JP5167911B2 - Power feeding circuit and power feeding method - Google Patents

Description

  The present invention relates to a PoE (Power over Ethernet: Ethernet is a registered trademark of Xerox Corporation) power supply circuit and power supply method.

  Recently, energy conservation measures for global environmental conservation are being studied at a global level, and legislation studies for energy conservation and reduction of carbon dioxide emissions have begun to be discussed in various countries.

  In general, energy consumption associated with transportation, logistics, and manufacturing is often regarded as the target, but as with electronic devices such as computers and servers, an increase in energy consumption related to information communication devices and network infrastructure is also gaining attention. .

  Electronic devices such as computers and servers have a relatively long time during which computation processing is not performed (so-called standby state), so it is possible to reduce average power consumption by suppressing power consumption in the standby state. The effect that can contribute to the reduction of the converted carbon dioxide emissions is high.

  On the other hand, information communication equipment is required to always maintain a data communicable state while changing from analog communication to digital communication, and it is assumed that a standby state cannot be tolerated like electronic devices such as computers and servers. There are conditions. That is, the average power consumption can only be reduced by lowering the steady operating power value. For this reason, the mainstream of power reduction is a method from the viewpoint of device technology, which is to increase the integration of electronic components and reduce the operating voltage associated with the miniaturization of electronic components.

  In recent years, there is a PoE (Power over Ethernet) regulation in IEEE (Institute of Electrical and Electronic Engineers) 802.3af as a power supply method centering on Ethernet (registered trademark of Xerox Corporation) among communication devices, so-called IP (Internet). The PoE power supply method is used in devices that are difficult to secure their own device power while using Ethernet for data transmission paths such as telephones, wireless LAN (Local Area Network) access points, and monitoring WEB (World Wide Web) cameras. The number of switch products and router products increased.

  PoE is a technology for supplying power using a cable (category 5 twisted pair) used for Ethernet wiring, and was standardized as IEEE 802.3af in June 2003. A 48V DC voltage can supply up to 15.4W of power and can be used to connect devices that are difficult to secure power sources or devices that do not require a conventional power source to the Ethernet interface. For example, VoIP ( Application to telephones (IP phones) compatible with Voice over IP, wireless LAN access points, Web cameras, and the like is expected.

  This PoE was originally born as a power supply method for LAN, but it is also being adopted as a method for supplying power to remote devices such as a recent Ethernet dedicated line or a wide area Ethernet network.

  Phantom power supply has been adopted for communication networks such as analog subscriber lines, ISDN subscriber lines, xDSL subscriber lines, remote subscriber accommodation devices, etc., but the IEEE 802.3af PoE power supply system has phantom power supply. There are an A system (Type A) that is superimposed on a data signal line similar to the above and a B system (Type B) that performs power transmission using an empty signal line. The power feeding side can select either of these two systems, but the power receiving side is prescribed to have a configuration that can receive power by either of these two systems.

  On the other hand, a remote device such as an Ethernet dedicated line or a wide area Ethernet network may use a connection line with a higher-level device side in order to ensure the reliability of the Ethernet line (see Patent Document 1). As described above, PoE power supply is required even when a host device connected to a remote device such as an Ethernet dedicated line or a wide area Ethernet network performs line redundancy.

  In the prior art, an abnormality in the working line is detected and switched from the working line to the protection line, but triggered by the detection of the data signal link disconnection state or the CRC error of the Ethernet frame. For this reason, since it takes too much time to switch the PoE power supply, if power is supplied only to the working line, if there is a disconnection of the working line, etc., there is a drawback that the power supply side remote device instantaneously cuts off when switching to the protection line. It was.

  In order to avoid this drawback, the power supply unit on the power supply side can often supply power to both the working line and the standby line at the same time as the phantom power supply of the conventional remote subscriber accommodation device (redundant line).

  A conventional configuration example will be described with reference to FIGS.

  FIG. 5 is a diagram illustrating a conventional power supply configuration example of a packet communication device that performs PoE power supply via an Ethernet duplex line.

  In this example, the remote accommodation device (201) and the remote device (202) are connected in an Ethernet duplex manner by the # 0 twisted pair line (203) and the # 1 twisted pair line (204).

  The maximum power capacities of the PoE power supply 0 part (218) and the PoE power supply 1 part (219) in the remote accommodation apparatus (201) are 15.4 W as defined in IEEE 802.3af. Also, the power supply path is transmitted through the secondary intermediate taps of the transmission transformer # 0 (211) and the transmission transformer # 1 (212) through the # 0 twisted pair line (203) and the # 1 twisted pair line (204), respectively. The sum is obtained through the power summing circuits (223), (224), and (225) through the primary intermediate taps of the receiving transformer # 0 (221) and the receiving transformer # 1 (222) in the device (202). The power of 8 W is supplied to the in-device power supply unit (226).

