JP5049040B2 - DC power distribution system - Google Patents

Description

  The present invention relates to a DC distribution system that distributes DC through a power supply line from a DC power source to a DC device as a load device in a house or a building.

In general, when power is supplied to an electrical device, AC power is supplied via a power supply line that is wired in advance in a building. On the other hand, DC power is often supplied to internal circuits except when power and heat are used in electrical equipment. In electrical equipment that mainly handles information such as sound, video, and communication, AC power is used. Many are equipped with a power conversion adapter for converting to DC power. As a result, a large number of power conversion adapters are connected to the outlet in order to handle this type of electric equipment, and there is a problem that the periphery of the electric equipment tends to be messy. In order to solve such a problem, it is considered to supply DC power through a preceding wiring (for example, see Patent Document 1). If DC power is supplied using a power supply line wired in advance, the power conversion adapter becomes unnecessary, and the surroundings of the electrical equipment can be prevented from becoming messy.
JP 2003-274542 A

  By the way, when AC power is supplied by preceding wiring, the current supplied to the power supply line is limited as a rated value using a breaker or the like arranged in the distribution board, and the power supply line connected to the breaker When the current flowing through the capacitor becomes larger than the rated value, the breaker is cut off at a timing according to the current value, thereby protecting the power supply line and the electric equipment and preventing the overload from affecting the power source.

  On the other hand, electrical equipment using DC power (hereinafter referred to as “DC equipment”) has many functions for handling information as described above. For example, there are DC equipment used for crime prevention and disaster prevention. If some types of direct current equipment stop operating, the purpose of crime prevention and disaster prevention cannot be achieved. In addition, a DC device (for example, a linked operation of a switch and a load) that operates in cooperation through a communication network such as a home network or a wide area network becomes inoperable unless DC power can be secured.

  Therefore, except for cases where there is a danger such as overheating of the power supply line such as a short circuit of the power supply line, operation of all DC devices can be performed by adopting a configuration that cuts off the power supply due to overload, such as a breaker. It is desirable that the protection operation that stops is not functioning. Furthermore, if the DC device is always connected to the power supply line, the maximum current supplied to the power supply line is already known, so the wiring design can be performed so that no overload occurs in the power supply line. When a DC device that can be attached to and detached from the power supply line is used, an overload of the power supply line cannot be predicted in advance, and cannot be handled depending on the wiring design. That is, some protection against overload is required.

  The present invention has been made in view of the above reasons, and its purpose is to determine in advance the supply and demand balance of power between a DC power source and a DC device, and to use the DC device when it is within the range of power supply capability. It is to provide a DC power distribution system that can prevent overload by permitting.

The invention of claim 1 includes a DC power source that outputs DC power and a DC device driven by DC power supplied from the DC power source via a power supply line, and the DC device is a main circuit as a functional unit. When the information retaining unit to retain the index value of the power consumption during operation as an electric information, and a device communication unit that transmits electrical information to a DC power source information retaining unit's, the power from the power supply line, the apparatus communication A switching element that switches between a state of supplying only to the unit and a state of supplying to the device communication unit and the main circuit, and the DC power source communicates with a DC device connected to a power supply line that supplies DC power. A power communication unit that acquires electrical information, a supply current setting unit that sets a supply current value defined as an output of a DC power source by the configuration of the power supply line, and an electric power supply based on the index value acquired by the power communication unit A request current calculation unit for determining the required current value required for the line, compared with the supply current value and the required current value in a state in which power is supplied only to the device communication unit, the request current value does not exceed the supply current value It is characterized in that it includes a permission determining unit that sometimes permits the use of a DC device and supplies power to the device communication unit and the main circuit by switching the switch element .

  According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of the DC devices are provided, and the required current calculation unit sums the index values respectively obtained from the device communication units of the DC devices, and A required current value required for the power supply line is obtained.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, communication between the device communication unit and the power supply communication unit is performed using the power supply line as a communication path and using a high frequency carrier wave. Is transmitted.

  According to a fourth aspect of the invention, in the third aspect of the invention, the power supply line is branched into a plurality of systems, and transmission and blocking of a carrier wave that transmits information between the device communication unit and the power supply communication unit. An information filter for selecting is provided for each system.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the information processing apparatus further comprises a selection unit that selects passage and blocking of the carrier wave for each information filter, and the required current calculation unit selects the information filter that passes the carrier wave by the selection unit. A required current value for each of the power supply lines is obtained by selecting.

