JP5192833B2 - Power supply system, DC power supply device - Google Patents

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 a power supply system and a DC power supply device used in the 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 does not require conversion and prevents loss associated with voltage conversion, and further provides a direct-current power supply device used in the power supply system.

The invention of claim 1 includes a DC power supply device that supplies DC power, a plurality of power receiving devices that receive DC power from the DC power supply device via a DC supply line, and a DC power that each power receiving device receives. The DC power supply device includes a power supply circuit unit capable of selecting a plurality of types of output voltage, a voltage control unit for selecting an output voltage of the power supply circuit unit, and a power receiving device. A power supply side communication unit that performs communication, a timing signal generation unit that generates a power reception timing signal that specifies a timing for receiving power to the power receiving device, and sends the power reception timing signal to the DC supply line as a communication signal to the power reception device through the power supply side communication unit; Therefore, the output voltage of the power supply circuit section is voltage-controlled so that each power receiving device can receive the DC voltage required for driving the DC device at the timing specified by the power reception timing signal. A power receiving device that communicates with the DC power supply device, and a DC supply line at a timing indicated by a power reception timing signal received through the power receiving side communication unit. A power reception control unit that receives DC power from the power storage unit, and a power storage unit that stores the DC power received by the power reception control unit and supplies the stored DC power to a DC device.

  According to a second aspect of the present invention, in the first aspect of the invention, the overall control unit causes the voltage control unit to receive the DC voltage necessary for driving the DC device for each power receiving device. Instructing the output voltage, and before the power supply circuit unit outputs the output voltage for each power reception device, the power supply circuit unit causes the timing signal generation unit to transmit a power reception timing signal including identification information of the power reception device, and The control unit receives DC power from the DC supply line in a specified period after the power receiving side communication unit receives a power receiving timing signal including identification information of the power receiving device.

  According to a third aspect of the present invention, in the first aspect of the present invention, the overall control unit instructs the voltage control unit of the output voltage of the power supply circuit unit with a change pattern of a constant cycle in which power reception periods are arranged at predetermined time intervals. In addition, the timing signal generation unit transmits a power reception timing signal as a synchronization signal for each period of the change pattern, and the power reception control unit changes the change after the power reception side communication unit receives the power reception timing signal as a synchronization signal. DC power is received from the DC supply line during a known specified period of the pattern.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the overall control unit supplies the output voltage of the power supply circuit unit to the voltage control unit with a predetermined change pattern defined by a combination of power reception periods of a certain time. Instructing and transmitting the power reception timing signal including the order information of the power reception device that receives power for each change pattern to the timing signal generation unit, and the power reception control unit receives power after the power reception side communication unit receives the power reception timing signal. DC power is received from the DC supply line in a specified period according to the order information included in the timing signal.

  According to a fifth aspect of the invention, in the third or fourth aspect of the invention, the power receiving device is allowed to receive power a plurality of times from the DC supply line in the change pattern.

  According to a sixth aspect of the present invention, in the first aspect of the invention, the overall control unit instructs the output voltage of the power supply circuit unit to the voltage control unit with a predetermined change pattern defined by a combination of variable power reception periods. And a power reception timing signal including time information of a power reception device that receives power for each change pattern is transmitted to the timing signal generation unit, and the power reception control unit receives the power reception timing after the power reception side communication unit receives the power reception timing signal. DC power is received from the DC supply line in a specified period according to time information included in the signal.

  According to a seventh aspect of the present invention, in the invention according to any one of the fourth to sixth aspects, the overall control unit determines the change pattern in response to a request for power supply from the power receiving apparatus.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the power receiving device is provided at an outlet connected to the DC supply line and detachably connected to the DC device. And

  According to a ninth aspect of the present invention, in any one of the first to seventh aspects, the power receiving device is provided in the DC device.

