JP2015104288A - Power reception/supply device and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve user convenience in supplying power to a power reception/supply device that receives/supplies power via a communication cable.SOLUTION: A power reception/supply device includes: a first power reception unit that receives power supply via a first terminal from an external power supply device connected by a communication cable; a second power reception unit that receives power supply via a second terminal from the external power supply device connected by the communication cable; a power supply unit that supplies power to the outside via the second terminal, on the basis of the power supplied to the first power reception unit; a switching unit that connects the second terminal to either one of the second power reception unit and power supply unit. The switching unit uses a state of connecting the second terminal to the second power reception unit as an initial state, operates by power supplied to at least one of the first power reception unit and second power reception unit, and controls, when detecting that power is being supplied to the first power reception unit, the connection state of the switching unit so as to connect the second terminal to the power supply unit.

Description

  The present invention relates to a power supply / reception device and a control method, and particularly to a power supply / reception device that receives and supplies power via a communication cable.

  2. Description of the Related Art In recent years, a power supply / reception device that receives and supplies power via a communication cable using PoE (Power over Ethernet (registered trademark)) is used in network devices such as a Web camera, a network hub, and a wireless LAN access point. PoE is a technology for supplying power via an Ethernet (registered trademark) communication cable, and a communication cable connected for network communication without using a dedicated power cable for receiving power supply. Can be used to operate the network device as described above.

  Such a power supply / reception device is connected to a power reception side terminal to which a communication cable for outputting power is connected to a power reception circuit to which power is supplied and a communication cable for outputting power from a power supply circuit to supply power. Provided with a power supply side terminal. In other words, power is supplied to the power supply / reception device by connecting a communication cable connected to an external power supply device having a power supply function such as a network hub to the power reception side terminal of the power reception / power supply device. Further, power is supplied from the power supply / reception device to the external power reception device by connecting the communication cable connected to the external power reception device corresponding to PoE to the power supply side terminal of the power supply / reception device.

  In addition, as described above, the power receiving side terminal and the power feeding side terminal are not distinguished from each other, the determination unit that is supplied with power by an external power cable different from the PoE power receiving circuit, and the communication cable connected to the terminal is external A circuit that determines which of the power supply device and the power reception device is connected and the selector unit to which power is supplied by the power cable flows between the terminal to which the communication cable is connected according to the determination result Has been proposed (see, for example, Patent Document 1).

  Since such a power receiving side terminal and a power feeding side terminal are both terminals for connecting a communication cable and have the same shape (for example, RJ-45), they are apparently indistinguishable. Therefore, the user is less likely to notice that the communication cable connected to the power supply device is incorrectly connected to the power supply side terminal of the power supply / reception device, and the power supply / reception device may remain inoperable. User convenience when supplying is poor.

  On the other hand, according to the technique disclosed in Patent Document 1, it is not necessary to distinguish between the power receiving side terminal and the power feeding side terminal, but an external power cable is separately required to operate the determination unit and the selector unit. The merit of using PoE is lost, and the convenience of the user when power is supplied to the power supply / reception device is also deteriorated.

  SUMMARY An advantage of some aspects of the invention is to improve convenience for a user when supplying power to a power supply / reception device that receives and supplies power via a communication cable.

  In order to solve the above-described problem, one embodiment of the present invention is a power supply / reception device that receives and supplies power via a communication cable. The power is supplied from an external power supply device connected by the communication cable via a first terminal. A first power receiving unit that receives power supply, a second power receiving unit that receives power supply from an external power supply device connected by a communication cable via a second terminal, and the first power receiving unit. And a switching unit that connects the second terminal to one of the second power receiving unit and the power feeding unit. A switching control unit that operates by power supplied to at least one of the first power receiving unit and the second power receiving unit and controls a connection state of the switching unit, and the switching unit includes Connect the second terminal to the second power receiving unit When the state is set to an initial state and the switching control unit detects that power is supplied to the first power receiving unit, the switching unit is configured to connect the second terminal to the power feeding unit. The connection state is controlled.