  According to a sixth aspect of the present invention, in the fourth or fifth aspect of the present invention, the required current calculation unit is configured to calculate each system based on a total of index values obtained from the DC devices for each system of the power supply line. A required current value is obtained for each power supply line.

  According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, when the required current value exceeds the supply current value in the comparison result in the permission determining unit, A control unit for reducing a current used in the DC device by communicating with the DC device through a power communication unit is added.

  In the invention of claim 8, in the invention of any one of claims 1 to 6, when the requested current value exceeds the supply current value in the comparison result in the permission determination unit, the DC power supply A control unit for stopping the supply of DC power to the power supply line is added.

  According to a ninth aspect of the present invention, in the invention according to any one of the first to sixth aspects, when the required current value exceeds the supply current value in the comparison result of the permission determining unit, The control part which alert | reports an unusable through a alerting | reporting part is added, It is characterized by the above-mentioned.

  According to a tenth aspect of the present invention, in the invention according to any one of the first to ninth aspects, the DC device includes a sleep mode in which only the device communication unit operates, and a normal mode in which the device communication unit operates together with the main circuit. The DC device communicates with the DC power supply in the sleep mode, and shifts to the normal mode when the required current value does not exceed the supply current value in the comparison result in the permission determination unit.

  According to an eleventh aspect of the present invention, in the invention according to any one of the first to tenth aspects, the required current calculation unit is an index from a DC device at least one of when a DC power supply is turned on and when the DC device is added. A value is acquired, and the permission determination unit determines whether or not the DC device can be used.

According to the configuration of the first aspect of the present invention, the DC device has the index value of the power used during operation as electrical information, and the DC power supply has the electrical information from the DC device connected to the power supply line for supplying DC power. Obtain the required current value required for the power supply line from the acquired electrical information, compare the supply current value specified by the configuration of the power supply line with the required current value, the required current value is Since the use of DC equipment is permitted when the supply current value is not exceeded, it is possible to determine in advance whether or not the power demand side will be overloaded with respect to the power supply side. By permitting the use of the device, it is possible to prevent overload. In other words, by preventing the occurrence of overload due to the operation of the DC equipment, it is not necessary to cut off the power supply due to overload except in situations where the frequency of occurrence is low, such as a short circuit of the power supply line, The frequency of system down can be reduced. In particular, since the switch element switches between a state where power from the power supply line is supplied only to the device communication unit and a state where the power is supplied to the device communication unit and the main circuit, on / off of power supply to the main circuit by the switch element If it is determined that power is supplied to the main circuit, it is possible to prevent overload by prohibiting power supply to the main circuit by the switch element.

  According to the configuration of the invention of claim 2, since the index values acquired for all of the plurality of DC devices are totaled and the required current value is obtained from the total index value, the required current value can be obtained with high accuracy, The occurrence of overload can be surely prevented.

  According to the configuration of the invention of claim 3, since the information transmission signal is superimposed on the power supply line, it is not necessary to separately wire the communication line, and the communication range varies depending on the environment as in wireless communication. There is no need to do.

  According to the configuration of the invention of claim 4, it is possible to communicate with the DC device for each system using the information filter when a plurality of power supply lines are provided.

  According to the configuration of the fifth aspect of the invention, when a plurality of power supply lines are provided, the required current value is obtained for each system using the information filter. It is possible to permit use only for DC devices that do not occur.

  According to the configuration of the invention of claim 6, since the required current value is obtained based on the sum of the index values obtained from the DC devices for each system of the power supply path, the required current value for each system is accurately obtained. As a result, it is possible to reliably prevent an overload from occurring in each power supply path system.

  According to the configuration of the invention of claim 7, since the current used in the DC device is reduced, even if all DC devices operate, even if the DC power supply or the power supply path is overloaded, some It is possible to prevent overload by reducing the current used in the DC device. In particular, when DC devices are added to the power supply line and connected, operating all the DC devices may cause overload. However, by reducing the current used by some DC devices, Overload can be prevented while permitting the use of.

