JP6233486B2 - Network system, power supply side device, power reception side device, and method for reducing power consumption in network system - Google Patents

Description

  The present invention relates to a network system, a power supply side device, a power reception side device, and a method for reducing power consumption in a network system.

  Conventionally, a power supply side device such as a switching hub compliant with the PoE (Power over Ethernet (Ethernet is a registered trademark)) standard is known. PoE is a technology defined by IEEE 802.3af (IEEE: The Institute of Electrical and Electronics Engineers) and the like. Data is transmitted between a power supply side device and a power reception side device via a LAN (Local Area Network) cable. Is a technique for performing transmission / reception of power and supplying (feeding) power (see, for example, Patent Document 1).

Special table 2008-529460 gazette JP 2011-234304 A Special table 2008-529359 gazette JP 2011-254209 A JP-T-2004-511956

  However, in the conventional switching hub as the power supply side device, only one maximum power consumption during normal operation of the power receiving side device can be acquired by receiving a notification from the power receiving side device. For this reason, in order to reduce the power consumption, when the switching hub as the power supply side device restricts the power supplied to the power receiving side device, the power supplied to the power receiving side device is the minimum of the power receiving side device. There was a risk that the power required for the operation of this would be lower. As a result, there is a problem that the power receiving side device does not even operate at a minimum, and a trouble on the network may occur. In addition, conventional power supply side devices and power reception side devices have been desired to be reduced in size, reduced in cost, resource-saving, easy to manufacture, and improved in usability.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

(1) According to an aspect of the present invention, a network system using a LAN cable is provided. The network system includes: a power supply side device that supplies power via the LAN cable; and a power reception side device that receives power supply from the power supply side device via the LAN cable, and the power reception side device includes: Notification of notifying the power supply side device of information corresponding to the maximum power consumption in each of the plurality of power consumption modes as well as being a first type power receiving side device having a plurality of power consumption modes having different maximum power consumptions An acquisition unit that acquires information corresponding to the maximum power consumption in each of the plurality of power consumption modes of the power receiving side device; and the power receiving side device when a predetermined condition is satisfied The power supplied to the side device is smaller than the maximum power consumption in the current power consumption mode of the power receiving side device among the plurality of maximum power consumptions of the power receiving side device. It comprises; a limiting portion for limiting to a maximum power consumption are. The first type power receiving side device having a plurality of power consumption modes can operate normally if power equal to or greater than the smallest maximum power consumption among the plurality of power consumption modes is supplied. Therefore, according to the network system of this embodiment, even when the power consumption is reduced, the power supplied to the power receiving device is the smallest maximum power consumption among the plurality of power consumption modes of the power receiving device. Not below. Therefore, power consumption can be reduced without affecting the operation of the power receiving device.

(2) In the network system according to the above aspect, the notification unit of the power receiving side device notifies each of the maximum power consumption in the plurality of power consumption modes by performing class notification to the power supply side device a plurality of times. The acquisition unit of the power supply side device may notify each of the plurality of power consumption modes of the power reception side device based on a plurality of class notifications from the power reception side device. The maximum power consumption may be acquired. According to this form of the network system, it is possible to acquire the maximum power consumption in each of the plurality of power consumption modes of the power receiving device while using the IEEE 802.3af standard.

(3) In the network system of the above aspect, the power supply side device is further based on a plurality of class notifications acquired from the power reception side device, and the power reception side device is the first type power reception side device. Or a determination unit that determines whether the device is a second type power receiving side device having only a single power consumption mode, and the limiting unit is configured for the second type power receiving side device. The supply power need not be limited. According to the network system of this embodiment, the second type power receiving side device having only a single power consumption mode is not limited in supply power, so the second type power receiving side device due to the limitation of supply power. The occurrence of malfunctions in the operation can be suppressed.

(4) In the network system according to the above aspect, when the plurality of class notifications acquired from the power receiving device are all in the same class, the determination unit determines that the power receiving device is the second type. You may determine with it being a power receiving side apparatus. According to this form of the network system, the type of the power receiving device can be determined appropriately.

(5) In the network system according to the above aspect, the notification unit of the power receiving device transmits a frame including information on the maximum power consumption in each of the plurality of power consumption modes in the field to the power feeding device. By doing so, the maximum power consumption in each of the plurality of power consumption modes may be notified to the power supply side device, and the acquisition unit of the power supply side device receives a frame transmitted from the power reception side device. The maximum power consumption in each of the plurality of power consumption modes of the power receiving device may be acquired by referring to the information on the included maximum power consumption. According to the network system of this aspect, it is possible to acquire the maximum power consumption in each of the plurality of power consumption modes of the power receiving device while using the IEEE 802.3at standard.