  According to another aspect of the present invention, there is provided a method for controlling a power supply / reception device that receives and supplies power via a communication cable, wherein the power supply / reception device receives a first terminal from an external power supply device connected by the communication cable. A first power receiving unit that receives power supply via a first power receiving unit, a second power receiving unit that receives power supply from an external power supply device connected by a communication cable via a second terminal, and the first power receiving unit Based on the power supplied to the power receiving unit, a power feeding unit that supplies power to the outside via the second terminal, and the second terminal is connected to one of the second power receiving unit and the power feeding unit A switching unit that performs the initial state of connecting the second terminal to the second power receiving unit, and at least one of the first power receiving unit and the second power receiving unit. Operating with the power supplied to the first When it is detected that the power is being supplied to the power receiving unit, and controls the connection state of the switching unit to connect the second terminal to the power source.

  ADVANTAGE OF THE INVENTION According to this invention, the convenience of the user at the time of supplying electric power to the power supply / reception apparatus which receives and supplies power via a communication cable can be improved.

It is a block diagram which shows the structure of the power supply / reception apparatus which concerns on embodiment of this invention. It is a block diagram which shows the control structure of the control part which concerns on embodiment of this invention. It is a flowchart which shows the control processing by the control part which concerns on embodiment of this invention. It is a figure which shows the flow of an electric current when a power feeding apparatus is connected to the power receiving side terminal of the power feeding / receiving apparatus which concerns on embodiment of this invention. It is a figure which shows the flow of an electric current when a electric power feeder is connected to the electric power feeding side terminal of the power receiving and feeding apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the power supply / reception apparatus which concerns on embodiment of this invention. It is a block diagram which shows the control structure of the control part which concerns on embodiment of this invention. It is a flowchart which shows the control processing by the control part which concerns on embodiment of this invention. It is a figure which shows the flow of an electric current when a power feeding apparatus is connected to the 1st terminal of the power feeding / receiving apparatus which concerns on embodiment of this invention. It is a figure which shows the flow of an electric current when a power feeding apparatus is connected to the 2nd terminal of the power feeding / receiving apparatus which concerns on embodiment of this invention.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. In the first embodiment, a power supply / reception device that receives and supplies power via a communication cable using PoE will be described.

  FIG. 1 is a block diagram illustrating the configuration of a power supply / reception device 1 according to this embodiment. As shown in FIG. 1, the power supply / reception device 1 according to this embodiment includes a first terminal 101, a second terminal 102, insulation units 103 and 104, a data transmission / reception unit 105, a first power reception circuit 120, a second Power receiving circuit 130, power feeding circuit 106, switching unit 107, notification unit 108, and control unit 100. The power reception circuit 120 includes a PD (Power Device) detection circuit 121, a power reception control circuit 122, and a DC (Direct Current) / DC power supply circuit 123. The second power reception circuit 130 includes a PD detection circuit 131, a power reception control circuit. 132 and a DC / DC power supply circuit 133.

  The first terminal 101 and the second terminal 102 are PoE compatible connectors (for example, RJ-45) for connecting a communication cable for inputting / outputting power together with transmission / reception of communication data. The first terminal 101 outputs the communication data received via the connected communication cable to the insulating unit 103, and supplies the power input via the connected communication cable to the PD detection circuit 121. Output. That is, the first terminal 101 is a power receiving side terminal that outputs the power input via the communication cable to the first power receiving circuit (power receiving unit) 120 (hereinafter, the first terminal 101 in the present embodiment). Is the power receiving side terminal 101).

  The second terminal 102 outputs communication data received via the connected communication cable to the insulating unit 104, and when the switching unit 107 described later is switched to the power feeding circuit 106 side, the power feeding circuit The power input from 106 is output via the connected communication cable. In other words, the second terminal 102 is a power supply side terminal that outputs the power input from the power supply circuit 106 via the connected communication cable (hereinafter, the second terminal 102 is supplied with power in the present embodiment). Side terminal 102).

  Note that the external power feeding device and the external power receiving device are connected to the power receiving side terminal 101 and the power feeding side terminal 102 via the communication cable, but the state where both are connected via the communication cable is simply “power receiving side”. It is described as “a power feeding device connected to the terminal 101”, “a power receiving device connected to the power feeding side terminal 102”, or the like.

  The insulating unit 103 is a pulse transformer that transmits and receives communication data in an insulated state between the power receiving side terminal 101 and the data transmitting / receiving unit 105. The insulating unit 104 is a pulse transformer that transmits and receives communication data in an insulated state between the power supply side terminal 102 and the data transmitting / receiving unit 105.

  The data transmission / reception unit 105 operates when power is supplied from a DC / DC power supply circuit 123 (described later), and performs communication data transmitted via the insulation units 103 and 104 to perform various processes in the device (not shown). Send to the processing unit. Further, the data transmission / reception unit 105 outputs the communication data processed by the device processing unit to the power receiving side terminal 101 via the insulating unit 103 and outputs it to the power feeding side terminal 102 via the insulating unit 104.

