JP2009178030A - Dc power distribution system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To distribute DC power to various positions by using an existing AC distribution board, and to reduce the risk of accidental contact on a charging portion on the high potential side when arranging inner equipment in a DC distribution board. <P>SOLUTION: The DC distribution board SPBn houses a first conductive member 14 connected to an output terminal T1 on the high potential side (positive electrode) of an AC-DC converter 10, a second conductive member 15 connected to an output terminal T2 on the low potential side (negative electrode) of the AC-DC converter 10, and the inner equipment electrically connected to the first and second conductive member 14 and 15. The inner equipment is arranged at the opposite side of the first conductive member 14 to the second conductive member 15. The first conductive member 14 is disposed at a position distant from the second conductive member 15 to the inner equipment, so that the risk of accidental contact on the charging portion (the first conductive member 14) on the high potential side is reduced when arranging the inner equipment in the DC distribution board SPBn. <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

  By the way, as a configuration for converting AC power into DC power, there is an AC / DC conversion device including an AC / DC converter using a switching power supply device in addition to the combination of a transformer and a rectifier as in the conventional example. However, when DC power is fed from one AC / DC converter to all indoor DC devices, the capacity required for the AC / DC converter increases, and the existing AC distribution board has a large capacity. There is a possibility that the AC / DC converter cannot be accommodated.

  Therefore, the present applicant has already proposed a DC distribution system in which a plurality of DC distribution boards containing AC / DC converters are provided below the existing AC distribution board, and DC power is distributed to multiple locations. ing. Here, when a switch or other internal unit is housed in the DC distribution board, there is a risk of accidentally touching the high potential side charging unit.

  The present invention has been made in view of the above circumstances. The purpose of the present invention is to distribute DC power to multiple locations while using an existing AC distribution board, and within the DC distribution board. It is an object of the present invention to provide a DC power distribution system that reduces the risk of accidentally touching a charged part on the high potential side when arranging an internal unit.

  In order to achieve the above object, the invention according to claim 1 is an alternating current housing a main switch having a primary side connected to an AC power system and a plurality of branch switches branch-connected to a secondary side of the main switch. A distribution board, and a plurality of DC distribution boards containing an AC / DC converter for converting AC power supplied via the AC distribution board into DC power, and the DC distribution board is AC / DC A first conductive member connected to the output terminal on the high potential side of the converter, a second conductive member connected to the output terminal on the low potential side of the AC / DC converter, and the first and second conductive members One or a plurality of internal units electrically connected to at least one of the members, and the internal unit is disposed on the opposite side of the first conductive member with respect to the second conductive member. .

  According to the invention of claim 1, it is possible to distribute DC power to multiple locations while using an existing distribution board for AC distribution (AC distribution panel), and to arrange an internal unit in the DC distribution panel In doing so, there is less risk of accidentally touching the high potential side charging section (first conductive member).

  According to a second aspect of the present invention, in the first aspect of the present invention, the AC / DC converter is connected to an information wiring that is externally drawn into the DC distribution board and is electrically connected to the information wiring. The connection terminal for information wiring is provided on the 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.

  According to invention of Claim 2, the communication apparatus which communicates via information wiring can be arrange | positioned in a DC distribution board as an internal unit.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the AC / DC converter has a plurality of output terminals, and is arranged between one output terminal and another output terminal arranged closest to the internal unit. The potential difference becomes larger as the other output terminal is arranged farther from the inner unit.

  According to the third aspect of the present invention, internal units having different voltage levels can be arranged in the DC distribution board as required.

  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 AC / DC converters housed in the plurality of DC distribution boards are different from each other. And

  According to the invention of claim 4, it is possible to distribute various types of DC power having different voltage levels.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the leakage current detection means for detecting the leakage current flowing in the power feeding path is provided in at least one of the AC distribution board and the DC distribution board. Provided is a notification means for notifying that the leakage current is detected by the leakage current detection means and notifying the distribution board identification information provided with the leakage current detection means for detecting the leakage current. It is characterized by.

  According to the invention of claim 5, it is possible to notify the user by notifying the occurrence of the ground fault and the distribution board (AC distribution board or DC distribution board) in which the ground fault has occurred by the notification means. it can.

  The invention according to claim 6 is the invention according to any one of claims 1 to 4, wherein the overcurrent detection means for detecting an overcurrent flowing through the power supply path is provided in at least one of the AC distribution board and the DC distribution board. Provided is a notification means for notifying that the overcurrent is detected by the overcurrent detection means and notifying the identification information of the distribution board provided with the overcurrent detection means for detecting the overcurrent. It is characterized by.

