JP2009178006A - Power supply system, and outlet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To connect multiple kinds of DC equipment requiring different voltages to a single DC supplying line. <P>SOLUTION: A DC power supply device 101 outputs a plurality of kinds of output voltages in time division manner. A DC outlet 131 is connected to the DC power supply device 101 through a DC supply line Wdc, and DC equipment 102 is detachably connected to the DC outlet 131. The DC outlet 131 includes a voltage detecting part 21 which detects an inter-line voltage of the DC supply line Wdc, a power reception decision part 22 which permits receiving of power during a period while a voltage detected with the voltage detecting part 21 is within a preset power reception voltage range, and an output control part 23 which outputs a DC power received from the DC supply line Wdc through an equipment connection port 131a during a period while the power reception decision part 22 permits receiving of power. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention mainly supplies DC power using a DC supply line to a plurality of DC devices having different required voltages when supplying power to DC devices arranged in a building such as a house, a store, or an office building. The present invention relates to an electric power supply system and an outlet used in the electric power supply system.

Conventionally, by connecting a DC power supply device that outputs DC power and a DC device driven by DC power via a DC supply line, the DC device can be used without using a power adapter that converts AC power into DC power. There has been proposed a technique for supplying power to the battery (see, for example, Patent Document 1). In the technique described in Patent Document 1, it is possible to optimize the flow of power by transmitting a signal indicating the start of operation before the start of power consumption by a DC device (electric device).
JP 2007-215258 A

  By the way, in Patent Document 1, it is possible to prevent an excessive current from flowing through the wiring. However, when there are a plurality of types of DC devices having different voltages necessary for driving, different DC supply lines are used. If a plurality of types of DC devices having different required voltages are mixed and used, a plurality of DC supply lines are required, resulting in a problem of complicated wiring.

  In order to solve this type of problem, it is conceivable that the voltage applied to the DC supply line is set to the highest voltage required for driving each DC device, and voltage conversion is performed to step down on the power receiving side. Since a loss accompanying voltage conversion is generated by a DC / DC converter or the like used for step-down, there is a problem that power use efficiency is lowered and power consumption is increased.

  The present invention has been made in view of the above-mentioned reasons, and an object of the present invention is to make it possible to connect a plurality of types of DC devices having different voltages required for driving to one DC supply line and to provide a voltage on the power receiving side. An object of the present invention is to provide a power supply system that eliminates the need for conversion and prevents loss associated with voltage conversion, and to provide an outlet used in the power supply system.

  The invention of claim 1 is a power supply system, which receives a DC power from a DC power supply device that outputs a plurality of types of output voltages in a time-sharing manner, and a DC power supply device via a DC supply line and a DC power. A power receiving device provided at an outlet that is detachably connected to a device connection port, the power receiving device detecting a line voltage of a DC supply line, and a voltage detecting unit The power reception determination unit that permits power reception during a period in which the voltage detected by the power reception device is within the power reception voltage range preset in the power reception device, and the DC that is received from the DC supply line during the period when the power reception determination unit permits power reception And an output control unit that outputs electric power from the device connection port.

  According to a second aspect of the present invention, in the first aspect of the invention, the output control unit stores the direct-current power received from the direct-current supply line and the stored direct-current power during the period when the power reception determination unit permits power reception. A power storage unit that outputs to the connection port is included.

  According to a third aspect of the invention, in the first or second aspect of the invention, the DC device includes an operating voltage notifying unit that notifies a power receiving device of a voltage value necessary for driving, and the power receiving determining unit is operated by the operating voltage notifying unit. A power reception voltage setting unit is provided that sets the power reception voltage range based on the notified voltage value.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the power reception determining unit is characterized in that a power reception voltage range is fixedly set.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the outlet includes a plurality of the device connection ports, and the power reception determination unit sets a power reception voltage range for each device connection port. It is characterized by that.

  The invention of claim 6 is an outlet which receives DC power via a DC supply line from a DC power supply device that outputs a plurality of types of output voltages in a time-sharing manner, and a DC device driven by DC power is attached or detached. It has a device connection port that can be connected, and a voltage detection unit that detects the line voltage of the DC supply line, and receives power during a period in which the voltage detected by the voltage detection unit is within a preset reception voltage range. A power reception determination unit to permit, and an output control unit that outputs DC power received from the DC supply line from a device connection port during a period when the power reception determination unit permits power reception.