  FIG. 6 is a diagram illustrating another conventional power supply configuration example of a packet communication device that performs PoE power supply via an Ethernet duplex line.

  In this example, the remote accommodating apparatus (301) and the remote apparatus (302) are connected by Ethernet duplex using the # 0 twisted pair line (303) and the # 1 twisted pair line (304).

  The respective maximum power capacities of the PoE power supply 0 part (318) and the PoE power supply 1 part (319) in the remote accommodation apparatus (301) are 15.4 W as defined by IEEE 802.3af. The power supply path is transmitted through the power line of the # 0 twisted pair line (303) and the power line of the # 1 twisted pair line (304). And 30.8 W of power is supplied to the in-device power supply unit (326).

  Patent Document 1 discloses a technique for duplexing Ethernet lines as described in FIG. 1 and paragraph 0001.

  Patent Document 2 discloses a technique for monitoring a current flowing through a line and detecting a line break, as described in paragraph 0015.

  In Patent Document 3, as shown in FIG. 12 and paragraph number 0065, two power receiving terminals are provided, and when power from one side falls below the threshold, power is received from the other, and the power receiving path is duplicated. The technology is disclosed.

  Patent Document 4 discloses a technique related to a power supply control method including a method of supplying power by superimposing power on a signal line and a method of supplying power through a power line, as described in FIGS. Is disclosed.

JP 2003-324438 A JP 2000-083095 A JP 2006-203730 A Japanese Patent Application Laid-Open No. 07-154513

  The conventional example described above has the following problems.

  That is, in the conventional example shown in FIG. 5 and FIG. 6, since the power-receiving-side remote apparatus performs line switching without instantaneous interruption, it is configured to use the sum of the two powers of the working line and the protection line, and the supplied power must be loaded. The power supply side power is doubled, and there is a problem of consuming twice the power.

  In PoE, IEEE802.3af specifies that a maximum of 15.4W can be supplied at 48V per line. Therefore, in the conventional example, twice the power of 30.8W is provided for the working line and the protection line. As a result, the standby power consumption for PoE power supply increases in proportion to the number of accommodated duplex lines.

  In addition, the PoE power supply unit in the remote accommodating device is fixed at a maximum power supply power of 15.4 W, and the number of fixed installations is reduced to one, and the supply line switching means in the event of a failure such as failure or disconnection on one of the duplicated Ethernet lines However, the power consumption does not double, but there is a problem that an instantaneous interruption occurs in which the power always becomes zero when the power supply line is switched.

  Note that the invention described in Patent Document 1 only discloses a technique for duplicating signal lines, does not disclose PoE power feeding, and still has the above-described problems.

  Further, the invention described in Patent Document 2 only discloses a technique for detecting line disconnection, does not disclose PoE power feeding, and still has the above-described problems.

  The invention described in Patent Document 3 discloses PoE feeding and duplexing of feeding paths, but switching the duplexed configuration still has the above-mentioned problems.

  In addition, in the invention described in Patent Document 4, although a power supply control method including a method of supplying power by superimposing power on a signal line and a method of supplying power through a power line is disclosed, switching of a duplexed configuration is disclosed. He had the above problems.

  The present invention has been made in view of the above points, and PoE that reduces power consumption without causing instantaneous power supply interruption at the time of line switching of a power-receiving-side remote device during PoE power supply in a redundant Ethernet line configuration. An object is to provide a power feeding circuit and a power feeding method.

In solving the above-described problems, the present invention provides that the working line has a signal line and a power line, the standby line has a signal line and a power line, the signal line of the working line, the power line of the working line, In a PoE power supply circuit that feeds power through one of the signal line of the standby system line and the power line of the standby system line, the signal line of the active system line, the power line of the active system line, the signal line of the standby system line And power supply means for supplying power using any two of the power lines of the standby system line, and the power supply means has switching means for switching between the two lines for supplying power .

  In the present invention, the power supply means may include a first power supply unit that supplies power to one of the two lines that perform power supply, and a second power that supplies power to the other of the two lines that perform power supply. And a power feeding unit.

  Further, the present invention provides a first transmission transformer that superimposes power on the signal line of the working line, a second transmission transformer that superimposes power on the signal line of the protection line, and the first transmission transformer. A first power switching unit that switches a connection with the first power feeding unit, a connection between a power line of the standby line and the first power feeding unit, the second transmission transformer, and the second power feeding. Between the first power supply unit and the first switching unit, the second power switching unit for switching between the connection to the power supply unit and the connection between the power line of the active line and the second power supply unit A first current monitoring unit that detects current between the first current monitoring unit, a second current monitoring unit that is provided between the second power feeding unit and the second switching unit, and detects a current therebetween. , The detection result by the first current monitoring unit and the detection result by the second current monitoring unit Zui it, characterized in that a power feeding switch control unit that performs connection switching of the first power switching unit and the second power switching unit.

