JP4981650B2 - Power distribution system - Google Patents

Description

  The present invention relates to a power distribution system that supplies power to a plurality of electric devices.

  Conventionally, as a system for managing a plurality of electrical devices, Patent Literature 1 discloses a lighting control system in which a network communication control center and a lighting circuit constituting a lighting fixture are connected to a network via a communication interface. ing. In the lighting circuit, a rectifier circuit is connected to both ends of the power supply, and a PFC circuit that suppresses input distortion and creates a DC power supply is connected to the output of the rectifier circuit. A detection circuit for detection is provided. The voltage value and current value detected by the detection circuit are transmitted to the network communication control center via the communication interface and the network. In the network communication control center, when the voltage value and the current value detected by the detection circuit are received, the calculation is performed to calculate the instantaneous or average power.

According to such a system of Patent Literature 1, it is possible to acquire the power consumption state of a lighting fixture in a remote place periodically or at a necessary timing via a network, and the usage status of the lighting fixture, a lamp, etc. It is possible to integrate or estimate whether the load is not lit or not, and how much electricity fee will be paid within a predetermined period, stop the operation of the circuit, and control the output.
JP 2003-68475 A (paragraphs 0048 to 0051 and FIG. 10)

  However, the conventional system including the illumination control system of Patent Document 1 does not consider the impedance of the power supply line or the impedance of the electrical device connected to the power supply means rather than the electrical device. Depending on the number of connected devices, the voltage drop value of the farthest electrical device becomes large, and the power reception voltage received by this electrical device becomes lower than the operation voltage necessary for the operation.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a power distribution system that can prevent the life of each electrical device from being shortened and that does not cause loss due to power conversion. It is in.

  The invention of claim 1 is a power distribution system comprising power supply means for supplying DC power to a plurality of electrical devices connected to one power supply line and each driven by DC power supply. Detecting means for detecting a received voltage received by an electric device connected to a connection path distance farthest from the power supply means, receiving the received voltage from the detecting means, and receiving the received received voltage Calculation means for calculating a voltage drop value by subtracting from a set voltage of the power supply means; and control means for estimating the remaining usable power in the power supply line using the voltage drop value calculated by the calculation means; It is characterized by providing.

  According to a second aspect of the present invention, in the first aspect of the invention, the plurality of electric devices are all the same, and the control means can be connected to the power supply line using the remaining usable power. Estimating the number of electrical devices, and the number of electrical devices that are driven simultaneously among the plurality of electrical devices is equal to or less than the estimated number, so as to reduce the difference between the cumulative energization time of each other in the plurality of electrical devices, The combination of the electric devices that are driven simultaneously is changed.

  According to a third aspect of the present invention, in the power distribution system according to the second aspect, the plurality of electrical devices are all the same lighting load, and the cumulative energization time is a cumulative lighting time obtained by accumulating the lighting time of the lighting load. It is characterized by.

  According to a fourth aspect of the present invention, in the second or third aspect of the present invention, the plurality of electrical devices have a life time that is a limit value of an allowable use time changed by the received voltage, and the plurality of electrical devices are mutually connected. It is characterized by comprising connection order change notification means for performing notification for changing the connection order of the plurality of electrical devices on the power supply line so as to reduce the difference in lifetime.

  The invention of claim 5 is the invention of any one of claims 1 to 4, further comprising connectable device notifying means for notifying a newly connectable electrical device in accordance with the remaining usable power. And

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, when the electric device is newly connected beyond the remaining usable power, the control means Control is performed so that DC power is not supplied to the connected electrical device.

  According to the first aspect of the present invention, the remaining usable power in the power supply line is estimated by using the voltage drop value of the electric device farthest from the power supply means, for example, so as not to exceed the estimated usable power. It is possible to control the connection of electrical equipment and to notify the user by informing the estimation result, thus preventing the received voltage of each electrical equipment from being lower than the operating voltage required for operation and shortening the service life. can do. In addition, since DC power is supplied to each of a plurality of electrical devices, there is no need to convert AC power to DC power as in the case where AC power is supplied, so loss due to power conversion occurs. do not do.

