JP2016111453A - Power reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power reception device which can be activated at high speed.SOLUTION: A power reception device 1 is adaptable to PoE power supply from a power supply device 3 through a communication cable 2. The power reception device 1 has a controller 5 for controlling the operation of the power reception device 1, and a PoE+authentication circuit 4. When the power reception device 1 is connected to the power supply device 3 through the cable 2, the PoE+authentication circuit 4 performs at least one of soft authentication and hard authentication to authenticate whether the power supply device 3 is adapted to a PoE+ system. When the authentication based on the at least one of the soft authentication and the hard authentication is finished, the controller 5 activates the whole device of the power reception device 1.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a power receiving device that is fed with power from a power feeding device via a cable.

  Patent Document 1 discloses a power supply control in a case where a network camera is installed in a housing incorporating a temperature control unit such as a fan and a heater, regarding a network camera system compatible with PoE (Power over Ethernet (registered trademark)).

JP 2013-247652 A

  The present disclosure provides a power receiving device that can be activated at high speed in a power receiving device that is fed from a power feeding device via a cable.

  The power receiving device in the present disclosure is a power receiving device that supports PoE power feeding from the power feeding device via a communication cable. The power receiving apparatus includes a controller that controls the operation and a power reception authentication circuit. When the power receiving apparatus is connected to the power supply apparatus by the cable, the power reception authentication circuit performs at least one of soft authentication and hardware authentication for authenticating whether or not the power supply apparatus supports the PoE + method. When authentication by at least one of soft authentication and hard authentication is completed, the controller activates the entire power receiving apparatus.

  The power receiving device according to the present disclosure can be started at a high speed when the power receiving device receives power from the power feeding device via the communication cable and starts the own device.

1 is a block diagram showing a configuration of a power receiving device according to a first embodiment. Flowchart for explaining operations of power receiving device and power feeding device

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
Hereinafter, the first embodiment will be described with reference to FIGS.

[1-1. Constitution]
FIG. 1 is a block diagram illustrating a main configuration of the power receiving device 1 according to the first embodiment, in which the power receiving device 1 is connected to the power feeding device 3 via the communication cable 2. The power receiving device 1 is, for example, a monitoring camera, the cable 2 is, for example, a LAN cable, and the power feeding device 3 is, for example, a switching hub.

  The power receiving apparatus 1 includes a PoE + authentication circuit (power reception authentication circuit) 4, a controller 5, an image input system 6, an image processor 7, and a memory 8. The controller 5 controls the operation of the power receiving apparatus 1 and may be realized by a hard-wired electronic circuit or a microcomputer that executes a program. The image input system 6 includes a plurality of lenses, a lens controller, an image sensor, and the like, captures a subject image, and generates image information. The image processor 7 performs various processes on the image information generated by the image input system 6. For example, the image processor 7 performs gamma correction, white balance correction, flaw correction, encoding processing, and the like on the image information in accordance with an instruction from the controller 5. The memory 8 is an external memory having a nonvolatile recording unit such as a flash memory. The memory 8 can record data such as image information processed by the image processor 7.

  The PoE + authentication circuit 4 includes an RJ45 connector 10, a power data separation circuit 11, a software authentication microcomputer 12, a PoE power supply circuit and hardware authentication circuit 13, and an authentication determination circuit 14. The PoE + authentication circuit 4 is configured by a circuit that can operate within the range of power supplied by the PoE method.

  The RJ45 connector 10 is a connector to which the communication cable 2 is connected, and the power receiving device 1 and the power feeding device 3 are connected by the cable 2. The power receiving device 1 receives power supplied from the power feeding device 3 through the cable 2. The power receiving mechanism is a standardized technology (IEEE 502.3af) that receives power supply using a cable used for Ethernet wiring.

  The power data separation circuit 11 separates the signal received by the RJ45 connector 10 into data and power. This signal separation is performed by a method called insulation by a pulse transformer, for example. The data is sent to the software authentication microcomputer 12, and the power is sent to the PoE power supply circuit and the hardware authentication circuit 13. The data sent to the soft authentication microcomputer 12 includes data such as LLDP (Link Layer Discovery Protocol), and the data is sent by packet transmission / reception. Further, the hardware authentication is performed by applying an arbitrary voltage from the power feeding device 3 and a current return from the power receiving device 1.