  According to the present invention, when the power supply switching control unit has a normal detection result by the first current monitoring unit and a detection result by the second current monitoring unit is normal, The power switching unit switches so as to connect the first transmission transformer and the first power feeding unit, and the second power switching unit connects the second transmission transformer and the second power feeding unit. When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is abnormal, the first power switching unit is switched to the first current monitoring unit. The transmission transformer and the first power feeding unit are switched to be connected, and the second power switching unit is switched to connect the power line of the working line and the second power feeding unit, The detection result by the current monitoring unit 1 is abnormal And when the detection result by the second current monitoring unit is normal, the first power switching unit switches so as to connect the power line of the standby line and the first power feeding unit, and The second power switching unit switches so as to connect the second transmission transformer and the second power feeding unit, the detection result by the first current monitoring unit is abnormal, and the second current monitoring When the detection result by the unit is abnormal, the first power feeding unit and the second power feeding unit are instructed to stop power feeding.

  Further, the present invention provides a first transmission transformer that superimposes power on the signal line of the working line, a second transmission transformer that superimposes power on the signal line of the protection line, and the second transmission transformer. A first power switching unit that switches a connection with the first power feeding unit, a connection between a power line of the working line and the first power feeding unit, the first transmission transformer, and the second power feeding. Between the first power supply unit and the first switching unit, the second power switching unit for switching the connection between the first power supply unit and the second power feeding unit. A first current monitoring unit that detects current between the first current monitoring unit, a second current monitoring unit that is provided between the second power feeding unit and the second switching unit, and detects a current therebetween. , The detection result by the first current monitoring unit and the detection result by the second current monitoring unit Zui it, characterized in that a power feeding switch control unit that performs connection switching of the first power switching unit and the second power switching unit.

  According to the present invention, when the power supply switching control unit has a normal detection result by the first current monitoring unit and a detection result by the second current monitoring unit is normal, The power switching unit switches so as to connect the power line of the working system line and the first power feeding unit, and the second power switching unit connects the power line of the standby system line and the second power feeding unit. When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is abnormal, the first power switching unit is switched to the active system. Switching so as to connect the power line of the line and the first power feeding unit, and switching the second power switching unit to connect the first transmission transformer and the second power feeding unit, The detection result by the current monitoring unit 1 is abnormal When the detection result by the second current monitoring unit is normal, the first power switching unit switches so as to connect the second transmission transformer and the first power feeding unit, and The second power switching unit switches so as to connect the first transmission transformer and the second power feeding unit, the detection result by the first current monitoring unit is abnormal, and the second current monitoring When the detection result by the unit is abnormal, the first power feeding unit and the second power feeding unit are instructed to stop power feeding.

  Further, the invention is characterized in that the sum of the power supplied from the first power supply unit and the power supplied from the second power supply unit is the maximum value of the value supplied to the counter circuit.

  According to the present invention, there is provided a PoE power supply circuit and a power supply method that reduce power consumption without causing instantaneous power supply interruption at the time of line switching of a power receiving side remote device in PoE power supply in a redundant Ethernet line configuration. be able to.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The present invention relates to a PoE power supply side device in a packet communication device that performs PoE power supply via an Ethernet duplex line without causing an instantaneous power interruption in the PoE power reception side device when switching to a protection line due to a failure of the working line or the like. It is characterized by providing a PoE power supply circuit capable of suppressing the power supply capacity of the same as that at the time of unification.

  FIG. 1 is a block diagram showing a configuration of an embodiment of a PoE power supply circuit according to the present invention, and shows a power supply switching configuration according to the present invention of a packet communication device that performs PoE power supply over an Ethernet duplex line. Since the power supply system is mainly described, data transmission and data flow from the remote device to the remote accommodation device are omitted.

  In this example, the remote accommodating device (1) and the remote device (2) are connected by Ethernet duplex using the # 0 twisted pair line (3) and the # 1 twisted pair line (4).

  The remote device (2) receives packet transmission from the host device (remote accommodating device (1)) via the Ethernet duplex line (# 0 twisted pair line (3) and # 1 twisted pair line (4)), and the own device The power is received by the PoE power feeding method.

