JP4448421B2 - Network relay device - Google Patents

Description

  The present invention relates to, for example, a ring-type network, and determines the type of power supplied to an electronic device, and performs network switching that switches a ring according to whether or not the electronic device is connected and whether the electronic device is powered on It relates to the device.

  Conventionally, as a data transmission system for transmitting data in a vehicle, for example, an optical fiber cable (optical transmission line) is installed in the vehicle, and non-time series data such as commands, video data, etc. using the optical fiber cable. Those that transmit time-series data are known.

  In such a data transmission system, there is a synchronous ring network for the purpose of transmitting time-series audio data, video data, and the like. In this synchronous ring network, each electronic device is connected in a ring shape by an optical transmission line, and data transmission is performed by synchronizing the data transmission timing between the respective electronic devices.

  In such a data transmission system, power from a battery is converted and supplied to a plurality of electronic devices connected to a network via a power line.

  However, in such a synchronous ring network, if a part of the optical transmission line connected in a ring shape is cut off, the transmission of the optical signal in the cut part becomes impossible, and the optical transmission line and the electronic that can be used for a part of the ring type network. Even if there is a device, there is a problem that communication of the entire system cannot be maintained and power is continuously supplied to an electronic device in which transmission of an optical signal is disabled.

  Therefore, in Patent Document 1, as shown in FIG. 5, a first J / B (junction block: electrical connection box) 1 and a second J / B (junction block: electrical connection box) 2 connected to the power supply line 3 are provided. In addition to being connected by the communication line 4, the first J / B1 is provided with a photoelectric conversion unit (not shown) corresponding to the electronic devices A to C and a switch circuit (not shown) corresponding to these photoelectric conversion units, and the second J / B1 A photoelectric conversion unit (not shown) corresponding to the electronic devices D and E, a switch circuit (not shown) corresponding to these photoelectric conversion units, and the like are provided, and any one of the photoelectric conversion units and any of the electronic devices A to E are connected. When the optical transmission path is cut off, the status signal from the photoelectric conversion unit disappears, so that the switch circuit is closed and the photoelectric conversion unit is bypassed. The relay apparatus which stops the electric power supply to either of E is proposed.

In Patent Document 2, as shown in FIG. 6, a photoelectric conversion unit 5, a current detection unit 6, and a switch circuit 7 corresponding to each of the electronic devices A to D are provided, and the current detection unit 6 uses the electronic devices A to D. When the current value is detected and the connection state is good, the power from the power supply line 8 is supplied to the good electronic devices A to D, and the communication state with the electronic devices A to D is abnormal by the communication IC 9 In this case, the switch control unit 9a determines that the communication state is abnormal, and controls the switch circuit 7 corresponding to one of the electronic devices A to D to correspond to either stop of power supply or one of the electronic devices A to D. The relay apparatus which bypasses the photoelectric conversion part 5 is proposed.
Japanese Patent Application No. 2003-054599 Japanese Patent Application No. 2003-055928

  However, in the device disclosed in Patent Document 1 described above, the photoelectric conversion unit converts an optical signal into an electrical signal or outputs a Status signal, so that a signal conversion circuit or Status signal is output to the photoelectric conversion unit. An output circuit or the like is required, which causes a problem that the relay device is increased in size and cost.

  Moreover, in the thing shown by patent document 2, in the initial state in which system starting is performed, electric power is once supplied to all the electronic devices AD, and initial communication with each electronic device AD by the communication IC 9 is performed. Since power is supplied to any one of the electronic devices A to D whose communication state is confirmed to be normal, it takes time to start the system, and power consumption and dark current are large at the time of starting the system. There was a problem of becoming.

  The problem to be solved is that, if the network is configured by, for example, an optical transmission line connected in a ring shape, it is necessary to convert the optical signal into an electric signal or output the Status signal by the photoelectric conversion unit. In the initial state when the system is activated, the electronic device is temporarily used because the photoelectric conversion unit requires a signal conversion circuit, a status signal output circuit, etc., which increases the size and cost of the relay device. If you try to check the communication status by initial communication with each electronic device by supplying power to all of the devices, not only will it take time to start the system, but also power consumption and dark current will increase at the time of system startup is there.

