JP4990210B2 - Power supply / reception device - Google Patents

Description

  The present invention relates to a power supply / reception device that receives and supplies power using a network cable such as Power over Ethernet (PoE).

  As a technique for receiving and supplying power via a network cable, for example, there is one disclosed in Patent Document 1. The power supply / reception device described in Patent Literature 1 includes a power reception terminal that receives power from a network cable, a power reception terminal that receives power from a separate adapter power supply, and a power supply terminal that supplies power to a lower power reception terminal. In this power supply / reception device, either one of the two power reception terminals is selected, and the power supplied to the selected power reception terminal is received as power for the own terminal, and the power supplied to the other power reception terminal is subordinated Supply to the receiving terminal.

JP 2006-203730 A

  A conventional power supply / reception device includes a power reception dedicated connector corresponding to the power reception terminal and a power supply dedicated connector corresponding to the power supply terminal. In this way, if there are separate connectors dedicated for power reception and power supply, there is a possibility that when connecting to the power supply side or power reception side device, the connector may be misconnected, resulting in failure, malfunction, or operation stop of the device. There was a problem.

  The present invention has been made to solve the above-described problems. By determining whether a device connected to the own device is a power receiving side or a power feeding side, the connector is fixed to the power receiving side and the power feeding side only. An object of the present invention is to obtain a power supply / reception device that can receive and supply power without any problem.

  The power supply / reception device according to the present invention includes a power supply / reception terminal connected to a network cable, a power reception unit that receives power supplied from the power supply device connected to the network cable via the power supply / reception terminal, and the network cable. Based on the output contents of the power supply unit that supplies power to the power receiving device to be connected via the power supply / reception terminal and the external device connected to the network cable, whether the external device is the power supply device or the power receiving device. The determination unit includes a determination unit, and a selector unit that switches between power reception by the power reception unit and power supply by the power supply unit in accordance with an instruction from the determination unit based on the determination result.

  According to the present invention, the power supply / reception terminal connected to the network cable is provided, and the determination unit determines whether the external device is the power supply device or the power reception device based on the output content of the external device connected to the network cable. The selector unit switches between power reception by the power reception unit and power supply by the power supply unit based on the determination result. By checking the external device connected to the network cable via the connector that is the power supply / reception terminal in this way, it is not necessary to distinguish between the power reception dedicated connector and the power supply dedicated connector, and the cable can be used as a connector regardless of the power reception device or power supply device. Can be connected. Thereby, there is an effect that it is possible to prevent the occurrence of malfunction or malfunction of the apparatus due to erroneous connection of the connector, or stop of the operation of the apparatus.

Embodiment 1 FIG.
1 is a block diagram showing a configuration of a power supply / reception device according to Embodiment 1 of the present invention. In FIG. 1, a power supply / reception device 22 according to Embodiment 1 is a device that performs PoE (Power over Ethernet (registered trademark)) processing for receiving and supplying power via an Ethernet (registered trademark) cable. A transformer 13, a data transmission / reception unit 14, a device internal processing unit 15, a determination unit 16, a selector unit 17, a power receiving unit 18, a power feeding unit 19, a DC / DC unit 20, and an in-device power source 21.

  The connectors (power supply / reception terminals) 11 and 12 are PoE-compatible RJ-45 connectors, each of which is connected to a network to transmit network data (with power superposition) e. Further, in connectors 11 and 12, a transformer 13 is connected to a terminal connected to a signal line through which network data (without power superposition) f in the cable is transmitted, and is used for a signal line (PoE) through which power is propagated. The determination unit 16 and the selector unit 17 are connected to the terminals connected to the pair).

  As a result, the network data e propagated through the Ethernet cable is separated from the network data f and power at the connectors 11 and 12, and the network data f is input to the transformer 13, and the power is determined by the determination unit 16 and the selector unit. 17 is input.

  The transformer 13 is a pulse transformer that electrically separates the network data f into a primary side and a secondary side, and insulates the network data f between transmitting and receiving devices. The data transmission / reception unit 14 is an Ethernet (registered trademark) unit that transmits / receives data via an Ethernet cable, and transmits / receives network data f via the transformer 13. The apparatus internal processing unit 15 processes the network data f input via the data transmission / reception unit 14 and outputs the data generated by the processing to the data transmission / reception unit 14 as network data f.

