JP2012248330A - Power distribution device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power distribution device capable of reducing possibility of generation of such power supply that exceeds the rating while preventing simultaneous interruption of power supply to all devices.SOLUTION: A power distribution device 20 has: a plurality of output receptacles 21 to which a power received at an input receptacle 22 is supplied; a current detection transformer 29 detecting currents flowing through the output receptacles 21 respectively; a plurality of relays 24 configuring a power supply path to the output receptacles 21 in a driving state, and blocking the power supply path in a non-driving state; a field-effect transistor 28 driving the relays 24; and a control device 27 controlling the field-effect transistor 28. The control device 27 performs non-driving control of the relay 24 corresponding to any one of the output receptacles 21 that supplies a power to a load device 30 in the case that it is determined that a total supplied power of all output receptacles 21 exceeds a permissible value.

Description

  The present invention relates to a power distribution device that distributes power to devices.

  With the development of information communication technology, for example, in information communication facilities such as IDS (Internet Data Center) where various computers (mainframes, servers, etc.) and data communication devices are installed and operated, the amount of power required Increasingly, the suppression of power consumption is an issue. In general, an AC power feeding system is adopted as a system for feeding power to each device in an information communication facility. In the AC power supply system, first, commercial AC power is converted to DC power, and charged to a UPS (uninterruptible power supply system) battery of information communication equipment. The DC power is converted to AC power of AC 100 to 200 V and distributed to each device. Each device converts the distributed AC power into DC power, and further converts the DC power into DC power having a desired voltage. That is, in the AC power supply system, since power conversion is required four times in total, there is a problem that power loss due to power conversion is large.

  In recent years, in order to reduce power consumption in information communication facilities, a direct current power supply system using high voltage direct current power supply (HVDC) technology has been attracting attention. Since the DC power supply system converts commercial AC power to DC power and then distributes the DC power to each device as it is, the number of power conversions is only two. That is, since the DC power supply system can reduce the number of times of power conversion compared to the AC power supply system, the loss during power conversion can be reduced and the power utilization efficiency can be improved (for example, Patent Documents). 1).

JP 2010-118173 A

  In the above power supply system, a power distribution unit (PDU) that distributes power to each device is used. In general, a power distribution device is provided with a plurality of receptacles (distribution units) that distribute received power to a plurality of devices. Each device is supplied with power from the power distribution device by connecting the plug of the power cable to the receptacle of the power distribution device.

  Since the conventional power distribution device does not include a means for avoiding power supply exceeding the rated value in the specification, there is a possibility that abnormal heat generation or the like due to power supply exceeding the rated value may occur. In this case, for example, if a breaker or the like (wiring breaker) is provided on the power receiving side of the power distribution device, power supply exceeding the rating of the power distribution device can be avoided. However, if a breaker or the like (wiring breaker) is provided on the power receiving side of the power distribution device, when power supply exceeding the rating of the power distribution device occurs, the power supply to all devices will be cut off at the same time. Therefore, a problem arises in terms of convenience.

  In view of such circumstances, the present invention has been made, and the purpose of the present invention is to provide power supply exceeding the rating without causing a situation in which the power supply to all the devices is interrupted all at once in the power distribution device. This is to reduce the risk of occurrence.

<First Aspect of the Present Invention>
According to a first aspect of the present invention, a power receiving unit that receives power, a plurality of power distribution units to which the power received by the power receiving unit is supplied, and a current detection circuit that detects currents flowing through the plurality of power distribution units, respectively A plurality of relays provided corresponding to each of the power distribution units, configured to drive a power supply path for the power received by the power reception unit to the power distribution unit and shut off in a non-drive state, and to each of the relays A plurality of relay drive circuits that are provided correspondingly and that drive the relay; and a control device that controls the relay drive circuit. The control device supplies power from the power distribution unit to the device. Means for detecting for each power distribution unit based on the current flowing through the power supply, and determining whether or not the sum of the power supplied to all the power distribution units exceeds an allowable value, and the sum of the power supplied to all the power distribution units is When it is judged that the allowable value is exceeded Includes a means for non-driving and controlling the relay corresponding to one of the power distribution unit that supplies power to the equipment, it is a power distribution apparatus characterized.

  Here, the allowable value is a threshold value determined from the viewpoint of reducing the possibility of power supply exceeding the rated power specified in the specification of the power distribution device, for example, the value of the rated power in the specification of the power distribution device or based on this It is a fixed value determined by

  The sum of the power supplied to all the power distribution units can be obtained by obtaining the power supplied to each power distribution unit from the product of the voltage of the received power and the current flowing through the power distribution unit, and adding them together. And when it determines with the total of the electric power supplied of all the power distribution parts exceeding an allowable value, a control apparatus carries out non-drive control of the relay corresponding to one of the power distribution parts which is supplying electric power to an apparatus. As a result, only the power supply from one of the power distribution units to the device is cut off, so that the power supply of all the power distribution units can be maintained while continuing the power supply of the devices connected to the other power distribution units. The sum can be reduced. Therefore, it is possible to maintain a state in which the sum of the power supplied from all the power distribution units does not exceed the allowable value without causing a situation where the power supply to all the devices is interrupted all at once.