  According to the second aspect of the present invention, each electric device has a lifetime by controlling the combination of electric devices that are driven simultaneously so that the difference in accumulated energization time is reduced within a range that does not exceed the usable power in the DC supply line. Can be made equal and longer.

  According to the invention of claim 3, it is possible to control the lifetime of each lighting load that is visually noticeable to the user.

  According to invention of Claim 4, a user changes the connection order on the electric power supply line of a some electric equipment by alert | reporting so that the connection order on the electric power supply line of several electric equipment may be changed. Therefore, it is possible to prevent a variation in lifetime due to the received voltage between the electric devices.

  According to the invention of claim 5, it is possible to prevent an electrical device that exceeds the remaining usable power from being connected.

  According to the sixth aspect of the present invention, when DC power is supplied to all newly connected electric devices and the remaining usable power is exceeded, DC power is supplied to the newly connected electric devices. This can be prevented.

(Embodiment 1)
First, the structure of the power distribution system of Embodiment 1 is demonstrated using FIGS. The embodiments described below are described assuming a detached house as a building to which the present invention is applied, but this does not preclude the application of the technical idea of the present invention to an apartment house. As shown in FIG. 1, the house H is provided with a DC power supply unit 101 that outputs DC power and a DC device 102 as a load driven by the DC power, and an output end of the DC power supply unit 101. DC power is supplied to the DC device 102 through the DC supply line Wdc connected to the. A current flowing through the DC supply line Wdc is monitored between the DC power supply unit 101 and the DC device 102. When an abnormality is detected, power is supplied from the DC power supply unit 101 to the DC 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.

  When the power supply path and the communication path are combined as described above, it is not necessary to provide a separate communication path from the power supply path in order to perform communication between the devices. It can be carried out.

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

  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 consisting of DC device 102 for dealing with visitors and monitoring intruders (not shown, but not limited to the entrance, between intrusion monitoring crime prevention system for monitoring window opening / closing and window destruction) ), And a residential alarm system K104 including an alarm DC device 102 such as a fire detector. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The DC breaker 114 described above is provided in association with the subsystem. In the illustrated example, four DC are associated with the information device system K101, the lighting system K102 and the intercom 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 intercom system K103.

  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 “outlet part”.

  These outlets are plug-in connection ports into which contacts (plugs) (not shown) provided directly on the DC device 102 or contacts (plugs) (not shown) provided via connection wires are inserted. Has a structure in which the container body holds a contact receiver that directly opens contact with the contact element inserted into the connection port. That is, the outlet portion supplies power in a contact manner. When the DC device 102 connected to the outlet unit 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 outlet portion. Note that the contact (plug) provided directly on the DC device 102 or the contact (plug) provided via the connection line is not only detachably connectable to the DC outlet 131 but also attached to the hooking ceiling 132. The thing which can be connected freely is also included.

  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 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 devices are configured to support periodic polling monitoring. Receive monitoring and 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 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 117. Therefore, the user (contractor or householder) of the home server 116 can monitor and 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 basically 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.

  The DC power supply unit 101 is provided with a secondary battery 162 in preparation for a period in which power is not supplied from the AC power supply AC (for example, a power failure period of the commercial power supply AC). It is also possible to use a solar cell 161 or a fuel cell 163 that generates DC power. The solar battery 161, the secondary battery 162, and the fuel battery 163 are distributed power supplies with respect to the main power supply including the AC / DC converter 112 that generates DC power from the AC power supply 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 source or other distributed power source, and the secondary battery 162 is discharged not only in a period in which power is not supplied from the AC power source AC but also in a timely manner as necessary. The coordination control unit 113 performs charge / discharge of the secondary battery 162 and coordination between the main power source and the distributed power source. That is, the cooperative control unit 113 functions as a DC power control unit that controls the distribution of power from the main power source and the distributed power source constituting the DC power supply unit 101 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 112.