The invention according to claim 10 is a DC power supply device, wherein the output voltage applied to the DC supply line can be selected from a plurality of types, and the power supply circuit unit that receives DC power in the power receiving device connected to the DC supply line And a voltage control unit that selects an output voltage of the power supply circuit unit, a power supply side communication unit that communicates with the power reception device, and a power reception timing signal that specifies a timing for the power reception device to receive power through the power supply side communication unit A timing signal generator that sends a power reception timing signal to the DC supply line as a communication signal to the power reception device, and a power supply so that the power reception device can receive a DC voltage required for driving the DC device at a timing specified by the power reception timing signal. And an overall control unit that instructs the output voltage of the circuit unit to the voltage control unit.

  According to the configuration of the first aspect of the invention, the direct-current power supply device selects the output voltage from a plurality of types, specifies the timing for receiving power by the power receiving device with the power receiving timing signal, and the power receiving device specifies with the power receiving timing signal. DC power is received from the DC supply line at the same timing, and the received DC power is stored in the power storage unit and supplied to the DC device, so that it can be driven by applying multiple types of DC voltage to the DC supply line at different timings. It is possible to connect a plurality of types of DC devices having different voltages required for one DC supply line. In addition, since the power reception timing is specified by the power reception timing signal, the DC power supply device needs to output only the DC power required by the DC device, and does not wastefully supply power, thus saving energy. Moreover, since the DC power supply device applies the output voltage required by the DC device to the DC supply line, the DC power supply device receives DC power from the DC supply line and then supplies DC power to the DC device. The voltage conversion by the DC conversion circuit is unnecessary, and the loss associated with the voltage conversion does not occur and the efficiency is high.

  According to the configuration of the second aspect of the invention, when the DC power supply device outputs the output voltage for each power receiving device, the power receiving timing signal including the identification information designating the power receiving device to be received is transmitted. DC power can be supplied by individually specifying a power receiving device that receives power from the DC supply line, and the power receiving device can receive DC power at an accurate timing using a power reception timing signal as a reference.

  According to the configuration of the invention of claim 3, in the DC power supply device, the output voltage is selected by a constant time with a change pattern of a constant cycle, and the power reception timing signal is transmitted for each cycle of the change pattern. With the power reception timing signal as a reference timing, it is possible to know a period during which a voltage to be received by the power receiving device can be obtained in a known change pattern, so that DC power can be received at an accurate timing. Further, as compared with the case where the power receiving timing signal is given to each power receiving device as in the configuration of claim 2, the number of times of transmitting the power receiving timing signal is small, so the ratio of time available for power supply per unit time is increased. be able to.

  According to the configuration of the invention of claim 4, in the DC power supply device, the output voltage is selected with a change pattern defined by the combination of the power reception periods for each fixed time, and the order information of the power reception device that receives power for each change pattern is the power reception timing. The power receiving device receives the DC power from the DC supply line during the specified period specified by the order information of the received power reception timing signal, so the change pattern is changed every time the power reception timing signal is generated. It is possible to supply power flexibly according to the DC device to be operated. In addition, as in the third aspect of the invention, compared to the configuration of the second aspect, since the number of times of receiving the power reception timing signal is small, the proportion of time available for power supply per unit time can be increased.

  According to the configuration of the fifth aspect of the invention, power reception is allowed multiple times from the DC supply line in the change pattern, so that it is possible to vary the number of times each power receiving device receives power, and the power reception period is constant. For each DC device with high power consumption, the necessary power can be ensured by performing power reception a plurality of times within one change pattern, while taking time.

  According to the configuration of the invention of claim 6, the power reception period in which the power reception apparatus receives power once in the DC power supply apparatus is a variable time, and the change pattern is defined by the combination of the power reception periods. Since each power receiving device includes time information that specifies the period during which power is received, and the power receiving device receives power during the specified period specified by the time information, the change pattern can be changed each time a power receiving timing signal is generated. Flexible power supply is possible depending on the DC device to be operated. That is, by supplying power to a DC device with large power consumption for a long time, it is possible to supply power to the DC device without excess or deficiency.

  According to the configuration of the seventh aspect of the invention, since power is supplied from the DC power supply device in response to a request from the power receiving device, power is supplied from the power supply device only to the power receiving device that requires power reception. Further energy saving is promoted.