The network relay device of the present invention is a network relay device that connects a plurality of electronic devices to a ring network and relays electrical signals in each of the electronic devices,
Detecting means for detecting presence / absence of connection of the electronic device, power supply means for supplying power to the electronic device when detection of the connection of the electronic device is detected by the detecting means, and detection of the electronic device by the detecting means When it is detected that there is no connection , it comprises a bypass means for bypassing the connection path of the electronic device, and the detection means is a plurality of short-circuits that output different signals depending on the connection status of the electronic device, The power supply means is a multiplexer that determines and supplies power to be supplied to the electronic device according to an output from any one of the short circuits, and the bypass means is a logic of outputs of the plurality of short circuits. A logic circuit that takes a sum, and a switch that opens or closes a connection path of the electronic device in accordance with an output of the logic circuit, According to the connection status of the connector on the electronic device side, an H or L signal is output, and the logic circuit is used to close the bypass means when there is no change in output from all the short circuits. A signal is output .
The network relay device of the present invention is a network relay device that connects a plurality of electronic devices to a ring-type network and relays electrical signals in each of the electronic devices, and the power-on state of the electronic device side Detecting means for detecting the electronic device, and bypass means for bypassing a connection path of the electronic device when the detecting device detects that the electronic device side is not turned on, and the detecting device includes the electronic device. A plurality of short-circuits that output different signals according to the connection status of the plurality of short-circuits; A switch that opens or closes the connection path of the electronic device, and one of the short-circuits is an H or L signal depending on the connection status of the connector on the electronic device side. Output, the logic circuit, when there is no change in the output from all of the short circuit, and outputs a signal for closing against said bypass means.
The telecommunications system of the present invention has a first electrical connection box for connecting a plurality of first electronic devices and a second electrical connection box for connecting a plurality of second electronic devices, and these first electrical connection boxes, A telecommunications system in which at least the plurality of first electronic devices and the plurality of second electronic devices are connected in a ring shape by being connected to a second electrical junction box via a transmission line, The electrical connection box and the second electrical connection box include a detection unit that detects whether or not the electronic device is connected, and a power source that supplies power to the electronic device when the detection unit detects the connection of the electronic device. A supply unit, and a bypass unit that bypasses a connection path of the electronic device when the detection unit detects that the electronic device is not connected, the detection unit according to a connection status of the electronic device Different beliefs The power supply means is a multiplexer that determines and supplies power to be supplied to the electronic device according to the output from any one of the short circuits, and the bypass means A logic circuit that takes a logical sum of outputs of the plurality of short circuits, and a switch that opens or closes a connection path of the electronic device according to the output of the logic circuit, and any one of the short circuits is Depending on the connection status of the connector on the electronic device side, an H or L signal is output, and the logic circuit is used to close the bypass means when there is no change in output from all the short circuits. A network relay device that outputs a signal is incorporated.
The telecommunications system of the present invention has a first electrical connection box for connecting a plurality of first electronic devices and a second electrical connection box for connecting a plurality of second electronic devices, and these first electrical connection boxes, A telecommunications system in which at least the plurality of first electronic devices and the plurality of second electronic devices are connected in a ring shape by being connected to a second electrical junction box via a transmission line, In the electrical junction box and the second electrical junction box, detection means for detecting the power-on state of the electronic device side, and when the detection means detects that the electronic device-side power source is not turned on, Bypass means for bypassing the connection path of the device , wherein the detection means is a plurality of short circuits that output different signals depending on the connection status of the electronic device, and the bypass means is the plurality of short circuits. Output logic And a switch that opens or closes the connection path of the electronic device according to the output of the logic circuit, and any one of the short circuits corresponds to the connection status of the connector on the electronic device side. A network relay device that outputs a signal for closing the bypass means when there is no change in the output from all the short-circuits. It is characterized by being.
The telecommunication system of the present invention has a first joint connector for connecting a plurality of first electronic devices and a second joint connector for connecting a plurality of second electronic devices, and these first joint connector and second joint. A telecommunications system in which at least the plurality of first electronic devices and the plurality of second electronic devices are connected in a ring shape by being connected to a connector through a transmission line, wherein the first joint connector and the first connector The two-joint connector includes a detection unit that detects whether or not the electronic device is connected, a power supply unit that supplies power to the electronic device when the detection unit detects the connection of the electronic device, and the detection When detected that there is no connection of the electronic device by means, and a bypass means for bypassing the connection path of the electronic device, said analyzing The means is a plurality of short-circuits that output different signals according to the connection status of the electronic device, and the power supply means supplies power to the electronic device according to the output from any of the short-circuits The bypass means opens or closes a logic circuit that takes a logical sum of outputs of the plurality of short circuits, and opens or closes a connection path of the electronic device in accordance with the output of the logic circuit. One of the short circuits outputs an H or L signal according to the connection status of the connector on the electronic device side, and the logic circuit changes the output from all the short circuits. When there is no network relay device, a signal for closing the bypass means is incorporated.
The telecommunications system of the present invention includes a first joint connector for connecting a plurality of first electronic devices and a second joint connector for connecting a plurality of second electronic devices. The first joint connector and the second joint A telecommunications system in which at least the plurality of first electronic devices and the plurality of second electronic devices are connected in a ring shape by being connected to a connector via a transmission line, wherein the first joint connector and the first connector The two-joint connector bypasses the connection path of the electronic device when detecting that the electronic device side is not turned on by detecting means for detecting the power-on state of the electronic device side. and a bypass means for said detecting means is a plurality of short circuit that outputs different signals depending on the connection status of the electronic device, before The bypass means includes a logic circuit that performs a logical sum of outputs of the plurality of short circuits, and a switch that opens or closes a connection path of the electronic device according to the output of the logic circuit, and any of the short circuits The circuit outputs an H or L signal according to the connection status of the connector on the electronic device side, and the logic circuit is closed with respect to the bypass means when there is no change in output from all the short circuits. A network relay device that outputs a signal to be transmitted is incorporated.
In the network relay device according to the present invention, the detection unit detects whether or not the electronic device is connected. When the detection unit detects the connection of the electronic device, the power supply unit supplies power to the electronic device. When it is detected that there is no connection of the electronic device, the connection path of the electronic device is bypassed by the bypass means.