  Since the driving voltage of the DC device 102 is selected from a plurality of types of voltages according to 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 DC device 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 AC / DC converter 112, the cooperative control unit 113, the DC breaker 114, the solar cell 161, the secondary battery 162, and the fuel cell 163 described above are provided with communication functions, and include a main power source, a distributed power source, and a DC device 102. It is possible to perform cooperative operations that deal with the load status. 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 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 DC device 102 that uses DC power and 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. 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, in the power distribution system according to the present embodiment, between a plurality of DC devices 102 connected on one DC supply line Wdc and a DC power supply unit 101 that supplies DC power to these DC devices 102. The power supply and communication will be described in detail with reference to FIGS. Here, the plurality of DC devices 102, 102, 102 of FIG. 2 constitute the lighting system K 102 and the house alarm system K 104 of FIG.

  First, the configuration of each DC device 102 will be described with reference to FIG. The DC device 102 individually has device identification information (device ID) for identifying the device type, is directly connected to the DC supply line Wdc, and is supplied with DC power from the DC power supply unit 101 via the DC supply line Wdc. The voltage detection unit 30 that detects the received voltage received from the DC power supply unit 101, the communication unit 31 that communicates with the DC power supply unit 101, and the units 30 and 31 are driven. And a control unit 32 for controlling.

  As shown in FIG. 4, such a DC device 102 has a minimum use range voltage A, and if the received voltage from the DC power supply unit 101 becomes lower than the minimum use range voltage A, it is more than necessary inside the device. As a result, the service life is shortened. Therefore, the DC device 102 needs to be driven with a voltage that is equal to or higher than the minimum voltage A in the use range so that the lifetime is not shortened.

  Next, the configuration of the DC power supply unit 101 will be described with reference to FIG. The DC power supply unit 101 includes a communication unit 40 that performs communication with each DC device 102, a calculation unit 41 that performs an operation described later, and a control unit 42 that controls the units 40 and 41.

  The communication unit 40 receives device identification information and a received voltage from each DC device 102.

  For each DC device 102, the calculation unit 41 calculates a voltage drop value by subtracting the received voltage from the set voltage of the DC power supply unit 101 (supply voltage supplied toward each DC device 102).

  For each DC device 102, the control unit 42 connects the DC device 102 having the maximum voltage drop value among the voltage drop values calculated by the calculation unit 41 to the connection path distance farthest from the DC power supply unit 101. Estimated as DC equipment (the farthest DC equipment). The control unit 42 that has estimated the farthest DC device 102 compares the voltage drop value of the farthest DC device 102 with a threshold value, and if the voltage drop value is smaller than the threshold value, estimates the remaining usable power in the DC supply line Wdc. Then, the estimation result is displayed on the display unit 117 via the communication unit 40. On the other hand, when the voltage drop value is equal to or greater than the threshold value, the control unit 42 stops the power supply to the farthest DC device 102.

  Here, a method for estimating the remaining usable power in the DC supply line Wdc will be described. Since the DC supply line Wdc is disposed in the house H in advance, the length of the DC supply line Wdc is known. Therefore, using the length of the DC supply line Wdc and the impedance per unit length, a position where the new DC device 102 is likely to be connected from the DC power supply unit 101 (from the DC power supply unit 101 to the furthest DC device 102). The impedance of the DC supply line Wdc can be calculated. When the new DC device 102 is connected, the voltage drop value of the farthest DC device 102 can be calculated by using the impedance of the DC supply line Wdc and the power consumption of the new DC device 102. . From this calculation result, the remaining usable power in the DC supply line Wdc can be estimated.

  These data may be registered in advance in the DC power supply unit 101 as a data table in association with the voltage drop value of the farthest DC device 102. At the time of estimation, the voltage drop value of the farthest DC device 102 can be checked against the data table, and the remaining usable power in the DC supply line Wdc can be estimated.