  Also, in response to line duplication, a signal line and a power line are received from the host apparatus (remote accommodating apparatus (1)) via the # 0 twisted pair line (3) and the # 1 twisted pair line (4), and the # 0 twisted pair line ( 3) The power sum output of the A-system feed power drawn from the primary intermediate tap of the receiving transformer # 0 (21) and the B-system feed power directly received by the power line, respectively, with the feed power superimposed on the signal line of 3); The power sum of the power supply power superimposed on the signal line of the 1 twisted pair line (4) and the power supply power of the A system fed from the primary intermediate tap of the receiving transformer # 1 (22) and the B system power supply received directly by the power line. The output is based on the IEEE 802.3af specification that the power receiving device (remote device (2)) should support both the A method and the B method.

  Further, these two systems of power are summed via power sum circuits (23), (24), (25) and then supplied to the in-device power supply (26). This is a configuration for preventing an instantaneous power interruption when a failure such as a disconnection or a failure occurs on one side of the duplex line and a switching of the power system for supplying the line occurs on the power supply side.

  The remote accommodating device (1) exchanges data with the remote device (2) via the Ethernet duplex line (# 0 twisted pair line (3) and # 1 twisted pair line (4)), and further supplies PoE power. Supply power.

  As a PoE power supply unit for a pair of Ethernet duplex lines, a PoE power supply unit 0 (18) and a PoE power supply unit 1 (19) are provided. The PoE power supply 0 part (18) and the PoE power supply 1 part (19) each have a capability of outputting a DC voltage of 48V to a maximum DC power of 7.7W. This means that the current capacity is half of the maximum DC power of 15.4 W at a DC voltage of 48 V, which is the regulation of power supply capability to one port of the IEEE 802.3af Ethernet line (corresponding to one twisted pair in FIG. 1).

  On the power output side of the PoE power supply 0 part (18) and the PoE power supply 1 part (19), a current monitor 0 part (15) and a current monitor 1 part ( 16) Further, via the power switch 0 unit (13) and the power switch 1 unit (14), they are connected to the secondary intermediate taps of the transmission transformer # 0 (11) and the transmission transformer # 1 (12), respectively. .

  The load state on the power feeding side observed in the current monitoring 0 part (15) and the current monitoring 1 part (16) is the current line in the remote accommodation apparatus (1) or the standby line as the line feeding load 0 information and the line feeding load 1 information. This is input to the power supply switching control unit (17) together with the working protection line setting information indicating which line is being used.

  The active protection line setting information is stored in a storage unit (not shown) such as a memory for performing device control in the remote accommodation device (1).

  The power supply switching control unit (17) sets the switch node of the power switching 0 unit (13) to # 0A according to the logic shown in FIG. 2 based on the line power supply load 0 information, the line power supply load 1 information, and the working standby line setting information. Alternatively, it is switched to # 1B, and the switch node of the power switching unit 1 (14) is switched to # 1A or # 0B and set.

  The logic of FIG. 2 will be specifically described.

  The initial power supply states of the PoE power supply 0 part (18) and the PoE power supply 1 part (19) are respectively connected to # 0A and # 1A, and the PoE power supply A system defined by IEEE 802.3af is used.

  At this time, the power of PoE power supply 0 part (18) to 7.7 W and the power of PoE power supply 1 part (19) to 7.7 W are respectively intermediate between the secondary side of transmission transformer # 0 (11) and transmission transformer # 1 (12). The power is summed on the signal line via the tap, passed through the primary intermediate tap of the receiving transformer # 0 (21) and the receiving transformer # 1 (22) of the remote device (2), and then the power sum circuits (23), (24), ( 25) is summed to 15.4 W, and 15.4 W, which is the sum of both, is supplied to the in-device power supply unit (26). However, here, the power loss during power transmission is ignored.

  In this state, when a failure such as a failure or disconnection occurs in the line # 0 (3), the current monitor 0 unit (15) detects a power supply load abnormality (none) and transmits it to the power supply switching control unit (17). .

  In response to this change, the power supply switching control unit (17) switches the switch node of the power switching 0 unit (13) from # 0A to # 1B, and performs the A mode power supply of the line # 0 (3) to the line # 1 (4). Switch to B-type power supply.

  As a result, the 7.7 W power of the PoE power supply 0 unit (18) is transmitted to the remote device (2) via the power line of the # 1 twisted pair (4), and the primary side intermediate tap of the receiving transformer # 1 (22) The power is summed with the power 7.7 W from the PoE power supply 1 part (19) transmitted from, and supplied to the in-device power supply part (26).

  When a failure such as a failure or disconnection occurs in the line # 1 (4) in the initial power supply state described above, the current monitoring unit 1 (16) detects a power supply load abnormality (none), and the power supply switching control unit (17) Is transmitted to.