  The PD detection circuit 121 is a circuit for detecting a power receiving device (PD: Power Device) to which power is supplied, that is, a power receiving circuit 120 in the power receiving and feeding device 1 by a power feeding device connected to the power receiving side terminal 101. Specifically, the PD detection circuit 121 includes a 25 kΩ resistor, and the power supply device connected to the power receiving side terminal 101 applies a predetermined voltage and detects a current value corresponding to 25 kΩ. The connected device is detected as the power receiving circuit 120.

  When the power feeding device connected to the power receiving side terminal 101 detects the power receiving circuit 120, the power receiving control circuit 122 negotiates with the power feeding device in accordance with the PoE protocol, and controls the power supplied from the power feeding device to provide a DC / DC power supply circuit. 123 for output.

  The DC / DC power supply circuit 123 boosts or lowers the voltage input from the power reception control circuit 122 and is connected to the power supply side terminal 102 from the power supply circuit 106 or power for operating each part in the power supply / reception device 1. Electric power to be supplied to an external power receiving device is generated. The DC / DC power supply circuit 123 supplies power to the data transmission / reception unit 105, the control unit 100, and the power feeding circuit 106, for example, as indicated by a thick arrow in FIG.

  Further, the DC / DC power supply circuit 123 supplies power and connection information (signal) indicating that the power supply is performed by the DC / DC power supply circuit 123 to the control unit 100. . The connection information may be any information that can identify that power is being supplied from the DC / DC power supply circuit 123. For example, the connection information may be information indicating that the power supply apparatus is connected to the power receiving side terminal 101. Good.

  The power feeding circuit (power feeding unit) 106 is a power feeding device (PSE) that supplies power or a circuit having an equivalent function, and operates when connected to the power feeding side terminal 102 by a switching unit 107 described later. Do. Specifically, when a predetermined voltage is applied and a current value corresponding to 25 kΩ is detected, the power feeding circuit 106 detects an external device connected to the power feeding side terminal 102 as a power receiving device. .

  In addition, when the power feeding circuit 106 detects the power receiving device connected to the power feeding side terminal 102, the power feeding circuit 106 applies a predetermined voltage to measure a current value, and detects the detected power receiving device based on the measured current value. Understand the power receiving ability of The power feeding circuit 106 negotiates with the power receiving apparatus connected to the power feeding side terminal 102 in accordance with the PoE protocol, controls the voltage input from the DC / DC power supply circuit 123, and supplies the voltage to the power receiving apparatus.

  The second power reception circuit 130 includes a PD detection circuit 131, a power reception control circuit 132, and a DC / DC power supply circuit 133 having the same functions as the PD detection circuit 121, the power reception control circuit 122, and the DC / DC power supply circuit 123, respectively. In addition, when the power receiving circuit 130 is connected to the power supply side terminal 102 by the switching unit 107 described later, power is supplied from the power supply apparatus erroneously connected to the power supply side terminal 102.

  The DC / DC power supply circuit 133 supplies power to the control unit 100 and the notification unit 108, for example, as indicated by a thick arrow in FIG. Further, the DC / DC power supply circuit 133 supplies power and connection information (signal) indicating that the power supply is performed by the DC / DC power supply circuit 133 to the control unit 100. . The connection information may be information that can identify that power is being supplied from the DC / DC power supply circuit 133. For example, the connection information may be information indicating that the power supply apparatus is connected to the power supply side terminal 102. Good.

  The switching unit 107 is a switch that switches connection so that a current flows between one of the power feeding circuit 106 and the power receiving circuit 130 and the power feeding side terminal 102 according to control by the control unit 100 described later. In addition, the switching unit 107 connects the power receiving circuit 130 and the power feeding side terminal 102 in an initial state where neither the power receiving side terminal 101 nor the power feeding side terminal 102 is connected to the power feeding device or the power receiving device.

  The notification unit 108 operates when power is supplied from the DC / DC power supply circuit 133, and when a power feeding device that should be connected to the power receiving side terminal 101 is erroneously connected to the power feeding side terminal 102, In accordance with control by the control unit 100 to be described later, it is notified that the power supply apparatus is erroneously connected to the power supply side terminal 102. The notification unit 108 is a light emitting element such as an LED (Light Emitting Diode) provided in the vicinity of the power receiving side terminal 101 and the power feeding side terminal 102, for example, and notifies an erroneous connection depending on the light emitting state (for example, in the case of an incorrect connection) LED in the vicinity of the power supply side terminal 102 blinks). Further, the LED may be incorporated in the power receiving side terminal 101 and the power feeding side terminal 102.