  According to the configuration of the eighth aspect of the invention, since the power receiving device is provided at the outlet, even a DC device having no communication function can receive power from a DC supply line to which a plurality of types of voltages are applied. Become.

  According to the configuration of the ninth aspect of the invention, since the power receiving device is provided in the DC device, it is possible to receive power from the DC supply line to which a plurality of types of voltages are applied only by connecting the DC device to the DC supply line. It becomes possible.

  According to the configuration of the tenth aspect of the present invention, since a plurality of types of output voltages can be selected and the timing at which the power receiving device receives power is specified by the power receiving timing signal, the line voltage of the DC supply line in the power receiving device is Power can be received based on the power reception timing signal when the required voltage is reached. That is, even when a plurality of power receiving devices having different voltages to be received are connected to one DC supply line, it is possible to supply DC power with a voltage suitable for each power receiving device.

(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 and K105, an intercom system K103 including a DC device 102 that handles visitor correspondence and intruder monitoring, and a residential alarm system K104 including a warning 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 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 about equipment in the home network ( Here, it is assumed that an IP address is used).

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

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

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

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

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

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

  By the way, the DC power supply 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 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 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, a DC / DC converter is provided in the cooperative control unit 113 to convert the DC voltage obtained from the main power source and the distributed power source into a 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)
Below, the principal part of this embodiment is demonstrated with reference to FIG. In FIG. 1, a solid line indicates a power supply path, and a broken line indicates a communication path. As described above, the communication signal is superimposed on the DC voltage, but a communication path for transmitting the communication signal may be provided separately from the DC supply line Wdc. 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 output voltage of the power supply circuit unit 10 can be selected from a plurality of types. 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 voltage control unit 11 selects an output voltage of the power supply circuit unit 10. The voltage control unit 11 selects an output voltage of the power supply circuit unit 10 in response to an instruction from the overall control unit 12. The overall control unit 12 instructs the timing signal generation unit 13 to generate a power reception timing signal, and also instructs the voltage control unit 11 to output the power supply circuit unit 10. The power reception timing signal generated by the timing signal generation unit 13 is sent to the DC supply line Wdc as a communication signal to the power reception device 103 through the power supply side communication unit 14. The power supply circuit unit 10, the voltage control unit 11, the general control unit 12, the timing signal generation unit 13, and the power feeding side communication unit 14 are provided in the DC power supply apparatus 101.

  As described above, the output voltage of the power supply circuit unit 10 can be selected from a plurality of types, and the output voltage is applied to one DC supply line Wdc of two-wire type or three-wire type. Is selected, the line voltage of the DC supply line Wdc changes.

  The DC device 102 is directly connected to the DC supply line Wdc (see FIG. 2) or is connected to the DC device 102 via a DC outlet (outlet). Although FIG. 1 shows an example in which the DC device 102 is connected to a DC outlet 131 as a DC outlet, the hook ceiling 132 can also be used as a DC outlet. In the configuration example shown in FIG. 1, the DC outlet 131 incorporates the power receiving device 103, and in the configuration example shown in FIG. Built in.

  The power receiving device 103 includes a power reception control unit 21 that selects whether or not to receive DC power from the DC supply line Wdc, a power storage unit 22 that stores the DC power received by the power reception control unit 21, and the DC power supply device 101. The power supply side communication part 14 provided and the power receiving side communication part 23 which communicates through DC supply line Wdc are provided. Identification information necessary for communication is set in the power reception side communication unit 23 and the power supply side communication unit 14. The power reception control unit 21 receives DC power from the DC supply line Wdc at a timing indicated by the reception timing signal received from the timing signal generation unit 13 through the power supply side communication unit 14 and the power reception side communication unit 23. The power storage unit 22 includes, for example, a secondary battery, and stores the DC power received by the power reception control unit 21.

  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.

