JP2009165250A - Dc power distribution system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize a voltage level of DC power supplied to a DC apparatus. <P>SOLUTION: A voltage feedback part 21 of the DC apparatus 2 compares a voltage V3 changing in proportion to an applied voltage V2' of a DC supply line Wdc with a predetermined threshold value Vth and transmits the comparison result (information) to a DC power supply unit 1 through a feedback line Lf. In the DC power supply unit 1, a controller 11 controls a DC-DC converter 10 in accordance with information received from the DC apparatus 2 to adjust a voltage level V2 of the DC power supplied to the DC apparatus 2. Thus, the voltage level V2' of the DC power supplied to the DC apparatus 2 can be stabilized. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a DC power distribution system including a DC device that operates with DC power and a DC power supply device that supplies DC power to the DC device through a DC supply line.

Conventionally, there has been one disclosed in Patent Document 1 as a DC distribution system that distributes DC power indoors. This conventional system has a distribution board 2 and an AC power outlet 16, a DC output power terminal 12 is provided in the AC power outlet 16, and a transformer 8 and a rectifier 10 are provided in the distribution board 2. The converter 8 converts an alternating voltage of 100 volts or 200 volts into three kinds of alternating voltages of 6 volts, 3 volts, and 1.5 volts, and then rectifies these alternating voltages with the rectifier 10. As a result, three types of DC voltages of 6 volts, 3 volts, and 1.5 volts were obtained.
Japanese Utility Model Publication No. 4-128024

  However, in the above conventional example, since three types of DC voltages created in the distribution board 2 are distributed to the DC output power supply terminal 12, the influence of the voltage drop due to the wiring resistance becomes large especially at a low voltage. Therefore, there has been a problem that the voltage supplied to the DC device as a load is not stable.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a DC distribution system capable of stabilizing the voltage level of DC power supplied to DC equipment.

  In order to achieve the above object, a first aspect of the present invention includes a DC device that operates with DC power and a DC power supply that supplies DC power to the DC device through a DC supply line. Information transmission means for sending information on the voltage level of the DC power supplied through the DC supply line, and the DC power supply device is supplied from the outside with information receiving means for receiving the information sent from the DC equipment Power conversion means for converting power into DC power of a predetermined voltage level, and control means for controlling the power conversion means so as to adjust the voltage level according to the information received from the DC equipment are provided.

  According to the first aspect of the present invention, the control means of the DC power supply device controls the power conversion means according to the information received from the DC equipment to adjust the voltage level of the DC power supplied to the DC equipment. The voltage level of the direct current power can be stabilized.

  According to a second aspect of the present invention, in the first aspect of the invention, the information transmitting means of the DC device and the information receiving means of the DC power supply device transmit information by transmitting a signal superimposed on the DC voltage applied to the DC supply line. It is characterized by giving and receiving.

  According to the second aspect of the present invention, wiring and construction can be saved by using a transmission line for transmitting a transmission signal also as a DC supply line.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the DC power supply device is housed in an outlet that is embedded in a wall surface.

  According to the invention of claim 3, space can be saved by storing the DC power supply device in the outlet.

  A fourth aspect of the present invention is the AC / DC converter according to any one of the first to third aspects, wherein the power conversion means of the DC power supply device converts AC power supplied from the AC power system into DC power. And a DC / DC converter for converting the voltage level of the DC power converted by the AC / DC converter to a desired voltage level.

  According to the present invention, it is possible to stabilize the voltage level of DC power supplied to a DC device.

(Embodiment 1)
The DC power distribution system of the present embodiment includes a DC device 2 that operates with DC power as shown in FIG. 1 and a DC power supply device 1 that supplies DC power to the DC device 2 through a DC supply line Wdc.