  The determination unit 16 is a component that determines the PoE process. The determination unit 16 determines whether the own device 22 is receiving power from one of the connectors 11 and 12 based on the PoE information sharing data d. 12, it is determined whether the device connected via 12 is a power receiving side device or a power feeding side device. For example, the determination unit 16 connected to the connector 11 and the determination unit 16 connected to the connector 12 store their own power supply / reception information as PoE information sharing data d, and periodically store each other's PoE information sharing data d. , It is determined whether or not power is received from another device (power is supplied from the other device) via the connector 11 or the connector 12.

  The PoE information sharing data d may be stored periodically in a dual port memory in which contents can be read from both the determination unit 16 connected to the connector 11 and the determination unit 16 connected to the connector 12. Good. Further, the determination unit 16 connected to the connector 11 and the determination unit 16 connected to the connector 12 notify each other and determine that there has been a change in their own state (PoE power reception via the connector to which they are connected). It doesn't matter if you do.

  The selector unit 17 operates one of the power receiving unit 18 and the power feeding unit 19 in accordance with an instruction by the selector selection signal c from the determination unit 16. The power receiving unit 18 is a component that performs PoE power reception, and is operated by the selector unit 17 when an external device connected to one of the connectors 11 and 12 is a power supply device that supplies power with PoE. The PoE power supply voltage b received from the external device is output to the DC / DC unit 20.

  The power supply unit 19 is a component that performs PoE power supply. An external device connected to one of the connectors 11 and 12 receives power through a power receiving device (PoE compatible device) that receives power through PoE, or via a network cable. In the case of a PoE non-compliant device that does not perform power supply, it is operated by the selector unit 17 to supply power using the PoE power supply voltage a from the DC / DC unit 20.

  The DC / DC unit 20 converts the PoE received power supply voltage b from the power receiving unit 18 into a voltage used in each configuration in the device 22 and outputs it to the in-device power supply 21, and from either one of the connectors 11 and 12. The supplied power is converted into a PoE power supply voltage a and output to the power supply unit 19. The in-device power supply 21 distributes the voltage converted from the PoE received power supply voltage b by the DC / DC unit 20 to each component in the device 22.

Next, the operation will be described.
FIG. 2 is a flowchart showing the flow of operation by the power supply / reception device in FIG. 1, and details of the processing will be described with reference to this figure.
First, at a stage before the Ethernet cable is connected to either of the connectors 11 and 12, the determination unit 16 connected to the connector 11 and the determination unit 16 connected to the connector 12 have their own power supply / reception information ( The PoE information sharing data d) is stored as PoE information sharing data d, and the PoE information sharing data d is periodically transmitted and received.

  Based on the PoE information sharing data d, each determination unit 16 receives power from its own device 22 from an external device via PoE via the connector 11 or the connector 12 (power is supplied from the external device via another connector). Is determined (step ST11). Whether or not power is being received by PoE is determined based on whether or not a power supply voltage is detected via the connector.

  In step ST11, when the determination unit 16 determines that the own device 22 is receiving power from the external device via the other connector that is not connected to itself (Yes), the determination unit 16 is connected to the connector to which the determination unit 16 is connected via the Ethernet cable. A power receiving device is connected, and a selector selection signal c for instructing to operate the power supply unit 19 is output to the selector unit 17 (step ST13). In this way, when the power supply / reception device 22 according to the first embodiment has already received power from the external device via one of the connectors 11 and 12, the power supply / transmission device 22 proceeds to the power supply processing via the other connector.

  The selector unit 17 operates the power supply unit 19 in accordance with an instruction from the determination unit 16. The power supply unit 19 supplies power via the connector with the PoE power supply voltage a from the DC / DC unit 20 (step ST14). For example, when a power receiving device is connected to the other connector to which the determination unit 16 is not connected via an Ethernet cable and PoE power reception is requested from the power reception device via the cable, the determination unit 16 causes the selector unit 17 to The power supply unit 19 is operated to perform power supply processing via the cable.

  On the other hand, when the determination unit 16 determines in step ST11 that the own device 22 is not receiving power from the external device (power supply device) via the other connector that is not connected to itself (no power is supplied from the external device) ( No) When an Ethernet cable is connected to the connector to which it is connected, it is detected whether or not a power supply voltage for power supply is transmitted from an external device via this cable (step ST12).

  Here, when the external device connected to the cable is a power supply device, and the power supply voltage for power supply is propagated from the external device (Yes), the determination unit 16 instructs the power reception unit 18 to operate. The selection signal c is output to the selector unit 17 (step ST15). The selector unit 17 operates the power receiving unit 18 in accordance with an instruction from the determination unit 16.