  According to the network relay device of the present invention, the presence or absence of the connection of the electronic device is detected by the detection means, and when the connection of the electronic device is detected by the detection means, the power is supplied to the electronic device by the power supply means, and the detection means When it is detected that there is no connection of an electronic device, the bypass device bypasses the connection path of the electronic device, so a status signal indicating the presence or absence of connection is output compared to a relay device that uses an optical signal. Or a circuit for converting an optical signal into an electrical signal is not required, so that downsizing and cost reduction can be achieved, and power is supplied to the electronic device when the connection of the electronic device is confirmed. Therefore, not only can the system start up quickly, but also power consumption and dark current can be minimized.

  The network relay device of the present invention detects the presence or absence of connection of an electronic device by the detection means, and when the connection of the electronic device is detected by the detection means, supplies power to the electronic device by the power supply means. When it is detected that no device is connected, the bypass means bypasses the connection path of the electronic device and outputs a status signal indicating the presence or absence of connection compared to a relay device that uses an optical signal, or an optical signal. By eliminating the need for a circuit that converts the signal into an electrical signal, the size and cost can be reduced, and when the connection of the electronic device is confirmed, power is supplied to the electronic device. In addition to promptly starting up the system, power consumption is minimized.

(First embodiment)
FIG. 1 is a diagram for explaining an outline according to the first embodiment when the network relay device of the present invention is incorporated in, for example, a J / B (junction block: electrical junction box), and FIG. It is a figure for demonstrating the detail of a network relay apparatus.

  As shown in FIG. 1, network relay devices 20 to 50 corresponding to a plurality of electronic devices A to D are incorporated in a J / B (junction block: electrical connection box) 10. These network relay devices 20 to 50 relay electrical signals in a plurality of electronic devices A to D, for example, in a ring network, and switch network paths according to whether or not the electronic devices A to D are connected. In addition, when the power from the power line 11 is supplied to the electronic devices A to D, the type of the power source on each of the electronic devices A to D is determined.

  The network relay devices 20 to 50 and the electronic devices A to D are connected by communication lines 20a, 20b, 30a, 30b, 40a, 40b, 50a, and 50b in which communication is performed by electric signals, and the power supply lines 20c, 30c, 40c, and 50c supply power according to the electronic devices A to D, details of which will be described later. Here, the electrical signal may be either an analog signal or a digital signal. In the following description, an analog signal will be described.

  The network relay devices 20 to 50 are connected in a ring shape by the communication line 12. Accordingly, the electronic devices A to D are connected in a ring shape via the network relay devices 20 to 50, and the electronic devices A to D are synchronized between adjacent electronic devices A to D. By relaying the signal, for example, the signal is relayed in the order of electronic device A, electronic device B, electronic device C, electronic device D, and electronic device A.

  Next, details of the network relay devices 20 to 50 will be described. Since the configuration of each of the network relay devices 20 to 50 is the same, the network relay device 20 will be described as a representative.

  FIG. 2 shows the internal configuration of the network relay device 20, and a connector housing 21 to which a connector (not shown) on the electronic device A side is connected is provided. The connector housing 21 is provided with a plurality of pins. For example, the vacant pins are short-circuited by short-circuit circuits 22, 23, 24 as detection means having pull-down resistors 22a, 23a, 24a for every two poles. Yes.