  In addition, the notification unit 108 may be a display unit such as an LCD (Liquid Crystal Display) provided in the power supply / reception device 1 and displays information on erroneous connection. The information regarding the erroneous connection is, for example, a description of a character, a picture, a photograph, an animation, and a coping method for the erroneous connection that indicate the erroneous connection.

  In addition, the notification unit 108 may be a sound output unit such as a speaker, and in the case of an incorrect connection, the notification unit 108 outputs sound information about the erroneous connection such as a voice to that effect and guidance from the speaker. Further, the notification unit 108 may use the notification means as described above. In the case of only LEDs, the notification unit 108 can be configured at a low cost, and in the case of providing an LCD or a speaker, the manufacturing cost is higher than in the case of only LEDs, but the user can be notified more easily.

  The control unit 100 operates when power is supplied from the DC / DC power supply circuit 123 or the DC / DC power supply circuit 133, and switches according to the connection status of the apparatus to the power receiving side terminal 101 and the power feeding side terminal 102. 107 and the notification unit 108 are controlled. Such control of the switching unit 107 and the notification unit 108 according to the connection status of the devices to both terminals is one of the gist according to the present embodiment. Hereinafter, the control process of the control unit 100 will be described.

  FIG. 2 is a block diagram illustrating a control configuration of the control unit 100 according to the present embodiment. As shown in FIG. 2, the control unit 100 according to the present embodiment includes a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, an NVRAM (Non Volatile RAM) 14, and a connection. A determination unit 15, a switching control unit 16 and a notification control unit 17 are included.

  The CPU 11 is a calculation unit and controls the operation of each unit of the control unit 100. The ROM 12 is a read-only nonvolatile storage medium, and stores programs such as firmware. The RAM 13 is a volatile storage medium capable of reading and writing information at high speed, and is used as a work area when the CPU 11 processes information. The NVRAM 14 is a nonvolatile storage medium capable of reading and writing information, and stores a control program and control parameters.

  The connection determination unit 15 determines whether the power feeding device is connected to the power receiving side terminal 101 or the power feeding side terminal 102 according to the connection information input from the DC / DC power supply circuit 123 or the DC / DC power supply circuit 133. Specifically, when the connection information is input from the DC / DC power supply circuit 123, the connection determination unit 15 determines that the power supply apparatus is connected to the power receiving side terminal 101 (that is, is correctly connected). When the connection information is input from the DC / DC power supply circuit 133, it is determined that the power supply apparatus is connected to the power supply side terminal 102 (that is, connected erroneously).

  The switching control unit 16 controls the switching unit 107 according to the determination result of the connection determination unit 15. Specifically, when the connection determination unit 15 determines that the power feeding device is connected to the power receiving side terminal 101, the switching control unit 16 switches the switch of the switching unit 107 from the initial state to the power feeding circuit 106 and the power feeding side terminal. Switch so that a current flows between As a result, the power supplied from the power feeding device connected to the power receiving side terminal 101 is supplied to the power receiving device connected to the power feeding side terminal 102 via the power feeding circuit.

  The notification control unit 17 controls the notification unit 108 according to the determination result of the connection determination unit 15. Specifically, when the connection determination unit 15 determines that the power supply device is erroneously connected to the power supply side terminal 102, the notification control unit 17 notifies the notification unit 108 that the power supply device is erroneously connected. Notify via

  Next, control processing by each unit of the control unit 100 will be described with reference to FIG. FIG. 3 is a flowchart illustrating a control process by each unit of the control unit 100. As shown in FIG. 3, the connection determination unit 15 that has started operation when power is supplied from the DC / DC power supply circuit 123 or the DC / DC power supply circuit 133 to each unit of the control unit 100 includes the DC / DC power supply circuit 123 or DC The connection information input from the DC power supply circuit 133 is acquired (S300).