  Next, the operation of this embodiment will be described with reference to FIGS. First, a plurality of DC devices 102, 102, 102 are connected to the DC supply line Wdc (S1 in FIG. 6). The DC device 102 connected to the DC supply line Wdc transmits its own device identification information to the DC power supply unit 101, and the DC power supply unit 101 acquires the device identification information from each DC device 102 (S2). Thereafter, each DC device 102 detects its own power reception voltage and transmits the detected power reception voltage to the DC power supply unit 101. The DC power supply unit 101 acquires the received voltage from each DC device 102 (S3), and subtracts the received voltage from the set voltage (supply voltage supplied to each DC device 102) for each DC device 102 to drop the voltage. A value is calculated (S4). Here, the DC power supply unit 101 estimates the DC device 102 having the maximum voltage drop value as the DC device 102 farthest from itself. The DC power supply unit 101 compares the voltage drop value of the farthest DC device 102 with a threshold value (S5), and if the voltage drop value is smaller than the threshold value, estimates the remaining usable power in the DC supply line Wdc (S6). ), The estimation result is displayed on the display unit 117 (S7). On the other hand, if the voltage drop value is greater than or equal to the threshold value, the DC power supply unit 101 stops supplying power to the farthest DC device 102 (S8), and returns to step S3.

  As described above, according to the present embodiment, the remaining usable power in the DC supply line Wdc is estimated by using the voltage drop value of the DC device 102 farthest from the DC power supply unit 101, for example, estimated estimated usable power. The connection of the DC device 102 can be controlled so as not to exceed the value, and the estimation result can be notified to prompt the user, so that the received voltage of each DC device 102 becomes lower than the operating voltage necessary for the operation and the lifetime is reached. Can be prevented from becoming shorter. Moreover, since direct current power is supplied to each of the plurality of direct current devices 102, it is not necessary to convert alternating current power into direct current power as in the case where alternating current power is supplied. Does not occur.

(Embodiment 2)
In the power distribution system of the second embodiment, as shown in FIG. 7, the plurality of DC devices 102 are all the same lighting load (first to fourth lighting loads 51 to 54), and the DC power supply unit 101 shown in FIG. The control unit 42 estimates the number of lighting loads that can be connected to the DC supply line Wdc using the remaining usable power, and the number of lighting loads 51 to 54 that are simultaneously turned on among the plurality of lighting loads 51 to 54. The power distribution system according to the first embodiment is different from the distribution system according to the first embodiment in that the combination of the lighting loads 51 to 54 that are simultaneously turned on is changed so that the difference between the accumulated lighting times of the plurality of lighting loads 51 to 54 becomes small. It is different. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 7, there are four lighting loads 51 to 54 according to the present embodiment, but the control unit has two lighting loads 51 to 54 that can be turned on simultaneously by the remaining usable power in the DC supply line Wdc. If the same two lighting loads 51 to 54 are always lit when estimated at 42, only the lighting load to be lit will have an early life.

  Accordingly, the control unit 42 of the present embodiment reduces the lighting loads 51 to 51 so that the difference between the cumulative lighting times of the lighting loads 51 to 54 is reduced, that is, the cumulative lighting times of the lighting loads 51 to 54 are the same. 54 combinations are controlled. For example, as shown in FIG. 8, the cumulative lighting time of the first lighting load 51 (“1” in FIG. 8) is 750 hours, and the cumulative lighting time of the second lighting load 52 (“2” in FIG. 8). When the cumulative lighting time of the third lighting load 53 (“3” in FIG. 8) is 755 hours and the cumulative lighting time of the fourth lighting load 54 (“4” in FIG. 8) is 760 hours, The control unit 42 transmits a permission signal permitting power reception to the first lighting load 51 and the third lighting load 53 having a short cumulative lighting time among the first to fourth lighting loads 51 to 54, and The first and third lighting loads 51 and 53 receive the permission signal, receive power from the DC power supply unit 101, and turn on. On the other hand, since the second and fourth lighting loads 52 and 54 are not permitted, they cannot receive power. After the first and third lighting loads 51 and 53 are lit for 10 hours, the cumulative lighting time of the first lighting load 51 is 760 hours, the cumulative lighting time of the third lighting load 53 is 765 hours, The difference between the cumulative lighting time of the third lighting loads 51 and 53 and the second and fourth lighting loads 52 and 54 is reduced.

  As described above, according to the present embodiment, by controlling the combination of the lighting loads 51 to 54 that are simultaneously turned on within a range not exceeding the usable power in the DC supply line Wdc, the difference in the cumulative lighting time is reduced. The time when the lighting loads 51 to 54 reach the end of their lives can be made equal and longer.