  Further, one end of each pull-down resistor 22a, 23a, 24a is connected to a reference voltage Vcc, a multiplexer 25 as power supply means, and an OR circuit 26 as a logic circuit. The other end of each pull-down resistor 22a, 23a, 24a is grounded. Here, the multiplexer 25 supplies power corresponding to the electronic device A when it is detected by any one of the short circuits 22, 23, 24 that a connector (not shown) on the electronic device A side is connected. It is.

  That is, when it is detected by the short circuit 22 that a connector (not shown) on the electronic device A side is connected, one end of the pull-down resistor 22a becomes “H”, so that the multiplexer 25 uses, for example, the + B power supply as described above. It supplies to the electronic device A side via the supply line 20c.

  On the other hand, when it is detected by the short circuit 23 that a connector (not shown) on the electronic device A side is connected, one end of the pull-down resistor 23a is set to “H”, so that the multiplexer 25 supplies the ACC power supply, for example, as described above. Is supplied to the electronic device A via the power supply line 20c.

  Further, when it is detected by the short circuit 24 that a connector (not shown) on the electronic device A side is connected, one end of the pull-down resistor 24a is set to “H”, so that the multiplexer 25 uses, for example, the IG power supply as described above. It supplies to the electronic device A side via the supply line 20c.

  Therefore, by connecting a connector (not shown) on the electronic device A side to the connector housing 21, any of + B power source, ACC power source, and IG power source corresponding to the electronic device A side is automatically determined by the multiplexer 25. Will be supplied. In this case, if the power source to be supplied to the electronic device A side is, for example, a + B power source, the connector side (not shown) on the electronic device A side is utilized, for example, only by the short circuit path of the short circuit 22, and the other short circuit circuits 23, 24 are used. The short circuit path may be opened.

  Conversely, the connector side (not shown) on the electronic device A side may be configured to short the two poles of the empty pin corresponding to the short circuit 22 without short-circuiting the above-described empty pin of the connector housing 21. Good.

  Further, an analog switch 27 that is non-conductive (open) when the output of the OR circuit 26 is “H” and conductive (closed) when the output is “L” is connected to the output side of the OR circuit 26. Here, the OR circuit 26 and the analog switch 27 constitute bypass means. The OR circuit 26 takes the logic of the detection result of each short circuit 22, 23, 24, and when one end of one of the pull-down resistors 22a, 23a, 24a becomes "H", the output becomes "H". "

  On the other hand, when there is no change in the outputs of all the short-circuit circuits 22, 23, 24, the connector (not shown) on the electronic device A side is not connected to the connector housing 21, so the power supply by the multiplexer 25 is supplied. At the same time, the output of the OR circuit 26 becomes “L”, the analog switch 27 becomes conductive (closed), and the connection path of the electronic device A is bypassed.

  Therefore, if a connector (not shown) on the electronic device A side is connected to the connector housing 21, the corresponding power is supplied from the multiplexer 25 and the analog switch 27 becomes non-conductive (open). Signals are relayed between the devices B to D.

  Next, the operation of the network relay devices 20 to 50 will be described. In the following, for convenience of explanation, the network relay device 20 described above is represented. In the following, for example, + B power is supplied to the electronic device A side, ACC power is supplied to the electronic device B side, IG power is supplied to the electronic device C side, and the electronic device D side is supplied to the electronic device D side. For example, assume that + B power is supplied.

  First, when a connector (not shown) on the electronic device A side is connected to the connector housing 21 of the network relay device 20, the connection is detected by one of the short-circuit circuits 22, 23, 24.

  That is, if the power supply to be supplied to the electronic device A side is, for example, a + B power source, the connector side (not shown) on the electronic device A side makes use of, for example, only the short circuit path of the short circuit 22 and short-circuits the other short circuits 23 and 24. By being configured to open the path, it is detected by the short circuit 22 that a connector (not shown) on the electronic device A side is connected.

  At this time, one end of the pull-down resistor 22a of the short circuit 22 becomes “H”. As a result, the multiplexer 25 automatically determines + B power corresponding to the electronic device A side, and supplies + B power to the electronic device A side via the power supply line 20c described above.

  Similarly, assuming that the power supply to be supplied to the electronic device B side is, for example, an ACC power source, the connector side (not shown) on the electronic device B side uses, for example, only the short circuit path of the short circuit 23 and the other short circuit circuits 22 and 24 By being configured to open the short circuit path, it is detected by the short circuit 23 that a connector (not shown) on the electronic device B side is connected. Thereby, the multiplexer 25 automatically determines the ACC power source corresponding to the electronic device B side, and supplies the ACC power source to the electronic device B side via the power supply line 20c described above.