  According to the configuration of the invention of claim 8, since the supply of DC power from the DC power supply to the power supply line is stopped when the required current value exceeds the supply current value, the design change of the DC power supply or the DC equipment Reduction can be encouraged.

  According to the configuration of the ninth aspect of the invention, since the notification is made when the required current value exceeds the supply current value, it is possible to promote the design change of the DC power supply and the reduction of the DC equipment.

  According to the configuration of the invention of claim 10, the DC device communicates in the sleep mode, and the DC device is shifted to the normal mode when the required current value does not exceed the supply current value. A load can be prevented. This operation is particularly effective when a DC device is added to the power supply line and connected, and even if all DC devices operate, even if the DC power supply or power supply path is overloaded, it will be overloaded. It becomes possible to operate necessary DC equipment while preventing the load. In addition, since communication between the DC power supply and the DC device is possible even in the sleep mode, the DC device that is in the sleep mode can be switched to the normal mode.

  According to the configuration of the invention of claim 11, since the index value is acquired from the DC device at least one of when the power is turned on or when the DC device is added, the power supply / demand relationship of the DC distribution system is designed when the power is turned on. The contents can be confirmed, and if a DC device is added, it can be determined whether or not the DC device can be added. When acquiring electrical information from a DC device at power-on, it is desirable to obtain responses from all DC devices connected to the power supply line by broadcast communication. When acquiring electrical information, it is desirable to notify the DC power supply of addition from the DC device, and in response to this notification, the DC power source acquires the electrical information of the DC device. That is, electrical information is collected for all DC devices connected to the power supply line when the power is turned on, and electrical information is collected only for the added DC devices when the DC devices are added.

  As shown in FIG. 1, the present invention basically includes a DC power source 1 disposed on a distribution board and a DC device 2 as a load driven by DC power, and is connected to the DC power source 1. The DC power is supplied to the DC device 2 through the power supply line Lp. In the illustrated example, the power supply line Lp from the DC power source 1 to the DC device 2 is branched into a plurality of systems (three systems in the illustrated example), but only one system may be used. In the following, when it is necessary to distinguish each system, the power supply lines Lpa, Lpb, and Lpc are distinguished by adding symbols a, b, and c.

  An information line Ls for communication is provided together with a power supply line Lp for supplying DC power (when necessary, the information lines Lsa, Lsb, and Lsc are distinguished by adding symbols a, b, and c), Each DC device 2 can be connected to the information line Ls. The information line Ls may be provided independently of the power supply line Lp, or may also be used as the power supply line Lp. When the power supply line Lp and the information line Ls are used together, communication is performed by superimposing a high-frequency carrier wave used for information transmission on a DC voltage. In addition, a wireless communication path can be formed instead of the information line Ls. In the following, it is assumed that the power supply line Lp and the information line Ls are wired and are provided separately.

  The configuration for supplying power in the DC power supply 1 is based on a power converter 1a including an AC / DC converter that converts AC power AC such as commercial power into DC power. A distributed power source 1b using a power generator, a fuel cell, an engine-driven generator, or the like can be used in combination. When the distributed power source 1b is used in combination, the outputs of the power converter 1a and the distributed power source 1b are adjusted according to a request from the DC device 2. However, in the following description, the operation of the distributed power supply 1b is not particularly described, and the power supply in the DC power supply 1 is described as being performed by the power converter 1a.

  An information filter 3 is inserted in the information line Ls between the DC power source 1 and the DC device 2. In the illustrated example, the information filter 3 is disposed between the branch points of the information lines Lsa, Lsb, and Lsc and the DC device 2. That is, it corresponds to providing the information filter 3 for each power supply line Lpa, Lpb, Lpc of each system.

  The information filter 3 has a function of selecting whether or not to pass a high-frequency carrier wave used for information transmission, and determines whether or not to transmit information between the DC power source 1 and the DC device 2 using the power supply line Lpa. , Lpb, and Lpc. Whether the information filter 3 passes or blocks the carrier wave is instructed by a selection unit 16 (described later) provided in the DC power supply 1.