  As a result, according to the first aspect of the present invention, in the power distribution apparatus, the possibility that the power supply exceeding the rating will occur without causing the situation where the power supply to all the devices is interrupted all at once is reduced. The effect of being able to be obtained is obtained.

<Second Aspect of the Present Invention>
According to a second aspect of the present invention, in the first aspect of the present invention described above, the control device periodically determines whether or not a total sum of power supplied to all the power distribution units exceeds an allowable value. This is a power distribution device characterized by that.

  According to the second aspect of the present invention, it is periodically determined whether or not the sum of the power supplied to all the distribution units exceeds the allowable value, and the sum of the power supplied to all the power distribution units has the allowable value. Since the state which does not exceed is maintained, the possibility of power supply exceeding the rating can be continuously reduced.

<Third Aspect of the Present Invention>
According to a third aspect of the present invention, in the first aspect or the second aspect of the present invention described above, the control device detects the start of power supply to the device in any of the power distribution units. If it is determined whether the sum of the power supplied to all the power distribution units exceeds an allowable value, and if the sum of the power supplied to all the power distribution units exceeds the allowable value, The power distribution device is characterized in that the relay corresponding to the power distribution unit that has detected the start of power supply to the non-drive is controlled.

  When the control device detects the start of power supply to the device in any of the power distribution units, the control device determines whether or not the sum of the power supplied to all the power distribution units exceeds an allowable value. That is, it is determined whether or not the sum of the power supplied to all the power distribution units exceeds the allowable value due to the start of power supply to the device in any power distribution unit.

  Here, the start of power supply to a device corresponds to a case where power supply from the power distribution unit to the device is started, for example, when the device is connected to the power distribution unit, and is connected to the power distribution unit, for example. This corresponds to the case where the power supply from the power distribution unit to the device is started by turning on the power switch of the device.

  If it is determined that the sum of the power supplied from all the power distribution units exceeds the allowable value, the relay corresponding to the power distribution unit that detected the start of power supply to the device is non-driven. As a result, only the power supply from the power distribution unit to the device is cut off, so that it is connected to another power distribution unit while avoiding a state where the sum of the power supplied by all the power distribution units exceeds the allowable value. The power supply to the device can be continued as it is. That is, it is possible to reduce the possibility of power supply exceeding the rating occurring without affecting the devices that are already operating with power supplied from the power distribution device.

<Fourth aspect of the present invention>
A fourth aspect of the present invention is the power distribution unit according to any one of the first to third aspects of the present invention described above, wherein the control device does not detect power supply to the device. The power distribution device further includes means for maintaining non-drive control of the relay corresponding to the above and periodically controlling the relay for a predetermined time.
According to such a feature, the power distribution unit that has not detected the power supply to the device is maintained in a state where the power supply from the power reception unit is cut off. For example, the power distribution unit to which no device is connected is connected to the human body. It is possible to reduce the possibility of accidents such as electric shock due to contact with tools and tools. In addition, by connecting and controlling the relay corresponding to the power distribution unit in a state where the power supply from the power reception unit is interrupted periodically for a certain period of time, whether or not current flows at that time, the connection of the device to the power distribution unit Can be detected. Therefore, when a device is connected to a power distribution unit in a state where power supply from the power reception unit is interrupted, power supply from the power reception unit to the power distribution unit can be started and maintained.

<Fifth aspect of the present invention>
According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention described above, the communication device further includes a communication device having a communication interface function between the external device and the control device. It is a power distribution device.
According to such a feature, in addition to the operational effects of any of the first to fourth aspects of the present invention described above, the power supply from each power distribution unit to each device can be individually performed by remote control from an external device. It becomes possible to control.

<Sixth aspect of the present invention>
According to a sixth aspect of the present invention, in the fifth aspect of the present invention described above, the control device performs drive control of the plurality of relays with a time difference on condition that all the relay drive requests are received from the external device. The power distribution device further includes means for sequentially executing the power distribution device.

  When receiving an all-relay drive request from an external device and starting power supply to a device connected to a power distribution unit, immediately after the start of power supply, a large amount of power consumption due to an inrush current to the device occurs instantaneously. There is. For this reason, if a plurality of relays are simultaneously driven and power supply to a plurality of devices is started at the same time, extremely large power consumption may occur instantaneously. For example, a power supply device that supplies power to a power receiving unit (commercially available) There is a risk that a power converter that converts AC power into DC power will be stopped by an overcurrent protection function or the like.

  In the sixth aspect of the present invention, when all relay drive requests are received from the external device and power supply to the equipment connected to the power distribution unit is started, the drive control of the plurality of relays is sequentially executed with a time difference. Therefore, it is possible to prevent an extremely large amount of power consumption from occurring instantaneously. Therefore, according to the sixth aspect of the present invention, for example, the possibility that the power supply device that supplies power to the power receiving unit of the power distribution device may stop due to the overcurrent protection function or the like can be reduced. It is possible to reduce the possibility that the power supply to all the devices is interrupted all at once.