(6) In the network system according to the above aspect, the power receiving side device further includes a single power receiving side device if the frame acquired from the power receiving side device does not include the maximum power consumption information. A determination unit that determines that the second type power receiving side device has only the power consumption mode of the second type, and the limiting unit limits the supply power to the second type power receiving side device. It is not necessary to do. According to the network system of this embodiment, the second type power receiving side device having only a single power consumption mode is not limited in supply power, so the second type power receiving side device due to the limitation of supply power. The occurrence of malfunctions in the operation can be suppressed.

(7) In the network system of the above embodiment, the power supply side device includes a first type power receiving side device having a plurality of power consumption modes and a second type power receiving side device having only a single power consumption mode. In the case where a plurality of power receiving side devices including the power receiving side device are connected, the limiting unit of the power feeding side device includes the first power supply when the total power supplied to the plurality of power receiving side devices exceeds a predetermined threshold. The power supplied to the first type power receiving side device having the lowest priority among the types of power receiving side devices, and the first type power receiving side among the plurality of maximum power consumptions of the first type power receiving side device. You may restrict | limit to the maximum power consumption smaller than the maximum power consumption of the present power consumption mode of an apparatus. According to this form of the network system, it is possible to reduce the power consumption without limiting the power supply to the first type power receiving device having a high priority.

(8) In the network system according to the above aspect, the restriction unit of the power supply side device may limit the supply power until the total power supply to the plurality of power reception side devices is equal to or less than the predetermined threshold. You may perform with respect to the said 1st type power receiving side apparatus in an order from a low order | rank side. According to the network system of this aspect, the total power supply can be made to be equal to or lower than the predetermined threshold without limiting the power supply as much as possible to the first type power receiving device having a high priority. .

(9) In the network system according to the above aspect, the power supply side device further sets the priority order by a user, an index value related to a communication amount of the power receiving side device, and an index value related to power consumption of the power receiving side device. And a determining unit that determines based on at least one of the above. According to this form of the network system, it is possible to appropriately determine the priority order of the first type power receiving device.

(10) According to another aspect of the present invention, there is provided a power supply side device that supplies power via a LAN cable to a power reception side device having a plurality of power consumption modes having different maximum power consumption. The power supply side device includes: an acquisition unit that acquires information corresponding to the maximum power consumption in each of the plurality of power consumption modes of the power reception side device; and supply to the power reception side device when a predetermined condition is satisfied A limiting unit that limits power to a maximum power consumption that is smaller than a maximum power consumption of a current power consumption mode of the power receiving side device among a plurality of maximum power consumptions of the power receiving side device.

(11) According to another aspect of the present invention, a power receiving device that receives power supply from a power supply device via a LAN cable is provided. The power receiving side device includes a plurality of power consumption modes having different maximum power consumptions, and a notification unit that notifies the power supply side device of information corresponding to the maximum power consumption in each of the plurality of power consumption modes. .

(12) According to another aspect of the present invention, the power receiving side device having a plurality of power consumption modes having different maximum power consumptions and receiving power supply via a LAN cable, and the power receiving side device Provided is a method for reducing power consumption in a network system including a power supply side device that supplies power via a LAN cable. The method of reducing power consumption in the network system includes a step in which the power receiving side device notifies the power feeding side device of information corresponding to maximum power consumption in each of the plurality of power consumption modes; A step of acquiring information corresponding to the maximum power consumption in each of the plurality of power consumption modes of the power receiving side device; and when the power feeding side device satisfies a predetermined condition, the power receiving side device Limiting the power supplied to the maximum power consumption smaller than the maximum power consumption of the current power consumption mode of the power receiving side device among the plurality of maximum power consumptions of the power receiving side device.

  A plurality of constituent elements of each aspect of the present invention described above are not indispensable, and some or all of the effects described in the present specification are to be solved to solve part or all of the above-described problems. In order to achieve the above, it is possible to appropriately change, delete, replace with another new component, and partially delete the limited contents of some of the plurality of components. In order to solve part or all of the above-described problems or to achieve part or all of the effects described in this specification, technical features included in one embodiment of the present invention described above. A part or all of the technical features included in the other aspects of the present invention described above may be combined to form an independent form of the present invention.

