AC but also in a timely manner as necessary. The coordination control unit 4 performs charging / discharging of the secondary battery 162 and coordination between the main power source and the distributed power source. That is, the cooperative control unit 4 controls the distribution of power from the main power supply and the distributed power supply to the distributed distribution board SPBn. In addition, the structure which converts the output of the solar cell 161, the secondary battery 162, and the fuel cell 163 into alternating current power, and uses it as input power of the alternating current / direct current converter 3 may be employ | adopted.

  The drive voltage (rated voltage) of the DC device 102 is not one type, and there are a plurality of types, for example, 48 volts, 24 volts, 12 volts, and 6 volts. On the other hand, as explained in the prior art, if the voltage is distributed at a low voltage, the influence of the voltage drop due to the wiring resistance becomes large. Therefore, the voltage level of the DC voltage supplied from the main distribution board MPB to each distributed distribution board SPBn is as much as possible. It is desirable to raise it. Therefore, in the present embodiment, the DC voltage output from the AC / DC converter 3 is set to a relatively high value (for example, 100 volts to 60 volts), and is passed through a plurality of DC branch lines Lp branched by the terminal block 5. High-voltage DC power is distributed to the two distributed distribution boards SPBn, and the DC / DC converter 10 provided in each distributed distribution board SPBn converts the DC power into different DC power levels corresponding to the DC devices 102. . For example, the DC / DC converter 10 of the distributed distribution board SPB1 that supplies power to the information equipment system K101 converts the DC power to 12 volts and supplies the illumination system K102 and the intercom system K103 to the distributed distribution board SPB2. The DC / DC converter 10 converts the power into 48 volt DC power, and the DC / DC converter 10 of the distributed distribution board SPB3 that feeds the residential alarm system K104 converts it into 6 volt DC power. The DC / DC converter 10 of the distributed distribution board SPB4 that supplies power to the system K105 converts the DC power to 48 volts. Note that the DC device 102 in which the voltage level output from the AC / DC converter 3 and the drive voltage coincide with each other through the DC branch line Lp branched by the terminal block 5 without passing through the distributed distribution board SPBn. It is also possible to supply high-voltage DC power.

  Thus, as described above, a relatively high level of DC power is distributed from the main distribution board MPB to the distributed distribution boards SPB1 to SPB4, and a DC / DC converter is provided in each of the distributed distribution boards SPB1 to SPB4. 10 can reduce the influence of the voltage drop due to the wiring resistance by converting the DC power to a desired level and supplying the load to the load. As a result, the DC power having different voltage levels can be increased at multiple locations while extending the wiring distance. Can distribute power.

  In the distributed distribution board SPBn, a main switch 11 is connected to the output side of the DC / DC converter 10, and a plurality of electric circuits (buses) connected to the secondary side of the main switch 11 are connected via branch lines. The branch switch 12 is connected, and a DC supply line Wdc is connected to the secondary side of the branch switch 12. The main switch 11 or the main switch 11 and the branch switch 12 are constituted by an earth leakage circuit breaker that performs a tripping operation by detecting a ground fault current (leakage current) that flows when the DC supply line Wdc is grounded.

  As shown in FIG. 2, the main switch 11 in the present embodiment includes a main contact 11a inserted in the electric circuit, an open / close mechanism 11b for opening / closing the main contact 11a, an overcurrent (overload current and short-circuit current), and a ground fault. An abnormal current detecting means 11d for detecting current (leakage current), and when the abnormal current (overcurrent or ground fault current) is detected by the abnormal current detecting means 11d, the switching mechanism 11b is released to open the main contact 11a. The trip part 11c, the signal superimposition part 11e which superimposes and transmits a communication signal on the DC voltage applied to an electric circuit, and the insulating container (not shown) which accommodated these components are provided. However, since such an opening / closing mechanism 11b and the tripping part 11c are well known in the art, illustration and description of a detailed structure are omitted. Further, the abnormal current detection unit 11d is configured by, for example, a current sensor that detects a current flowing in the electric circuit. The branch switch 12 also has a configuration that is substantially the same as that of the main switch 11, and therefore illustration and description thereof are omitted.

  Here, not only the main switch 11 and the branch switch 12, but also the AC / DC converter 3, the cooperative control unit 4, the DC / DC converter 10, the distributed power source (solar cell 161, secondary battery 162, fuel cell 163). ) Are each provided with a communication function for communicating through the DC branch line Lp, and can perform a cooperative operation to cope with a load state including the main power source, the distributed power source, and the DC 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 DC device 102.