  In response to this change, the power feed switching control unit (17) switches the switch node of the power switch 1 unit (14) from # 1A to # 0B, and performs the A mode power feed of the line # 1 (4) to the line # 0 (3). Switch to B-type power supply.

  As a result, the power of 7.7 W of the PoE power supply 1 unit (19) is transmitted to the remote device (2) via the power line of the # 0 twisted pair (3) and is transmitted from the primary intermediate tap of the receiving transformer # 0 (21). The electric power is summed with 7.7 W from the transmitted PoE power supply 0 unit (18) and is supplied to the in-device power supply unit (26).

  Further, when a failure such as a failure or disconnection occurs in both the line # 0 (3) and the line # 1 (4) in each of the above-described states, the current monitor 0 unit (15) and the current monitor 1 unit ( 16) A power supply load abnormality (absence) is detected on both sides and transmitted to the power supply switching control unit (17).

  In response to this change, the power supply switching control unit (17) sets the switch node of the power switch 0 unit (13) to # 0A, the switch node of the power switch 1 unit (14) to # 1A, and PoE power supply 0 A power supply stop instruction is sent to both the unit (18) and the PoE power supply 1 unit (19).

  The PoE power supply 0 unit (18) and the PoE power supply unit 1 (19) that have received the instruction stop the internal circuit by cutting off the input power to the internal power supply circuit (not shown), and reduce the power consumption.

  The initial power supply states of the PoE power supply 0 part (18) and the PoE power supply 1 part (19) may be # 0B and # 1B instead of # 0A and # 1A, respectively. 3 shows.

  The only difference from FIG. 1 is that the internal switch node configurations of the power switching 0 unit (113) and the power switching 1 unit (114) are changed. The switching setting logic of the power switching 0 unit (113) and the power switching 1 unit (114) in this case is shown in FIG.

  In this example, the remote accommodating apparatus (101) and the remote apparatus (102) are connected in an Ethernet duplex manner by the # 0 twisted pair line (103) and the # 1 twisted pair line (104).

  The remote device (102) receives packet transmission from the host device (remote accommodating device (101)) via the Ethernet duplex line (# 0 twisted pair line (103) and # 1 twisted pair line (104)), and the own device The power is received by the PoE power feeding method.

  Also, in response to line duplication, a signal line and a power line are received from the host apparatus (remote accommodating apparatus (101)) via the # 0 twisted pair line (103) and the # 1 twisted pair line (104), and the # 0 twisted pair line ( 103) and the power sum output of the A-system feed power drawn from the primary intermediate tap of the receiving transformer # 0 (121) and the B-system feed power directly received by the power line, The power sum of the power supply power superimposed on the signal line of the 1 twisted pair line (104) and the power supply power of the A system fed from the primary intermediate tap of the receiving transformer # 1 (122) and the B system power supply received directly by the power line. The output is based on the IEEE 802.3af stipulation that the power receiving device (remote device (102)) should support both the A method and the B method.

  Further, these two systems of power are summed via power sum circuits (123), (124), (125) and then supplied to the in-device power supply (126). This is a configuration for preventing an instantaneous power interruption when a failure such as a disconnection or a failure occurs on one side of the duplex line and a switching of the power system for supplying the line occurs on the power supply side.

  The remote accommodating apparatus (101) exchanges data with the remote apparatus (102) via the Ethernet duplex line (# 0 twisted pair line (103) and # 1 twisted pair line (104)), and further supplies PoE power. Supply power.

  As a PoE power supply unit for a pair of Ethernet duplex lines, a PoE power supply unit 0 (118) and a PoE power supply unit 1 (119) are provided. Each of the PoE power supply 0 part (118) and the PoE power supply 1 part (119) has a capability of outputting a DC voltage of 48V to a maximum DC power of 7.7W. This means that the current capacity is half of the maximum DC power of 15.4 W at a DC voltage of 48 V, which is the regulation of power supply capability to one port of the IEEE 802.3af Ethernet line (corresponding to one twisted pair in FIG. 1).

  On the power output side of the PoE power supply 0 part (118) and the PoE power supply 1 part (119), a current monitor 0 part (115) and a current monitor 1 part (current capacity measuring meters for measuring the power supply side load, respectively) 116) are further connected to secondary intermediate taps of transmission transformer # 0 (111) and transmission transformer # 1 (112) via power switching 0 section (113) and power switching 1 section (114), respectively. .

  The load state on the power feeding side observed by the current monitor 0 unit (115) and the current monitor 1 unit (116) is the current line in the remote accommodation apparatus (101) or the standby line as the line power load 0 information and the line power load 1 information. This is input to the power supply switching control unit (117) together with the working protection line setting information indicating which of the lines is used.