  Similarly, assuming that the power supply to be supplied to the electronic device C side is, for example, an IG power source, the connector side (not shown) on the electronic device C side uses, for example, only the short-circuit path of the short-circuit 24 and the other short-circuit circuits 22 and 23. By being configured to open the short circuit path, it is detected by the short circuit 24 that a connector (not shown) on the electronic device C side is connected. Thereby, the multiplexer 25 automatically determines the IG power source corresponding to the electronic device C side, and supplies the IG power source to the electronic device B side via the power supply line 20c described above.

  Similarly, if the power source to be supplied to the electronic device D side is, for example, a + B power source, the connector side (not shown) on the electronic device D side uses only the short circuit path of the short circuit 22, for example, By being configured to open the short circuit path, it is detected by the short circuit 22 that a connector (not shown) on the electronic device D side is connected. Thereby, the multiplexer 25 automatically determines + B power corresponding to the electronic device D side, and supplies + B power to the electronic device D side via the power supply line 20c described above.

  In this way, by connecting a connector (not shown) on the electronic equipment A, B, C, D side to the connector housing 21, the connection is detected by one of the short-circuit circuits 22, 23, 24, and the multiplexer 25. Thus, the power corresponding to each electronic device A, B, C, D is automatically determined and supplied.

  When the short circuit 22 detects that the connector (not shown) on the electronic device A side is connected to the connector housing 21, one end of the pull-down resistor 22 a of the short circuit 22 becomes “H”, and the other short circuit Since one end of the pull-down resistors 23a and 24a of 23 and 24 becomes “L”, the output from the OR circuit 26 becomes “H”. Thereby, the analog switch 27 becomes non-conductive (open).

  Similarly, when the short circuit 23 detects that the connector (not shown) on the electronic device B side is connected to the connector housing 21, one end of the pull-down resistor 23 a of the short circuit 23 becomes “H”, and the other short circuit Since one end of the pull-down resistors 22a and 24a of the circuits 22 and 24 becomes “L”, the output from the OR circuit 26 becomes “H”, and the analog switch 27 becomes non-conductive (open).

  Similarly, when the short circuit 24 detects that a connector (not shown) on the electronic device C side is connected to the connector housing 21, one end of the pull-down resistor 24a of the short circuit 24 becomes "H", and the other short circuit Since one end of the pull-down resistors 22a and 23a of the circuits 22 and 23 becomes “L”, the output from the OR circuit 26 becomes “H”, and the analog switch 27 becomes non-conductive (open).

  Similarly, when the short circuit 22 detects that the connector (not shown) on the electronic device D side is connected to the connector housing 21, one end of the pull-down resistor 22a of the short circuit 22 becomes "H", and the other short circuit Since one end of the pull-down resistors 23a and 24a of the circuits 23 and 24 becomes “L”, the output from the OR circuit 26 becomes “H”, and the analog switch 27 becomes non-conductive (open).

  Thus, if a connector (not shown) on the electronic device A, B, C, D side is connected to the connector housing 21, the multiplexer 25 supplies power corresponding to each, and the analog switches 27 are not connected. It becomes conductive (open), and as described above, for example, the signals are relayed in the order of electronic device A, electronic device B, electronic device C, electronic device D, and electronic device A.

  On the other hand, for example, if the connection between the connector housing 21 and the connector (not shown) on the electronic device A side is disconnected for some reason or is intentionally disconnected, the short circuit 22 causes the connector (not shown) on the electronic device A side to The connection will not be detected.

  In this case, since one end of the pull-down resistors 22a, 23a, 24a of all the short-circuit circuits 22, 23, 24 becomes “L”, the above-described power supply by the multiplexer 25 is automatically stopped.

  Further, since one end of the pull-down resistors 22a, 23a, 24a of all the short-circuit circuits 22, 23, 24 becomes “L”, the output from the OR circuit 26 becomes “L”, and the analog switch 27 becomes conductive (closed). Become. In this case, the connection path of the electronic device A is bypassed, and a ring-shaped route via the analog switch 27 is formed, and signals are transmitted in the order of the electronic device B, the electronic device C, the electronic device D, and the electronic device B. Will be relayed.

  Similarly, for example, when the connection between the connector housing 21 and the connector (not shown) on the electronic device B side is disconnected for some reason or is intentionally disconnected, the short circuit 23 connects the connector (not shown) on the electronic device B side. Is not detected, the supply of power described above by the multiplexer 25 is automatically stopped, and the analog switch 27 is turned on (closed), whereby the connection path of the electronic device B is bypassed, and the electronic device A The signals are relayed in the order of electronic device C, electronic device D, and electronic device A.