<Seventh aspect of the present invention>
According to a seventh aspect of the present invention, in any one of the first to sixth aspects of the present invention described above, the second direct current power of the first direct current voltage received by the power receiving unit is lower than the first direct current voltage. The power distribution device further includes a DC voltage conversion device for converting to a DC voltage, wherein the relay drive circuit drives the relay with a second DC voltage output from the DC voltage conversion device.

  When a device plug is removed from a power distribution unit in a DC power supply system, the relay corresponding to that power distribution unit is controlled to be non-driven and the supply of DC power to the power distribution unit is cut off. It is possible to prevent an arc from occurring continuously between the power distribution unit and the power distribution unit. Then, a DC voltage converter that converts the received DC power voltage into a second DC voltage lower than the first DC voltage is provided, and the relay is driven by the second DC voltage. It is possible to reduce the risk of arcing.

  Thus, according to the seventh aspect of the present invention, in the DC power supply system, it is possible to provide a power distribution device that is less likely to generate an arc continuously when the plug of the device is removed from the power distribution unit.

<Eighth aspect of the present invention>
According to an eighth aspect of the present invention, in the seventh aspect of the present invention described above, the relay drive circuit causes the relay to be in a non-driven state by a manual operation regardless of drive control of the relay by the control device. The power distribution device further includes a switch.
According to the eighth aspect of the present invention, when the plug of the device is removed from the power distribution unit, the switch corresponding to the power distribution unit is operated and the relay corresponding to the power distribution unit is set in a non-driven state. Thus, it is possible to prevent an arc from being continuously generated between the plug of the device and the power distribution unit.

<Ninth aspect of the present invention>
According to a ninth aspect of the present invention, in the seventh aspect or the eighth aspect of the present invention described above, the relay drive circuit further includes an indicator lamp that lights when the relay is in a drive state. This is a featured power distribution device.
An operator who inserts / removes a device plug into / from a power distribution unit uses an indicator lamp to indicate whether the relay corresponding to the power distribution unit is in a driving state, i.e., whether the power distribution unit is supplied with DC power from the power receiving unit. It can be recognized visually. Therefore, according to the ninth aspect of the present invention, it is possible to reduce the possibility that the operator mistakenly removes the plug of the device from the power distribution unit to which DC power is supplied.

  According to the present invention, in the power distribution device, there is an effect that it is possible to reduce the possibility that the power supply exceeding the rating occurs without causing the situation where the power supply to all the devices is interrupted all at once. It is done.

1 is a schematic configuration diagram of a DC power supply system. FIG. 3 is a plan view of the power distribution device in a state where the cover is removed and the inside is visible. The front view of an electric power distribution apparatus. The circuit diagram of a power distribution device. The flowchart which illustrated the 1st Example of the power distribution control procedure by a control apparatus. The flowchart which illustrated 2nd Example of the power distribution control procedure by a control apparatus. The flowchart which illustrated the 3rd Example of the power distribution control procedure by a control apparatus. The flowchart which showed the 4th Example of the power distribution control procedure by a control apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, this invention is not specifically limited to the Example demonstrated below, It cannot be overemphasized that a various deformation | transformation is possible within the range of the invention described in the claim.

<DC power supply system>
A configuration of a DC power supply system 100 as an example of a power supply system will be described with reference to FIG.
FIG. 1 is a schematic configuration diagram of a DC power supply system 100.

  The DC power supply system 100 is a power supply system installed in an information communication facility such as IDS in which various computers (mainframe, server, etc.) and data communication devices are installed and operated. The DC power supply system 100 includes a power supply system 10, a power distribution unit (PDU) 20, and a plurality of load devices 30.

The power supply system 10 includes an AC / DC converter 11, a charger 12, a battery 13, and a DC-DC converter 14.
The AC / DC converter 11 is a power converter that converts AC 200V commercial AC power into DC 250V to 400V DC power. The DC power output from the AC / DC converter 11 is output to the power distribution device 20 and also to the charger 12. The charger 12 charges the battery 13 with a part of the DC power output from the AC / DC converter 11. The power charged in the battery 13 is output to the power distribution device 20 via the DC-DC converter 14 when, for example, a commercial AC power is interrupted. The DC-DC converter 14 converts the output voltage of the battery 13 to DC 250V to 400V and outputs it to the power distribution device 20.

  The power distribution device 20 includes a plurality of output receptacles 21, and distributes DC 250 V to 400 V DC power received from the power supply system 10 to the plurality of load devices 30 via the plurality of output receptacles 21. The configuration of the power distribution device 20 will be described later.