  As a modification of the second embodiment, the DC device 102 may be a device other than the lighting load. Examples of devices other than the DC device 102 include a ventilation fan and an air conditioner. By controlling such a DC device 102 so that the difference in accumulated energization time is reduced, the combination of electric devices that are simultaneously driven is controlled within a range that does not exceed the usable power in the DC supply line Wdc. The period when the lifetime of 102 can be made equal and long.

(Embodiment 3)
In the power distribution system of the third embodiment, after the total power consumption is estimated in the first embodiment, the combination of the DC devices 102 within a range not exceeding the total power consumption is given priority when the number of DC devices 102 is given priority. explain. Here, three types of DC devices 102 with power consumption of 2 W, 3 W, and 5 W are connectable, and these pieces of information are stored in the control unit 42. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  For example, when the remaining usable power in the DC supply line Wdc is 10 W, the control unit 42 gives priority to the number of DC devices 102 and controls to connect five DC devices 102 with power consumption of 2 W, That effect is displayed on the display 117.

  As described above, according to the present embodiment, as many DC devices 102 as possible can be connected on one DC supply line Wdc.

(Embodiment 4)
In the power distribution system of the fourth embodiment, after the total power consumption is estimated in the first embodiment, priority is given to the DC device 102 having the higher power consumption in the combination of the DC devices 102 within a range not exceeding the total power consumption. Explain the case. Here, three types of DC devices 102 with power consumption of 2 W, 3 W, and 5 W are connectable, and these pieces of information are stored in the control unit 42. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  For example, when the remaining usable power in the DC supply line Wdc is 10 W, the control unit 42 gives priority to the DC device 102 with large power consumption from the stored information, and the DC device 102 with power consumption of 5 W. Are connected to each other, and that effect is displayed on the display 117.

  As described above, according to the present embodiment, it is possible to additionally connect the DC device 102 that consumes as much power as possible on one DC supply line Wdc.

(Embodiment 5)
The power distribution system of the fifth embodiment is different from that of the first embodiment in that each DC device 102 is connected to a DC outlet 131 as shown in FIG. 9 instead of directly connecting each DC device 102 to the DC supply line Wdc. It is different from the power distribution system. The same applies to the case of connecting to the hook ceiling 132 (see FIG. 1) instead of the DC outlet 131.

  Here, the configuration of the DC outlet 131 of the present embodiment will be described with reference to FIG. The same applies to the hook ceiling 132. The DC outlet 131 (hook ceiling 132) has individual outlet identification information and is connected to the DC device 102. The DC connector 102 is detachably connected to the plug of the DC device 102, and the DC The voltage detection part 61 which detects the voltage supplied from the electric power supply part 101, the communication part 62 which communicates between the direct-current power supply parts 101, and the control part 63 which controls each part 60-62 are provided. .

  The communication unit 62 transmits its own outlet identification information to the DC power supply unit 101 in response to a control signal from the DC power supply unit 101, and uses the voltage detected by the voltage detection unit 61 as a power reception voltage for the DC device 102. Send.

  On the other hand, in the DC power supply unit 101 of the present embodiment, the outlet identification information and the installation location of the DC outlet 131 are managed in association with each DC outlet 131.

  Here, in the present embodiment, a method for estimating the remaining usable power in the DC supply line Wdc will be described. Since each DC outlet 131 is arranged in the house H in advance, the length of the DC supply line Wdc from the DC power supply unit 101 to each DC outlet 131 can be known. Accordingly, using the length of the DC supply line Wdc and the impedance per unit length, the DC supply line Wdc from the DC power supply unit 101 to the DC outlet 131 (empty DC outlet 131) to which the DC device 102 is not connected. Can be calculated. When a new DC device 102 is connected to a vacant DC outlet 131, the voltage drop value of the farthest DC device 102 is obtained by using the impedance of the DC supply line Wdc and the power consumption of the new DC device 102. Can be calculated. From this calculation result, the remaining usable power in the DC supply line Wdc can be estimated.

  These data may be registered in advance in the DC power supply unit 101 as a data table in association with the voltage drop value of the farthest DC device 102. At the time of estimation, the voltage drop value of the farthest DC device 102 can be checked against the data table, and the remaining usable power in the DC supply line Wdc can be estimated.