  For example, one embodiment of the present invention can be realized as an apparatus including one or more elements out of two elements of a power supply side device and a power reception side device. That is, this apparatus may or may not have a power feeding side device. In addition, the device may or may not have a power receiving device. The power supply side device may be configured as, for example, a power supply side device that supplies power via the LAN cable. The power receiving side device may be configured as, for example, a power receiving side device that receives power supply from the power feeding side device via the LAN cable. The power receiving device may or may not have a notification unit. The notification unit is, for example, a first type power receiving side device having a plurality of power consumption modes having different maximum power consumptions, and information corresponding to the maximum power consumption in each of the plurality of power consumption modes is supplied to the power supply side device. It may be configured as a notification unit that notifies Moreover, the electric power feeding side apparatus may have an acquisition part and does not need to have it. For example, the acquisition unit may be configured as an acquisition unit that acquires information corresponding to the maximum power consumption in each of the plurality of power consumption modes of the power receiving device. Moreover, the electric power feeding side apparatus may have a restriction | limiting part and does not need to have it. The limiting unit, for example, when a predetermined condition is satisfied, the power supplied to the power receiving side device is a maximum of the current power consumption mode of the power receiving side device among the plurality of maximum power consumptions of the power receiving side device. You may comprise as a restriction | limiting part restrict | limited to the maximum power consumption smaller than power consumption. For example, such a device can be realized as a network system, but can also be realized as a device other than the network system. According to such a form, it is possible to solve at least one of various problems such as downsizing of the apparatus, cost reduction, resource saving, easy manufacture, and improvement in usability. Any or all of the technical features of each form of the network system described above can be applied to this apparatus.

  The present invention can be realized in various forms other than the apparatus. For example, it is realized in the form of a network system control method, a power supply side device control method, a power reception side device control method, a computer program for realizing these control methods, a non-temporary recording medium in which the computer program is recorded, or the like. be able to.

It is explanatory drawing which shows the structure of the network system as one Embodiment of this invention. It is a sequence diagram which shows the flow of the process for determining the classification of a receiving side apparatus. It is explanatory drawing which shows the maximum power consumption for every class prescribed | regulated by IEEE802.3. It is explanatory drawing which shows the example which notifies "the maximum power consumption" in a power saving mode using the flame | frame based on LLDP (Link Layer Discovery Protocol). It is a flowchart which shows the flow of the process which judges whether the electric power supply side apparatus restrict | limits the electric power supplied with respect to the power receiving side apparatus. It is a flowchart which shows the flow of the process which restrict | limits the power supply with respect to a power receiving side apparatus in a power feeding side apparatus. It is explanatory drawing which shows the content of the priority table.

Next, embodiments of the present invention will be described in the following order based on the embodiments.
A. Embodiment:
B. Variations:

A. Embodiment:
FIG. 1 is an explanatory diagram showing a configuration of a network system 10 as an embodiment of the present invention. The network system 10 includes a power supply side device 100, five power reception side devices 200, and a power reception side device 300.

  The power supply side device 100 is PSE (Power Sourcing Equipment) compliant with the PoE standard, and supplies power to the power reception side devices 200 and 300 via a LAN cable. In the present embodiment, the power supply side device 100 is a switching hub compliant with the PoE standard, and includes an upstream LAN port P0, a plurality of downstream LAN ports P1 to P6, a CPU 110, a flash ROM 130, a RAM 140, and communication control. Part 150. The power supply side device 100 transmits and receives data (packets) to and from a switching engine (not shown) and a power receiving device connected to the LAN in order to realize a general function as a switching hub. A transmission / reception circuit (not shown) is also provided.

  A plurality of power receiving devices 200 and 300 are connected to the downstream LAN ports P <b> 1 to P <b> 6 of the power supply device 100. The downstream LAN ports P1 to P6 also function as power supply ports for the plurality of power receiving devices 200 and 300.

  The CPU 110 functions as the acquisition unit 111, the restriction unit 112, the determination unit 113, the determination unit 114, the power monitoring unit 115, and the traffic monitoring unit 116 by reading the computer program stored in the flash ROM 130 into the RAM 140 and executing it. To do. These functions will be described later. The flash ROM 130 stores a priority table 132. Details of the priority order table 132 will be described later. The communication control unit 150 controls communication at each LAN port.

  The power receiving side device 200 is a PD (Powered Device) conforming to the PoE standard, and receives power supply from the power feeding side device 100 via a LAN cable. Examples of the power receiving device 200 include a Web camera, a wireless LAN access point, an IP phone, and a switching hub.

  In the present embodiment, the power receiving device 200 has two power consumption modes with different maximum power consumption. The two power consumption modes include a “normal mode” in which a normal operation is performed and a “power saving mode” in which a certain operation is restricted in order to reduce power consumption. The power receiving device 200 includes a notification unit 210. The notification unit 210 notifies the power supply side device 100 of information corresponding to the maximum power consumption in each of the two power consumption modes.