  In the present embodiment, when an abnormal current (overcurrent or ground fault current) is detected by the abnormal current detection means 11d provided in the main switch 11, communication for notifying abnormal signal detection from the signal superimposing unit 11e. The signal is transmitted to the home server 116, and the communication signal is transferred from the home server 116 to the notification unit 6 provided in the main distribution board MPB through information wiring (not shown).

  As shown in FIG. 3, the notification unit 6 provided in the main distribution board MPB includes a signal receiving unit 60 that receives a communication signal transmitted through information wiring, and a display having a display device such as a liquid crystal display or an organic EL display. Unit 61, signal discrimination control unit 62 for causing display unit 61 to perform display corresponding to abnormal current detection information included in the communication signal received by signal receiving unit 60, and main switch 11 of each distributed distribution board SPBn. The storage unit 63 that stores the correspondence (data table) between the address assigned to each of the distributed distribution boards SPBn and the identification information (number, installation location, etc.), and sets the correspondence to the storage unit 63. And a setting unit 64. In the notification unit 6, when the communication signal is received by the signal receiving unit 60, the signal switching control unit 62 refers to the data table in the storage unit 63 and detects the abnormal current from the transmission source address of the communication signal 11. Further, the identification information of the distributed distribution board SPBn in which the main switch 11 is installed is acquired, and the identification information (for example, the number of the distributed distribution board SPBn where the abnormal current is detected, the installation location, etc.) is displayed. This is displayed on the unit 61. Therefore, the householder can know the distributed distribution board SPBn in which the abnormal current has flowed from the notification content of the notification unit 6 (identification information displayed on the display unit 61), and can respond quickly.

  Note that the main switch 1 or the main switch 1 and the branch switch 2 housed in the main distribution board MPB are connected to an abnormal current such as a ground fault current (leakage current) or an overcurrent (overload current and short-circuit current). The earth leakage circuit breaker that detects and detects the trip (particularly, the one used for the branch switch 2 is called the earth leakage circuit breaker for the distribution board for houses), and the main switch 1 or any branch switch When the device 2 performs the tripping operation, it may be notified that an abnormal current flows in the main distribution board MPB.

  Incidentally, in the main distribution board MPB (or distributed distribution board SPBn), as shown in FIG. 4, the output terminal T1 on the high potential side (positive electrode) of the AC / DC converter 3 (or DC / DC converter 10). A long plate-like first conductive member 7 connected to the output terminal T2 connected to the output terminal T2 on the low potential side (negative electrode) of the AC / DC converter 3 (or DC / DC converter 10). A second conductive member 8 having a shape and one or more internal devices X electrically connected to the first and second conductive members 7 and 8 are accommodated. A space (space) in which the inner device X is disposed along the longitudinal direction of the conductive members 7 and 8 is provided on the side opposite to the first conductive member 7 (below the second conductive member 8 in FIG. 4). . The internal device X housed in the main distribution board MPB (or the distributed distribution board SPBn) corresponds to a DC device that operates with DC power. Here, since the first conductive member 7 is disposed at a position away from the second conductive member 8 with respect to the arrangement space of the internal unit X, the main distribution board MPB (or the distributed distribution board SPBn). ), The risk of accidentally touching the high-potential side charging unit (first conductive member 7) is reduced when the inner device X is disposed inside.

  Also, in FIG. 4, at the end of the AC / DC converter 3 (or DC / DC converter 10) adjacent to the arrangement space of the internal unit X, the information wiring Ls drawn into the panel from the outside and the AC / DC A network device (for example, a router or a wireless LAN) provided as an internal unit X is provided with an information wiring connection terminal Ts electrically connected inside the conversion device 3 (or the DC / DC conversion device 10). Adapter etc.) can be connected to the home network. With such a configuration, the information wiring Ls drawn in the board is routed in the board as compared with the case where the information wiring Ls drawn in the board is directly connected to the network device X housed in the board as an internal unit. There is an advantage that labor can be saved. If necessary, the network device and the information device system K101 are connected by information wiring (twisted pair cable).