  The DC power supply 1 includes a controller 10 having a microcomputer. The controller 10 includes a power communication unit 11 that communicates with the DC device 2 through the information line Ls, and a power converter 1a based on information obtained from the power communication unit 11. And a control unit 12 for controlling the operation of the above. Further, the controller 10 includes a supply current setting unit 13 that sets a supply current value supplied by the DC power supply 1 and a request current calculation unit 14 that calculates a request current value required by the DC device 2 connected to the power supply line Lp. And a permission determination unit 15 that compares the requested current value with the supplied current value and permits use of the DC device 2 when the requested current value does not exceed the supplied current value.

  In the configuration example shown in FIG. 1, the power converter 1a, the information filter 3, and the controller 10 are housed in the body of the DC power source 1, and a set of input connection ports for receiving the DC output of the distributed power source 1b. T1 and three sets of output connection ports T2 for connecting the three power supply lines Lpa, Lpb, and Lpc are provided. However, the configuration in which the power converter 1a, the information filter 3 and the controller 10 are housed in separate bodies, the power converter 1a and the controller 10 are housed in one body, and the information filter 3 is placed in another body. It is also possible to employ other configurations such as a storage configuration. Further, the number of branches of the power supply line Lp may be designed as appropriate, and may not be branched. However, when housed in the distribution board, the power supply line system for supplying power to the DC device 2 as an internal device of the distribution board and the power supply line for supplying power to the DC device 2 installed outside the distribution board It is desirable to branch off from this system. In the illustrated example, the information filters 3 corresponding to the power supply lines Lpa, Lpb, and Lpc of each system are arranged inside the body of the DC power supply 1.

  By the way, the DC device 2 includes a main circuit 20 as a functional unit that performs various operations according to the DC device 2 such as operation, monitoring, display, and notification, and a device communication unit 21 that communicates with the DC power supply 1 via the information line Lp. With. The main circuit 20 includes a microcomputer, and the microcomputer controls the operation of the DC device 2.

  The device communication unit 21 communicates with other devices using either identification information for individual communication (individual address) or identification information for broadcast communication (common address). In addition, the DC device 2 includes an information holding unit 22 that holds an index value of power used as electrical information during operation. The electrical information held by the information holding unit 22 is transmitted to the controller 10 of the DC power source 1 through the device communication unit 21. Notification is possible. As the index value serving as electrical information, at least one piece of information indicating power used during operation of the DC device 2 such as rated power, rated current, and maximum current is used.

  Since the electrical information held by the information holding unit 22 is information set by the manufacturer of the DC device 2 and is not changed during use of the DC device 2, the information holding unit 22 includes a mask ROM or a printout. A conductive pattern on the substrate may be used. However, it is also possible to use a non-volatile memory so that the manufacturer can easily set the electrical information.

  By the way, the timing of notifying the controller 10 of electrical information includes when it is requested from the DC power supply 10 and when it is requested from the DC device 2 to the DC power supply 1. The former is mainly the operation when the power source of the DC distribution system is turned on, and the latter is mainly the operation when the DC device 2 is added to the power supply line Lp.

  That is, when the DC power distribution system is turned on, by requesting acquisition of electrical information from the DC power supply 1, electrical information can be collected for all DC devices 2 connected to the power supply line Lp. At this time, the acquisition of electrical information is requested by broadcast communication, and the response from each DC device 2 is acquired. Further, when the DC device 2 is added, the added DC device 2 requests the DC power supply 1 to read electrical information and notifies the individual address, and the DC power source 1 uses the individual address to generate electricity from the corresponding DC device 2. Get information.

  The DC device 2 has a sleep mode in which only the device communication unit 21 operates and a normal mode in which the device communication unit 21 operates together with the main circuit 20. Switching between the sleep mode and the normal mode is performed using a switch element 23 comprising a relay or an electronic switch. That is, inside the DC device 2, as shown in FIG. 2, the device communication unit 21 is directly connected to the output of the internal power supply 24 to which power is supplied from the power supply line Lp. The output is connected via a switch element 23. If the switch element 23 is off, power is supplied only to the device communication unit 21, so that only the device communication unit 21 operates, and if the switch element 23 is on, the main circuit 20 and the device communication unit 21 is in a normal mode in which power is supplied. Whether the switch element 23 is on or off is determined by the device communication unit 21 in response to an instruction from the DC power supply 1.