  In the present embodiment, the power receiving device 200 having two power consumption modes is also referred to as a “first type power receiving device”. The first-type power receiving device 200 shifts to the “power saving mode” even if the power supplied from the power feeding device 100 is limited and falls below the maximum power consumption in the “normal mode”, and the operation is unstable. It will never be. However, if the power supplied from the power supply side device 100 is less than the maximum power consumption in the “power saving mode”, the power receiving side device 200 may become unstable in operation.

  The power receiving side device 300 is different from the power receiving side device 200 only in that it has only the “normal mode” and does not have the “power saving mode”, and the other configuration is the same as that of the power receiving side device 200. It is. The power receiving device 300 includes a notification unit 310. The notification unit 310 notifies the power supply side device 100 of information corresponding to the maximum power consumption in the “normal mode”.

  In the present embodiment, the power receiving side device 300 having only a single power consumption mode is also referred to as a “second type power receiving side device”. Since the second type power receiving side device 300 does not have the “power saving mode”, if the power supplied from the power feeding side device 100 is limited and falls below the maximum power consumption in the “normal mode”, the operation is performed. May become unstable.

  FIG. 2 is a sequence diagram showing a flow of processing for determining the type of the power receiving device. In the example illustrated in FIG. 2, a case will be described in which the power receiving devices 200 and 300 comply with the IEEE 802.3af standard but do not comply with the IEEE 802.3at standard.

  In step S100, when the power receiving side devices 200 and 300 are connected to the LAN ports P1 to P6 of the power feeding side device 100, the power feeding side device 100 detects the signature resistance of the power receiving side devices 200 and 300, and the power receiving side device 200. , 300 are detected, and the process proceeds to the class classification phase shown in step S102 and subsequent steps.

  FIG. 3 is an explanatory diagram showing the maximum power consumption for each class defined by IEEE802.3. As shown in FIG. 3, in the IEEE802.3af and IEEE802.3at standards, the maximum power consumption of the power receiving device is determined for each class.

  In step S <b> 102 (FIG. 2), the power supply side device 100 applies a voltage of 15.5 to 20.5 V for 10 to 75 msec to the connected power reception side devices 200 and 300.

  In step S104 (FIG. 2), the notification units 210 and 310 of the power receiving side devices 200 and 300 cause the “class” of the power receiving side device 100 to have their own “class” by flowing a current according to their “class”. Make the first notification. In step S110, the acquisition unit 111 of the power supply side device 100 receives the first “class” notification from the notification units 210 and 310 of the power reception side devices 200 and 300, and acquires “maximum power consumption”.

  In step S112, the power supply side device 100 lowers the voltage applied to the power receiving side devices 200 and 300 to 7.0 to 10.0 V (Mark Event Voltage), and reduces the voltage for 6 to 12 msec. maintain. In step S <b> 114, the power feeding side device 100 applies a voltage of 15.5 to 20.5 V for 10 to 75 msec to the power receiving side devices 200 and 300.

  In step S120, the notification units 210 and 310 of the power receiving devices 200 and 300 send a current corresponding to their “class” to the power supply device 100 for the second notification of their “class”. To do. The acquisition unit 111 of the power supply side device 100 receives the second “class” notification from the notification units 210 and 310 of the power reception side devices 200 and 300 and acquires “maximum power consumption”.

  Here, the notification unit 210 of the first type power receiving device 200 notifies “maximum power consumption” in “normal mode” in the first “class” notification, and in the second “class” notification. Notifies “maximum power consumption” in the “power saving mode”.

  On the other hand, the notification unit 310 of the second type power receiving device 300 notifies the “maximum power consumption” in the “normal mode” in the first “class” notification, and also in the second “class” notification. , “Maximum power consumption” in “normal mode” is notified. That is, the second type power receiving device 300 that does not have the “power saving mode” inevitably performs the same notification as the first notification.

  In step S130, the determination unit 113 of the power supply side device 100 determines that the power receiving side device connected to the LAN port is the first type based on the first “class” notification and the second “class” notification. It is determined whether the device is a power receiving device 200 or a second type power receiving device 300. Specifically, different “maximum power consumption” is notified in the first “class” notification and second “class” notification, and “maximum power consumption” in the second “class” notification. Is smaller than the “maximum power consumption” in the first notification of “class”, the determination unit 113 of the power supply side device 100 is the first type power reception side device having the power saving mode. It is determined that 200 is connected to the LAN port.