  According to the invention of claim 6, it is possible to notify the user by notifying the distribution board (AC distribution board or DC distribution board) in which the overcurrent has flowed and the overcurrent has flowed by the notification means. .

  A seventh aspect of the invention is characterized in that, in the fifth or sixth aspect of the invention, the notification means is provided in an AC distribution board.

  The invention of claim 8 is characterized in that, in the invention of any one of claims 1 to 7, the current levels of the DC power output from the respective AC / DC converters are different from each other.

  According to the invention of claim 8, 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 AC / DC converter. In such a case, an AC / 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 is provided. Energy saving can be achieved by selecting.

  ADVANTAGE OF THE INVENTION According to this invention, when using the existing distribution board for alternating current distribution (alternating current distribution board), DC power can be distributed to many places, and when arranging an internal unit in a direct current distribution board There is less risk of accidentally touching the high-potential side charging unit (first conductive member).

  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. 2, the DC power distribution system of the present embodiment includes a main switch 1 whose primary side is connected to an AC power system AC, and a plurality of branch switches 2 that are branched and connected to the secondary side of the main switch 1. Accommodated AC distribution board MPB and a plurality of DC distribution boxes containing AC / DC converters 10 that convert AC power supplied from the branch switch 2 of AC distribution board MPB through AC power supply line Lac into DC power Panels SPB1, SPB2,... However, the existing residential distribution board can be used as it is for the AC distribution board MPB.

  As shown in FIG. 3, the DC distribution board SPBn (n = 1, 2, 3,...) Includes, in addition to the AC / DC converter 10, a main switch 11 including an earth leakage breaker, and a cooperative control unit described later. A plurality of branch switches 12 branch-connected to the secondary side of the main switch 11 are accommodated via 13, and a direct current as a load is connected through a DC supply line Wdc connected to the secondary side of each branch switch 12. DC power is supplied to the device 102.

  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 AC / DC converter 10 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 home server 116 and the AC / DC converter 10 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, an intercom system K103 composed of a DC device 102 for handling visitors and monitoring intruders, a residential alarm system K104 composed of an alarm DC device 102 such as a residential fire alarm, and the like. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The AC / DC converter 10 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 primary side of the main switch 11 is connected to the output side.

  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 including a lighting fixture (DC device 102) arranged in advance in the house H, and a lighting fixture (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 resident 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 10 that generates DC power from AC power. 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 cooperation control unit 13 performs charge / discharge of the secondary battery 162 and cooperation between the main power source and the distributed power source. That is, the cooperative control unit 13 controls the distribution of power from the main power supply and the distributed power supply to the DC device 102. Note that a configuration may be adopted in which the outputs of the solar cell 161, the secondary battery 162, and the fuel cell 163 are converted into AC power and used as input power of the AC / DC converter 10.

  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. Therefore, it is desirable that the DC voltage levels output from the AC / DC converters 10 housed in the plurality of DC distribution boards SPBn are different from each other. For example, when power is supplied from separate DC distribution boards SPB1 to SPB5 for each of the subsystems K101 to K105, the DC / DC converter 10 of the DC distribution board SPB1 that supplies power to the information equipment system K101 has a DC voltage of 12 volts. The DC / DC converters 10 of the DC distribution boards SPB2 and SPB3 that convert to electric power and supply power to the lighting system K102 and the intercom system K103 are each converted to DC power of 48 volts and supplied to the residential alarm system K104. The AC / DC conversion device 10 of the power board SPB4 may convert the DC power to 6 volts, and the AC / DC conversion device 10 of the DC power distribution board SPB5 that feeds the lighting system K105 may convert the power to 48 volts.

  By the way, the main switch 11 or the main switch 11 and the branch switch 12 housed in the DC distribution board SPBn detect and draw a ground fault current (leakage current) that flows when the DC supply line Wdc is grounded. It consists of an earth leakage breaker that performs the removal action.

  As shown in FIG. 4, the main switch 11 in this 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 10, the cooperative control unit 13, and the distributed power source (solar cell 161, secondary battery 162, fuel cell 163) are each supplied with a DC supply line. A communication function for performing communication through Wdc is provided, and it is possible to 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 through the information wiring (not shown) to the notification unit 3 provided in the AC distribution board MPB.