  The DC power supply 1 is fed back from a DC / DC converter 10 that converts a voltage level V1 of DC power supplied from a DC power system into a desired voltage level V2 (<V1), and a DC device 2 as will be described later. And a controller 11 that controls the DC / DC converter 10 according to the information to adjust the output voltage V1. The direct current / direct current converter 10 is composed of, for example, a flyback type DC / DC converter composed of a switching element, a flyback transformer, etc., and steps down the input voltage V1 to the output voltage V2 and outputs it to the direct current supply line Wdc. . The controller 11 adjusts the output voltage V1 of the DC / DC converter 10 by PWM control of the switching element. Here, the voltage level V2 ′ of the DC power supplied to the DC device 2 through the DC supply line Wdc is lower than the output voltage V2 of the DC / DC converter 10 due to a voltage drop due to the wiring resistance of the DC supply line Wdc ( V2> V2 ′).

  The DC device 2 uses a load circuit 20 that consumes DC power to perform a predetermined operation, and a voltage that is information transmission means that sends information on the voltage level of the DC power supplied to the DC power supply device 1 through the DC supply line Wdc. And a feedback unit 21. As shown in FIG. 2, the voltage feedback unit 21 compares a voltage V3 that changes in proportion to the applied voltage V2 ′ of the DC supply line Wdc with a predetermined threshold value Vth, and uses the comparison result as the information as a feedback line Lf. The signal is transmitted (feet back) to the DC power supply device 1 through. As a method for generating the voltage V3, there is a method in which the voltage V2 'applied to the DC supply line Wdc is divided by a voltage dividing resistor. Here, the threshold value Vth is a value corresponding to a specified voltage (rated voltage) to be supplied to the load circuit 20, and is, for example, a value obtained by multiplying the specified voltage by a voltage dividing ratio of the voltage dividing resistor.

  On the other hand, in the DC power supply 1, information sent from the DC device 2 through the feedback line Lf (for example, a high level signal when the voltage V3 is higher than the threshold value Vth, and the voltage V3 is higher than the threshold value Vth). Is also low, a low level signal) is input to the control unit 11. The control unit 11 controls the DC / DC conversion unit 10 so as to decrease the output voltage V2 when a high level signal is input, and outputs the output voltage V2 when a low level signal is input. The DC / DC conversion unit 10 is controlled so as to increase.

  As described above, according to the present embodiment, the control unit 11 of the DC power supply device 1 controls the DC / DC conversion unit 10 according to the information received from the DC device 2, and the DC power voltage level V <b> 2 supplied to the DC device 2. Therefore, the voltage level V2 ′ of the DC power supplied to the DC device 2 can be stabilized. Note that an AC / DC converter (AC / DC converter) is provided before the DC / DC converter 10 in the DC power supply device 1, and AC power supplied from an AC power supply system (commercial power supply system) is supplied to the AC / DC converter. After the conversion to DC power, the DC / DC conversion unit 10 may convert the DC power to a desired voltage level.

(Embodiment 2)
The DC power distribution system of this embodiment transmits and receives information (feedback information) between the DC power supply device 1 and the DC device 2 by a transmission signal transmitted by being superimposed on the DC voltage V2 applied to the DC supply line Wdc. There is a feature in the point. However, since the basic configuration of the present embodiment is the same as that of the first embodiment, the same reference numerals are given to the same components as those of the first embodiment, and the description thereof will be omitted.

  The DC device 2 in the present embodiment compares the voltage level V2 ′ of the DC power supplied through the DC supply line Wdc with a specified voltage (rated voltage) as shown in FIG. A control unit 22 that generates feedback information (message) indicating a magnitude relationship; a data transmission unit 23 that transmits a transmission signal including the message generated by the control unit 22 to the DC power supply device 1 through the DC supply line Wdc; It has.

  On the other hand, the DC power supply device 1 in this embodiment includes a data transmission unit 12 that receives a transmission signal transmitted from the DC device 2 through the DC supply line Wdc, and a message (feedback) included in the transmission signal received by the data transmission unit 12. And a controller 11 that performs PWM control of the DC / DC converter 10 in accordance with (information). When the content of the feedback information indicates that the voltage level V2 ′ is higher than the specified voltage, the control unit 11 controls the DC / DC conversion unit 10 to decrease the output voltage V2, and the content of the feedback information When the voltage level V2 ′ is lower than the specified voltage, the DC / DC converter 10 is controlled to increase the output voltage V2.