  In the supply current setting unit 13 of the DC power supply 1 described above, a supply current value allowed for the power supply line Lp is registered or set. In addition, the supply current allowed for the power supply line Lp is regulated not only by the type of electric wire used for the power supply line Lp but also by rules regarding wiring. That is, the supply current value is defined by the configuration of the power supply line Lp (type of electric wire, form of wiring, allowable current value, etc.). By holding these pieces of information in the supply current setting unit 13, the maximum current that can be supplied to each of the power supply lines Lpa, Lpb, and Lpc can be defined. The supply current value may be determined in consideration of the supply capability defined by the maximum output current of the DC power supply 1.

  Now, assuming that the maximum supply current allowed for each power supply line Lpa, Lpb, Lpc is α and the total maximum output current of the power converter 1a and the distributed power source 1b is β, β ≧ α If so, each power supply line Lpa, Lpb, and Lpc can be supplied with current up to the maximum supply current α allowed for the power supply lines Lpa, Lpb, and Lpc, so the maximum current that can be supplied to each system is The power supply lines Lpa, Lpb, and Lpc are determined only by the specifications. On the other hand, if β <α, the maximum supply current α determined by the specification cannot be supplied to at least one power supply line Lpa, Lpb, Lpc. Accordingly, it is necessary to set the maximum supply current of the DC power supply 1 and the supply current allowed for the power supply line Lp in the supply current setting unit 13.

  Further, the required current calculation unit 14 of the DC power supply 1 acquires each current used by the DC device 2 that supplies DC power from the DC power supply 1 through communication between the power supply communication unit 11 and the device communication unit 21. It calculates based on the electrical information. Now, assuming that the total of the maximum currents required when all the DC devices 2 are operating exceeds the maximum supply current of the DC power source 1, the supply of the DC power source 1 is performed when all the DC devices 2 are operated simultaneously. Since the capacity is exceeded, there is a possibility of system down in this wiring design. Further, in any power supply line Lpa, Lpb, Lpc, the total of the maximum currents required when all the connected DC devices 2 operate exceeds the supply current allowed for the power supply line Lp. If so, the power supply line Lp may be overheated.

  Therefore, the required current calculation unit 14 uses the sum of currents used in all the DC devices 2 connected to the DC power supply 1 and the DC devices 2 connected to the power supply lines Lpa, Lpb, and Lpc of each system. The total current is calculated based on the electrical information of each DC device 2. Since the power communication unit 11 can also acquire electrical information for each DC device 2, the requested current calculation unit 14 can use not only the total but also individual currents for the current used by the DC device 2. It is.

  The permission determination unit 15 compares the supply current value set in the supply current setting unit 13 with the request current value calculated by the request current calculation unit 14, and determines that the direct current when the request current value is smaller than the supply current value. The use of the device 2 is permitted. Specifically, the maximum current that can be supplied by the DC power supply 1 is set as the supply current value, and the total of the maximum currents used by all the DC devices 2 to which the DC power supply 1 supplies DC power is set as the required current value. If the supply current value is equal to or greater than the required current value, the system will not be down even if all the DC devices 2 operate simultaneously. However, regarding the power supply lines Lpa, Lpb, and Lpc of each system, the sum of the maximum currents used in the connected DC devices 2 is used as the required current value, and the supply current allowed for the power supply lines Lpa, Lpb, and Lpc As the supply current value, confirm that the requested current value does not exceed the supply current value. When this condition is satisfied, the restrictions on the power supply lines Lpa, Lpb, and Lpc can be observed and overheating can be prevented.

  The supply current value is the maximum current supplied by the DC power supply 1 and the maximum current allowed for the power supply lines Lpa, Lpb, and Lpc of each system, but the required current value is all the DC devices 2 used in the DC distribution system. Instead of using the sum of the maximum currents used by the power supply line and the sum of the maximum currents used by the DC devices 2 in each system of the power supply lines Lpa, Lpb, Lpc, etc. It is also possible to use the total (whole system and system) as the required current value. When this required current value is used, electrical information is notified to the DC power supply 1 immediately before each DC device 2 operates.