  When the connection determination unit 15 that has acquired the connection information determines that the power supply apparatus is connected to the power receiving side terminal 101 based on the acquired connection information (S301 / YES), each unit of the control unit 100 performs DC / DC The power supply circuit 123 receives power supply from the power feeding device connected to the power receiving side terminal 101 (S302). The switching control unit 16 that has received power supply switches the switch of the switching unit 107 from the initial state so that a current flows between the power supply circuit 106 and the power supply side terminal 102 (S303).

  On the other hand, when the connection determination unit 15 determines that the power supply apparatus is erroneously connected to the power supply side terminal 102 based on the acquired connection information (S301 / NO), each unit of the control unit 100 includes a DC / DC power supply circuit. By 133, the power supply from the power supply apparatus connected to the power supply side terminal 102 is received (S304). Upon receiving the power supply, the notification control unit 17 notifies the notification unit 108 that the power supply apparatus is erroneously connected (S305).

  FIG. 4 is a diagram illustrating the flow of power when the power feeding apparatus is connected to the power receiving side terminal 101 with a thick arrow. As shown in FIG. 4, when power is supplied from the power feeding device connected to the power receiving side terminal 101 to the power receiving circuit 120, power is supplied from the power receiving circuit 120 to the data transmission / reception unit 105 and the control unit 100. The operation of each part starts. Further, since the switch of the switching unit 107 is switched so that a current flows between the power feeding circuit 106 and the power feeding side terminal 102, when power is supplied from the power receiving circuit 120 to the power feeding circuit 106, power feeding from the power feeding circuit 106 is performed. Electric power is supplied to the power receiving device connected to the side terminal 102.

  FIG. 5 is a diagram illustrating the flow of power when the power feeding device is erroneously connected to the power feeding side terminal 102 with a thick arrow. As shown in FIG. 5, when the power feeding device is erroneously connected to the power feeding side terminal 102, the switch of the switching unit 107 remains in the initial state, and therefore, the power feeding device connects the power receiving circuit 130 via the power feeding side terminal 102. Power is supplied. Furthermore, power is supplied from the power receiving circuit 130 to the control unit 100 and the notification unit 108, and the operation of each unit starts.

  In the above embodiment, when power supply to each unit of the control unit 100 is started in S302 and S304, switching control (S303) of the switching unit 107 and notification control (S305) of the notification unit 108 are performed. Before these controls are performed, it may be determined again whether the connection state of the power supply apparatus is the same as the state determined in S301. In this case, for example, one of the I / O ports of the CPU is pulled up by the power generated by the DC / DC power supply circuit 123 and is pulled by the power generated by the DC / DC power supply circuit 133 at another port. To be up. Then, when power supply to each unit of the control unit 100 is started in S302 and S304, for example, the connection determination unit 15 determines which I / O port is supplied with power, and the power supply apparatus is correctly connected. It is determined whether or not it is connected.

  As described above, in the power supply / reception device 1 according to the present embodiment, the switching unit 107 is connected to the communication cable because the switching unit 107 connects the second terminal 102 to the second power receiving circuit 130 as an initial state. Even when an external power supply device is connected to either the first terminal 101 or the second terminal, power is supplied to the control unit 100 without using a dedicated power cable. In addition, the control unit 100 that operates with power supplied to any one of the power receiving circuits can detect which of the power receiving circuit 120 and the power receiving circuit 130 is supplied with power from the power feeding apparatus. As a result, the control unit 100 detects that power is being supplied from the power supply device to the second power receiving circuit 130, that is, the power supply device is erroneously connected to the second terminal 102, and the notification unit 108 supplies power. Since it is possible to notify the erroneous connection of the device, and the user can immediately grasp the erroneous connection by the notification unit 108 and correctly reconnect the power supply device, the power supply / reception device that receives and supplies power via the communication cable It is possible to improve the convenience of the user when supplying power to 1.

  Note that the power receiving circuit 130 according to the present embodiment only needs to be able to supply the control unit 100 and the notification unit 108 with enough power to notify the erroneous connection via the notification unit 108. It may be smaller than the power receiving circuit 120 that supplies power to the data transmitting / receiving unit 105 and the power feeding circuit 106. That is, the circuit scale of the power receiving circuit 130 may be smaller than the circuit scale of the power receiving circuit 120. With such a configuration, it is possible to reduce the manufacturing cost and reduce the size of the power supply / reception device 1 according to the present embodiment.

  Further, in the above-described embodiment, the case where the control unit 100 includes an arithmetic device such as the CPU 11 and a program stored in the ROM 12, the RAM 13, the NVRAM 14, and the like has been described as an example. In addition, the control part 100 may be implement | achieved by hardware circuits, such as ASIC (Application Specific Integrated Circuit).