  The active protection line setting information is stored in a storage unit (not shown) such as a memory for performing device control in the remote accommodating device (101).

  The power supply switching control unit (117) sets the switch node of the power switching 0 unit (113) to # 1A according to the logic shown in FIG. 4 based on the line power supply load 0 information, the line power supply load 1 information, and the working standby line setting information. Alternatively, it is switched to # 0B, and the switch node of the power switching unit 1 (114) is switched to # 1B or # 0A and set.

  The logic of FIG. 4 will be specifically described.

  The initial power supply states of the PoE power supply 0 part (118) and the PoE power supply 1 part (119) are connected to # 0B and # 1B, respectively, and are based on the PoE power supply B system defined by IEEE 802.3af.

  At this time, power of 7.7 W from the PoE power supply 0 part (118) and 7.7 W from the PoE power supply 1 part (119) is transmitted through the power lines, respectively, and the power sum circuits (123), (124), (125) are transmitted. And 15.4 W, which is the sum of both, is supplied to the in-device power supply unit (126). However, here, the power loss during power transmission is ignored.

  In this state, when a failure such as a failure or disconnection occurs in the line # 0 (103), the current monitor 0 unit (115) detects a power supply load abnormality (none) and transmits it to the power supply switching control unit (117). .

  In response to this change, the power supply switching control unit (117) switches the switch node of the power switching 0 unit (113) from # 0B to # 1A, and performs B-system power supply of the line # 0 (103) to the line # 1 (104). Switch to A-type power supply.

  As a result, the 7.7 W power of the PoE power supply 0 unit (118) is superimposed on the signal line of the # 1 twisted pair (104) and transmitted to the remote device (102), and is transmitted from the power line of the # 1 twisted pair (104). The power is summed with 7.7 W from the PoE power supply 1 part (119) and supplied to the in-device power supply part (126).

  When a failure such as a failure or disconnection occurs in the line # 1 (104) in the initial power supply state described above, the current monitoring unit 1 (116) detects a power supply load abnormality (none), and the power supply switching control unit (117). Is transmitted to.

  In response to this change, the power supply switching control unit (117) switches the switch node of the power switching unit 1 (114) from # 1B to # 0A, and performs the B-system power supply of the line # 1 (104) to the line # 0 (103). Switch to A-type power supply.

  As a result, the power of 7.7 W from the PoE power supply 1 unit (119) is transmitted to the remote device (102) by being superimposed on the signal line of the # 0 twisted pair (103) and transmitted from the power line of the # 0 twisted pair (103). The total power is 7.7 W from the PoE power supply 0 unit (118) and is supplied to the in-device power supply unit (126).

  Further, when a failure such as a failure or disconnection occurs in both the line # 0 (103) and the line # 1 (104) in each state described above, the current monitor 0 unit (115) and the current monitor 1 unit ( 116) A power supply load abnormality (absence) is detected on both sides and transmitted to the power supply switching control unit (117).

  In response to this change, the power supply switching control unit (117) sets the switch node of the power switch 0 unit (113) to # 0B, the switch node of the power switch 1 unit (114) to # 1B, and PoE power supply 0 The power supply stop instruction is sent to both the unit (118) and the PoE power supply unit 1 (119).

  The PoE power supply 0 unit (118) and the PoE power supply unit 1 (119) that have received the instruction stop the internal circuit by cutting off the input power to the internal power supply circuit (not shown) and reduce the power consumption.

  As described above, according to the present invention, when switching to a protection line due to a failure of the working line, the supply power is temporarily (instantaneously) halved without causing a power interruption at the PoE power receiving side device. In addition, the present invention is characterized by providing a low power circuit and a configuration method at the time of dual line PoE power supply capable of suppressing the power supply capacity of the PoE power supply side device to be equal to that at the time of single connection.

  Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

It is a block diagram which shows the structure of one Embodiment of the PoE electric power feeding circuit by this invention. It is a table | surface figure which shows the logic regarding the switching of the electric power switching 0 part (13) and the electric power switching 1 part (14) by the electric power feeding switching control part (17) of the PoE electric power feeding circuit shown in FIG. It is a block diagram which shows the structure of embodiment different from FIG. 1 of the PoE electric power feeding circuit by this invention. It is a table | surface figure which shows the logic regarding the switching of the electric power switching 0 part (113) and the electric power switching 1 part (114) by the electric power feeding switching control part (117) of the PoE electric power feeding circuit shown in FIG. It is a figure which shows the example of the conventional electric power feeding structure of the packet communication apparatus which performs PoE electric power feeding via an Ethernet duplex line. It is a figure which shows another conventional electric power feeding structural example of the packet communication apparatus which performs PoE electric power feeding via an Ethernet duplex line.