  Next, the operation of this embodiment will be described with reference to FIGS. Although the case where each DC device 102 is connected to the DC outlet 131 will be described here, the same operation is performed when each DC device 102 is connected to the hooking ceiling 132 (see FIG. 1).

  First, the plurality of DC devices 102, 102, 102 are connected to the DC outlet 131 (S11 in FIG. 11). Each DC outlet 131 connected to the DC device 102 transmits its own outlet identification information to the DC power supply unit 101, and the DC power supply unit 101 acquires the outlet identification information from each DC outlet 131 (S12). Thereafter, the DC power supply unit 101 transmits a control signal to the DC outlet 131 installed at a position farthest from the DC power supply unit 101 so as to transmit the received voltage of the DC device 102 connected thereto. The DC outlet 131 farthest from the DC power supply unit 101 detects the received voltage of the DC device 102 connected to itself, and transmits the detected received voltage to the DC power supply unit 101. The DC power supply unit 101 acquires the received voltage from the farthest DC outlet 131 (S13), and subtracts the acquired received voltage from the set voltage (supply voltage supplied toward each DC device 102) to calculate the voltage drop value. (S14). Then, the DC power supply unit 101 compares the voltage drop value with a threshold value (S15), and if the voltage drop value is smaller than the threshold value, estimates the remaining usable power in the DC supply line Wdc (S16), The estimation result is displayed on the display unit 117 (S17). On the other hand, when the voltage drop value is equal to or greater than the threshold value, the DC power supply unit 101 stops supplying power to the DC device 102 connected to the farthest DC outlet 131 (S18), and returns to Step S13.

  As described above, according to the present embodiment, even when each DC device 102 is connected to the DC outlet 131 (the hook ceiling 132 is also the same), the DC outlet farthest from the DC power supply unit 101 as in the first embodiment. By using the voltage drop value of the DC device 102 connected to 131, the remaining usable power is estimated in the DC supply line Wdc, for example, the connection of the DC device 102 so as not to exceed the estimated usable power. Since it is possible to control or inform the user of the estimation result, it is possible to prevent the received voltage of each DC device 102 from becoming lower than the operating voltage necessary for the operation and shortening the life.

  Further, the DC power supply unit 101 manages the installation location of the DC outlet 131 in association with the outlet identification information, so that the DC outlet 131 farthest from the DC power supply unit 101, that is, the DC device farthest from the DC power supply unit 101. 102, the received voltage of all the DC devices 102 is received and the voltage drop value is not calculated for each DC device 102, but only the received voltage of the farthest DC device 102 is received and the voltage is received. What is necessary is just to calculate a fall value.

(Embodiment 6)
In the power distribution system of the sixth embodiment, the display 117 changes the connection order of the plurality of DC devices 102 on the DC supply line Wdc so as to reduce the difference in lifetime between the plurality of DC devices 102. It is different from the power distribution system of the second embodiment in that it is a connection order change notification means for performing notification. The plurality of DC devices 102 according to the present embodiment are configured such that the lifetime, which is a limit value of allowable usage time, varies depending on the received voltage.

  As described above, according to the present embodiment, by notifying the connection order of the plurality of DC devices 102 on the DC supply line Wdc, the user can connect the plurality of DC devices 102 on the DC supply line Wdc. Since the order can be changed, it is possible to prevent variations in life caused by the received voltage between the DC devices 102.

(Embodiment 7)
The power distribution system according to the seventh embodiment is different from the power distribution system according to the first embodiment in that the display device 117 is a connectable device notification unit that notifies the newly connectable DC device 102 according to the remaining usable power. is doing.

  As described above, according to the present embodiment, it is possible to prevent the DC device 102 from exceeding the remaining usable power from being connected.

(Embodiment 8)
In the power distribution system of the eighth embodiment, the control unit 32 of each DC device 102 has a function of cutting off the DC power supply to itself, and the control unit 42 of the DC power supply unit 101 exceeds the remaining usable power. When the direct current device 102 is newly connected, the control unit 32 of the direct current device 102 is controlled so that direct current power is not supplied to the newly connected direct current device 102, which is different from the power distribution system of the first embodiment. is doing.