  By the way, when the permission determination unit 15 determines that the required current value exceeds the supply current value, the control unit 12 of the controller 10 provided in the DC power supply 1 performs at least one of the following operations. That is, the first operation is an operation for reducing the current used in the DC device 2 by communicating with the DC device 2 through the power communication unit 11. As described above, the DC device 2 includes the sleep mode and the normal mode. Therefore, an increase in current used in the DC device 2 is prevented by maintaining the sleep mode and not shifting to the normal mode. That is, the DC power source 1 communicates when the DC device 2 is in the sleep mode, and shifts to the normal mode when the requested current value does not exceed the supply current value. With this operation, the operation of the operating DC device 2 can be maintained.

  The second operation is an operation for stopping the supply of DC power to the power supply line Lp. In the configuration of FIG. 1, the supply of DC power cannot be stopped for each system. It will be stopped. When the supply of DC power from the DC power source 1 to the DC device 2 is stopped, the DC device 2 does not operate. This operation is performed when the DC power distribution system is turned on and there is no DC device 2 in operation. Can be selected. If such an operation is performed, when the required current value exceeds the supply current value, the supply of DC power is interrupted in advance before the operation of the DC device 2, so that the DC power supply 1 breaks down or the power supply line It is possible to reliably prevent Lp from overheating. In addition, once communication between the DC power source 1 and the DC device 2 is established, the operation is stopped without supplying DC power to the DC device 2, so that the user exceeds the supply current value. Therefore, it is possible to change the design of the DC power source 1 or the DC device 2 to be used.

  In the third operation, the DC power supply 1 or the DC device 2 is provided with a notification unit 17 provided with a display or a notification device that generates a notification sound, and the notification of the inability to use is made through the notification unit 17. In this operation, since the user knows that the required current value exceeds the supply current value by the notification in the notification unit 17, the design can be corrected immediately after the DC power distribution system is constructed, When the DC device 2 is in use, it is possible to operate the desired DC device 2 by removing the unnecessary DC device 2 from the power supply line Lp or stopping the operation of the unnecessary DC device 2. become.

  The first operation, the second operation, and the third operation can be used in appropriate combination. For example, if the third operation is notified when the supply of DC power is stopped as in the second operation, the user can know the reason why the DC power is not supplied and the convenience is enhanced. In this case, it is necessary to separately secure power for the notification unit 17.

  The operation will be briefly described below with reference to FIG. FIG. 3A shows the operation when the power is turned on immediately after the DC power supply line Lp is connected and the DC power supply 1 is connected to the power supply line Lp to construct the DC power distribution system. The DC power source 1 is turned on (S1), and the supply current value is set in the supply current setting unit 13 (S2). Next, the DC power supply 1 acquires electrical information held by each DC device 2 by broadcast communication (S3). If the information filter 3 is appropriately controlled as will be described later, the electrical information of the DC device 2 can be acquired for each system of the power supply lines Lpa, Lpb, Lpc, or all the DC devices 2 connected to the DC power source 1 can be obtained. It is possible to obtain electrical information all at once. In step S2, the electrical information of all the DC devices 2 that supply DC power from the DC power source 1 is acquired regardless of whether the system is different. Based on the acquired electrical information, the required current calculation unit 14 calculates a required current value (S4).

  Next, the permission determination unit 15 compares the request current value calculated by the request current calculation unit 14 with the supply current value set in the supply current setting unit 13 (S5), and the request current value determines the supply current value. If not, the control unit 12 instructs each DC device 2 to shift to the normal mode through the power communication unit 11 (S6). On the other hand, when the required current value exceeds the supply current value, notification is made (S7), and the supply of DC power is stopped (S8).

  FIG. 3B shows an operation when a new DC device 2 is added to the power supply line Lp after the DC power distribution system is constructed. The DC device 2 is connected to the power supply line Lp, and the DC device 2 notifies the DC power source 1 of connection and notifies the individual address (S1). This notification is started by operating a switch such as a reset switch provided in the DC device 2. Note that it is conceivable that when the DC device 2 is connected to the power supply line Lp, a connection notification is automatically started by supplying power to the device communication unit 21. Since the connection notification and the individual address notification are simultaneously made from the DC device 2 to the DC power supply 1 when the power is turned on, the collision avoidance process becomes complicated, so it is not adopted here.