  According to the first and sixth aspects of the invention, the DC power supply device applies a plurality of types of output voltages to the DC supply line in a time-sharing manner, and the line voltage of the DC supply line at the outlet is within the received voltage range. Because it receives power and outputs it from the device connection port, multiple types of DC devices with different voltages required for driving can be connected to one DC supply line by applying multiple types of DC voltage to the DC supply line at different timings. It becomes possible to do. In addition, since it is determined whether or not the line voltage of the DC supply line is within the power receiving voltage range at the outlet, the DC power supply apparatus can perform an appropriate timing without communicating between the DC power supply apparatus and the outlet. Thus, the output voltage can be switched, and the configuration of the DC power supply device is simplified. In addition, the DC power supply apparatus applies the output voltage required by the DC device to the DC supply line, and after receiving power from the DC supply line until the DC power is supplied to the DC device, the DC / DC conversion circuit. The voltage conversion by is unnecessary, and there is no loss associated with the voltage conversion, resulting in high efficiency.

  According to the configuration of the invention of claim 2, when a plurality of types of output voltages are applied in a time-sharing manner from the DC power supply device, power cannot be continuously received from the DC supply line during the operation period of the DC device. Even so, since the output control unit provided in the outlet includes the power storage unit, power can be continuously supplied to the DC device.

  According to the configuration of the invention of claim 3, since the receiving voltage range can be set flexibly according to the voltage value required by the DC device connected to the outlet, various DCs with different voltages required for driving can be set. The device can be used by connecting it to an outlet.

  According to the configuration of the invention of claim 4, since the power reception voltage range is fixedly set for each outlet, a DC device can be connected to the outlet according to a voltage required for driving. Can be used exclusively.

  According to the configuration of the invention of claim 5, since a plurality of device connection ports are provided in the outlet and the receiving voltage range is set for each device connection port, a plurality of DC devices that operate in association with each other. It becomes possible to collectively supply power to one place. Here, when the voltages necessary for driving a plurality of DC devices connected to the outlet are equal, the received voltage range may be set equal, and when different, the received voltage range may be set differently.

(Basic configuration)
Although the embodiment described below is described assuming a detached house as a building to which the present invention is applied, it does not preclude applying the technical idea of the present invention to an apartment house. FIG. 4 shows the overall configuration of a power supply system to which this embodiment is applied. As shown in FIG. 4, the house H is provided with a DC power supply device 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 device 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 device 101 and the DC device 102. When an abnormality is detected, power is supplied from the DC power supply device 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.

  DC supply line Wdc is connected to home server 116 via DC power supply apparatus 101. The in-home server 116 is a main device for constructing a home communication network (hereinafter referred to as “home network”), and communicates with a subsystem 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, an intercom system K103 including a DC device 102 for handling visitors and monitoring intruders, a residential alarm system K104 including a DC device 102 for an alarm system such as a fire detector, and the like. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The above-described DC breaker 114 is provided in association with a subsystem. In the illustrated example, four DCs are associated with the information equipment system K101, the lighting system K102 and the 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 “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, the DC power supply apparatus 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 device 101 is provided with a secondary battery 162 in preparation for a period during which no power is 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 cooperation control unit 113 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 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 device 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 depending on the device, the cooperative control unit 113 is provided with a DC / DC converter to convert the DC voltage obtained from the main power source and the distributed power source into the necessary voltage. Is desirable. Normally, one type of voltage is supplied to one subsystem (or 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 a communication function, 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 device 101 can be provided for each floor or room of the house H, the DC power supply device 101 can be managed for each system, and the DC device 102 that uses DC power Since the distance of the DC supply line Wdc between the two is reduced, the power loss due to the voltage drop in the DC supply line Wdc can be reduced. Also, the main breaker 111 and the branch breaker are housed in the distribution board 110, and the AC / DC converter 112, the cooperative control unit 113, the DC breaker 114, and the home server 116 are housed in a separate board from the distribution board 110. Also good.

