JP2010149609A - Power supply information transmission system and power supply information transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply information transmission system allowing reduction of communication lines between a power supply transmission device and a plurality of electronic devices and achieving of reduction of cables to be arranged in a vehicle, and the power supply information transmission device constituting the system. <P>SOLUTION: This power supply information transmission device 10 connected to a power source of the vehicle via a power line 5b supplies power from the power source to the plurality of electronic devices 30 via the power line 5b, acquires information on an ignition switch, information on an accessory switch and information on voltage of a battery of the power source or residual capacity, etc. A transmission circuit 13 superimposes the acquired information on the power line 5b and transmits the information to the electronic devices 30. The transmission circuit 13 generates a transmission signal that ASK modulation is performed for the information to be transmitted and superimposes the transmission signal on the power line 5b. The power supply information transmission device 10 detects the number of the electronic devices 30 connected to the power line 5b and performs an amplitude adjustment of the signal transmitted by the transmission circuit 13 and an impedance adjustment of the power line 5b according to the detection result. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides power to an electronic device from a power source such as a battery and an alternator mounted on a vehicle, and also states the voltage or remaining capacity of the battery and the ignition switch or accessory switch that regulates the operation / stop of the alternator. The present invention relates to a power supply information transmission system and a power supply information transmission apparatus capable of transmitting information related to a power source such as an electronic device.

  Conventionally, a vehicle is equipped with a large number of electronic devices. When the vehicle is running, power is supplied from an alternator that generates power by rotating the engine to the electronic device. When the vehicle engine is stopped, the electric power stored in the battery is electronic. Supplied to the device. In recent years, the number of electronic devices mounted on vehicles has increased in order to improve vehicle safety, convenience, comfort, and the like. Electric power is supplied from a power source such as a battery and an alternator to the electronic device via a power line laid on the vehicle.

  In addition, many electronic devices installed in the vehicle operate only when the vehicle ignition switch is turned on and the engine is running, and operate when the accessory switch is on even when the engine is stopped. There are various types, such as those that operate even when the accessory switch is off, and those that stop operation when the remaining capacity of the battery decreases. For this reason, it is necessary to give each electronic device information on the power source such as the state of the ignition switch, the state of the accessory switch, the voltage of the battery or the remaining capacity, and conventionally, the device that has acquired such information has a dedicated communication line or Information has been transmitted to a large number of electronic devices via in-vehicle LAN (Local Area Network) communication lines.

In Patent Document 1, an integrated control unit connected to a plurality of electrical component units through a power supply line and a communication line responds to the state of the battery and the ignition key and the power on / off information set in advance in the electrical component unit. In addition, a power on / off signal including an ID (IDentifier) is output to the communication line, and a communication IC (Integrated Circuit) of the electrical component unit responds to the power on / off signal including its own ID. There has been proposed an in-vehicle power management apparatus that can easily add an electrical component unit while reducing the volume of a power supply line by adopting a configuration for turning on / off the power.
JP 2004-280294 A

  With the increase in electronic devices mounted on vehicles, the number of power lines connecting power sources and electronic devices has increased, and the number of communication lines for transmitting information about power sources has increased. However, since the space in which cables such as power lines and communication lines can be laid in the vehicle is limited, it has recently been desired to reduce these cables. The on-vehicle power management device described in Patent Document 1 connects a plurality of electrical component units and an integrated control unit with a power supply line and a communication line, and it is not easy to reduce the number of cables.

  The present invention has been made in view of such circumstances, and the object of the present invention is to supply power information from a power source such as a battery and an alternator to an electronic device and to provide information on the power source. A power supply information transmission system capable of reducing communication lines and reducing the number of cables mounted on a vehicle by configuring the system so as to obtain and transmit to an electronic device without going through the communication line It is providing the power supply information transmitter which performs.

  A power supply information transmission system according to the present invention is connected to a power supply mounted on a vehicle via a power line, and supplies power from the power supply to another device via a power line. A power supply information acquisition unit having a power supply information acquisition unit, a transmission unit that transmits the information acquired by the power supply information acquisition unit superimposed on a power line that supplies power to another device, and a power line connected to the power supply information transmission device. And receiving means for extracting and receiving the information transmitted from the transmission means of the power supply information transmission apparatus from the power line, operating with the power supplied from the power supply means, and the receiving means And one or more electronic devices that operate according to the received information.