  As shown in FIG. 5, the notification unit 3 provided in the AC distribution board MPB includes a signal receiving unit 30 that receives a communication signal transmitted through an information wiring, and a display having a display device such as a liquid crystal display or an organic EL display. Unit 31, signal discrimination control unit 32 for causing display unit 31 to perform display corresponding to information on abnormal current detection included in the communication signal received by signal receiving unit 30, and main switch 11 of each DC distribution board SPBn Storage unit 33 that stores the correspondence (data table) between the address assigned to the ID and the identification information (number or installation location) of each DC distribution board SPBn, and sets the correspondence to the storage unit 33. And a setting unit 34. And in the alerting | reporting part 3, when the signal receiving part 30 receives a communication signal, the signal discrimination | determination control part 32 refers to the data table of the memory | storage part 33, and the main switch 11 which detected the abnormal electric current from the transmission source address of the communication signal. Further, the identification information of the DC distribution board SPBn where the main switch 11 is installed is acquired, and the acquired identification information (for example, the number or installation location of the DC distribution board SPBn where the abnormal current is detected) is obtained. It is displayed on the display unit 31. Accordingly, the householder can know the DC distribution board SPBn in which the abnormal current has flowed from the notification content of the notification unit 3 (identification information displayed on the display unit 31), and can respond quickly.

  The main switch 1 or the main switch 1 and the branch switch 2 housed in the AC distribution board MPB are caused to have an abnormal current flowing through the AC power supply line Lac, that is, a ground fault current (leakage current) or an overcurrent (excessive current). The earth leakage circuit breaker which detects the load current and the short circuit current and performs the tripping operation (in particular, 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 Alternatively, when any branch switch 2 performs a tripping operation, it may be notified that an abnormal current has flowed in the AC distribution board MPB.

  Incidentally, in the DC distribution board SPBn, as shown in FIG. 6, the first conductive member 14 connected to the output terminal T1 on the high potential side (positive electrode) of the AC / DC converter 10, and the AC / DC converter. A second conductive member 15 connected to the output terminal T2 on the low potential side (negative electrode) 10 and one or more internal units electrically connected to the first and second conductive members 14 and 15; The internal unit is accommodated along the longitudinal direction of the conductive members 14 and 15 on the opposite side of the second conductive member 15 from the first conductive member 14 (below the second conductive member 15 in FIG. 6). A space (space) to be arranged is provided. Examples of the internal unit housed in the DC distribution board SPBn include a DC device (for example, a network device described later) operating with DC power, the main switch 11 or the branch switch 12. Here, since the first conductive member 14 is disposed at a position away from the second conductive member 15 with respect to the arrangement space of the internal unit, the internal unit is disposed in the DC distribution board SPBn. At this time, there is less risk of accidentally touching the high potential side charging unit (first conductive member 14).

  Further, in FIG. 6, the end portion of the AC / DC converter 10 adjacent to the arrangement space of the internal unit is electrically connected to the information wiring Ls drawn from the outside into the panel inside the AC / DC converter 10. The information wiring connection terminal Ts is provided, and a network device X (for example, a router or a wireless LAN adapter) accommodated as an internal unit 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 X and the information device system K101 are connected by information wiring (twisted pair cable).

  By the way, as shown in FIG. 1, 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 side opposite to the high potential side output terminal T1. If the second high potential side output terminal T3 is provided in the AC / DC converter 10, internal units having different voltage levels can be disposed in the DC distribution board as required. For example, a plurality of branch switches 12 are arranged as an internal unit, and DC power of the same voltage level (first voltage level) is provided to the information equipment system K101, the lighting system K102, and the interphone system K103 as shown in FIG. And a DC voltage having a second voltage level different from the first voltage level can be supplied to the house alarm system K104 and the lighting system K105.

  At this time, the potential difference between one output terminal (output terminal T3 in FIG. 1) arranged closest to the internal unit and the other output terminals (output terminals T1, T2 in FIG. 1) is arranged far from the internal unit. It is desirable that the output terminal be larger. For example, when the output voltage of the AC / DC converter 10 is plus 24 volts and minus 24 volts, the output terminal T3 is minus 24 volts and the output terminal T1 is plus 24 volts with the output terminal T2 as a reference (0 volts). For example, 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 10 is plus 24 volts and plus 48 volts, the output terminal T3 is set as a reference (0 volts), the output terminal T2 is plus 24 volts, and the output terminal T1 is plus 48 volts. For example, 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. Further, when the output voltage of the AC / DC converter 10 is plus 24 volts and plus 300 volts, the output terminal T3 is set as a reference (0 volts), the output terminal T2 is plus 24 volts, and the output terminal T1 is plus 300 volts. For example, 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 10 is plus 300 volts and minus 24 volts, the output terminal T3 is minus 24 volts and the output terminal T1 is plus 300 volts with the output terminal T2 as a reference (0 volts). Then, 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. 1) and the other output terminals (output terminals T1 and T2 in FIG. 1) 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 10 has been described, but even when there are three or more types, the safety of work can be improved by adopting the same configuration.