(Embodiment 1)
Below, the principal part of this embodiment is demonstrated with reference to FIG. The DC power supply apparatus 101 includes a power supply circuit unit 10 including a DC / DC converter in the cooperative control unit 113. The power supply circuit unit 10 adjusts the voltage of DC power obtained from the AC / DC converter 112, the solar cell 161, the secondary battery 162, and the fuel cell 163, and applies the voltage between the DC supply lines Wdc.

  The power supply circuit unit 10 outputs a plurality of types of output voltages in a time-sharing manner. Specifically, the output voltage of the power supply circuit unit 10 is adjusted by performing PWM control for controlling the on-duty of the switching element provided in the DC / DC converter constituting the power supply circuit unit 10. The power supply circuit unit 10 may include a plurality of power supply circuits having different output voltages and a selection switch that selectively selects a power supply circuit connected to the DC supply line Wdc. However, when the latter configuration is adopted, it is desirable to stop the operation of the power supply circuit that is not selected by the selection switch. In addition, when the latter configuration is adopted, the output voltage changes in a plurality of stages. However, if the former configuration is adopted, the output voltage of the power supply circuit unit 10 can be selected from a plurality of types and the output voltage can be finely adjusted. Is possible.

  The output voltage of the power supply circuit unit 10 is controlled by the voltage control unit 11 so as to have a predetermined change pattern as shown in FIG. 2A or 3A.

  In the change pattern shown in FIG. 2 (a), a plurality of types of voltages (three types A, B, and C in the illustrated example) are output for a predetermined power supply period, and the power supply time for each voltage is set appropriately. Has been. The feeding period of each voltage is set in advance according to the power required in the DC device 102 to which DC power is supplied from the DC supply line Wdc. The power supply circuit unit 10 repeatedly outputs each voltage so that the time required to output all the voltages for each power supply period is one cycle, and the voltage gradually changes from a high voltage to a low voltage in one cycle. is doing.

  In the change pattern shown in FIG. 3 (a), voltages in a plurality of stages (in the illustrated example, five stages (1) to (5)) are sequentially output for each fixed power supply period, and the change pattern is stepped. Yes. The power supply circuit unit 10 outputs all voltages in order from the high voltage side for each fixed power feeding period, and provides a pause period during which no voltage is output for the same time as the power feeding period, and the time required to output all voltages, The period including the rest period is one cycle. In the change pattern of FIG. 2A, there is a pause period in which no voltage is applied to the DC supply line Wdc while switching the voltage within one cycle. However, in the change pattern of FIG. No pause is provided between the voltage changes.

  In the change pattern shown in FIG. 3A, since the output voltage of the DC power supply apparatus 101 is sequentially reduced with time, the difference between adjacent voltages in the time axis direction is relatively small. Therefore, ringing (voltage oscillation) accompanying voltage change hardly occurs. In order to further reduce the occurrence of ringing, it is desirable to adopt a change pattern in which the voltage is gradually increased and then gradually decreased so that a voltage change with a large voltage difference does not occur.

  As described above, the output voltage of the power supply circuit unit 10 changes with time, and there is provided one DC supply line Wdc of two lines or three lines to which the output voltage of the power supply circuit unit 10 is applied. By selecting the output voltage of the power supply circuit unit 10, the line voltage of the DC supply line Wdc changes. Here, when the DC supply line Wdc is a two-wire type as shown in the figure, if one is set to a reference potential (0 V) and the other is applied with a voltage that is higher or lower than the reference potential. When the DC supply line Wdc is of a three-wire type, one is set to the reference potential (0 V), a voltage that is higher than the reference potential is applied to one of the remaining lines, and the reference potential is applied to the other. A voltage having a low potential is applied.

  A DC device 102 is connected to the DC supply line Wdc via a DC outlet (outlet). In FIG. 1, a DC outlet 131 is shown as a DC outlet for connecting the DC device 102, but a hook ceiling 132 can also be used as a DC outlet. The body of the DC outlet 131 includes a device connection port 131a to which a plug such as a plug provided in the DC device 102 or a hooking blade provided in the DC device 102 is detachably connected, and a DC connection to the DC supply line Wdc. A power connection terminal 131b for connecting the outlet 131 is provided. The device connection port 131a preferably has a structure in which a connector is inserted and connected.