  The load device 30 is an information communication device such as a mainframe or a server, for example. The load device 30 includes a power cable 32 and a DC-DC converter 33 provided with a plug 31 at the tip. In the load device 30, the plug 31 is fitted to the output receptacle 21 of the power distribution device 20, whereby DC power of DC 250V to 400V is supplied to the DC-DC converter 33 via the power cable 32. The DC-DC converter 33 converts the DC power of DC 250V to 400V distributed from the power distribution device 20 into a DC voltage (for example, DC 48V) corresponding to the load device 30. The load device 30 operates with a DC voltage output from the DC-DC converter 33.

<Power distribution unit (PDU)>
The configuration of the power distribution device 20 according to the present invention will be described with reference to FIGS.
FIG. 2 is a plan view of the power distribution device 20 with the cover removed and the inside visible. FIG. 3 is a front view of the power distribution device 20. FIG. 4 is a circuit diagram of the power distribution device 20.

  The power distribution device 20 includes a plurality of output receptacles 21, an input receptacle 22, a DC-DC converter 23, a plurality of relays 24, a plurality of switches 25, and a plurality of LED indicator lamps 26, which are accommodated in the housing 2. Has been configured.

  The output receptacle 21 serving as a “distribution unit” distributes DC 250V to 400V DC power output from the power supply system 10 to the load device 30, and the opening portion into which the plug 31 of the load device 30 is fitted is the housing 2. It is arrange | positioned in the state exposed to the front of. The input receptacle 22 as a “power receiving unit” receives DC power of DC 250 V to 400 V output from the power supply system 10. The DC power received by the input receptacle 22 is supplied to the plurality of output receptacles 21. The DC-DC converter 23 as the “DC voltage converter” converts the DC power voltage (first DC voltage) of DC 250V to 400V received by the input receptacle 22 to a lower voltage, for example, DC 12V (second DC voltage). Convert.

  A plurality of relays 24 are provided corresponding to the plurality of output receptacles 21 respectively. The relay 24 includes two drive coils L1 and L2 connected in series and two independent contacts SS1 and SS2. The contact SS1 is connected in series on the + side of the DC power supply path to the output receptacle 21. The contact SS2 is connected in series to the negative side (GND side) of the DC power supply path to the output receptacle 21. That is, the relay 24 is provided so that the supply of DC power of DC 250V to 400V received by the input receptacle 22 to the output receptacle 21 can be turned on / off at the contacts SS1 and SS2.

  In a non-driving state in which no DC voltage is applied to the two driving coils L1 and L2, the relay 24 is in a state where the two contacts SS1 and SS2 are opened and turned off. The relay 24 is driven by applying a DC12V DC voltage output from the DC-DC converter 23 to the two drive coils L1 and L2, whereby the two contacts SS1 and SS2 are closed and turned on. . This relay 24 is a known direct current high-voltage having a mechanism for extinguishing the arc generated at the contacts SS1 and SS2 from the viewpoint of reducing the possibility that an arc is generated at the contacts SS1 and SS2 and the contacts SS1 and SS2 are damaged. A voltage relay is preferably used.

  A plurality of switches 25 constituting the “relay drive circuit” are provided corresponding to each of the plurality of relays 24, and are disposed so as to be manually operable while being exposed on the front surface of the housing 2. The switch 25 is connected in series between the drive coil L <b> 2 of the relay 24 and the GND terminal of the DC-DC converter 23. Application of the output voltage of the DC-DC converter 23 (second DC voltage: for example, DC 12 V) to the relay 24 can be turned ON / OFF by operating the switch 25. That is, by operating the switch 25, the relay 24 can be turned ON / OFF, and thereby the supply of DC power to the output receptacle 21 can be turned ON / OFF.

  A plurality of LED indicator lamps 26 as “indicator lamps” are provided corresponding to the plurality of switches 25, respectively, and are arranged so that the lighting state can be seen from the front side while being exposed on the front side of the housing 2. Yes. The LED indicator lamp 26 includes an LED (light emitting diode), the anode terminal of the LED is connected to the + side of the output terminal of the DC-DC converter 23, and the cathode terminal of the LED is connected to the drive coil L <b> 2 of the relay 24. . That is, the LED indicator lamp 26 is lit when the switch 25 is turned on and the relay 24 is in a driving state (ON state). Therefore, the operator who inserts / removes the plug 31 of the load device 30 with respect to the output receptacle 21 indicates whether or not the relay 24 is driven, that is, whether or not DC 250V to 400V DC power is being supplied to the output receptacle 21. The light 26 can be visually recognized with certainty.

  In the power distribution device 20 according to the present invention having such a configuration, when the plug 31 of the load device 30 is removed from the output receptacle 21, the relay 24 is turned off by operating the switch 25, and the direct current power to the output receptacle 21 is This is done with the supply of power cut off. As a result, it is possible to prevent an arc from being continuously generated between the output receptacle 21 and the plug 31. The power distribution apparatus 20 according to the present invention converts a DC power voltage (first DC voltage) of DC 250 V to 400 V received from the power supply system 10 into a lower DC 12 V (second DC voltage), for example, a DC-DC converter 23. The relay 24 is driven with the low voltage. As a result, it is possible to reduce the possibility of an arc being continuously generated by the switch 25 that turns the relay 24 ON / OFF.