  As described above, also in the present embodiment, the control unit 11 of the DC power supply device 1 controls the DC / DC conversion unit 10 according to the information received from the DC device 2 and sets the voltage level V2 of the DC power supplied to the DC device 2. Since the adjustment is performed, the voltage level V2 ′ of the DC power supplied to the DC device 2 can be stabilized. In addition, in the present embodiment, since the exchange of information between the DC power supply device 1 and the DC device 2 is performed by a transmission signal transmitted by being superimposed on the DC voltage applied to the DC supply line Wdc, the embodiment is described. As shown in FIG. 1, there is an advantage that the feedback line Lf for information transmission is not required and wiring saving and construction can be achieved.

  Here, you may make it accommodate the DC power supply device 1 in Embodiment 1, 2 in the inside of the electrical outlet embedded by the wall surface. As shown in FIG. 4, such an embedded outlet 3 includes a box-shaped body 30 that is disposed in such a manner that a rear end portion is inserted into an embedded hole H opened in a wall W, It has a receptacle 31 provided in the center of the front surface of the container body 30 exposed outside the hole H, and the container body 30 is attached to a mounting frame (not shown) so as to be embedded in the embedded hole H. A plug 25 provided at one end of a power cable 24 corresponding to a DC supply line is plugged into the receptacle 31 so as to be freely inserted and removed. Then, the plug 26 provided on the other end of the power cable 24 is plugged into the receptacle 27 of the DC device 2, so that the DC power supply 1 housed in the body 30 of the outlet 3 through the power cable 24 is connected. DC power can be supplied to the DC device 2. If the DC power supply device 1 is housed in the outlet 3 in this way, space can be saved and the DC device 2 can be connected to the power cable even when the specified voltage (rated voltage) of the DC device 2 is different for each type. If it connects to the outlet 3 by 24, the DC power of the appropriate voltage level according to the regulation voltage of the DC device 2 will be supplied.

  FIG. 5 is a system configuration diagram showing another embodiment of the present invention. The embodiments described below are described assuming a detached house as a building to which the present invention is applied, but this does not preclude the application of the technical idea of the present invention to an apartment house. As shown in FIG. 5, the house H is provided with a DC power supply unit 101 that outputs DC power and the DC device 2 described above, and a DC supply line Wdc connected to the output end of the DC power supply unit 101. Through this, DC power is supplied to the DC device 2. A current flowing through the DC supply line Wdc is monitored between the DC power supply unit 101 and the DC device 2, and when an abnormality is detected, power is supplied from the DC power supply unit 101 to the DC device 2 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.

  The DC supply line Wdc is connected to the home server 116 via the DC power supply unit 101. The home server 116 is a main device that constructs a home communication network (hereinafter referred to as “home network”), and communicates with a subsystem and the like constructed by the DC device 2 in the home network.

  In the example shown in the figure, as an subsystem, an illumination system comprising an information equipment DC device 2 comprising an information system DC equipment 2 such as a personal computer, a wireless access point, a router, and an IP telephone, and an illumination system DC equipment 2 such as a lighting fixture. There are K102, K105, an intercom system K103 composed of a DC device 2 for handling visitors, monitoring intruders, etc., and a residential alarm system K104 composed of an alarm DC device 2 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 the DC equipment 2 connected to the DC outlet 131 that is 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 2) arranged in advance in the house H and a lighting device (DC device 2) 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 luminaire that is the DC device 2 constituting the illumination 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 2. In addition, a control instruction may be given by a communication signal from another DC device 2 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.

  Arbitrary DC equipment 2 can be connected to the DC outlet 131 and the hooking ceiling 132 described above, and since DC power is output to the connected DC equipment 2, 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 2 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 2 connected to the DC outlet has a communication function, a communication signal can be transmitted through the DC supply line Wdc. Not only the DC device 2 but also the DC outlet is provided with a communication function.