  Moreover, in the said embodiment, the case where two terminals, the power receiving side terminal 101 and the power feeding side terminal 102, were provided in the power receiving and feeding apparatus 1 was demonstrated as an example. However, this is an example, and other power receiving side terminals and power feeding side terminals may be further provided. Also in this case, when the power receiving circuit and the switching unit are configured similarly to other power receiving side terminals and power feeding side terminals, and another power feeding device is mistakenly connected to the other power feeding side terminals, the notification unit 108 is changed. The user is notified of the erroneous connection.

  Next, a second embodiment of the present invention will be described. In the power supply / reception device 1 according to the first embodiment, the power supply device supplies power by distinguishing the first terminal 101 and the second terminal 102 to which the communication cable is connected from the power reception side terminal 101 and the power supply side terminal 102. When connected to the side terminal 102, the user is notified that the connection is incorrect. In the power supply / reception device 1 according to the second embodiment, the first terminal 101 and the second terminal 102 are not distinguished from each other as in the first embodiment, and the power supply device is the first terminal 101 and the second terminal 102. It is configured to operate appropriately regardless of which of the terminals 102 is connected.

  FIG. 6 is a block diagram illustrating the configuration of the power supply / reception device 1 according to the second embodiment. As shown in FIG. 6, the power supply / reception device 1 according to the present embodiment is configured such that the notification unit 108 is removed from the configuration shown in FIG. 1, and the second switching unit 109 and the second power supply are added to the configuration shown in FIG. The circuit 110 is added. Only the configuration and operation different from the configuration of FIG. 1 will be described below.

  In the first embodiment, the power receiving circuit 120 and the power receiving circuit 130 have been described as having a circuit scale smaller than that of the power receiving circuit 120. However, in the second embodiment, the power receiving circuit The circuit scale 130 is equivalent to the power receiving circuit 120.

  The first power receiving circuit 120 operates when connected to the first terminal 101 by a second switching unit 109 described later. The second power supply circuit 110 is a circuit similar to the first power supply circuit, and operates when connected to the first terminal 101 by a second switching unit 109 described later.

  The second switching unit 109 switches connection so that a current flows between one of the first power receiving circuit 120 and the second power feeding circuit 110 and the first terminal 101 according to control by the control unit 100. Switch. In addition, the second switching unit 109 is connected to the first power receiving circuit 120 and the first power receiving circuit 120 in an initial state where neither the first terminal 101 nor the second terminal 102 is connected to the power feeding device or the power receiving device. 1 terminal 101 is connected. The first switching unit 107 connects the second power receiving circuit 130 and the second terminal 102 in the initial state.

  The DC / DC power supply circuit 133 of the second power receiving circuit 130 supplies power to the control unit 100 and the data transmission / reception unit 105 as indicated by a thick arrow in FIG.

  The control unit 100 operates when power is supplied from the DC / DC power supply circuit 123 or the DC / DC power supply circuit 133, and according to the connection status of the device to the first terminal 101 and the second terminal 102, The first switching unit 107 and the second switching unit 109 are controlled. Such control of the first switching unit 107 and the second switching unit 109 according to the connection status of the device to both terminals is one of the gist according to the present embodiment. Hereinafter, the control process of the control unit 100 in the second embodiment will be described.

  FIG. 7 is a block diagram illustrating a control configuration of the control unit 100 according to the second embodiment. As illustrated in FIG. 7, the control unit 100 according to the second embodiment has a configuration in which the notification control unit 17 is removed from the configuration illustrated in FIG. 2. Hereinafter, a configuration for performing an operation different from the operation described in FIG. 1 will be described.

  When the connection information is input from the DC / DC power supply circuit 123, the connection determination unit 15 determines that the power supply apparatus is connected to the first terminal 101, and the connection information is input from the DC / DC power supply circuit 133. If it is determined that the power supply device is connected to the second terminal 102.

  When the connection determination unit 15 determines that the power supply apparatus is connected to the first terminal 101, the switching control unit 16 switches the switch of the first switching unit 107 from the initial state to the first power supply circuit 106 and the first power supply circuit 106. The switching is performed so that a current flows between the two terminals 102. In addition, when the connection determination unit 15 determines that the power supply apparatus is connected to the second terminal 102, the switching control unit 16 switches the switch of the second switching unit 109 from the initial state to the first power supply circuit 110. And the first terminal 101 is switched so that a current flows.