  By the way, as shown in FIG. 5, a DC voltage having a voltage level different from that of the first high potential side output terminal T1 is output to the low potential side output terminal T2 on the opposite side to the high potential side output terminal T1. If the second high-potential side output terminal T3 is provided in the AC / DC converter 3 (or DC / DC converter 10), an internal device having a different voltage level may be provided as required in the main distribution board MPB (or the distributed component). It can be arranged in the electrical panel SPBn). For example, as shown in FIG. 6, a plurality (three in the illustrated example) of branch switches 13 are arranged as internal units, and the DC device 102 and the distributed distribution board SPB1 have the same voltage level (first voltage level). ), And DC power having a second voltage level different from the first voltage level may be supplied to the distributed distribution boards SPB2, SPB3, and SPB4.

  At this time, the potential difference between one output terminal (output terminal T3 in FIG. 5) and the other output terminals (output terminals T1 and T2 in FIG. 5) arranged closest to the inner unit is arranged far from the inner unit. It is desirable that the output terminal be larger. For example, when the output voltage of the AC / DC converter 3 (or DC / DC converter 10) is plus 24 volts and minus 24 volts, the output terminal T3 is minus 24 volts with the output terminal T2 as a reference (0 volts), If the output terminal T1 is set to plus 24 volts, the potential difference between the output terminals T3 and T2 is 24 volts, and the potential difference between the output terminals T3 and T1 is 48 volts. Alternatively, when the output voltage of the AC / DC converter 3 (or DC / DC converter 10) is plus 24 volts and plus 48 volts, the output terminal T2 is plus 24 volts with the output terminal T3 as a reference (0 volts), If the output terminal T1 is set to plus 48 volts, the potential difference between the output terminals T3 and T2 is 24 volts, and the potential difference between the output terminals T3 and T1 is 48 volts. When the output voltage of the AC / DC converter 3 (or DC / DC converter 10) is plus 24 volts and plus 300 volts, the output terminal T2 is plus 24 volts with the output terminal T3 as a reference (0 volts), If the output terminal T1 is set to plus 300 volts, the potential difference between the output terminals T3 and T2 is 24 volts, and the potential difference between the output terminals T3 and T1 is 300 volts. Alternatively, when the output voltage of the AC / DC converter 3 (DC / DC converter 10) is plus 300 volts and minus 24 volts, the output terminal T3 is minus 24 volts with the output terminal T2 as a reference (0 volts), If the output terminal T1 is set to plus 300 volts, the potential difference between the output terminals T3 and T2 is 24 volts, and the potential difference between the output terminals T3 and T1 is 324 volts.

  Thus, as described above, the potential difference between one output terminal (output terminal T3 in FIG. 5) and the other output terminals (output terminals T1 and T2 in FIG. 5) arranged closest to the internal unit is from the internal unit. If the other output terminals arranged farther are made larger, even if the operator touches the output terminals T3-T2 when installing the internal unit, the potential difference between the output terminals T3-T2 is relatively low. Since it is set, it is possible to improve the safety of work when installing the internal unit. In the above description, the case where there are two types of output voltages of the AC / DC converter 3 (or the DC / DC converter 10) has been described. Safety can be improved.

  By the way, as shown in FIG. 1 and FIG. 6, DC power of the same voltage level (first voltage level) is supplied to the information equipment system K101, the lighting system K102, and the intercom system K103, and the house alarm system K104 and the lighting are supplied. In the configuration in which DC power having a second voltage level different from the first voltage level is supplied to the system K105, the rated capacities (rated currents) of the respective subsystems K101 to K105 are often different. For example, if the residential alarm system K104 and the lighting system K105 are compared, it is generally considered that the lighting system K105 has a higher rated current. Therefore, it is desirable that the current level of the DC / DC converter 10 in each of the distributed distribution boards SPBn be a value corresponding to the rated current of each of the subsystems K101 to K105 fed via the DC supply line Wdc. That is, when DC power is supplied from a common DC supply line Wdc to loads having different capacities (rated currents), the overcurrent protection level of the circuit breaker (branch switch 12) is higher than the rated current of the large capacity load. If it is set, overload protection is not possible for small-capacity loads.On the other hand, if the overcurrent protection level is set lower than the rated current for large-capacity loads, the circuit breaker will not operate even if overcurrent protection is possible Although the DC supply line Wdc may be frequently interrupted, if the current level of the DC / DC converter 10 is different for each distributed distribution board SPBn, it is installed on the output side of the DC / DC converter 10. The level of overcurrent protection in the circuit breaker (branch switch 12) can be set to an appropriate level for each load (subsystems K101 to K105 in the illustrated example). A circuit breaker having an overcurrent protection level corresponding to the rated current of the load fed to each of the plurality of branch switches 12 provided on the output side of the DC / DC converter 10 via the DC supply line Wdc is provided. If used, the output current level of the DC / DC converter 10 can be made substantially different for each of the plurality of DC supply lines Wdc.