  Similarly, for example, when the connection between the connector housing 21 and the connector (not shown) on the electronic device C side is disconnected for some reason or is intentionally disconnected, the connection of the connector (not shown) on the electronic device C side is performed by the short circuit 24. Is not detected, the supply of the above-described power by the multiplexer 25 is automatically stopped, and the analog switch 27 is turned on (closed), whereby the connection path of the electronic device C is bypassed, and the electronic device A The signals are relayed in the order of electronic device B, electronic device D, and electronic device A.

  Similarly, for example, when the connection between the connector housing 21 and the connector (not shown) on the electronic device D side is disconnected for some reason or is intentionally disconnected, the short circuit 22 connects the connector (not shown) on the electronic device D side. Is not detected, and the supply of power described above by the multiplexer 25 is automatically stopped, and the analog switch 27 is turned on (closed), whereby the connection path of the electronic device D is bypassed, and the electronic device A The signals are relayed in the order of electronic device B, electronic device C, and electronic device A.

  Thus, in the first embodiment, the presence or absence of connection of the electronic devices A to D is detected by any one of the short circuits 22, 23, 24, and the electronic devices A to D are detected by any one of the short circuits 22, 23, 24. Is detected, the multiplexer 25 supplies power corresponding to each of the electronic devices A to D, and one of the short circuits 22, 23, 24 detects that the electronic devices A to D are not connected. Since the output from the OR circuit 26 becomes “L” and the analog switch 27 becomes conductive (closed), the connection path of the electronic devices A to D is bypassed. Compared with, it does not require a circuit that outputs a status signal indicating the presence or absence of a connection or converts an optical signal into an electrical signal, thus reducing the size and cost. Because the connection vessel A~D is powered to the electronic device A~D if it is confirmed, it can be minimized power consumption not only can perform a system boot quickly.

  In the first embodiment, the case where the pull-down resistors 22a, 23a, and 24a are used has been described, but it is needless to say that a pull-up resistor may be used. In this case, the multiplexer 25 can determine and supply power according to the output pulled up. Further, the analog switch can be controlled by replacing the OR circuit 26 with a NAND circuit.

(Second Embodiment)
FIG. 3 is a diagram illustrating a second embodiment when the configuration of the network relay device in FIG. 1 is changed. Note that, in the drawings described below, the same reference numerals are given to portions common to FIGS. 1 and 2.

  In the network relay device 20A shown in FIG. 3, power supply circuits (not shown) of the electronic devices A to D are provided at one end of the pull-down resistors 22a, 23a, 24a of the short circuits 22, 23, 24 instead of the reference voltage Vcc described above. Are connected directly. Further, the above-described multiplexer 25 is omitted.

  Incidentally, the electronic device A operates with the + B power source as described above, the electronic device B operates with the ACC power source as described above, the electronic device C operates with the IG power source as described above, and the electronic device D Shall operate with a + B power supply.

  In this case, when a connector (not shown) on the electronic device A side is connected to the connector housing 21, a + B power source is directly connected to one end of the pull-down resistor 22a. Similarly, when a connector (not shown) on the electronic device B side is connected to the connector housing 21, an ACC power source is directly connected to one end of the pull-down resistor 23a, and a connector (not shown) on the electronic device C side is connected to the connector housing 21. Is connected to one end of the pull-down resistor 24a, and an IG power source is connected to the connector housing 21. When a connector (not shown) on the electronic device D side is connected to the connector housing 21, a + B power source is connected to one end of the pull-down resistor 22a. Will be directly connected.

  In such a configuration, as described above, when connectors (not shown) on the electronic devices A to D side are connected to the connector housings 21, the short-circuit circuits 22, 23, corresponding to the electronic devices A to D, respectively. One end of each of the 24 pull-down resistors 22a, 23a, 24a becomes “H”, and each analog switch 27 becomes non-conductive (open) in the same manner as described above, thereby forming a ring-shaped path that does not pass through each analog switch 27. The

  Thereby, similarly to the above, each of the electronic devices A to D synchronously relays a signal between the adjacent electronic devices A to D, for example, the electronic device A, the electronic device B, the electronic device C, the electronic device D, Signals are relayed in the order of electronic device A.

  As described above, in the second embodiment, the connection status on the electronic device A to D side is detected by any one of the short circuits 22 to 24, and corresponds to any of the electronic devices A to D in which the connection is detected. Since a network can be configured by supplying power, it is possible to quickly start the system and to reduce power consumption and dark current during system operation.