  The power receiving side communication unit 23 is configured to transmit and receive a communication signal to and from the power supply side communication unit 14 by superimposing a high frequency communication signal on a DC voltage applied between the DC supply lines Wdc. It is not necessary to provide a connection dedicated for communication at the connection terminal 131b, and the connection work between the DC outlet 131 and the DC supply line Wdc is easy and the construction is facilitated. The same applies to the case where the DC device 102 ′ including the power receiving device 103 is connected to the DC supply line Wdc.

  The power storage unit 22 supplies the stored DC power to the DC device 102 connected to the device connection unit 131a. 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.

  Therefore, the voltage applied between the lines of the DC supply line Wdc by the power supply circuit unit 10 is set to a voltage necessary for operating the DC device 102 (or the main function unit 102a of the DC device 102 ′). In 103, power can be supplied to the DC device 102 (or the main function unit 102a of the DC device 102 ') without performing voltage conversion. Hereinafter, the DC device 102 and the main function unit 102a of the DC device 102 ′ will be described as the DC device 102 without distinguishing them.

  Next, a technique for controlling the timing at which the power reception control unit 21 receives power from the DC supply line Wdc will be described. In the example described below, a case where three power receiving devices 103 are connected to the DC supply line Wdc is used as an example, and the signs of A, B, and C are used to distinguish each power receiving device 103. Each power receiving device 103 needs to receive power in accordance with the amount of power and voltage required to operate the DC device 102. The voltage is determined by the output voltage of the power supply circuit unit 10, and the received voltage is constant. If there is, the amount of power is determined by the time when the power receiving apparatus 103 receives power.

  First, the case where each power receiving apparatus 103 receives DC power having a different voltage will be described. In this example, the amount of power is not particularly considered, and the amount of power necessary to operate the DC device 102 can be secured by the following operation, and the amount of power stored in the power storage unit 22 is also used to operate the DC device 102. The required amount can be secured. In order for each power receiving device 103 to receive DC power in response to the selection of the output voltage of the power supply circuit unit 10, it is necessary to instruct each power receiving device 103 from the DC power supply device 101 to the timing of power reception. Therefore, a method of designating the power receiving device 103 every time the output voltage of the power supply circuit unit 10 is changed can be adopted.

  That is, as illustrated in FIG. 3A, after transmitting the power reception timing signal TM including the identification information ID set in the power reception communication unit 23 of each power reception device 103 from the DC power supply device 101, A voltage to be received is applied to the DC supply line Wdc. In the illustrated example, the power reception timing signal TM including the identification information ID of the power reception apparatus 103 is generated every certain time T1. That is, when applying a voltage to be received by each of the power receiving devices A, B, and C to the DC supply line Wdc, the power receiving circuit includes identification information designating each of the power receiving devices A, B, and C before applying the voltage by the power supply circuit unit 10. The timing signal TM is transmitted.

  The above-described control is performed at the initiative of the overall control unit 12 in the DC power supply apparatus 101. That is, the overall control unit 12 instructs the voltage control unit 11 on the output voltage of the power supply circuit unit 10, and before the power supply circuit unit 10 outputs the output voltage for each of the power receiving devices A, B, and C, 13 is caused to transmit a power reception timing signal including identification information of the power receiving apparatuses A, B, and C.

  Through such an operation, each of the power receiving devices A, B, and C determines whether or not the power receiving timing signal includes the identification information ID that designates itself, and receives the power receiving timing signal that designates itself. In 103, it becomes possible to receive DC power from the DC supply line Wdc in a specified period which is a fixed time after the power reception timing signal. That is, it is possible to receive DC power of different voltages applied to the DC supply line Wdc for each of the power receiving devices A, B, and C separately by each of the power receiving devices A, B, and C.

  In the operation example of FIG. 3A, the DC power supply apparatus 101 individually generates a power reception timing signal for specifying a power receiving destination for each of the power receiving apparatuses A, B, and C. 3 is fixed and the order of receiving power is also fixed, the change pattern for changing the output voltage of the power supply circuit unit 10 over time is constant, so that the synchronization signal SY is obtained as shown in FIG. A technique of changing the output voltage of the power supply circuit unit 10 with a specified change pattern after transmitting the power reception timing signal TM can be employed.