  Alternatively, a plurality of DC / DC converters 10 capable of supplying DC power at a voltage level and current level corresponding to the rated voltage and rated current of the subsystems K101 to K105 that receive power supply through each DC supply line Wdc are distributed. You may store in electrical board SPBn. Thus, if the rated current (current level) is changed for each DC supply line Wdc, energy saving can be achieved by selecting the DC / DC converter 10 that maximizes the efficiency in accordance with the rated current of the load. There is an advantage.

It is a system configuration figure showing an embodiment of the present invention. It is a block diagram which shows the main switch in the same as the above. It is a block diagram which shows the alerting | reporting part in the same as the above. It is the schematic block diagram which a part of which showed the main distribution board same as the above was abbreviate | omitted. It is the schematic block diagram which a part of which showed the other main distribution board same as the above was abbreviate | omitted. It is the other system block diagram which abbreviate | omitted a part same as the above.

Explanation of symbols

MPB main distribution board SPB1 to SPB4 Distributed distribution board 3 AC / DC converter 10 DC / DC converter

Claims (9)

  A main distribution board that houses an AC / DC converter that converts AC power supplied from an AC power system into DC power, and a DC that converts DC power supplied from the main distribution board to a desired level of DC power / A plurality of distributed distribution boards containing DC converters, and a leakage current detection means for detecting leakage current flowing in the power supply path is provided in at least one of the main distribution board and the distributed distribution board. In addition to notifying that the leakage current has been detected by the current detection means, it is provided with notification means for notifying the distribution board identification information provided with the leakage current detection means for detecting the leakage current. DC power distribution system.   A main distribution board that houses an AC / DC converter that converts AC power supplied from an AC power system into DC power, and a DC that converts DC power supplied from the main distribution board to a desired level of DC power A plurality of distributed distribution boards containing DC converters, and overcurrent detection means for detecting overcurrent flowing through the power supply path is provided on at least one of the main distribution board and the distributed distribution board. In addition to notifying that the overcurrent has been detected by the current detection means, it is provided with notification means for notifying the distribution panel identification information provided with the overcurrent detection means for detecting the overcurrent. DC power distribution system.   4. The DC power distribution system according to claim 2, wherein the notification means is provided in a main distribution board.   The DC power distribution system according to any one of claims 1 to 3, wherein voltage levels of DC power output from DC / DC converters housed in a plurality of distributed distribution boards are different from each other.   At least one of the main distribution board and the distributed distribution board includes an AC / DC converter, a first conductive member connected to an output terminal on the high potential side of the DC / DC converter, and an AC / DC converter. Alternatively, a second conductive member connected to the output terminal on the low potential side of the DC / DC converter and one or more internal units electrically connected to at least one of the first and second conductive members. 5. The DC power distribution system according to claim 1, wherein the internal unit is disposed on the opposite side of the first conductive member with respect to the second conductive member.   At least one of the AC / DC converter and the DC / DC converter is connected to an information wiring drawn into the distribution board from outside and connected to the information wiring electrically connected to the information wiring 6. The information wiring connection terminal is provided on a side opposite to the output terminal on the high potential side with respect to the output terminal on the low potential side, and is connected to the internal unit. DC power distribution system.   At least one of the AC / DC converter and the DC / DC converter has a plurality of output terminals, and the potential difference of the other output terminal with respect to one output terminal arranged closest to the inner unit is different from the inner unit. The DC power distribution system according to claim 5 or 6, wherein the output terminal is further increased as the output terminals are further distant from each other.   8. A load to which DC power is supplied together with the DC / DC converter of the distributed distribution board is connected to the output side of the AC / DC converter of the main distribution board. The DC power distribution system according to item 1.   The DC power distribution system according to any one of claims 1 to 8, wherein current levels of DC power output from the DC / DC converters are different from each other.

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