  In the DC device 102 newly connected on the DC supply line Wdc, the control unit 32 transmits information on its own rated power to the DC power supply unit 101.

  On the other hand, in the DC power supply unit 101, when the control unit 42 receives information on the rated power from each newly connected DC device 102, whether or not the sum of these rated powers is less than or equal to the remaining usable power. Determine. When it is determined that the sum of the rated powers is less than or equal to the remaining usable power, the control unit 42 performs control so that DC power is also supplied to the newly connected DC device 102. On the other hand, when it is determined that the sum of the rated power exceeds the remaining usable power, the control unit 42 transmits a cutoff signal to the newly connected DC device 102.

  In the DC device 102 that has received the cutoff signal, the control unit 32 shuts off the DC power supply to itself so that it does not operate.

  As described above, according to the present embodiment, when DC power is supplied to all newly connected DC devices 102, the remaining usable power is exceeded, and DC power is supplied to the newly connected DC devices 102. Can be prevented.

  In the power distribution system of the fifth embodiment, the control unit 63 of the DC outlet 131 has the same function as the control unit 32 of the DC device 102 of the eighth embodiment, and the control unit 42 has the same function as that of the eighth embodiment. By having it, the DC power supply to the DC device 102 may be cut off when the DC outlet 131 receives the cutoff signal. Even with such a configuration, the same effect as the power distribution system of the eighth embodiment can be obtained. The same applies to the hook ceiling 132.

It is a block diagram of the power distribution system of Embodiments 1-8. It is the schematic of the power distribution system of Embodiment 1-4, 6-8. It is a block diagram which shows the structure of DC apparatus same as the above. It is a figure which shows the relationship between the receiving voltage and lifetime of a DC apparatus in a power distribution system same as the above. It is a block diagram which shows the structure of a direct-current power supply part same as the above. It is a flowchart which shows operation | movement of a power distribution system same as the above. It is an external view of the illumination load of Embodiment 2. It is a figure explaining operation | movement of a power distribution system same as the above. It is the schematic of the power distribution system of Embodiment 5. It is a block diagram which shows the structure of a DC outlet same as the above. It is a flowchart which shows operation | movement of a power distribution system same as the above.

Explanation of symbols

101 DC Power Supply Unit 102 DC Equipment Wdc DC Supply Line K102 Lighting System K104 House Alarm System

Claims (6)

A power distribution system comprising power supply means for supplying DC power to a plurality of electrical devices connected to one power supply line and each driven by DC power supply,
Detecting means for detecting a received voltage received by an electric device connected to a connection path distance farthest from the power supply means among the plurality of electric devices;
Calculating means for receiving the received voltage from the detecting means and subtracting the received received voltage from a set voltage of the power supply means to calculate a voltage drop value;
Control means for estimating remaining usable power in the power supply line using the voltage drop value calculated by the calculating means. The plurality of electrical devices are all the same,
The control means estimates the number of electrical devices that can be connected on the power supply line using the remaining usable power, and estimates the number of electrical devices that are driven simultaneously among the plurality of electrical devices. The power distribution system according to claim 1, wherein the combination of the electric devices that are driven simultaneously is changed so that the difference between the cumulative energization times of the plurality of electric devices is reduced. The plurality of electrical devices are all the same lighting load,
The power distribution system according to claim 2, wherein the cumulative energization time is a cumulative lighting time obtained by accumulating the lighting time of the lighting load. The plurality of electrical devices have a lifetime that is a limit value of an allowable use time, and changes depending on the received voltage,
Connection order change notification means for performing notification for changing the connection order of the plurality of electrical devices on the power supply line so as to reduce the difference in the lifetimes of the plurality of electrical devices. The power distribution system according to claim 2 or 3, characterized in that   5. The power distribution system according to claim 1, further comprising a connectable device notifying unit that notifies a newly connectable electrical device in accordance with the remaining usable power. For each electrical device connected on the power supply line, comprising a blocking means for blocking the DC power supply to the electrical device,
The control means controls the shut-off means so as to cut off the DC power supply to the newly connected electric device when the electric device is newly connected exceeding the remaining usable power. The power distribution system according to claim 1, wherein:

Images