  The power distribution device 20 according to the present invention further includes a control device 27, a field effect transistor (FET) 28, and a current detection transformer (current transformer) 29, which are housed in the housing 2. .

  The control device 27 is a so-called microcomputer control device or PLC (Programmable Logic Controller), a CPU (Central Processing Unit) 271, a relay driver 272, a communication interface 273, and a current detection unit 274. including.

  The CPU 271 executes a control program stored in advance in a ROM (not shown) or the like. The relay driver 272 is a circuit that turns on / off the field effect transistor 28 to turn on / off the relay 24. The communication interface 273 as a “communication device” includes, for example, a serial interface such as RS232C, a wired LAN using Ethernet (registered trademark) and TCP / IP protocol, a wireless LAN compliant with the IEEE 802.11 standard, ADSL, an optical communication line, and the like. Thus, a communication interface function between the external device 40 and the power distribution device 20 control device 27 at a remote location is realized. The current detection unit 274 receives the output signal of the current detection transformer 29.

  A plurality of field effect transistors 28 constituting the “relay drive circuit” are provided corresponding to each of the plurality of relays 24, and are connected in series between the drive coil L <b> 2 of the relay 24 and the switch 25. More specifically, the field effect transistor 28 has a drain terminal connected to the drive coil L <b> 2 of the relay 24, a source terminal connected to the switch 25, and a gate terminal connected to the relay driver 272. Application of the output voltage (for example, DC 12 V) of the DC-DC converter 23 to the relay 24 is performed by ON / OFF control of the field effect transistor 28 when the switch 25 is in an ON state (a state where the contact of the switch 25 is configured). Can be turned ON / OFF. That is, when the switch 25 is in the ON state, the relay 24 can be turned on / off by controlling the field effect transistor 28 to be turned on / off, thereby turning on / off the supply of DC power to the output receptacle 21. can do. Instead of this, for example, a bipolar transistor, an electromagnetic relay, a solid state relay or the like may be used as the field effect transistor 28.

  A plurality of current detection transformers 29 as “current detection circuits” are provided corresponding to the plurality of output receptacles 21 respectively, and are provided in series with the wiring between the contact SS1 of the relay 24 and the + terminal of the output receptacle 21. The current flowing through the output receptacle 21 is detected. This “current detection circuit” may use, for example, a shunt resistor instead of the current detection transformer 29.

  The power distribution device 20 according to the present invention having such a configuration is provided with the field effect transistor 28 that drives the relay 24 that can turn on / off the power supply to the output receptacle 21, and further controls the relay drive circuit. By providing the control device 27, it is possible to automatically control ON / OFF of power supply to the output receptacle 21 according to various conditions. Therefore, according to the power distribution device 20 according to the present invention, the power distribution to the load device 30 can be automatically ON / OFF controlled according to various conditions.

  Further, although not an essential component of the present invention, the power distribution device 20 according to the present invention preferably includes the communication interface 273 in the control device 27 as described above. Accordingly, it is possible to control power distribution to the load device 30 by remote control from the external device 40.

Furthermore, the control device 27 executes, for example, the following control by a control program executed by the CPU 271.
The control device 27 sequentially executes drive control of the plurality of relays 24 (control to turn on the relays 24) with a time difference on the condition that, for example, all relay drive requests have been received from the external device 40. More specifically, when the CPU 271 receives all relay drive requests from the external device 40 via the communication interface 273, the control device 27 does not drive all the relays 24 at the same time, for example, for 2 to 3 seconds. The drive control of the plurality of relays 24 is sequentially executed at intervals. Thereby, the timing at which the inrush current flows through the output receptacle 21 when the relay 24 is ON can be shifted among the plurality of output receptacles 21. That is, it is possible to prevent an inrush current from flowing through the plurality of output receptacles 21 simultaneously. As a result, it is possible to prevent an extremely large amount of power consumption from occurring instantaneously. Therefore, for example, it is possible to reduce the possibility that the power supply system 10 that supplies power to the input receptacle 22 will be stopped by an overcurrent protection function or the like, and as a result, the power supply to all the load devices 30 is simultaneously cut off. It is possible to reduce the risk of being done.
Although the above time difference can be set to an arbitrary time, an inrush current flows through the output receptacle 21 when the relay 24 is turned on from the viewpoint of preventing an extremely large amount of power consumption from occurring instantaneously. It is preferable to set the time in consideration, for example, it is more preferable to set the time longer than the time during which the inrush current flows in the output receptacle 21 when the relay 24 is ON.

<First embodiment of power distribution control>
A first embodiment of power distribution control by the control device 27 will be described with reference to FIG.
FIG. 5 is a flowchart illustrating a first embodiment of a power distribution control procedure by the control device 27.

  The procedure illustrated in the flowchart is a procedure that is repeatedly executed at regular intervals. Hereinafter, the number of output receptacles 21 and relays 24 provided in the power distribution device 20 is assumed to be N, and the output receptacles 21 and the corresponding relays 24 are assigned numbers 1 to N, respectively. The same applies to other embodiments of the wiring control procedure described later.