  The software authentication microcomputer 12 uses the data received from the power data separation circuit 11 to authenticate whether or not the power supply apparatus 3 is compatible with the PoE + method. This authentication method is called soft authentication. Then, the software authentication microcomputer 12 sends a software authentication completion notification to the authentication determination circuit 14 when the software authentication is completed.

  The hardware authentication circuit included in the PoE power supply circuit and the hardware authentication circuit 13 uses the voltage for hardware authentication received from the power data separation circuit 11 to determine whether or not the power supply apparatus 3 supports the PoE method and the PoE + method. Authenticate. This authentication is called hard authentication. Then, when the hardware authentication is completed, the hardware authentication circuit sends a hardware authentication completion notification to the authentication determination circuit 14.

  The PoE power supply circuit included in the PoE power supply circuit and the hardware authentication circuit 13 is a power supply circuit for supplying power to a circuit, a microcomputer, and the like necessary for performing the above-described soft authentication and hardware authentication. That is, the PoE power supply circuit is a power supply circuit for supplying power to some circuits of the power receiving device 1, a microcomputer, and the like.

  The authentication determination circuit 14 receives the software authentication completion notification and the hardware authentication completion notification, and determines whether or not to activate the entire power receiving apparatus 1 based on these notifications. When it is determined that the entire power receiving apparatus 1 can be activated, an apparatus activation notification is sent to the controller 5. The authentication determination circuit 14 may be configured to receive an AC adapter power supply notification in addition to the software authentication completion notification and the hardware authentication completion notification. The AC adapter power supply notification is a notification used in the power receiving device that also supports power supply by the AC adapter, and is a notification when the AC adapter is connected to the power receiving device 1. When an AC adapter is connected to the power receiving device 1, the entire power receiving device is activated by power feeding from the AC adapter.

[1-2. Operation]
The operation of the power receiving device 1 configured as described above will be described below. When the power receiving device 1 is connected to the power feeding device 3 through the cable 2, the power receiving device 1 performs various operations such as hardware authentication, software authentication, and activation of the entire device. Hereinafter, each operation will be described in detail.

  FIG. 2 is a flowchart for explaining operations of the power receiving device 1 and the power feeding device 3. Note that the power receiving device 1 and the power feeding device 3 are devices compatible with at least the PoE method.

  The power receiving device 1 monitors whether or not the power receiving device 1 is connected to the power feeding device 3 by the cable 2 (step S1). When the power receiving device 1 is connected to the power feeding device 3 by the cable 2 (when YES in step S1), the power that can be supplied from the power feeding device 3 to the power receiving device 1 by the PoE method is fed, and PoE + for authentication The circuit 4 becomes operable. Then, the power receiving device 1 and the power feeding device 3 authenticate whether each other device is compatible with the PoE + method. When the PoE + authentication circuit 4 becomes operable, the power receiving apparatus 1 authenticates the power supply apparatus 3 (whether the power supply apparatus 3 is compatible with the PoE + system). The power receiving apparatus 1 performs hardware authentication and software authentication. The power supply apparatus 3 normally performs either hardware authentication or software authentication. As a result of authentication, if it is determined that each other device is compatible with the PoE + method, if it is determined that the connected power receiving device 1 is compatible with the PoE + method, it can be supplied to the power receiving device 1 with the PoE + method. Supply of large power (larger than the power that can be supplied by the PoE method) is started.

  The power receiving apparatus 1 performs hardware authentication when the PoE + authentication circuit 4 becomes operable (step S2). If the power supply device 3 is compatible with the hardware authentication and is compatible with the PoE + method, the hardware authentication authenticates that the power supply device 3 is compatible with the PoE + method (YES in step S2). Then, electric power that can be supplied by the PoE + method is supplied from the power feeding device 3 to the power receiving device 1, and the entire device of the power receiving device 1 is activated (step S5).

  When the power feeding device 3 does not support hardware authentication, the power receiving device 1 cannot perform authentication by hardware authentication (NO in step S2). In this case, the power receiving apparatus 1 performs soft authentication (step S3). When the power supply apparatus 3 is compatible with the soft authentication and is compatible with the PoE + system, it is authenticated by this soft authentication that the power supply apparatus 3 is compatible with the PoE + system (YES in step S3). Then, electric power that can be supplied by the PoE + method is supplied from the power feeding device 3 to the power receiving device 1, and the entire device of the power receiving device 1 is activated (step S5).