  In the power information transmission system according to the present invention, the transmission means transmits a signal obtained by amplitude-shift-modulating the information superimposed on a power line, and the power information transmission device is connected via the power line. Detecting means for detecting the number of connected electronic devices, amplitude adjusting means for adjusting the amplitude of the signal superimposed on the power line by the transmitting means, and the transmitting means according to the number of electronic devices detected by the detecting means; It further has impedance adjusting means for adjusting the impedance of the power line on which the signal is superimposed.

  In addition, the power information transmission system according to the present invention includes one resistor arranged in a transmission path from the transmission unit to the electronic device, and one or a plurality of other ones that can be connected / disconnected in parallel to the one resistor. And the amplitude adjusting means connects / disconnects the other resistors according to the number of electronic devices detected by the detecting means.

  The power information transmission system according to the present invention includes one coil arranged in a power supply path from the power supply means to the electronic device, and one or a plurality of coils that can be connected / disconnected in parallel to the one coil. The impedance adjusting means connects / disconnects the other coils according to the number of electronic devices detected by the detecting means.

  In addition, a power information transmission system according to the present invention is connected to a power source mounted on a vehicle via a power line, and supplies power from the power source to another device via the power line. A power source information acquiring unit for acquiring information; a power source information transmitting device having a transmitting unit for wirelessly transmitting information acquired by the power source information acquiring unit; and the power source information transmitting device connected to the power source information transmitting device via a power line, the power source information The transmission unit of the transmission device has a reception unit that receives information transmitted by radio, operates with the power supplied from the power supply unit, and operates according to the information received by the reception unit And an electronic device.

  The power information transmission system according to the present invention is characterized in that the power information transmission device is mounted on an electric connection box having a terminal portion for connecting a plurality of power lines and branching the power lines.

  Further, in the power information transmission system according to the present invention, the information acquired by the power information acquisition means includes the voltage or remaining capacity of the battery mounted on the vehicle, the state of the ignition switch of the vehicle, and / or the accessory switch of the vehicle. It contains the information which concerns on the state of this.

  The power source information transmitting device according to the present invention is connected to a power source mounted on a vehicle via a power line, and supplies power from the power source to another device via the power line, and the power source. It is characterized by comprising power supply information acquisition means for acquiring such information, and transmission means for transmitting the information acquired by the power supply information acquisition means superimposed on a power line for supplying power to other devices.

  The power source information transmitting device according to the present invention is connected to a power source mounted on a vehicle via a power line, and supplies power from the power source to another device via the power line, and the power source. Power supply information acquisition means for acquiring such information and transmission means for wirelessly transmitting information acquired by the power supply information acquisition means.

  In the present invention, the power source information transmitting device connected to the power source mounted on the vehicle via the power line supplies the power from the power source to the electronic device of the vehicle via the power line, and acquires information about the power source, The acquired information is superimposed on the power line and transmitted to the electronic device. The electronic device receives power supply from the power supply information transmission device via the power line, and receives information related to the power supply by extracting information superimposed on the power line. This eliminates the need to provide a signal line for transmitting and receiving information about the power supply between the power supply information transmitting apparatus and the electronic apparatus.

In the present invention, the power supply information transmitting apparatus generates a signal obtained by amplitude-shift keying (hereinafter referred to as ASK (Amplitude-Shift Keying) modulation) of information related to the power supply, and superimposes the signal on the power line to the electronic apparatus. The transmission is configured. At this time, when the number of receiving-side electronic devices connected to the power line increases or decreases, the impedance of the communication path (that is, the power line) of the power line communication may increase or decrease, and the amplitude of the signal due to ASK modulation may increase or decrease.
Therefore, the power supply information transmitting device detects the number of electronic devices connected to the power line, adjusts the amplitude of the signal superimposed on the power line according to the detected number, and adjusts the impedance of the power line. The number of electronic devices can be detected by, for example, broadcasting the power information transmitting device to all the electronic devices connected to the power line and acquiring a response from each electronic device. The number of electronic devices may be detected when the vehicle is shipped from the factory, or may be detected at a predetermined timing such as every time the vehicle engine is started.
By performing amplitude adjustment and impedance adjustment according to the number of electronic devices connected to the power line, it is possible to accurately transmit and receive ASK-modulated signals through the power line, thereby improving the reliability of power line communication and communication. It is possible to improve the reliability of the operation of the electronic device according to the above.