  First, the integrated value held in the control device 27 is reset (integrated value = 0) (step S1). Here, the integrated value is a value obtained by detecting the power supplied from the output receptacle 21 to the load device 30 for each output receptacle 21 and integrating the detected power. The power supplied from the output receptacle 21 to the load device 30 can be obtained by multiplying the voltage of DC power (DC 250V to 400V) received by the input receptacle 22 by the current flowing through the output receptacle 21.

  Subsequently, the count value n held in the control device 27 is set to an initial value (n = 1) (step S2). This count value n corresponds to the number assigned to the output receptacle 21 and the corresponding relay 24.

  Subsequently, it is determined whether or not the relay 24 (relay (n)) having the number corresponding to the count value n is in operation (step S3). That is, it is determined whether power is being supplied from the output receptacle 21 having the number corresponding to the count value n to the load device 30. Whether or not the relay 24 having the number corresponding to the count value n is in operation can be specified by the control state of the relay 24 or whether or not a current is flowing through the output receptacle 21 corresponding to the relay 24. If the relay 24 with the number corresponding to the count value n is not operating (No in step S3), the count value n is incremented (n = n + 1) as it is (step S7).

  When the relay 24 with the number corresponding to the count value n is in operation (Yes in step S3), that is, when power is supplied from the output receptacle 21 corresponding to the count value n to the load device 30, The power of the output receptacle 21 corresponding to the relay 24 is measured (step S4). Subsequently, it is determined whether or not the power value obtained by adding the measured power value (measured value) and the integrated value is equal to or less than the allowable power (allowable value) (step S5). Here, the allowable power is a threshold value determined from the viewpoint of reducing the possibility of power supply exceeding the rated power in the specification of the power distribution device 20, and is, for example, the value of the rated power in the specification of the power distribution device 20 or the value thereof. This is the same for other embodiments of the power distribution control procedure described later.

  When the power value obtained by adding the measured value and the integrated value is equal to or less than the allowable power (Yes in step S5), the measured value is integrated into the integrated value (step S6), and the count value n is incremented (n = n + 1). (Step S7). Subsequently, it is determined whether the incremented count value n is N or less (step S8). If the incremented count value n is N or less (Yes in step S8), the process returns to step S3, and when the incremented count value n exceeds N (No in step S8), that is, all outputs. If the total power supplied to the receptacle 21 is less than or equal to the allowable power, the procedure is terminated as it is.

  On the other hand, when the power value obtained by adding the measured value and the integrated value exceeds the allowable power in Step S5 (No in Step S5), that is, the power supplied to the output receptacle 21 having the number corresponding to the count values 1 to n. When it is determined that the sum of the above exceeds the allowable power, all the relays 24 thereafter are set to non-drive control (step S9), and the procedure is terminated as it is. That is, the power supply from the output receptacle 21 with the number corresponding to the count values n to N is cut off by setting all the relays 24 with the numbers corresponding to the count values n to N to non-drive control. As a result, it is possible to reduce the total power supplied to all the output receptacles 21 while continuing to supply power to the load device 30 connected to the other output receptacles 21. Therefore, it is possible to maintain a state where the sum of the power supplied to all the output receptacles 21 does not exceed the allowable power without causing a situation where the power supply to all the load devices 30 is interrupted all at once.

  In this way, according to the present invention, it is possible to reduce the possibility that the power supply exceeding the rating will occur without causing the situation where the power supply to all the load devices 30 is interrupted all at once.

<Second embodiment of power distribution control>
A second embodiment of power distribution control by the control device 27 will be described with reference to FIG.
FIG. 6 is a flowchart illustrating a second embodiment of the power distribution control procedure by the control device 27.

  The procedure illustrated in the flowchart is a procedure that is repeatedly executed at regular intervals. Further, the procedure of steps S11 to S18 is the same as steps S1 to S8 (FIG. 5) of the first embodiment, and therefore detailed description thereof is omitted.

  In the power distribution control procedure of the second embodiment, if the power value obtained by adding the measured value and the integrated value exceeds the allowable power in Step S15 (No in Step S15), that is, it corresponds to the count values 1 to n. If it is determined that the total power supplied to the numbered output receptacle 21 exceeds the allowable power, the relay 24 (relay (n)) corresponding to the count value n at that time is set to non-drive control (step S19). ). Subsequently, the count value n is incremented (step S17), and it is determined whether the incremented count value n is N or less (step S18). If the incremented count value n is N or less (Yes in step S18), the process returns to step S13, and the procedure ends when the incremented count value n exceeds N (No in step S18). .