On the other hand, in cases other than the above in the first “class” notification and the second “class” notification, specifically, when any of the following conditions 1 to 4 is satisfied, the power supply side The determination unit 113 of the device 100 determines that the second type power receiving device 300 that does not have the power saving mode is connected to the LAN port.
Condition 1: When the same “class (maximum power consumption)” is notified in the second “class” notification and the second “class” notification. Condition 2: “Class” in the second “class” notification. When “Maximum power consumption” is greater than “Maximum power consumption” in the first “Class” notification Condition 3: In either the first “Class” notification or the second “Class” notification When “Class 0” is notified Condition 4: Current that does not correspond to any “class” shown in FIG. 3 in either the first “class” notification or the second “class” notification When a value is passed

  In this way, the power supply side device 100 of the present embodiment determines whether or not the power reception side devices 200 and 300 have the power saving mode while using the IEEE 802.3af standard, and receives the first type of power reception. The “maximum power consumption” in each of the plurality of power consumption modes of the side device 200 is acquired.

  FIG. 4 is an explanatory diagram illustrating an example in which “maximum power consumption” in the “power saving mode” is notified using a frame compliant with LLDP (Link Layer Discovery Protocol). The first type power receiving device 200 compliant with the IEEE 802.3at standard notifies the power supply device 100 of the “maximum power consumption” in its “power saving mode” using a frame compliant with LLDP. To do.

  Specifically, in the example illustrated in FIG. 4A, the notification unit 210 of the power receiving device 200 displays “maximum power consumption” in the power saving mode in the “PSE allocated power value” field of the LLDP-compliant frame. The frame is transmitted to the power supply side device 100.

  Also, in the example shown in FIG. 4B, the notification unit 210 of the power receiving side device 200 adds a new field (for example, PD max power for energy) after the “PSE allocated power value” field of the LLDP-compliant frame. saving field), and the frame includes the information of “maximum power consumption” in the power saving mode, and transmits the frame to the power supply side device 100.

  The acquisition unit 111 of the power supply side device 100 compliant with the IEEE 802.3at standard refers to the “maximum power consumption” information in the “power saving mode” included in these fields, thereby “ Acquire “maximum power consumption” in “power saving mode”.

  On the other hand, the notification unit 310 of the second type power receiving device 300 that does not have the “power saving mode” transmits a frame compliant with the conventional LLDP to the power supply device 100. When the frame acquired from the power receiving device 300 does not include the “maximum power consumption” information in the power saving mode, the determination unit 113 of the power feeding device 100 compatible with the IEEE 802.3at standard It is determined that the device 300 is a second type power receiving device that does not have the “power saving mode”.

  In this manner, the power supply side device 100 according to the present embodiment determines whether or not the power reception side devices 200 and 300 have the power saving mode while using the IEEE 802.3at standard, and receives the first type of power reception. The maximum power consumption in each of the plurality of power consumption modes of the side device 200 is acquired.

  FIG. 5 is a flowchart showing a flow of processing for determining whether or not to limit power supplied to the power receiving device 200 in the power supply device 100. In step S <b> 200, the power supply side device 100 determines whether or not the current time is a “power saving time zone” preset in the flash ROM 130. The “power saving time zone” is a time zone for promoting power saving, and in this embodiment, a time zone in which the power receiving side devices 200 and 300 are not frequently used by the user is set as the “power saving time zone”. Shall be.

  Specifically, for example, when the time zone from 20:00 to 8:00 is preset as a “power saving time zone”, and the current time is between 8:00 and 20:00 (step S200: No), the power supply apparatus 100 proceeds to the process shown in step S210.

  On the other hand, when the current time is between 20:00 and 8:00 (step S200: Yes), the restriction unit 112 of the power supply side device 100 proceeds to the process shown in step S300 and has the first type having the power saving mode. The power supply to the power receiving side device 200 is limited. Details of the processing shown in step S300 will be described later.

  In step S <b> 210, the power supply apparatus 100 determines whether or not the current day of the week is a “power saving day” preset in the flash ROM 130. “Power saving day” is a day of promoting power saving, and a day of low usage frequency of the power receiving devices 200 and 300 by the user is set as “power saving day”.

  Specifically, for example, when Saturday and Sunday are preset as “power saving days” and the current day of the week is any one of Monday to Friday (step S210: No), the power supply side device In step S100, the process proceeds to step S220.

  On the other hand, when the current day of the week is either Saturday or Sunday (step S210: Yes), the restriction unit 112 of the power supply side device 100 proceeds to the process shown in step S300 and has the first power saving mode. The power supply to the kind of power receiving device 200 is limited. A holiday may be set as the “power saving day”.

  In step S220, the power monitoring unit 115 of the power supply side device 100 determines whether or not the total of the current supply power to the plurality of power receiving side devices 200 and 300 exceeds a predetermined threshold value. In the present embodiment, the predetermined threshold is set to 90% of the power supply capability of the power supply side device 100. If the total supplied power does not exceed the predetermined threshold (step S220: No), the power supply side device 100 proceeds to the process shown in step S230.