  As described above, since the line voltage of the DC supply line Wdc changes with time, a period during which the line voltage of the DC supply line Wdc is a voltage necessary for driving the DC device 102 in the DC outlet 131. Receive power. That is, a power receiving device 103 that controls a period for receiving power from the DC supply line Wdc is provided in the DC outlet 131.

  The power receiving apparatus 103 receives DC power from the DC supply line Wdc through the wire connection port 131b during a period in which the line voltage of the DC supply line Wdc is a voltage necessary for driving the DC device 102 connected to the device connection port 131a. To do. In order to determine whether or not the line voltage of the DC supply line Wdc is a voltage necessary for driving the DC device 102 connected to the device connection port 131a, the power receiving device 103 is applied to the wire connection port 131b. A voltage detection unit 21 that detects the line voltage of the DC supply line Wdc that is present, and power reception that permits power reception during a period in which the voltage detected by the voltage detection unit 21 is within a power reception voltage range preset in the power reception device 103 And a determination unit 22.

  The power reception determination unit 22 is provided with a voltage setting unit 22 a in which a voltage necessary for driving the DC device 102 is set. For the voltage setting unit 22a, a dip switch or a rewritable nonvolatile semiconductor memory is used. In the power reception determination unit 22, the allowable range that can be supplied to the DC device 102 with respect to the voltage set in the power reception setting unit 22a is set as the power reception voltage range, and whether the voltage detected by the voltage detection unit 21 is within the power reception voltage range. Judge whether or not.

  Between the device connection port 131a and the wire connection port 131b of the DC outlet 131, an output control unit 23 having a switch element (preferably using an electromagnetic relay or a semiconductor relay) SW for opening and closing an electric circuit is provided. The output control unit 23 turns on the switch element SW when the line voltage of the DC supply line Wdc detected by the voltage detection unit 21 is within the power reception voltage range set in the power reception determination unit 22, and the power reception voltage range When it is outside, the switch element SW is turned off.

  By the way, when the line voltage of the DC supply line Wdc is changed in the change pattern of FIG. 2A, if the power receiving voltage range is set so as to receive the voltage B in the power receiving device 103, the switch element The voltage on the device connection port 131a side in SW is as shown in FIG. In addition, when the line voltage of the DC supply line Wdc is changed in the change pattern of FIG. 3A, the power receiving voltage range is set so that the power receiving device 103 receives the voltage (3). The voltage on the device connection port 131a side in the switch element SW is as shown in FIG. Thus, in any case, power is intermittently received.

  When the DC device 102 allows intermittent power supply, the switch element SW may be directly connected to the device connection port 131a. However, when the DC device 102 needs to supply power continuously, the switch element SW It is desirable to provide the power storage unit 24 between the device connection port 131a. The power storage unit 24 includes a secondary battery or a capacitor. The power storage unit 24 stores the DC power that is stored and stored during the period when the power reception determination unit 22 permits power reception (that is, the period during which the switch element SW is on). Can be output to the DC device 102. Therefore, although the power is intermittently received from the DC supply line Wdc, it is possible to continuously supply power to the DC device 102 by providing the power storage unit 24. When a large secondary battery is used to increase the capacity stored in the power storage unit 24, the power storage unit 24 can be provided outside the container of the DC outlet 131.

  Since the amount of DC power stored in the power storage unit 22 is determined by the amount of power received by the power reception control unit 21 from the DC supply line Wdc, the amount of power received by the power reception control unit 21 is necessary for driving the DC device 102. It depends on the amount of power. Further, the output voltage of power storage unit 22 is the same voltage as the voltage received from DC supply line Wdc.

  Either the period during which the DC device 102 is driven or the case where the DC device 102 is always operated may be selected as the period for storing power in the power storage unit 22. When the power consumption of the DC device 102 is low, the former configuration is used to save power, and when the power consumption of the DC device 102 is high, the latter configuration is used to prevent direct current without causing power shortage. It is possible to supply power to the device 102.