  That is, in the overall control unit 12 of the DC power supply apparatus 101, after instructing the timing signal generation unit 13 to generate a power reception timing signal that becomes the synchronization signal SY, a change in a constant cycle T2 in which power reception periods Tu are arranged at regular intervals. The voltage control unit 11 is instructed by the pattern of the output voltage of the power supply circuit unit 10. With this operation, as shown in FIG. 3B, the line voltage of the DC supply line Wdc can be changed with a change pattern in which the power reception periods Tu are arranged in order after the power reception timing signal TM.

  In the power reception control unit 21 of the power reception devices A, B, and C, when the power reception side communication unit 23 receives the power reception timing signal TM that is a synchronization signal, a specified period (power reception period) that is a timing at which the power reception device itself receives power in the above change pattern. In Tu), DC power is received from the DC supply line Wdc.

  When the technique shown in FIG. 3B is adopted, each of the power receiving apparatuses A, B, and C needs to manage the power receiving period Tu in which the power receiving apparatus A, B, and C itself receives the identification information ID of the power receiving apparatuses A, B, and C. As compared with the case of employing the technique of FIG. 3A that transmits the power reception timing signal TM including each time, the number of times of transmitting the power reception timing signal TM is reduced and the proportion of time available for power supply per unit time is increased. Thus, it becomes possible to supply more power to the power receiving apparatuses A, B, and C.

  In the example shown in FIG. 3B, it is assumed that the number of power receiving devices A, B, and C is fixed with respect to the change pattern, and the order in which power is received is also fixed. 3 is variable, a power reception timing signal TM including the order information PT is transmitted as shown in FIG. 3C, and the power receiving devices A, B, and C receive power for a specified period according to the order information PT. Power may be received during the period Tu. Similar to the example shown in FIG. 3B, the power reception period Tu is a fixed time.

  In the power reception control unit 21 in each of the power receiving devices A, B, and C, the power reception period Tu that is received by itself is obtained from the order instructed by the order information PT of the power reception timing signal TM, and from the DC supply line Wdc during the obtained power reception period Tu. Receive power.

  In this operation, since the order information PT is transmitted to the power receiving devices A, B, and C, when the number of power receiving devices A, B, and C that receive power changes due to on / off of the DC device 102 or the like. However, since it is possible to easily cope with changes in the number of power receiving devices A, B, and C, it is possible to apply a voltage that does not include power receiving devices A, B, and C, which are power receiving partners, to the DC supply line Wdc. Therefore, the power receiving devices A, B, and C can receive power without waste.

  In addition, since each power reception timing signal TM includes order information PT, it is possible to flexibly cope with a change in the number of power reception devices A, B, and C. That is, the time interval T3 for generating the power reception timing signal TM is variable. Similarly to the operation example of FIG. 3B, since the number of times the power reception timing signal TM is generated is smaller than that of the operation example of FIG. 3A, the proportion of time available for power supply per unit time increases.

  By the way, in the operation example shown in FIGS. 3B and 3C, the output voltage of the power supply circuit unit 10 is changed according to a known or instructed change pattern. Therefore, the power reception timing signal TM is set by appropriately setting the change pattern. Is transmitted to the power receiving devices A, B, and C multiple times each time. That is, as in the example shown in FIG. 3B, not only the operation of causing the power receiving devices A, B, and C to receive power once when the power reception timing signal TM is transmitted once, but also in FIG. As in the example shown, any of the power receiving devices A, B, and C (the power receiving device A in the illustrated example) can be made to receive power a plurality of times.

  By allowing the power to be received a plurality of times in this manner, the amount of power received per unit time can be increased as necessary, and power can be supplied even when the DC device 102 requires a large amount of power. It becomes possible. Here, when power is supplied to the same power receiving devices A, B, and C multiple times for one transmission of the power receiving timing signal TM, the power receiving periods Tu of the same power receiving devices A, B, and C are more dispersed than concentrated. It is desirable to have. That is, by dispersing the power reception periods Tu, the change amount (difference between the maximum value and the minimum value) of the amount of charge accumulated in the power storage unit 22 provided in the power reception devices A, B, and C becomes small, and the DC device 102 The stability of the voltage supplied to the battery is increased.