  Then, the case where the power supply device 3 does not support the PoE + method is applicable, but when the power reception device 1 cannot authenticate by software authentication (NO in step S3), the entire power reception device 1 is activated. No (step S6).

  In this way, when the power receiving apparatus 1 completes authentication by either hardware authentication or software authentication, the entire apparatus of the power receiving apparatus 1 is started based on the completion notification (hard authentication completion notification or soft authentication completion notification). It is said. That is, a completion notification is sent to the authentication discrimination circuit 14 when either one of the hardware authentication and the software authentication is completed without waiting for the completion of both the hardware authentication and the software authentication.

  The software authentication of the power receiving apparatus 1 requires activation of a microcomputer in the power receiving apparatus 1 and transmission of a packet necessary for authentication to the power supply apparatus 3, and it takes time to activate the microcomputer. For this reason, soft authentication usually takes longer time than hard authentication. The time required for authentication can be shortened in the technique of the present disclosure compared to the case where the authentication is not completed unless both the soft authentication and the hard authentication are completed. For this reason, according to the technique of this indication, the power receiving apparatus 1 whole can be started in a shorter time.

  Here, according to the technology of the present disclosure, the hardware authentication is faster in the power receiving apparatus 1 than the soft authentication, and the power receiving apparatus 1 can be started up at high speed if the power supply apparatus 3 is compatible with the hardware authentication. it can. However, if the power supply apparatus 3 is an apparatus that supports only soft authentication, in order to activate the entire power receiving apparatus 1, time required for soft authentication is required.

[1-3. Effect]
As described above, in the present embodiment, the power receiving device 1 provides a completion notification (hardware authentication completion notification, soft authentication completion notification) indicating that authentication by either hardware authentication or software authentication for the power supply device 3 has ended. Based on this, the entire power receiving apparatus is activated.

  Thus, if the power supply device 3 is a switching hub that supports hardware authentication, the entire device of the power receiving device 1 can be activated in a short time without the time required for software authentication becoming a bottleneck. Hardware authentication is faster in the power receiving apparatus 1 than in software authentication, and the power receiving apparatus can be activated at high speed if the power supply apparatus 3 is compatible with hardware authentication.

(Other embodiments)
As described above, the first embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments that have been changed, replaced, added, omitted, and the like.

  Therefore, other embodiments will be exemplified below.

  In Embodiment 1, PoE + has been described. PoE + may be any power transmission / reception standard that requires soft authentication and hard authentication. Therefore, the standard that requires soft authentication and hard authentication is not limited to PoE +. However, if PoE + is used, infrastructure construction is progressing, and system construction is possible at low cost. Further, although a monitoring camera is illustrated as the power receiving apparatus, a web camera, an IP phone, or the like may be used.

  The above-described embodiments are for illustrating the technique in the present disclosure, and various modifications, replacements, additions, omissions, and the like can be made within the scope of the claims and their equivalents.

  The present disclosure is applicable to, for example, a PoE + compatible power receiving apparatus. Specifically, the present disclosure is applicable to a web camera, a monitoring camera, an IP phone, and the like.

DESCRIPTION OF SYMBOLS 1 Power receiving apparatus 2 Cable 3 Power supply apparatus 4 PoE + authentication circuit 5 Controller 6 Image input system 7 Image processor 8 Memory 10 RJ45 connector 11 Power data separation circuit 12 Software authentication microcomputer 13 PoE power supply circuit and hardware authentication circuit 14 Authentication discrimination circuit

Claims (1)

A power receiving device that supports PoE power feeding from a power feeding device via a communication cable,
A controller for controlling the operation of the power receiving device and a circuit for power reception authentication;
When the power receiving apparatus is connected to the power supply apparatus by the cable, the power reception authentication circuit performs at least one of soft authentication and hard authentication for authenticating whether or not the power supply apparatus supports the PoE + system. When the authentication by at least one of the soft authentication and the hard authentication ends, the controller activates the entire device of the power receiving device.