  That is, in the power distribution control procedure of the second embodiment, if it is determined that the total power supplied to the output receptacles 21 corresponding to the count values 1 to n exceeds the allowable power, the count value n at that time is set. Only the relay 24 with the corresponding number is set to non-drive control, so that only the power supply from the output receptacle 21 with the number corresponding to the count value n at that time is cut off. As a result, it is possible to reduce the total power supplied to all the output receptacles 21 while continuing to supply power to the load device 30 connected to the other output receptacles 21. Therefore, it is possible to maintain a state where the sum of the power supplied to all the output receptacles 21 does not exceed the allowable power without causing a situation where the power supply to all the load devices 30 is interrupted all at once.

  In this way, according to the present invention, it is possible to reduce the possibility that the power supply exceeding the rating will occur without causing the situation where the power supply to all the load devices 30 is interrupted all at once.

<Third embodiment of power distribution control>
A third embodiment of power distribution control by the control device 27 will be described with reference to FIG.
FIG. 7 is a flowchart illustrating a third embodiment of the power distribution control procedure by the control device 27.

  The procedure illustrated in the flowchart is a procedure that is repeatedly executed at regular intervals.

  First, it is detected whether or not power supply from any of the output receptacles 21 to the load device 30 is started (step S21). Here, the start of power supply to the load device 30 corresponds to, for example, a case where power supply from the output receptacle 21 to the load device 30 is started by connecting the device to the output receptacle 21. For example, the case where power supply from the output receptacle 21 to the load device 30 is started by turning on the power switch of the load device 30 connected to the output receptacle 21 is applicable. For example, the detection of whether or not the power supply from any of the output receptacles 21 to the load device 30 has been started is detected and stored every time whether or not the currents of all the output receptacles 21 are present, and the presence or absence of the current at the time of the previous detection is detected. And the presence or absence of current at the time of detection this time can be detected.

  If it is not detected that the power supply from any of the output receptacles 21 to the load device 30 has been started (No in step S21), the procedure is terminated as it is. When it is detected that power supply from any of the output receptacles 21 to the load device 30 is started (Yes in step S21), the number x assigned to the output receptacle 21 is stored and held. Hereinafter, the output receptacle 21 that detects the start of power supply to the load device 30 is referred to as a receptacle (x), and the corresponding relay 24 is referred to as a relay (x).

  Subsequently, the integrated value held in the control device 27 is reset (integrated value = 0) (step S22), and the count value n held in the control device 27 is further set to the initial value (n = 1). (Step S23). Subsequently, it is determined whether or not the count value n is N or less (step S24).

  If the count value n is less than or equal to N (Yes in step S24), it is subsequently determined whether or not the relay 24 (relay (n)) having the number corresponding to the count value n is in operation (step S25). That is, it is determined whether power is being supplied from the output receptacle 21 having the number corresponding to the count value n to the load device 30. If the relay 24 with the number corresponding to the count value n is not operating (No in step S25), the count value n is incremented (n = n + 1) as it is (step S28).

  When the relay 24 with the number corresponding to the count value n is in operation (Yes in step S25), that is, when power is supplied from the output receptacle 21 corresponding to the count value n to the load device 30, The power of the output receptacle 21 corresponding to the relay 24 is measured (step S26), and the measured value is added to the integrated value (step S27). Then, the count value n is incremented (n = n + 1) (step S28), and the process returns to step S24.

  When the incremented count value n exceeds N (No in step S24), that is, when the integrated value that is the sum of the power supplied to all the output receptacles 21 is obtained, the integrated value is less than the allowable power. Whether or not (step S29). That is, it is determined whether or not the sum of the power supplied to all the output receptacles 21 exceeds the allowable power due to the start of power supply to the load device 30 in the output receptacle 21 (receptacle (x)). To do. If the integrated value is less than or equal to the allowable power (Yes in step S29), the procedure is terminated as it is.

  If the integrated value exceeds the allowable power (No in step S29), the relay 24 (relay (x)) corresponding to the receptacle (x) is set to non-drive control (step S30), and the procedure ends. To do. That is, the power supply from the output receptacle 21 (receptacle (x)) that detects the start of the power supply to the load device 30 is cut off. Accordingly, it is possible to continue the power supply to the load device 30 connected to the other output receptacles 21 while avoiding a state where the sum of the power supplied to all the output receptacles 21 exceeds the allowable power. That is, it is possible to reduce the possibility that the power supply exceeding the rating will occur without affecting the load device 30 that is already in operation with power supplied from the power distribution device 20.

  In this way, according to the present invention, it is possible to reduce the possibility that the power supply exceeding the rating will occur without causing the situation where the power supply to all the load devices 30 is interrupted all at once.

<Fourth embodiment of power distribution control>
A fourth embodiment of power distribution control by the control device 27 will be described with reference to FIG.
FIG. 8 is a flowchart illustrating a fourth embodiment of the power distribution control procedure by the control device 27.

  The procedure illustrated in the flowchart is a procedure that is repeatedly executed at regular intervals.

  First, the count value n held in the control device 27 is set to an initial value (n = 1) (step S31). Subsequently, it is determined whether or not the relay 24 (relay (n)) with the number corresponding to the count value n is in operation (step S32). That is, it is determined whether power is being supplied from the output receptacle 21 having the number corresponding to the count value n to the load device 30. If the relay 24 with the number corresponding to the count value n is operating (Yes in step S32), the count value n is incremented (n = n + 1) as it is (step S35).