  Next, control processing by each unit of the control unit 100 according to the second embodiment will be described with reference to FIG. FIG. 8 is a flowchart illustrating control processing by each unit of the control unit 100. As shown in FIG. 8, the connection determination unit 15 that has started operation when power is supplied from the DC / DC power supply circuit 123 or the DC / DC power supply circuit 133 to each unit of the control unit 100 includes the DC / DC power supply circuit 123 or DC The connection information input from the DC power supply circuit 133 is acquired (S800).

  When the connection determination unit 15 that has acquired the connection information determines that the power supply apparatus is connected to the first terminal 101 based on the acquired connection information (S801 / YES), each unit of the control unit 100 performs DC / DC The DC power supply circuit 123 receives power supply from the power supply device connected to the first terminal 101 (S802). Upon receiving the power supply, the switching control unit 16 switches the switch of the first switching unit 107 from the initial state so that a current flows between the first power feeding circuit 106 and the second terminal 102 (S803).

  On the other hand, when the connection determination unit 15 determines that the power feeding apparatus is connected to the second terminal 102 based on the acquired connection information (S801 / NO), each unit of the control unit 100 is a DC / DC power supply circuit. The power supply is received from the power supply apparatus connected to the second terminal 102 by 133 (S804). Upon receiving the power supply, the switching control unit 16 switches the switch of the second switching unit 109 from the initial state so that a current flows between the second power feeding circuit 110 and the first terminal 101 (S805).

  FIG. 9 is a diagram illustrating the flow of power when the power feeding apparatus is connected to the first terminal 101 with a thick arrow. As shown in FIG. 9, when the power feeding device is connected to the first terminal 101, the switch of the second switching unit 109 remains in the initial state, and therefore the power receiving circuit from the power feeding device via the first terminal 101. When power is supplied to 120, power is supplied from the first power receiving circuit 120 to the data transmitting / receiving unit 105 and the control unit 100, and the operation of each unit starts.

  Further, since the switch of the first switching unit 107 is switched so that a current flows between the first power supply circuit 106 and the second terminal 102, the first power supply circuit 120 to the first power supply circuit 106. Is supplied from the first power supply circuit 106 to the power receiving device connected to the second terminal 102.

  FIG. 10 is a diagram illustrating the flow of power when the power feeding apparatus is connected to the second terminal 102 with a thick arrow. As shown in FIG. 10, when the power feeding device is connected to the second terminal 102, the switch of the first switching unit 107 remains in the initial state, and therefore the second from the power feeding device via the second terminal 102. When power is supplied to the power receiving circuit 130, power is supplied from the second power receiving circuit 130 to the data transmitting / receiving unit 105 and the control unit 100, and the operation of each unit starts.

  Further, since the switch of the second switching unit 109 is switched so that a current flows between the second power feeding circuit 110 and the first terminal 101, the second power feeding circuit 130 to the second power feeding circuit 110. Is supplied from the second power feeding circuit 110 to the power receiving device connected to the first terminal 101.

  As described above, in the power supply / reception device 1 according to the second embodiment, the switching unit 107 is connected to the second power receiving circuit 130 in the initial state, and the switching unit 109 is in the initial state. Since the first terminal 101 is connected to the first power receiving circuit 120, the external power supply device connected to the communication cable is connected to either the first terminal 101 or the second terminal 102. Even if it exists, electric power is supplied with respect to the control part 100, without using a separate dedicated power cable. In addition, as in the first embodiment, the control unit 100 that operates with the power supplied to any one of the power receiving circuits is supplied with power from the power feeding device to either the power receiving circuit 120 or the power receiving circuit 130. Can be detected. As a result, the control unit 100 detects which terminal the power feeding device is connected to and from the power feeding device via one terminal according to the power supply state to the power receiving circuit 120 and the power receiving circuit 130. Since it is possible to supply power to the power receiving device via the other terminal, the convenience of the user when supplying power to the power receiving and feeding device 1 that receives and supplies power via the communication cable is improved. It becomes possible to improve.

  In the above embodiment, the case where the two terminals 101 and 102 are provided in the power supply / reception device 1 has been described as an example. However, this is an example, and three or more terminals may be provided. In that case, the power supply / reception device 1 is provided with the same number of power reception circuits, power supply circuits, and switching units as the number of terminals. When a power feeding device is connected to one of the plurality of terminals, a current flows between the terminal and the power feeding circuit in each of the switching units connected to terminals other than the terminal to which the power feeding device is connected. By switching the switch, power can be supplied to a power receiving device connected to a terminal other than the terminal to which the power feeding device is connected.