  On the other hand, when the total supplied power exceeds the predetermined threshold (step S220: Yes), the restriction unit 112 of the power supply side device 100 proceeds to the process shown in step S300 and has the first power saving mode. The power supply to the kind of power receiving device 200 is limited.

  In step S <b> 230, the power monitoring unit 115 of the power supply side device 100 determines whether or not the sum of the power usage [kW · h] exceeds a predetermined threshold. Specifically, for example, the user presets a threshold value that is the upper limit of the monthly power usage amount, and if the total of the monthly power usage amount does not exceed the threshold value (step S230: No) The power supply side device 100 ends the process. In the present embodiment, the power monitoring unit 115 of the power supply side device 100 integrates the power usage amount from the first day to the last day of the month as the total power usage amount for each month. However, the power monitoring unit 115 of the power supply side device 100 may integrate the power usage amount in other periods.

  On the other hand, when the total amount of power used this month exceeds the threshold (step S230: Yes), the restriction unit 112 of the power supply side device 100 proceeds to the process shown in step S300 and has a power saving mode. The power supply to the first type power receiving device 200 is limited.

  It should be noted that the “power saving time zone” and “power saving day”, the predetermined threshold value of power supply, and the predetermined threshold value of power usage set in the flash ROM 130 can be changed by the user. Moreover, these information may be preserve | saved on the cloud and the electric power feeding side apparatus 100 may access these information preserve | saved on the cloud.

  FIG. 6 is a flowchart showing a flow of processing for limiting power supplied to the power receiving device 200 in the power supply device 100. In step S <b> 310, the determination unit 114 of the power supply side device 100 determines the priority order of the plurality of power reception side devices 200. This priority order is stored in the priority order table 132 (FIG. 1).

  Note that the limiting unit 112 of the power supply side device 100 does not limit the power supply to the second type power supply side device 100 that does not have the power saving mode. Therefore, the determination unit 114 does not determine the priority order for the power supply side device 100. A method for determining the priority will be described later.

  In step S <b> 314, the restriction unit 112 of the power supply side device 100 sets the first type of power receiving side devices 200 that are the targets of the supply power restriction in order from the lowest priority side.

  In step S <b> 320, the restriction unit 112 of the power supply side device 100 receives the power supplied to the first type power receiving side device 200 set as the target of the power supply restriction among the first type power receiving side devices 200. Limit to “maximum power consumption” in the “power saving mode” of the side device 200.

  In step S324, the restriction unit 112 of the power supply side device 100 determines whether or not the power supply restriction is performed on the first type power receiving side device 200 having the highest priority. When the limitation of the power supply is performed on the first type power receiving device 200 having the highest priority (step S324: Yes), the limiting unit 112 of the power supply device 100 ends the process. . On the other hand, when the limitation of the supplied power is not performed on the first type power receiving device 200 having the highest priority (step S324: No), the limiting unit 112 of the power feeding device 100 sets the step. The process proceeds to S330.

  In step S330, the restriction unit 112 of the power supply side device 100 determines whether the total power supplied to the plurality of power reception side devices 200 and 300 is equal to or less than a predetermined threshold. When the total power supplied to the plurality of power receiving devices 200 and 300 is not equal to or less than the predetermined threshold (step S330: No), the restriction unit 112 of the power feeding device 100 proceeds to the process shown in step S314. Then, the first type power receiving device 200 having the next lowest priority is set as a target for limiting the power supply.

  On the other hand, when the total power supplied to the plurality of power receiving devices 200 and 300 is equal to or less than a predetermined threshold (step S330: Yes), the limiting unit 112 of the power feeding device 100 ends the process. That is, the restriction unit 112 of the power supply side device 100 limits the supply power in order from the lowest priority side until the sum of the supply power to the plurality of power reception side devices 200 and 300 becomes a predetermined threshold value or less. This is performed for one type of power receiving device 200.

  FIG. 7 is an explanatory diagram showing the contents of the priority table 132. As described above, the determination unit 114 of the power supply side device 100 determines the priority order of the plurality of first type power reception side devices 200. In the example illustrated in FIG. 5, the determination unit 114 determines that the priority order of the power receiving device 200 whose “priority” is set to “H (High)” and “priority” is “L (Low)”. The priority order is determined so as to be higher than the priority order of the power receiving device 200 that is set to “1”.

  The “priority” may be set for each port of the power supply side device 100 or may be set on the power reception side device 200 side. The “priority” may be arbitrarily set by the user.