  In the second embodiment, for example, when the application operates only with the + B power supply, for example, power is supplied only to the electronic devices A and D, and the system can be activated only by the electronic devices A and D. . In this case, the connection path between the electronic devices B and C is automatically bypassed.

  In the network relay devices 20 and 20A in the first embodiment and the second embodiment, they may be incorporated into a plurality of J / Bs (junction blocks) in the telecommunications system in the vehicle. Good.

  That is, for example, as shown in FIG. 4, electronic devices A, B, and C as first electronic devices are disposed in the vicinity of a seat at the front of the vehicle, and an electronic device D as a second electronic device is disposed in the trunk room at the rear of the vehicle. , E is arranged. In addition, it is assumed that a first J / B 60 as a first electric connection box is provided at the front of the vehicle, and a second J / B 61 as a second electric connection box is provided at the rear of the vehicle. Then, the network relay device 20 or 20A described above is incorporated into the first J / B 60 and the second J / B 61.

  The first J / B 60 and the second J / B 61 are connected by transmission lines 62 and 63 and an inline connector 64. The first J / B 60 and the second J / B 61 and the electronic devices A to E are connected by a transmission path 65.

  In such a telecommunications system, power corresponding to each of the electronic devices A to E is supplied to the first J / B 60 and the second J / B 61 according to the presence or absence of the connection, and the connection of the electronic devices A to E is performed. Depending on the presence or absence or the power-on status of each electronic device A to E, each electronic device A to E is connected in a ring shape, and each electronic device A to E is synchronized between adjacent electronic devices A to E. If any connection or power-on is not detected, the bypass path is configured and the power supply is stopped as described above.

  The network relay devices 20 and 20A in the first and second embodiments are not limited to the J / B (junction block) 60 and 61 in FIG. It may be incorporated in a connector.

  The present invention is not limited to the ring type but can be applied to other network forms such as a star type and a bus type.

It is a figure for demonstrating the outline | summary which concerns on 1st Embodiment at the time of incorporating the network relay apparatus of this invention, for example in J / B (junction Block: electrical junction box). It is a figure for demonstrating the detail of the network relay apparatus of FIG. It is a figure which shows 2nd Embodiment at the time of changing the structure of the network relay apparatus of FIG. It is a figure which shows the example at the time of incorporating the network relay apparatus of FIG. 1 or FIG. 2 in several J / B (junction Block: electrical junction box) in the telecommunication system in a vehicle. It is a figure for demonstrating the conventional relay apparatus. It is a figure for demonstrating the other conventional relay apparatus.

Explanation of symbols

10, 60, 61 J / B
DESCRIPTION OF SYMBOLS 11 Power supply line 20, 20A Network relay apparatus 20c Power supply line 21 Connector housing 22, 23, 24 Short circuit 22a, 23a, 24a Pull-down resistance 25 Multiplexer 26 OR circuit 27 Analog switch 62, 63, 65 Transmission path AE Electronic equipment

Claims (6)