  By the way, as shown in FIG. 3 and FIG. 7, 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, a circuit breaker corresponding to the rated current (for example, 1 ampere) of the home alarm system K104 is used for the branch switch 12 provided in the DC supply line Wdc to the home alarm system K104, and the lighting system K105. For the branch switch 12 provided in the DC supply line Wdc to the circuit, by using a circuit breaker corresponding to the rated current (for example, 5 amperes) of the lighting system K105, the output current level of the AC / DC converter 10 is Can be made substantially different for each of the plurality of DC supply lines 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 The DC supply line Wdc may be frequently interrupted, but with the above-described configuration, overcurrent protection is provided for a circuit breaker (branch switch 12) installed on the output side of the AC / DC converter 10. The level can be set to a suitable level for each load (in the illustrated example, each subsystem K101 to K105).

  Alternatively, a plurality of AC / 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 the respective DC supply lines Wdc are divided into DC components. 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 AC / DC converter 10 that maximizes the efficiency in accordance with the rated current of the load. There is an advantage.

It is the schematic block diagram which abbreviate | omitted one part which shows the direct current distribution board in embodiment of this invention. It is a system configuration figure showing an embodiment of the present invention. It is a system configuration diagram in which a part is omitted. 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 general | schematic block diagram which abbreviate | omitted partially which shows the other DC distribution board in the same as the above. It is the other system block diagram which abbreviate | omitted a part same as the above.

Explanation of symbols

MPB AC distribution board SPB1 to SPB4 DC distribution board 10 AC / DC converter 11 Main switch (internal unit)
T1 High potential output terminal T2 Low potential output terminal

Claims (8)

  Supplied via an AC distribution board containing a main switch whose primary side is connected to an AC power system, a plurality of branch switches branched and connected to the secondary side of the main switch, and an AC distribution board A plurality of DC distribution boards that house AC / DC converters that convert AC power into DC power, and the DC distribution boards are connected to an output terminal on the high potential side of the AC / DC converters. A conductive member, a second conductive member connected to the output terminal on the low potential side of the AC / DC converter, and one or more electrically connected to at least one of the first and second conductive members A DC power distribution system comprising: an internal unit, wherein the internal unit is disposed on the opposite side of the first conductive member with respect to the second conductive member.   The AC / DC converter has an information wiring connection terminal electrically connected to the information wiring and connected to the information wiring drawn into the DC distribution board from the outside. 2. The DC power distribution system according to claim 1, wherein the DC power distribution system 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 connected to the internal unit.   The AC / DC converter has a plurality of output terminals, and the potential difference between one output terminal arranged closest to the internal unit and the other output terminal becomes larger as the other output terminal arranged far from the internal unit. The DC power distribution system according to claim 1 or 2, characterized in that   The DC power distribution system according to any one of claims 1 to 3, wherein voltage levels of DC power output from AC / DC converters housed in a plurality of DC distribution boards are different from each other.   Leakage current detection means for detecting the leakage current flowing in the power supply path is provided in at least one of the AC distribution board and the DC distribution board, notifying that the leakage current is detected by the leakage current detection means, and leaking 5. The DC power distribution system according to claim 1, further comprising a notification unit that notifies identification information of the distribution board provided with a leakage current detection unit that detects a current. 6.   Overcurrent detection means for detecting an overcurrent flowing through the power supply path is provided in at least one of the AC distribution board and the DC distribution board, and notifies that the overcurrent is detected by the overcurrent detection means. 5. The DC power distribution system according to claim 1, further comprising a notification unit that notifies identification information of the distribution board provided with an overcurrent detection unit that detects a current. 6.   4. The DC power distribution system according to claim 2, wherein the notification means is provided in an AC distribution board.   The DC power distribution system according to any one of claims 1 to 7, wherein current levels of DC power output from the AC / DC converters are different from each other.

Images