  For the power receiving device 200 having the same “priority”, the determination unit 114 determines that the priority order of the power receiving device 200 having a large “communication amount (data amount) [MByte]” has a small “communication amount”. The priority order is determined so as to be higher than the priority order of the power receiving device 200. In this embodiment, the determination unit 114 determines the priority order based on the total of the most recent transmission and reception traffic per hour. However, the determination unit 114 may determine the priority order based on the total amount of communication of at least one of transmission and reception. Note that the communication amount of the power receiving device 200 is monitored by the communication amount monitoring unit 116 of the power supply device 100.

  For the power receiving side device 200 having the same “communication amount”, the determination unit 114 determines that the priority order of the power receiving side device 200 having the small “power consumption [W · h]” is “high power consumption”. The priority order is determined so as to be higher than the priority order of the power receiving device 200. In the present embodiment, the determination unit 114 determines the priority order based on the latest total power consumption per hour. In this way, since the power supply is limited from the power receiving device 200 with a large amount of power consumption, the effect of reducing the power consumption is increased.

  As a result, the priority order of the first type power receiving device 200 connected from the port P1 to the port P5 is as shown in the right column of FIG. Note that since the second type power receiving device 300 that does not have the power saving mode is connected to the port P6, the priority order is not set.

  As described above, in the present embodiment, the “maximum power consumption” in the “power saving mode” of the power receiving side device 200 is acquired, and the limitation of the power supplied to the power receiving side device 200 is set to the “maximum power consumption” in the “power saving mode”. Therefore, the power supplied to the power receiving device 200 does not fall below the “maximum power consumption” in the “power saving mode”. Therefore, power consumption can be reduced without affecting the operation of the power receiving device 200.

  Furthermore, in the present embodiment, the second type power receiving side device 300 having only a single power consumption mode is not limited in supply power, and therefore the second type power receiving side device 300 due to the limitation of supply power. The occurrence of malfunctions in the operation can be suppressed.

  Furthermore, in the present embodiment, it is possible to reduce the total supply power to a predetermined threshold value or less without limiting the supply power as much as possible to the first type power receiving device 200 having a high priority.

B. Variations:
The present invention is not limited to the above-described embodiments and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

B1. Modification 1:
In the above-described embodiment, the first type power receiving device 200 has two types of power consumption modes of “normal mode” and “power saving mode”. However, the first type power receiving device 200 may have two or more types of power consumption modes. In this case, the notification unit 210 of the power receiving device 200 may notify the “class” a plurality of times triggered by the application of a predetermined voltage from the power supply device 100 or add a plurality of fields to the frame. That's fine. In the above embodiment, names such as “normal mode” and “power saving mode” are given to the two power consumption modes, but names different from these are given to the power consumption mode. The name may not be given.

B2. Modification 2:
In the above-described embodiment, the restriction unit 112 of the power supply side device 100 limits the supply power in order from the lowest priority side until the total power supply to the plurality of power reception side devices 200 and 300 is equal to or less than a predetermined threshold. In addition, the process is performed on the first type power receiving device 200. However, the limiting unit 112 of the power supply side device 100 may limit the supply power only to the first type power receiving side device 200 having the lowest priority.

B3. Modification 3:
In the above embodiment, the number of LAN ports is seven, but the number of LAN ports may be six or less, or eight or more.

B4. Modification 4:
In the above embodiment, the supply power is limited in step S300 when at least one of the four conditions shown in FIG. 5 is satisfied. However, the four conditions shown in FIG. 5 are exemplifications, and the condition for limiting the power supply in step S300 may be five or more, or may be three or less.

B5. Modification 5:
In the above-described embodiment, the determination unit 114 sets the priority order so that the priority order of the power receiving device 200 having a small “power consumption” is higher than the priority order of the power receiving device 200 having a high “power consumption”. decide. However, the determination unit 114 determines priorities based on “power consumption [W]” of the power receiving device 200 and “power consumption [W] in the power saving mode” instead of “power consumption”. Also good. For example, the determination unit 114 sets the priority order so that the priority order of the power receiving side device 200 with a small “power consumption in the power saving mode” is lower than the priority order of the power receiving side device 200 with a large “power consumption amount”. You may decide. In this way, the power consumption is limited from the power receiving device 200 with less “power consumption in the power saving mode”, so that the effect of reducing the power consumption is increased.

B6. Modification 6:
In the above embodiment, some of the functions realized by software may be realized by hardware, or some of the functions realized by hardware may be realized by software.