  In addition, when the change of the voltage taken out from the apparatus connection port 131a is not required after the installation of the DC outlet 131, or when the DC outlet 131 is used exclusively for the specific DC apparatus 102, the voltage by the voltage setting unit 22a is fixed. Therefore, a dip switch or a semiconductor memory may be set at the time of construction or when the DC device 102 is connected. Alternatively, the voltage may be fixed so that the voltage cannot be changed by the voltage setting unit 22a. In this case, it is sufficient to prepare a plurality of types of specifications with different voltages to be taken out from the device connection portion 131a as the DC outlet 131.

  As described above, the DC power supply apparatus 101 applies a plurality of types of output voltages to the DC supply line Wdc in a time-sharing manner, and the DC outlet 131 receives power if the line voltage of the DC supply line Wdc is within the received voltage range. Thus, since the output is made from the device connection port 131a, it is possible to supply power to a plurality of types of DC devices 102 having different voltages required for driving by only two DC supply lines Wdc. Moreover, since the DC power supply apparatus 101 applies the output voltage required by the DC device 102 to the DC supply line Wdc, it is not necessary to perform voltage conversion at the DC outlet 131, and power is supplied with high efficiency with little loss. Can do. Further, since it is determined whether or not the line voltage of the DC supply line Wdc is within the received voltage range at the DC outlet 131, there is no need to communicate between the DC power supply apparatus 101 and the DC outlet 131, and the DC power The configuration of the supply device 101 is simplified.

(Embodiment 2)
In the first embodiment, the voltage setting in the power reception voltage setting unit 22a provided in the power reception determination unit 22 is manually performed by operating a dip switch or writing to the semiconductor memory. However, in the present embodiment, the DC outlet 131 is used. The voltage of the power reception voltage setting unit 22a is automatically set according to the DC device 102 connected to. That is, the voltage required for driving the DC device 102 is automatically acquired at the DC outlet 131, and the power reception voltage range of the power reception determination unit 22 is automatically set.

  In order to enable this operation, as shown in FIG. 5, the DC device 102 is provided with an operating voltage notification unit 25 for notifying the DC outlet 131 (the power receiving device 103) of the voltage required for driving, and the DC outlet 131 ( The power receiving apparatus 103) is provided with an operating voltage acquisition unit 26 that acquires the voltage value notified by the operating voltage notification unit 25. The received voltage setting unit 22 a of the received power determination unit 22 stores the voltage value acquired by the operating voltage acquisition unit 26. Therefore, a rewritable nonvolatile semiconductor memory is used for the power reception voltage setting unit 22a of the present embodiment.

  The operating voltage notification unit 25 and the operating voltage acquisition unit 26 can adopt a configuration that realizes notification of a voltage value by a communication function. For communication between the operating voltage notification unit 25 and the operating voltage acquisition unit 26, a high-frequency communication signal transmitted by being superimposed on a DC voltage supplied to the DC device 102 through a connection line connected to the device connection port 131a. Can be used. In this case, since a communication line is unnecessary in addition to a connection line that supplies DC power while performing wired communication, the connection work of the DC device 102 to the DC outlet 131 does not increase.

  It is also possible to use a wireless transmission path for communication. For example, an infrared light emitting element is provided in the received voltage notification unit 25, an infrared light receiving element is provided in the operating voltage acquisition unit 26, and a communication path using infrared as a medium from the received voltage notification unit 25 to the operating voltage acquisition unit 26 And a voltage necessary for driving the DC device 102 may be notified.

  Alternatively, an optically readable medium in which a voltage is expressed using a one-dimensional barcode or a two-dimensional barcode is provided as the received voltage notification unit 25, and an image sensor such as a CCD image sensor is provided in the operating voltage acquisition unit 26. It may be used to read information recorded on the medium.

  Other configurations and operations of the present embodiment are the same as those of the first embodiment. In the present embodiment, the power reception by the power reception determination unit 22 is based on the voltage notified from the DC device 102 connected to the device connection port 131a. Since the voltage range is determined, the receiving voltage range can be flexibly set according to the DC device 102. In addition, when the DC device 102 connected to the DC outlet 131 is changed, the receiving voltage range is automatically set by meeting the DC device 102, so that the user can set the voltage necessary for driving the DC device 102. It is possible to provide the DC outlet 131 that can be connected to the DC outlet 131 without being aware of it and is easy to use. Although the power storage unit 24 is omitted in FIG. 5, the power storage unit 24 can be provided as necessary.