  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 devices connected to the home network through the wide area network NT (including mainly the DC device 2 but other devices having a communication function). 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 unit 101 basically generates DC power by power conversion of an AC power supply AC supplied from outside the house like a commercial power supply. In the configuration shown in the figure, the AC power source AC is input to an AC / DC converter 112 including a switching power source through a main circuit breaker 111 attached to the distribution board 110 as an internal unit. The DC power output from the AC / DC converter 112 is connected to each DC breaker 114 through the cooperative control unit 113.

  The DC power supply unit 101 is provided with a secondary battery 162 in preparation for a period in which power is not supplied from the AC power supply AC (for example, a power failure period of the commercial power supply AC). It is also possible to use a solar cell 161 or a fuel cell 163 that generates DC power. The solar battery 161, the secondary battery 162, and the fuel battery 163 are distributed power supplies with respect to the main power supply including the AC / DC converter 112 that generates DC power from the AC power supply AC. In the illustrated example, the solar cell 161, the secondary battery 162, and the fuel cell 163 include a circuit unit that controls the output voltage, and the secondary battery 162 includes a circuit unit that controls charging as well as discharging.

  Of the distributed power sources, the solar cell 161 and the fuel cell 163 are not necessarily provided, but the secondary battery 162 is preferably provided. The secondary battery 162 is charged in a timely manner by a main power source or other distributed power source, and the secondary battery 162 is discharged not only in a period in which power is not supplied from the AC power source AC but also in a timely manner as necessary. The 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 unit 101 to the DC device 2. 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 2 is selected from a plurality of types of voltages according to the device, the above-described DC / DC converter is provided in the cooperative control unit 113, and the DC voltage obtained from the main power source and the distributed power source is changed to a necessary voltage. It is desirable to convert. Normally, one type of voltage is supplied to one subsystem (or DC equipment 2 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 2. 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 2.

  In the above example, the AC / DC converter 112 is arranged in the distribution board 110 in order to convert the AC power output from the main breaker 111 into DC power by the AC / DC converter 112. On the output side, a branch breaker (not shown) provided in the distribution board 110 branches the AC supply line into a plurality of systems, and an AC / DC converter is provided on the AC supply line of each system to convert it into DC power for each system. You may employ | adopt the structure to do.

  In this case, since the DC power supply unit 101 can be provided for each floor or room of the house H, the DC power supply unit 101 can be managed for each system, and the DC device 2 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.

  In the system configuration described above, for example, the DC power supply device 1 described above may be incorporated in the DC breaker 114 or the DC outlet.

1 is a system configuration diagram showing Embodiment 1 of the present invention. It is operation | movement explanatory drawing same as the above. It is a system block diagram which shows Embodiment 2 of this invention. It is a schematic block diagram which accommodated the DC power supply device in the same as the inside of an outlet socket. It is a system configuration | structure figure which shows other embodiment same as the above.

Explanation of symbols

1 DC power supply device 2 DC equipment 10 DC / DC converter (power conversion means)
11 Control unit (information receiving means, control means)
20 Load circuit 21 Voltage feedback section (information transmission means)

Claims (4)

A DC device that operates with DC power, and a DC power supply that supplies DC power to the DC device through a DC supply line,
The DC device comprises information transmitting means for sending voltage level information of DC power supplied through a DC supply line to the DC power supply device,
The DC power supply device includes information receiving means for receiving the information sent from the DC equipment, power conversion means for converting externally supplied power into DC power of a predetermined voltage level, and voltage according to the information received from the DC equipment. And a control means for controlling the power conversion means so as to adjust the level.   2. The DC power distribution according to claim 1, wherein the information transmitting means of the DC device and the information receiving means of the DC power supply device exchange information by a transmission signal transmitted by being superimposed on the DC voltage applied to the DC supply line. system.   The DC power distribution system according to claim 1 or 2, wherein the DC power supply device is housed in an outlet embedded in a wall surface.   The power conversion means of the DC power supply device includes an AC / DC converter that converts AC power supplied from the AC power system into DC power, and a voltage level of the DC power converted by the AC / DC converter is a desired voltage level. The DC power distribution system according to any one of claims 1 to 3, further comprising: a DC / DC converting unit that converts to a DC.

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