  In the present invention, a resistor is arranged in the transmission path from the transmission means of the power supply information transmission device to the electronic device, and one or more resistors that can be connected / disconnected in parallel with this resistor are arranged. That is, the power supply information transmitting apparatus can adjust the resistance value of the transmission path of the ASK modulated signal by adjusting the number of resistors connected in parallel. As a result, the power information transmitting device can adjust the resistance value according to the number of electronic devices and adjust the amplitude of the transmission signal.

  In the present invention, a coil is arranged in the power supply path from the power supply means of the power supply information transmitting apparatus to the electronic apparatus, and one or more coils that can be connected / disconnected in parallel with this coil are arranged. As a result, the power supply information transmitting device can adjust the impedance of the power supply path by adjusting the number of coils connected in parallel, and therefore can adjust the impedance according to the number of electronic devices.

  In the present invention, the power source information transmitting device connected to the power source mounted on the vehicle via the power line supplies the power from the power source to the electronic device of the vehicle via the power line, and acquires information on the power source. Then, the acquired information is wirelessly transmitted to the electronic device. The electronic device receives power supply from the power supply information transmission device via the power line, and acquires information related to the power supply by receiving wirelessly transmitted information. This eliminates the need to provide a signal line for transmitting and receiving information about the power supply between the power supply information transmitting apparatus and the electronic apparatus.

  Moreover, in this invention, a power supply information transmission apparatus is mounted in the electrical junction box (what is called a junction box) for branching a power line. The electrical connection box has a plurality of terminal portions for connecting power lines. For example, a power line from a power source such as a battery and an alternator is connected to one terminal portion, and a power line to an electronic device is connected to the other plurality of terminal portions. Are connected to each other to distribute the power from the power source to the electronic devices. By mounting the power supply information transmission device on the electrical junction box, the power supply information transmission device can easily manage the power supply to the electronic device connected to the electrical junction box, and the power supply such as the battery voltage or remaining capacity The information regarding can be easily acquired.

  In the present invention, the information acquired by the power supply information transmitting device and transmitted to the electronic device includes the voltage of the battery mounted on the vehicle, the remaining capacity of the battery, the on / off state of the ignition switch of the vehicle, and / Or information such as the on / off state of the accessory switch of the vehicle. These pieces of information are information relating to the power supply of the vehicle, and the power supply information transmitting device transmits these pieces of information to the electronic device, so that the electronic device can perform an operation suitable for the state of the power supply.

  In the case of the present invention, the power information transmission device supplies power to the electronic device from a power source such as a battery and an alternator, acquires information about the power source, and transmits the acquired information to the electronic device by power line communication or wireless communication. By adopting the configuration, it is possible to transmit information from the power supply information transmission device to the electronic device without going through the communication line, so there is no need to arrange a communication line between the power supply information transmission device and the electronic device. It is possible to reduce the number of cables mounted on the cable.

(Embodiment 1)
Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. FIG. 1 is a block diagram showing a configuration of a power information transmission system according to the present invention. In this figure and subsequent figures, the power supply path is indicated by a solid line, and the signal transmission path is indicated by a broken line. In the figure, 1 is an alternator mounted on a vehicle (not shown), and 2 in the figure is a battery mounted on the vehicle. The alternator 1 has a generator that converts kinetic energy generated by the operation of a vehicle engine into electric energy, and a rectifier circuit that converts an AC voltage output from the generator into a DC voltage. Power is supplied to the devices connected through the network. The battery 2 is connected to the alternator 1 via the power line 5a and accumulates the electric power supplied from the alternator 1, and accumulates when the engine of the vehicle stops and the power generation by the alternator 1 stops. Electric power is supplied to a device connected to the power line 5a. The alternator 1 and the battery 2 are power sources that supply power to other devices mounted on the vehicle.