  The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations without departing from the spirit thereof. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the above effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10 ... Network system 100 ... Power supply side device 110 ... CPU
DESCRIPTION OF SYMBOLS 111 ... Acquisition part 112 ... Restriction part 113 ... Determination part 114 ... Determination part 115 ... Power monitoring part 116 ... Communication amount monitoring part 130 ... Flash ROM
132 ... priority order table 140 ... RAM
DESCRIPTION OF SYMBOLS 150 ... Communication control part 200 ... Power receiving side apparatus 210 ... Notification part 300 ... Power receiving side apparatus 310 ... Notification part

Claims (6)

A network system using a LAN cable,
A power supply side device for supplying power via the LAN cable;
A power receiving device that receives power supply from the power supply device via the LAN cable;
With
The power receiving side device is a first type power receiving side device having a plurality of power consumption modes having different maximum power consumptions, and information corresponding to the maximum power consumption in each of the plurality of power consumption modes is supplied to the power feeding side device. A notification unit for notifying the power supply side device of the maximum power consumption in the plurality of power consumption modes by performing class notification to the power supply side device a plurality of times. Part
The power supply side device is:
An acquisition unit that acquires information corresponding to the maximum power consumption in each of the plurality of power consumption modes of the power receiving device, wherein the power receiving device is based on a plurality of class notifications from the power receiving device. An acquisition unit for acquiring maximum power consumption in each of the plurality of power consumption modes ;
Based on a plurality of class notifications acquired from the power receiving side device, the power receiving side device is the first type power receiving side device or a second type power receiving side device having only a single power consumption mode. A determination unit for determining whether or not
When a predetermined condition is satisfied, the power supplied to the power receiving device is a maximum power consumption that is smaller than the maximum power consumption in the current power consumption mode of the power receiving device among the plurality of maximum power consumptions of the power receiving device. A network system comprising: a limiting unit that limits power consumption, and a limiting unit that does not limit the supply power to the second type power receiving device . The network system according to claim 1,
The determination unit determines that the power receiving side device is the second type power receiving side device when all of the plurality of class notifications acquired from the power receiving side device are the same class,
Network system. The network system according to claim 1,
The notifying unit of the power receiving side device transmits a frame including information on the maximum power consumption of each of the plurality of power consumption modes in the field to the power supply side device, thereby the plurality of power consumption modes. To each power consumption side in the power supply side device,
The acquisition unit of the power supply side device refers to information on the maximum power consumption included in a frame transmitted from the power reception side device, so that the maximum power consumption in each of the plurality of power consumption modes of the power reception side device is achieved. Get power,
Network system. The network system according to claim 3 ,
The determination unit, before Symbol frame acquired from the power-receiving-side instrument, if it does not contain the information of the maximum power consumption, the power receiving the power-receiving-side instrument is of the second type having only a single power consumption mode To determine that it is a side device ,
Netw network system. A power supply side device that supplies power via a LAN cable to a power reception side device having a plurality of power consumption modes having different maximum power consumptions,
An acquisition unit that acquires information corresponding to the maximum power consumption in each of the plurality of power consumption modes of the power receiving device, wherein the power receiving device is based on a plurality of class notifications from the power receiving device. An acquisition unit for acquiring maximum power consumption in each of the plurality of power consumption modes ;
Based on a plurality of class notifications acquired from the power receiving side device, the power receiving side device is the first type power receiving side device or a second type power receiving side device having only a single power consumption mode. A determination unit for determining whether or not
When a predetermined condition is satisfied, the power supplied to the power receiving device is a maximum power consumption that is smaller than the maximum power consumption in the current power consumption mode of the power receiving device among the plurality of maximum power consumptions of the power receiving device. A power supply-side device comprising: a restriction unit that restricts power consumption, and a restriction unit that does not restrict the supply power to the second type power receiving device. A power receiving side device having a plurality of power consumption modes having different maximum power consumptions and receiving power supply via a LAN cable; and a power feeding side device supplying power to the power receiving side device via the LAN cable; A method for reducing power consumption in a network system comprising:
The power receiving device is a step of notifying the power supply device of information corresponding to the maximum power consumption in each of the plurality of power consumption modes, and performing class notification to the power supply device multiple times. The step of notifying the power supply side device of each maximum power consumption in the plurality of power consumption modes ,
The power supply side device is a step of obtaining information corresponding to the maximum power consumption in each of the plurality of power consumption modes of the power receiving side device, and based on a plurality of class notifications from the power receiving side device. Obtaining a maximum power consumption in each of the plurality of power consumption modes of the power receiving device ;
Based on a plurality of class notifications acquired from the power receiving side device, the power receiving side device is the first type power receiving side device or a second type power receiving side device having only a single power consumption mode. A step of determining whether or not
When the power supply side device satisfies a predetermined condition, the power supplied to the power receiving side device is the maximum of the plurality of maximum power consumption of the power receiving side device in the current power consumption mode of the power receiving side device. A step of limiting to a maximum power consumption smaller than a power consumption, the step of not limiting the supply power for the second type power receiving side device ;
A method comprising:

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