  The power receiving unit 18 receives the power supply voltage for power supply from the external device detected in step ST <b> 14 as the PoE received power supply voltage b and outputs it to the DC / DC unit 20. The DC / DC unit 20 converts the PoE received power supply voltage b from the power receiving unit 18 into a voltage used in each component in the device 22 and outputs it to the in-device power supply 21. The in-device power supply 21 distributes the voltage converted from the PoE received power supply voltage b by the DC / DC unit 20 to each component in the device 22 (step ST16).

  Further, when the power supply voltage for power supply is not detected in step ST12 (No), since the power supply cannot be received originally, the subsequent processes (step ST13 and step ST14) do not operate. However, when power is supplied from an external power source (external power source) to the device 22 other than the connectors 11 and 12 (other than PoE), the processing of step ST13 and step ST14 is performed in the same manner as described above. Can do. In the following, processing when power is supplied from an external power source instead of PoE (that is, not via the connectors 11 and 12) will be described.

  If power is supplied from an external power source instead of PoE, and the power supply voltage for power supply by PoE is not detected in step ST12, the determination unit 16 outputs a selector selection signal c for instructing to operate the power supply unit 19 to the selector unit. 17 (step ST13). The selector unit 17 operates the power supply unit 19 in accordance with an instruction from the determination unit 16.

  In the power supply unit 19, the DC / DC unit 20 converts power from the external power source into a PoE power supply voltage a, and power is supplied through the other connector with the PoE power supply voltage a ( Step ST14).

  In addition, when the power supply / reception device 22 is operating by power supply from an external power source, the determination unit 16 performs power supply by PoE via the connectors 11 and 12 in step ST11 in order to prevent redundant power supply. If not, it is determined as such, and if power is supplied by PoE from either one of the connectors 11 and 12, the processing of step ST13 and step ST14 is executed to perform power supply by PoE.

  As described above, the setting information for power supply / reception by PoE is processed by sharing data between the determination units 16 connected to the connectors 11 and 12, so that each state (PoE power reception / power supply by PoE) is processed as PoE information sharing data d. Status).

  As described above, according to the first embodiment, the connectors 11 and 12 connected to the network cable are provided, and the determination unit 16 supplies power to the external device based on the output contents of the external device connected to the network cable. It is determined whether the device is a power receiving device or a power receiving device, and the selector unit 17 switches between power reception by the power receiving unit 18 and power feeding by the power feeding unit 19 based on the determination result. With this configuration, when a PoE-compatible device is connected to the power supply / reception device 22, the power reception process and the power supply process can be realized by the control of the determination unit 16 regardless of which of the connector 11 and the connector 12 is connected. In addition, the connector is not dedicated to either power reception or power supply, and the occurrence of malfunctions or malfunctions of the device due to erroneous connection of the connector, or stoppage of the operation of the device can be reduced. As a result, the life of the power supply / reception device 22 can be extended.

Embodiment 2. FIG.
FIG. 3 is a block diagram showing a configuration of a power supply / reception device according to Embodiment 2 of the present invention. In FIG. 3, the power supply / reception device 22 according to the second embodiment includes a power selector 23 in addition to the configuration shown in FIG. 1 of the first embodiment, and further includes a connector 11 instead of the determination units 16 and 16. , 12 is provided with a determination unit 16a connected to both. In FIG. 3, the same components as those in FIG.

  The determination unit 16a is a component that determines PoE processing. The connectors 11 and 12 are not independent, but the power supply states of both PoEs are determined simultaneously, and the selector selection signal c corresponding to the determination result is sent to the selector unit 17. Output to. Further, the determination unit 16a receives a power selector control signal g for instructing selection of the PoE received power supply voltage b from the power receiving unit 18 when the interruption of power supply by PoE through the connectors 11 and 12 is detected. To the unit 23.

  Based on the power selector control signal g from the determination unit 16 a, the power selector unit 23 selects the PoE received power supply voltage b from any of the power receiving units 18 and outputs the received power to the DC / DC unit 20. Note that the power supply voltages supplied from the connectors 11 and 12 do not become the same voltage due to the wiring and the capacity of the power supply source. For this reason, in the second embodiment, the PoE received power supply voltage b from one of the power receiving units 18 is selected and used.

Next, the operation will be described.
FIG. 4 is a flowchart showing a flow of operation by the power supply / reception device in FIG. 3, and details of the processing will be described with reference to this figure.
First, the determination unit 16a determines whether an external device connected via the connectors 11 and 12 is a PoE power receiving device based on whether or not a power reception request via the connectors 11 and 12 is detected or whether a power supply voltage is detected. It is grasped as a PoE type whether it is a device. Here, for the sake of simplicity of explanation, a case where both external devices connected via the connectors 11 and 12 are power feeding devices will be described as an example. When all the external devices are power supply devices, the external device connected to the device 22 first receives power with priority.