  In addition, when three or more terminals are provided, and a power feeding device is connected to one or more of the plurality of terminals, the power receiving device is connected to a terminal other than the terminal to which the power feeding device is connected. When connected, the switching unit connected to the terminal to which the power receiving device is connected switches the switch so that a current flows between the terminal and the power feeding circuit. With such a configuration, after the power feeding device is connected to one terminal, either the power feeding device or the power receiving device may be connected to the other terminal, and the user's convenience to the power feeding / receiving device 1 is higher. Become.

1 Power supply / reception device 11 CPU
12 ROM
13 RAM
14 NVRAM
DESCRIPTION OF SYMBOLS 15 Connection determination part 16 Switching control part 17 Notification control part 100 Control part 101,102 Terminal 103,104 Insulation part 105 Data transmission / reception part 106,110 Feeding circuit 107,109 Switching part 108 Notification part 120,130 Power receiving circuit 121,131 PD Detection circuit 122, 132 Power reception control circuit 123, 133 DC / DC power supply circuit

JP 2009-260407 A

Claims (9)

A power supply / reception device that receives and supplies power via a communication cable,
A first power receiving unit that receives power supply from an external power supply device connected by a communication cable via a first terminal;
A second power receiving unit that receives power from an external power supply device connected by a communication cable via the second terminal;
A power supply unit that supplies power to the outside via the second terminal based on the power supplied to the first power receiving unit;
A switching unit for connecting the second terminal to one of the second power receiving unit and the power feeding unit;
A switching control unit that operates by power supplied to at least one of the first power receiving unit and the second power receiving unit and controls a connection state of the switching unit, and
The switching unit sets a state of connecting the second terminal to the second power receiving unit as an initial state,
When the switching control unit detects that power is supplied to the first power receiving unit, the switching control unit controls a connection state of the switching unit to connect the second terminal to the power feeding unit. A power supply / reception device. A notification unit for notifying an erroneous connection of the power supply device;
A notification control unit that operates by power supplied to the second power reception unit and controls the notification unit;
When the notification control unit detects that power is supplied to the second power receiving unit, the notification control unit notifies that the power supply apparatus is erroneously connected to the second terminal through a communication cable. The power supply / reception device according to claim 1, wherein the notification unit is controlled. The power supply / reception device according to claim 2, wherein the second power reception unit has a power reception capacity smaller than that of the first power reception unit. The power supply / reception device according to claim 2, wherein the notification unit is a light emitting element that notifies an erroneous connection of the power supply device according to a light emission state. The power supply / reception device according to any one of claims 2 to 4, wherein the notification unit is a display unit that displays information on erroneous connection of the power supply device. The power supply / reception device according to claim 2, wherein the notification unit is an audio output unit that outputs audio information regarding erroneous connection of the power supply device. A second power feeding unit that supplies power to the outside via the first terminal based on the power supplied to the second power receiving unit;
A second switching unit that connects the first terminal to one of the first power receiving unit and the second power feeding unit, and
The second switching unit has a state of connecting the first terminal to the first power receiving unit as an initial state,
The switching control unit controls a connection state of the switching unit and the second switching unit according to a power supply state to the first power receiving unit and the second power receiving unit. The power supply / reception device according to claim 1. When the switching control unit detects that power is supplied to the second power receiving unit, the switching control unit connects the first terminal to the second power feeding unit. The power supply / reception device according to claim 7, wherein the connection state is controlled. A method of controlling a power supply / reception device that receives and supplies power via a communication cable,
The power supply / reception device is:
A first power receiving unit that receives power supply from an external power supply device connected by a communication cable via a first terminal;
A second power receiving unit that receives power from an external power supply device connected by a communication cable via the second terminal;
A power supply unit that supplies power to the outside via the second terminal based on the power supplied to the first power receiving unit;
A switching unit that connects the second terminal to one of the second power receiving unit and the power feeding unit, and
The switching unit sets a state of connecting the second terminal to the second power receiving unit as an initial state,
When it is detected that power is supplied to the first power receiving unit by operating with power supplied to at least one of the first power receiving unit and the second power receiving unit, A control method comprising: controlling a connection state of the switching unit so as to connect a second terminal to the power feeding unit.