(Embodiment 3)
In the above-described embodiment, an example in which the DC outlet 131 includes one device connection port 131a has been described. However, as illustrated in FIG. 6, a plurality of (three in the illustrated example) device connection ports 131a are provided in the DC outlet 131. May be provided. Switch elements SW1, SW2, and SW3 are inserted between the device connection ports 131a and the wire connection ports 131b, respectively. The power reception determination unit 22 can individually set a power reception voltage range in which each switch element SW1, SW2, SW3 is turned on, and each of the open / close signals S1, S2, S3 output from the power reception determination unit 22 Opening and closing of the switch elements SW1, SW2 and SW3 are individually controlled.

  Accordingly, a plurality of DC devices 102 can be connected to one DC outlet 131, and power can be supplied collectively from one DC outlet 131 even when the voltages required for driving each DC device 102 are different. it can. For example, when a plurality of DC devices 102 used in association with each other are arranged in one place (for example, a broadband modem, a telephone adapter, and a wireless router using an optical cable are collected in one place. In the case of arrangement, power can be supplied from one DC outlet 131 even if the voltage required for driving each DC device 102 is different. Of course, when the voltages necessary for driving each DC device 102 are equal, the receiving voltage ranges corresponding to the device connection ports 131a may be set to be the same.

  Other configurations and operations of the present embodiment are the same as those of the first or second embodiment, and the power storage unit 24 described in the first embodiment can be provided in association with each device connection port 131a as necessary. In addition, it is possible to provide the operating voltage notification unit 24 and the operating voltage acquisition unit 25 described in the second embodiment.

FIG. 3 is a principal block diagram showing Embodiment 1. It is operation | movement explanatory drawing which shows the operation example same as the above. It is operation | movement explanatory drawing which shows the other operation example same as the above. It is a block diagram which shows the whole structure same as the above. It is a block diagram which shows the DC outlet used for Embodiment 2. It is a block diagram which shows the DC outlet used for Embodiment 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power supply circuit part 11 Voltage control part 21 Voltage detection part 22 Power reception judgment part 22a Power reception voltage setting part 23 Output control part 24 Power storage part 25 Operation voltage notification part 26 Operation voltage acquisition part 101 DC power supply apparatus 102 DC apparatus 103 Power reception apparatus 131 DC outlet (Outlet)
131a Device connection port 131b Wire connection port 132 Catch ceiling (Outlet)
H House (Building)
Wdc DC supply line

Claims (6)

  DC power supply device that outputs multiple types of output voltage in a time-sharing manner and DC power received from the DC power supply device via the DC supply line, and DC equipment driven by DC power can be attached to and detached from the equipment connection port A power receiving device provided at a connected outlet, the power receiving device detecting a line voltage of the DC supply line, and a voltage detected by the voltage detecting unit is preset in the power receiving device A power reception determination unit that permits power reception during a period within the power reception voltage range; and an output control unit that outputs DC power received from the DC supply line from the device connection port during a period when the power reception determination unit permits power reception. A power supply system characterized by that.   The output control unit includes a power storage unit that stores DC power received from the DC supply line and outputs the stored DC power to a device connection port while the power reception determination unit permits power reception. The power supply system according to claim 1.   The DC device includes an operating voltage notifying unit that notifies a power receiving device of a voltage value necessary for driving, and the power receiving determining unit sets the receiving voltage range based on the voltage value notified by the operating voltage notifying unit. The power supply system according to claim 1, further comprising a unit.   The power supply system according to claim 1 or 2, wherein the power reception determination unit has a power reception voltage range fixedly set.   5. The power according to claim 1, wherein the outlet includes a plurality of the device connection ports, and the power reception determination unit has a power reception voltage range set for each device connection port. Supply system.   A DC power supply device that outputs a plurality of types of output voltage in a time-sharing manner receives DC power via a DC supply line, and has a device connection port to which a DC device driven by DC power is detachably connected, The voltage detection unit that detects the line voltage of the supply line, the power reception determination unit that permits power reception during a period in which the voltage detected by the voltage detection unit is within a preset power reception voltage range, and the power reception determination unit And an output control unit that outputs DC power received from a DC supply line from a device connection port during a period during which power is permitted.

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