  Under the above assumption, the determination unit 16a monitors the power supply state by PoE through one of the connectors 11 and 12 (step ST21). If the power supply state continues (Yes), that is, if the power supply voltage by PoE is detected, the monitoring process is continued.

  Further, when the interruption of the power supply is detected (No), that is, when the power supply voltage at PoE is not detected, the determination unit 16a receives the power at PoE at the other connector so that the other connector can receive power at PoE. The selector selection signal c for instructing to operate is output to the selector unit 17 (step ST22). The selector unit 17 operates the power receiving unit 18 in accordance with an instruction from the determination unit 16. The power receiving unit 18 receives a power supply voltage for power supply from an external device as a PoE power supply voltage b (step ST23).

  Subsequently, the determination unit 16a outputs, to the power selector 23, a power selector control signal g instructing to select the power supply voltage received on the connector side to which an external device capable of supplying power is connected (step ST24). . As a result, the power selector 23 receives the PoE power supply voltage b received by the power receiver 18 and outputs it to the DC / DC unit 20.

  The DC / DC unit 20 converts the PoE received power source voltage b from the power source selector unit 23 into a voltage used in each component in the device 22 and outputs it to the in-device power source 21. The in-device power supply 21 distributes the voltage converted from the PoE received power supply voltage b by the DC / DC unit 20 to each component in the device 22.

  As described above, according to the second embodiment, when the determination unit 16a detects the supply stop of power to be received by the power reception unit 18 from the output contents of the external device in the connectors 11 and 12, the power supply stop is performed. Power supply / reception is switched so as to receive power from an external device connected to a connector other than the detected connector. By configuring in this way, even when an external device capable of supplying power through PoE is connected to the two connectors 11 and 12, even if the power supply through one connector is interrupted for some reason, the connector 11, The power supply can be received from the other power supply apparatus without changing the connection state with the external device via 12, and the power supply can be duplicated easily.

  In addition, since it is not necessary to replace the cable when the power is cut off, it is possible to reduce the occurrence of malfunctions such as failure or malfunction of the apparatus due to erroneous connection of the cable to the connector, or stop of the operation of the apparatus. As a result, the life of the power supply / reception device 22 can be extended.

It is a block diagram which shows the structure of the power supply / reception apparatus by Embodiment 1 of this invention. It is a flowchart which shows the flow of operation | movement by the power supply / reception apparatus in FIG. It is a block diagram which shows the structure of the power feeding / receiving apparatus by Embodiment 2 of this invention. It is a flowchart which shows the flow of operation | movement by the power feeding / receiving apparatus in FIG.

Explanation of symbols

  11, 12 connector (power supply / reception terminal), 13 transformer, 14 data transmission / reception unit, 15 device internal processing unit, 16, 16a determination unit, 17 selector unit, 18 power reception unit, 19 power supply unit, 20 DC / DC unit, 21 device Internal power supply, 22 power supply / reception device, 23 power selector section.

Claims (5)

Power supply / reception terminal connected to the network cable;
A power receiving unit that receives power supplied from the power supply device connected to the network cable via the power supply / reception terminal;
A power feeding unit that feeds power to the power receiving device connected to the network cable via the power supply / reception terminal;
A determination unit that determines whether the external device is a power feeding device or a power receiving device based on the output content of the external device connected to the network cable;
A power supply / reception device including a selector unit that switches between power reception by the power reception unit and power supply by the power supply unit in accordance with an instruction from the determination unit based on the determination result.   The power supply / reception device according to claim 1, wherein the determination unit determines whether the external device is a power supply device or a power reception device based on whether or not the power supply for power supply from the external device is output. It has multiple power supply / reception terminals,
When the power receiving unit is receiving power via any of the plurality of power receiving / feeding terminals, the determination unit is configured to supply power via a power receiving / feeding terminal other than the power receiving / feeding terminal used by the power receiving unit. The power supply / reception device according to claim 1, wherein switching of power reception / power supply by the selector unit is controlled.   When the determination unit detects the supply stop of the power to be received by the power reception unit from the output content of the external device at the power supply / reception terminal, from the external device connected to the power supply / reception terminal other than the power supply / reception terminal where the power supply stop is detected The power supply / reception device according to claim 3, wherein switching of power reception / reception by the selector unit is controlled so as to receive power.   5. The power supply / reception device according to claim 1, wherein the determination unit operates with electric power supplied from an external power source without passing through the power supply / reception terminal.

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