Explanation of symbols

1 Remote accommodating device 2 Remote device 3 # 0 twisted pair wire 4 # 1 twisted pair wire 11 Transmitting transformer # 0
12 Transmitting transformer # 1
13 Power Switch 0 Unit 14 Power Switch 1 Unit 15 Current Monitor 0 Unit 16 Current Monitor 1 Unit 17 Power Supply Switch Control Unit 18 PoE Power Supply 0 Unit 19 PoE Power Supply 1 Unit 21 Receiving Transformer # 0
22 Receiving transformer # 1
23, 24, 25 Power sum circuit 26 In-device power supply

Claims (13)

The working line has a signal line and a power line, the protection line has a signal line and a power line, the signal line of the working line, the power line of the working line, the signal line of the protection line and the protection line In the power feeding circuit that feeds power to the circuit opposite to the circuit through one of the power lines of the circuit,
Power supply means for supplying power using any two of the signal line of the working system line, the power line of the working system line, the signal line of the protection system line and the power line of the protection system line ,
The feeding means, the feeding circuit characterized that you have a switching means to switch between the two lines to perform the feeding. A first power feeding unit that feeds power to one of the two wires that feed the power;
The power supply circuit according to claim 1, further comprising: a second power supply unit that supplies power to the other of the two lines that perform power supply. A first transmission transformer that superimposes power on the signal line of the working line;
A second transmission transformer that superimposes power on the signal line of the standby line;
A first power switching unit that switches a connection between the first transmission transformer and the first power feeding unit and a connection between a power line of the standby line and the first power feeding unit;
A second power switching unit that switches a connection between the second transmission transformer and the second power feeding unit and a connection between the power line of the working line and the second power feeding unit;
A first current monitoring unit that is provided between the first power feeding unit and the first switching unit and detects a current therebetween;
A second current monitoring unit that is provided between the second power feeding unit and the second switching unit and detects a current therebetween;
A power supply switching control unit configured to switch connection between the first power switching unit and the second power switching unit based on a detection result by the first current monitoring unit and a detection result by the second current monitoring unit; The power feeding circuit according to claim 2 , wherein the power feeding circuit is provided. The power supply switching control unit,
When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is normal, the first power switching unit is connected to the first transmission transformer and the Switching to connect the first power feeding unit, and switching the second power switching unit to connect the second transmission transformer and the second power feeding unit,
When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is abnormal, the first power switching unit is connected to the first transmission transformer and the Switching to connect the first power supply unit, and switching the second power switching unit to connect the power line of the working line and the second power supply unit,
When the detection result by the first current monitoring unit is abnormal and the detection result by the second current monitoring unit is normal, the first power switching unit is connected to the power line of the standby line and the power line. Switching to connect the first power feeding unit, and switching the second power switching unit to connect the second transmission transformer and the second power feeding unit,
When the detection result by the first current monitoring unit is abnormal and the detection result by the second current monitoring unit is abnormal, the first power feeding unit and the second power feeding unit Instructing to stop feeding,
The power feeding circuit according to claim 3 , wherein the power feeding circuit is controlled as follows. A first transmission transformer that superimposes power on the signal line of the working line;
A second transmission transformer that superimposes power on the signal line of the standby line;
A first power switching unit that switches a connection between the second transmission transformer and the first power feeding unit and a connection between the power line of the working line and the first power feeding unit;
A second power switching unit that switches a connection between the first transmission transformer and the second power feeding unit, and a connection between the power line of the standby line and the second power feeding unit;
A first current monitoring unit that is provided between the first power feeding unit and the first switching unit and detects a current therebetween;
A second current monitoring unit that is provided between the second power feeding unit and the second switching unit and detects a current therebetween;
A power supply switching control unit configured to switch connection between the first power switching unit and the second power switching unit based on a detection result by the first current monitoring unit and a detection result by the second current monitoring unit; The power feeding circuit according to claim 2 , wherein the power feeding circuit is provided. The power supply switching control unit,
When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is normal, the first power switching unit is connected to the power line of the working line and the Switching to connect the first power supply unit, and switching the second power switching unit to connect the power line of the standby line and the second power supply unit,
When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is abnormal, the first power switching unit connects the power line of the working line and the Switching to connect the first power feeding unit, and switching the second power switching unit to connect the first transmission transformer and the second power feeding unit,
When the detection result by the first current monitoring unit is abnormal and the detection result by the second current monitoring unit is normal, the first power switching unit is connected to the second transmission transformer and the second transmission transformer. Switching to connect the first power feeding unit, and switching the second power switching unit to connect the first transmission transformer and the second power feeding unit,
When the detection result by the first current monitoring unit is abnormal and the detection result by the second current monitoring unit is abnormal, the first power feeding unit and the second power feeding unit Instructing to stop feeding,