  In the technique shown in FIG. 3A, the identification information ID for designating the power receiving apparatuses A, B, and C is notified by the power reception timing signal TM. Therefore, the technique shown in FIG. In addition, it is possible to vary the amount of power supplied to the power receiving devices A, B, and C per unit time.

  In the operation example shown in FIGS. 3A to 3C, one power reception period Tu of the power receiving apparatuses A, B, and C is a fixed time, but the power receiving apparatuses A, B, and C receive power per unit time. As a technique for changing the amount of power to be generated, it is possible to adopt a method in which the time of one power reception in each of the power receiving apparatuses A, B, and C is different. When this technique is adopted, each power receiving device A, B, C needs to know the order and time for receiving power. The order of receiving power can be shown as order information PT as in the operation example of FIG. 3C, but if the number of power receiving devices A, B, and C is fixed, the order information PT is not presented. Also good. FIG. 3D shows an operation example using the power reception timing signal TM not including the order information.

  That is, in the operation example shown in FIG. 3D, the power receiving devices A, B, and C receive power in a known order, and the power receiving timing signal TM indicates the time that each power receiving device A, B, and C receives power. The designated time information PR is included as a change pattern. Further, in the DC power supply apparatus 101, the voltage received by each of the power receiving apparatuses A, B, and C is applied to the DC supply line Wdc by continuing the time for which the power receiving apparatuses A, B, and C are to receive power. On the other hand, each of the power receiving devices A, B, and C receives power during a specified period indicated by the time information PR included in the power reception timing signal TM. Therefore, the time interval T4 at which the power reception timing signal TM is generated is variable, and the power reception period for each time is also variable.

  In this operation, the change pattern can be changed every time the power reception timing signal TM is generated, and flexible power supply can be performed according to the DC device to be operated. That is, by supplying power to the DC device 102 with low power consumption for a short time and supplying power to the DC device 102 with high power consumption for a long time, it is possible to supply power to each DC device 102 without excess or deficiency. become.

  A change pattern that is a time change of the voltage applied to the DC supply line Wdc by the DC power supply device 101 may be instructed to the DC power supply device 101 using an appropriate indicating device (for example, the display device 117). However, in order to flexibly cope with changes in the number of power receiving devices A, B, and C, it is desirable to determine a change pattern in response to a request for power supply from each power receiving device 103. For example, the power receiving apparatus 103 monitors the operating state (ON / OFF or power consumption) of the DC device 102, requests power supply to the DC power supply device 101 according to the operating state of the DC device 102, and controls the DC power supply device 101. It is desirable to determine the change pattern in the control unit 12. In this operation, it becomes possible to perform power supply flexibly responding to changes in the operation of the DC device 102 so as not to be excessive or deficient, leading to promotion of energy saving.

  Although the example in which the power supply side communication unit 14 directly communicates with the power reception side communication unit 23 of the power reception device 103 has been shown, communication is performed between the power supply side communication unit 14 and the power reception side communication unit 23 via the home server 116. May be performed.

It is a principal part block diagram which shows embodiment. It is a principal part block diagram of the other structural example same as the above. It is operation | movement explanatory drawing same as the above. It is a block diagram which shows the whole structure same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power supply circuit part 11 Voltage control part 12 General control part 13 Timing signal generation part 14 Power supply side communication part 21 Power reception control part 22 Power storage part 23 Power reception side communication part 101 DC power supply apparatus 102,102 'DC apparatus 103 Power reception apparatus 131 DC Outlet
132 Catch ceiling (Outlet)
H House (Building)
Wdc DC supply line

Claims (10)