  When the relay 24 (relay (n)) with the number corresponding to the count value n is not in operation (No in step S32), the relay 24 (relay (n)) with the number corresponding to the count value n is kept for a certain time. Only the drive control is performed (step S33), and it is determined whether there is power supply from the output receptacle 21 having the number corresponding to the count value n to the load device 30 (step S34). When there is power supply from the output receptacle 21 of the number corresponding to the count value n to the load device 30 (Yes in step S34), the drive control of the relay 24 of the number corresponding to the count value n is maintained and the count is performed. The value n is incremented (n = n + 1) (step S35). On the other hand, when there is no power supply from the output receptacle 21 having the number corresponding to the count value n to the load device 30 (No in step S34), the relay 24 having the number corresponding to the count value n is set to non-drive control. (Step S37), the count value n is incremented (n = n + 1) (step S35).

  Subsequently, it is determined whether the incremented count value n is N or less (step S36). When the incremented count value n is N or less (Yes in step S36), the process returns to step S32, and when the incremented count value n exceeds N (No in step S18), the procedure ends. To do.

  According to the power distribution control procedure of the embodiment, the output receptacle 21 that has not detected the power supply to the load device 30 is maintained in a state where the power supply from the input receptacle 22 is cut off. It is possible to reduce the possibility that an accident such as an electric shock may occur due to a human body, a tool, or the like coming into contact with the output receptacle 21 that is not connected. In addition, the relay 24 corresponding to the output receptacle 21 in a state where the power supply from the input receptacle 22 is cut off is periodically driven and controlled for a certain period of time, so that the output receptacle 21 depends on whether or not current flows at that time. The connection of the load device 30 to can be detected. Therefore, when the load device 30 is connected to the output receptacle 21 in a state where the power supply from the input receptacle 22 is cut off, the power supply from the input receptacle 22 to the output receptacle 21 can be started and maintained.

DESCRIPTION OF SYMBOLS 10 Power supply system 11 AC / DC converter 12 Charger 13 Battery 14 DC-DC converter 20 Power distribution device 21 Output receptacle 22 Input receptacle 23 DC-DC converter 24 Relay 25 Switch 26 Indicator lamp 27 Control device 28 Field effect transistor 29 Current detection Transformer 30 Load device 40 External device 100 DC power supply system

Claims (9)

A power receiving unit for receiving power;
A plurality of power distribution units to which power received by the power reception unit is supplied;
A current detection circuit for detecting each of the currents flowing through the plurality of power distribution units;
A plurality of relays provided corresponding to each of the power distribution units, configured in a driving state and blocking a power supply path to the power distribution unit received by the power reception unit in a non-driven state;
A plurality of relay drive circuits provided corresponding to each of the relays and driving the relay;
A control device for controlling the relay drive circuit,
The control device detects, for each power distribution unit, power supply from the power distribution unit to a device based on a current flowing through the power distribution unit;
It is determined whether or not the sum of the power supplied to all the power distribution units exceeds an allowable value, and if it is determined that the sum of the power supplied to all the power distribution units exceeds the allowable value, power is supplied to the device. And a means for non-drive-controlling the relay corresponding to any one of the power distribution units supplying the power distribution device.   2. The power distribution device according to claim 1, wherein the control device periodically determines whether or not a sum of power supplied to all the power distribution units exceeds an allowable value. .   3. The power distribution device according to claim 1, wherein the control device detects a start of power supply to the device in any of the power distribution units, and is a sum total of power supplied to all the power distribution units. The power distribution unit that detects the start of power supply to the device when it is determined that the sum of the power supplied to all the power distribution units exceeds the allowable value A power distribution device that performs non-drive control of the relay corresponding to the above.   The power distribution device according to any one of claims 1 to 3, wherein the control device performs non-drive control of the relay corresponding to the power distribution unit with respect to the power distribution unit that has not detected power supply to the device. The power distribution device further comprising means for maintaining and controlling the relay periodically for a predetermined time.   5. The power distribution device according to claim 1, further comprising a communication device having a communication interface function between an external device and the control device.   6. The power distribution device according to claim 5, wherein the control device further includes means for sequentially executing drive control of the plurality of relays with a time difference on condition that an all relay drive request is received from an external device. Power distribution device characterized by 7. The power distribution device according to claim 1, further comprising: a DC voltage converter that converts a DC power voltage of the first DC voltage received by the power receiving unit into a second DC voltage lower than the first DC voltage. In addition,
The power distribution device, wherein the relay drive circuit drives the relay with a second DC voltage output from the DC voltage converter.   The power distribution device according to claim 7, wherein the relay drive circuit further includes a switch that makes the relay non-driven by a manual operation regardless of drive control of the relay by the control device. Power distribution device.   9. The power distribution apparatus according to claim 7, wherein the relay drive circuit further includes an indicator lamp that lights up when the relay is in a drive state.

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