The power feeding circuit according to claim 5 , wherein the feeding circuit is controlled as follows. Any of claims 2 to 6, characterized in that the sum of said first feeding power by said second feeding unit and the feeding power from the feeding section is the maximum value of the values to power the opposing circuit 1 The power supply circuit according to item. The working line has a signal line and a power line, the protection line has a signal line and a power line, the signal line of the working line, the power line of the working line, the signal line of the protection line and the protection line In a PoE power feeding method in which power is fed through one of the power lines of the line,
Power is fed using any two lines of the working line signal line, the working line power line, the protection line signal line, and the protection line power line , and the feeding A power feeding method characterized in that two lines to be performed can be switched . A first power supply unit that supplies power to one of the two lines that perform the power supply;
A second power supply unit that supplies power to the other of the two lines that supply power;
A first transmission transformer that superimposes power on the signal line of the working line;
A second transmission transformer that superimposes power on the signal line of the standby line;
A first power switching unit that switches a connection between the first transmission transformer and the first power feeding unit and a connection between a power line of the standby line and the first power feeding unit;
A second power switching unit that switches a connection between the second transmission transformer and the second power feeding unit and a connection between the power line of the working line and the second power feeding unit;
A first current monitoring unit that is provided between the first power feeding unit and the first switching unit and detects a current therebetween;
A second current monitoring unit that is provided between the second power feeding unit and the second switching unit and detects a current therebetween;
The connection switching of the first power switching unit and the second power switching unit is performed based on a detection result by the first current monitoring unit and a detection result by the second current monitoring unit. Item 9. The power feeding method according to Item 8 . When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is normal, the first power switching unit is connected to the first transmission transformer and the Switching to connect the first power feeding unit, and switching the second power switching unit to connect the second transmission transformer and the second power feeding unit,
When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is abnormal, the first power switching unit is connected to the first transmission transformer and the Switching to connect the first power supply unit, and switching the second power switching unit to connect the power line of the working line and the second power supply unit,
When the detection result by the first current monitoring unit is abnormal and the detection result by the second current monitoring unit is normal, the first power switching unit is connected to the power line of the standby line and the power line. Switching to connect the first power feeding unit, and switching the second power switching unit to connect the second transmission transformer and the second power feeding unit,
When the detection result by the first current monitoring unit is abnormal and the detection result by the second current monitoring unit is abnormal, the first power feeding unit and the second power feeding unit Instructing to stop feeding,
The power feeding method according to claim 9 , wherein control is performed as follows. A first transmission transformer that superimposes power on the signal line of the working line;
A second transmission transformer that superimposes power on the signal line of the standby line;
A first power switching unit that switches a connection between the second transmission transformer and the first power feeding unit and a connection between the power line of the working line and the first power feeding unit;
A second power switching unit that switches a connection between the first transmission transformer and the second power feeding unit, and a connection between the power line of the standby line and the second power feeding unit;
A first current monitoring unit that is provided between the first power feeding unit and the first switching unit and detects a current therebetween;
A second current monitoring unit that is provided between the second power feeding unit and the second switching unit and detects a current therebetween;
The connection switching of the first power switching unit and the second power switching unit is performed based on a detection result by the first current monitoring unit and a detection result by the second current monitoring unit. Item 9. The power feeding method according to Item 8 . When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is normal, the first power switching unit is connected to the power line of the working line and the Switching to connect the first power supply unit, and switching the second power switching unit to connect the power line of the standby line and the second power supply unit,
When the detection result by the first current monitoring unit is normal and the detection result by the second current monitoring unit is abnormal, the first power switching unit connects the power line of the working line and the Switching to connect the first power feeding unit, and switching the second power switching unit to connect the first transmission transformer and the second power feeding unit,
When the detection result by the first current monitoring unit is abnormal and the detection result by the second current monitoring unit is normal, the first power switching unit is connected to the second transmission transformer and the second transmission transformer. Switching to connect the first power feeding unit, and switching the second power switching unit to connect the first transmission transformer and the second power feeding unit,
When the detection result by the first current monitoring unit is abnormal and the detection result by the second current monitoring unit is abnormal, the first power feeding unit and the second power feeding unit Instructing to stop feeding,
The power feeding method according to claim 11 . Power supply method according to any one of claims 8 to 12, wherein the sum of the supply power by two lines for performing the power supply is the maximum value of the values to power the opposing circuit.

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