A DC power supply device that supplies DC power; a plurality of power receiving devices that receive DC power from the DC power supply device via a DC supply line; and a DC device that is driven by the DC power received by each power receiving device. The DC power supply device includes a power supply circuit unit capable of selecting an output voltage from a plurality of types, a voltage control unit that selects an output voltage of the power supply circuit unit, and a power supply side communication unit that communicates with the power receiving device. A timing signal generation unit that generates a power reception timing signal that specifies a timing for power reception by the power reception device, and sends the power reception timing signal to the DC supply line as a communication signal to the power reception device through the power supply side communication unit; General control of the output voltage of the power supply circuit unit to the voltage control unit so that the DC voltage required to drive the DC device can be received at the timing specified by the signal The power receiving device receives DC power from the DC supply line at a timing indicated by a power receiving side communication unit that communicates with the DC power supply device and a power receiving timing signal received through the power receiving side communication unit. A power supply system comprising: a power reception control unit configured to store the DC power received by the power reception control unit and supplying the stored DC power to a DC device.   The overall control unit instructs the voltage control unit to output voltage of the power supply circuit unit so that the DC voltage necessary for driving the DC device is received for each power reception device, and the power supply circuit unit is provided for each power reception device. Before the power supply circuit unit outputs the output voltage of the power receiving circuit, the timing signal generating unit transmits a power receiving timing signal including identification information of the power receiving device, and the power receiving control unit is configured so that the power receiving side communication unit is connected to the power receiving device. 2. The power supply system according to claim 1, wherein DC power is received from the DC supply line in a specified period after receiving a power reception timing signal including identification information.   The overall control unit instructs the output voltage of the power supply circuit unit to the voltage control unit with a change pattern of a fixed period in which power reception periods are arranged for a fixed time, and to the timing signal generation unit for every cycle of the change pattern. A power reception timing signal to be a synchronization signal is transmitted, and the power reception control unit receives the power reception timing signal to be a synchronization signal from the power supply side communication unit from the DC supply line in a known specified period of the change pattern. The power supply system according to claim 1, wherein the power supply system receives DC power.   The overall control unit instructs the voltage control unit to output voltage of the power supply circuit unit to the voltage control unit in a predetermined change pattern defined by a combination of power reception periods for each predetermined time, and receives power for each change pattern. A power reception timing signal including information is transmitted to the timing signal generation unit, and the power reception control unit is configured to transmit the direct current in a specified period according to order information included in the power reception timing signal after the power reception side communication unit receives the power reception timing signal. The power supply system according to claim 1, wherein DC power is received from the supply line.   5. The power supply system according to claim 3, wherein the power receiving device is allowed to receive power a plurality of times from the DC supply line in the change pattern.   The overall control unit instructs the voltage control unit to output voltage of the power supply circuit unit in a predetermined change pattern defined by a combination of variable time power reception periods, and receives time information of a power receiving device for each change pattern The power reception control unit transmits the direct current supply in a specified period according to time information included in the power reception timing signal after the power reception side communication unit receives the power reception timing signal. The power supply system according to claim 1, wherein DC power is received from the line.   The power supply system according to claim 4, wherein the overall control unit determines the change pattern in response to a request for power supply from the power receiving device.   The power supply system according to any one of claims 1 to 7, wherein the power receiving device is provided in an outlet connected to the DC supply line and to which the DC device is detachably connected.   The power supply system according to claim 1, wherein the power reception device is provided in the DC device. A power supply circuit unit that allows the output voltage to be applied to the DC supply line to be selected from a plurality of types and causes the power receiving device connected to the DC supply line to receive DC power; a voltage control unit that selects the output voltage of the power supply circuit unit; , A power supply side communication unit that communicates with the power reception device, and a power reception timing signal that specifies a timing for power reception by the power reception device, and a power reception timing signal as a communication signal to the power reception device through the power supply side communication unit to the DC supply line A timing signal generator for sending, and a general control unit for instructing the voltage control unit to output voltage of the power supply circuit unit so that the power receiving device can receive the DC voltage necessary for driving the DC device at the timing specified by the power reception timing signal A direct-current power supply device comprising:

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