  Next, in response to the connection notification, the DC power source 1 requests the DC device 2 to acquire electrical information using the individual address (S2), and the DC device 2 notifies the DC power source 1 of the electrical information ( S3). The required current calculation unit 14 of the DC power supply 1 recalculates the required current value using the acquired electrical information and the electrical information already acquired when the power is turned on (S4), and passes it to the permission determination unit 15. The permission determination unit 15 compares the requested current value with the supplied current value in the same manner as when the power is turned on (S5), and if the requested current value does not exceed the supplied current value, the newly connected DC device 2 is connected. Transition to the normal mode (S6). On the other hand, when the requested current value exceeds the supply current value, the newly connected DC device 2 is not shifted to the normal mode, and the capacity excess is notified by the notification unit 17 (S7).

  Incidentally, the additional concept of the DC device 2 as shown in FIG. 3B may include a case where the DC device 2 is newly operated. In this case, even if the required current value exceeds the supply current value when the power is turned on, if the required current value related to the required DC device 2 registered in advance does not exceed the supply current value, the DC device 2 is Select and move to normal mode. For example, a DC device 2 that does not have a dormant mode is used, a DC device 2 that is configured so that the normal mode is selected instead of the dormant mode when connected to the power supply line Lp, the required current amount and the supply current Regardless of the amount, the DC device 2 holding the electrical information for requesting the normal mode in the information holding unit 22 is used. However, if the required current value exceeds the supply current value even in the operation of this type of DC device 2 alone, the supply of DC power is stopped as shown in FIG.

  On the other hand, as described above, the total of all DC devices 2 and the total of DC devices 2 by system are cases where the required current value exceeds the supply current value, and some of the registered DC devices 2 are in the normal mode. In this case, when another DC device 2 is to be operated, the DC device 2 to be operated notifies the DC power supply 1 of the start of operation. This operation is the same operation as the connection notification when the new DC device 2 is connected to the power supply line Lp. When there are a plurality of DC devices 2 that operate in a coordinated manner, such as switches and loads, the DC power supply 1 responds to all the DC devices 2 that operate in a coordinated manner in response to a request for operation start from one DC device 2. Request the acquisition of electrical information. The subsequent operation is the same as the operation of FIG. 3B, the required current value is calculated using the acquired electrical information of the DC device 2, the required current value is compared with the supply current value, and the DC device 2 is compared. Determines whether to shift to the normal mode.

  When this operation is performed, the required current amount does not exceed the supplied current amount even if the DC device 2 having the maximum operating power is operated among the DC devices 2 excluding the registered DC devices 2. In addition, it is necessary to design the DC power supply 1 and the wiring. Whether or not such a wiring design is made can be determined by the permission determining unit 15 simply by changing data for calculating the required current value in the required current calculating unit 14. In the above-described operation example, the maximum power during the operation of the DC device 2 (the voltage applied to the power supply line Lp is known in the DC power supply 1 and is equivalent to the maximum current in practice) or the maximum current is used. Although it is assumed that the required current value is calculated, it is possible to use a rated value instead of the maximum value. However, if the required current value is calculated using the rated value, even if the required current value does not exceed the supplied current value in the calculation, the required current value may exceed the supplied current value during operation. It is desirable to provide a protection circuit for limiting the output current in the DC power supply 1 (power converter 1a).

  As for the control of the information filter 3, when acquiring electrical information from the DC device 2 for each power supply line Lpa, Lpb, Lpc, the information filter 3 inserted in each power supply line Lpa, Lpb, Lpc is used. The remaining information filters 3 may be blocked one by one as a pass state. Alternatively, it is possible to start from a state where all the information filters 3 of each system are passed or blocked, and to reduce the number of information filters 3 that are passed or blocked one by one. By operating the information filter 3 as described above, it is possible to acquire the electrical information of all the DC devices 2 while performing only the broadcast communication, and to acquire the electrical information of the DC devices 2 for each system. Is possible. Needless to say, the electrical information of the DC devices 2 for each system can also be acquired by the latter operation, for example, after the electrical information of the two systems of DC devices 2 is acquired. This is because the electrical information of the other one-system DC device 2 out of the two systems can be acquired by the difference between them.