A network relay device that connects a plurality of electronic devices to a ring network and relays electrical signals in each of the electronic devices,
Detecting means for detecting presence or absence of connection of the electronic device;
When connection of the electronic device is detected by the detection means, power supply means for supplying power to the electronic device;
A bypass means for bypassing the connection path of the electronic device when the detection means detects that the electronic device is not connected ;
The detection means is a plurality of short circuits that output different signals according to the connection status of the electronic device,
The power supply means is a multiplexer that determines and supplies power to be supplied to the electronic device according to an output from any one of the short circuits,
The bypass means includes a logic circuit that performs a logical sum of outputs of the plurality of short circuits, and a switch that opens or closes a connection path of the electronic device according to the output of the logic circuit,
Either of the short circuits outputs an H or L signal according to the connection status of the connector on the electronic device side,
The network relay device , wherein the logic circuit outputs a signal for closing the bypass means when there is no change in output from all the short circuits . A network relay device that connects a plurality of electronic devices to a ring network and relays electrical signals in each of the electronic devices,
Detecting means for detecting a power-on state of the electronic device side;
When it is detected by the detection means that the electronic device side is not turned on, bypass means for bypassing the connection path of the electronic device ,
The detection means is a plurality of short circuits that output different signals according to the connection status of the electronic device,
The bypass means includes a logic circuit that performs a logical sum of outputs of the plurality of short circuits, and a switch that opens or closes a connection path of the electronic device according to the output of the logic circuit,
Either of the short circuits outputs an H or L signal according to the connection status of the connector on the electronic device side,
The network relay device , wherein the logic circuit outputs a signal for closing the bypass means when there is no change in output from all the short circuits . A first electric connection box for connecting a plurality of first electronic devices and a second electric connection box for connecting a plurality of second electronic devices, and the first electric connection box and the second electric connection box are transmitted. A telecommunication system in which at least the plurality of first electronic devices and the plurality of second electronic devices are connected in a ring shape by being connected by a road,
The first electrical connection box and the second electrical connection box include a detection unit that detects the presence or absence of connection of the electronic device, and a power supply to the electronic device when the connection of the electronic device is detected by the detection unit. A power supply means for supplying, and a bypass means for bypassing a connection path of the electronic device when the detection means detects that the electronic device is not connected, and the detection means is connected to the electronic device. It is a plurality of short-circuits that output different signals depending on the situation, and the power supply means is a multiplexer that determines and supplies power to be supplied to the electronic device according to the output from any of the short-circuits The bypass means includes a logic circuit that performs a logical sum of outputs of the plurality of short circuits, and a circuit that opens or closes a connection path of the electronic device according to the output of the logic circuit. Any one of the short circuits outputs an H or L signal according to the connection status of the connector on the electronic device side, and the logic circuit outputs all of the short circuits. A telecommunications system comprising a network relay device that outputs a signal for closing the bypass means when there is no change . A first electric connection box for connecting a plurality of first electronic devices and a second electric connection box for connecting a plurality of second electronic devices, and the first electric connection box and the second electric connection box are transmitted. A telecommunication system in which at least the plurality of first electronic devices and the plurality of second electronic devices are connected in a ring shape by being connected by a road,
In the first electric junction box and the second electric junction box, when detecting that the electronic device side is not turned on by the detecting means for detecting the power-on state of the electronic device side and the detecting means Bypass means for bypassing the connection path of the electronic device , wherein the detection means is a plurality of short-circuits that output different signals depending on the connection status of the electronic device, and the bypass means includes the plurality of bypass circuits. A logic circuit that takes the logical sum of the outputs of the short circuit, and a switch that opens or closes the connection path of the electronic device according to the output of the logic circuit, and any one of the short circuits is the electronic device H or L signal is output according to the connection status of the connector on the side, and the logic circuit closes the bypass means when there is no change in the output from all the short circuits. Telecommunications system, characterized in that the network relay apparatus for outputting a signal is incorporated. A first joint connector that connects a plurality of first electronic devices and a second joint connector that connects a plurality of second electronic devices, and the first joint connector and the second joint connector are connected by a transmission line. A telecommunications system in which at least the plurality of first electronic devices and the plurality of second electronic devices are connected in a ring shape,
The first joint connector and the second joint connector are supplied with detection means for detecting the presence or absence of connection of the electronic device, and when the detection means detects the connection of the electronic device, power is supplied to the electronic device. A power supply means; and a bypass means for bypassing a connection path of the electronic device when the detection means detects that the electronic device is not connected, and the detection means is connected to the connection status of the electronic device. A plurality of short-circuits that output different signals according to the power supply means, a multiplexer that determines and supplies power to be supplied to the electronic device according to the output from any one of the short-circuits, The bypass means opens or opens a connection circuit of the electronic device according to an output of the logic circuit that takes a logical sum of outputs of the plurality of short circuits. One of the short circuits outputs an H or L signal depending on the connection status of the connector on the electronic device side, and the logic circuit outputs from all the short circuits. A telecommunications system comprising a network relay device that outputs a signal for closing the bypass means when there is no change . A first joint connector that connects a plurality of first electronic devices and a second joint connector that connects a plurality of second electronic devices, and the first joint connector and the second joint connector are connected by a transmission line. A telecommunications system in which at least the plurality of first electronic devices and the plurality of second electronic devices are connected in a ring shape,
The first joint connector and the second joint connector have detection means for detecting the power-on state of the electronic device side, and when the detection means detects that the electronic device-side power is not turned on, Bypass means for bypassing the connection path of the electronic device, the detection means is a plurality of short-circuits that output different signals depending on the connection status of the electronic device, and the bypass means is the plurality of short-circuits A logic circuit that takes a logical sum of the outputs of the circuit, and a switch that opens or closes a connection path of the electronic device in accordance with the output of the logic circuit, and any one of the short circuits is provided on the electronic device side The logic circuit outputs an H or L signal according to the connection status of the connector, and the logic circuit is connected to the bypass means when there is no change in output from all the short circuits. Telecommunications system, characterized in that the network relay apparatus for outputting a signal for over's are incorporated.

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