  By the way, as can be seen from the above-described operation, it is prevented that the required current value exceeds the supply current value during the operation of the DC device 2, so the request current value exceeds the supply current value during the operation of the DC device 2. In this case, it can be determined that the abnormality is related to the power supply line Lp or the DC device 2 is operating abnormally. Therefore, a current sensor (a so-called DC CT combining a Hall element and a magnetic core) or a current detection resistor is disposed at an appropriate position on the power supply line Lp to monitor the current flowing through the power supply line Lp. If the measured current exceeds the supply current value, it is desirable to determine that an abnormality such as a short circuit has occurred in the power supply line Lp or the DC device 2 and to stop the DC power supply 1.

It is a block diagram which shows embodiment. It is a principal part block diagram of the direct current | flow apparatus used for the same as the above. It is operation | movement explanatory drawing same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 DC power supply 2 DC equipment 3 Information filter 10 Controller 11 Power supply communication part 12 Control part 13 Supply current setting part 14 Request current calculation part 15 Permission judgment part 16 Selection part 17 Notification part 20 Main circuit 21 Equipment communication part 22 Information holding part 23 Switch element 24 Internal power supply Lp Power supply line Lpa Power supply line Lpb Power supply line Lpc Power supply line Ls Information line Lsa Information line Lsb Information line Lsc Information line

Claims (11)

A DC power source that outputs DC power and a DC device that is driven by DC power supplied from the DC power source via a power supply line. The DC device includes a main circuit as a functional unit and power used during operation. An information holding unit that holds the index value of the information as electrical information, a device communication unit that transmits the electrical information held by the information holding unit to a DC power source, and a state in which power from the power supply line is supplied only to the device communication unit A power supply communication that includes a switch element that switches between a device communication unit and a state to be supplied to the main circuit, and a DC power supply communicates with a DC device connected to a power supply line that supplies DC power to acquire electrical information. Required for the power supply line based on the index value acquired by the power supply communication unit A request current calculator for obtaining the determined current value, compares the supplied current value and the required current value in a state in which power is supplied only to the device communication unit, the DC device when the request current value does not exceed the supply current value A DC power distribution system comprising: a permission determining unit that permits use and switches a switch element to supply power to a device communication unit and a main circuit .   A plurality of the DC devices are provided, and the required current calculation unit sums the index values acquired from the device communication units of the DC devices, and calculates a required current value required for the power supply line. The DC power distribution system according to claim 1.   3. The direct current according to claim 1, wherein communication between the device communication unit and the power supply communication unit transmits information using a high-frequency carrier wave using the power supply line as a communication path. Power distribution system.   The power supply line is branched into a plurality of systems, and each system includes an information filter for selecting passage and blocking of a carrier wave that transmits information between the device communication unit and the power communication unit. 4. The DC power distribution system according to claim 3, wherein   A selection unit that selects passage and blocking of a carrier wave for each information filter, and the request current calculation unit selects a request current value for each power supply line by causing the selection unit to select an information filter that passes the carrier wave. The DC power distribution system according to claim 4, wherein the DC power distribution system is obtained.   5. The required current calculation unit obtains a required current value for each power supply line of each system based on a total of index values obtained from the DC devices for each system of the power supply line. Or the DC distribution system of Claim 5.   The DC power supply reduces the current used in the DC equipment by communicating with the DC equipment through the power supply communication section when the required current value exceeds the supply current value in the comparison result in the permission determination section. The DC power distribution system according to any one of claims 1 to 6, further comprising a control unit.   The DC power supply is provided with a control unit for stopping the supply of DC power to the power supply line when the required current value exceeds the supply current value in the comparison result in the permission determination unit. The DC power distribution system according to any one of claims 1 to 6, wherein:   The DC power supply is provided with a control unit for notifying the uselessness through a notification unit when a required current value exceeds a supply current value in a comparison result in the permission determination unit. The DC power distribution system according to any one of claims 1 to 6.   The DC device has a sleep mode in which only the device communication unit operates, and a normal mode in which the device communication unit operates with a main circuit, the DC device communicates with the DC power supply in the sleep mode, and the permission determination unit The direct current distribution system according to any one of claims 1 to 9, wherein when the required current value does not exceed the supply current value in the comparison result in (1), the mode is shifted to the normal mode.   The request current calculation unit acquires an index value from a DC device at least one of when a DC power supply is turned on and when the DC device is added, and causes the permission determination unit to determine whether the DC device can be used. The DC power distribution system according to any one of claims 1 to 10.

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