  Electric power supplied from the alternator 1 and the battery 2 is supplied to a plurality of electronic devices 30 mounted on the vehicle via the junction box 3. Specifically, the alternator 1 and the battery 2 are connected to the terminal 4a of the junction box 3 through the power line 5a, and the plurality of electronic devices 30 are connected to the plurality of terminals 4b of the junction box 3 through the power line 5b. The junction box 3 is a device for branching a cable such as a power line or a communication line, and distributes power, a signal or the like input to the terminal 4a on the input side to a plurality of terminals 4b on the output side.

  Further, the junction box 3 of the present system performs control for switching on / off the power supply from the power sources of the alternator 1 and the battery 2 to the plurality of electronic devices 30 and transmits / receives information to / from the electronic device 30. A power information transmission device 10 is provided. The power source information transmitting apparatus 10 is connected to the input side terminal 4a of the junction box 3 and is connected to all of the plurality of output side terminals 4b, and controls connection / cutoff between the input side and the output side. To turn on / off the power supply.

  Further, the power supply information transmitting device 10 is provided with information relating to on / off of the ignition switch 7 of the vehicle (hereinafter referred to as IG information) and information relating to on / off of the accessory switch 8 (hereinafter referred to as ACC information). Yes. These IG information and ACC information may be configured to be transmitted / received by connecting a dedicated communication line to the junction box 3, or may be configured to be transmitted / received via a network such as an in-vehicle LAN. The power supply information transmitting device 10 sends the given IG information and ACC information, and information such as the power supply voltage and the remaining capacity of the battery 2 to the plurality of electronic devices 30 connected to the junction box 3 via the power line 5b. It has a function to transmit by power line communication.

  FIG. 2 is a block diagram showing a configuration of power supply information transmitting apparatus 10 according to Embodiment 1 of the present invention. The power information transmission device 10 includes a power I / F (interface) unit 11, a CPU (Central Processing Unit) 12, a transmission circuit 13, a reception circuit 14, an LPF (Low Pass Filter) 15, a BPF (Band Pass Filter) 16, and An adjustment circuit 18 and the like are provided.

  The power I / F unit 11 is connected to the power line 5 a from the power source, and the power line 5 b to the electronic device 30 is connected via the LPF 15. The power I / F unit 11 supplies the power supplied from the power source via the power line 5a to the CPU 12 and other circuits of the power information transmitting apparatus 10. The power I / F unit 11 includes a switch 11 a that connects / cuts off the power line 5 a and the power line 5 b, and can control power supply from the power source to the electronic device 30.

  Although not shown, the power I / F unit 11 has a sensor that detects the voltage of the power supplied from the power source, and can thereby acquire the voltage or remaining capacity of the battery 2, Information about the battery 2 is notified to the CPU 12. A signal line is connected to the power I / F 11, information such as IG information and ACC information can be received, and the received information is notified to the CPU 12. That is, the power I / F unit 11 provides the CPU 12 with information related to the power source (hereinafter referred to as power source information) such as IG information, ACC information, the voltage of the battery 2 or the remaining capacity.

  The CPU 12 is provided with IG information, ACC information, power supply information such as the voltage or remaining capacity of the battery 2 from the power I / F unit 11, transmitted from the electronic device 30 through power line communication, and received by the receiving circuit 14. Information is given. The CPU 12 controls on / off of the switch 11 a included in the power I / F unit 11 based on the power supply information from the power I / F unit 11 and the reception information from the reception circuit 14. For example, when the remaining capacity of the battery 2 becomes equal to or less than a predetermined amount, the CPU 12 can turn off the switch 11a to stop the power supply to the electronic device 30. Further, the CPU 12 can transmit the power supply information supplied from the power I / F unit 11 to the transmission circuit 13, thereby transmitting to the electronic device 30 by power line communication.

  The transmission circuit 13 is a circuit that generates transmission signals by ASK-modulating transmission information given from the CPU 12, and transmits information to the electronic device 30 by superimposing the generated transmission signals on the power line 5b. The receiving circuit 14 is a circuit that receives and extracts the transmission signal from the electronic device 30 superimposed on the power line 5b, demodulates the received signal, and converts the received signal into reception information, and provides the reception information to the CPU 12. The transmission circuit 13 is connected to the power line 5b via the adjustment circuit 18 and the BPF 16, and the reception circuit 14 is connected to the power line 5b via the BPF 16. Although details will be described later, the adjustment circuit 18 is a circuit for adjusting the amplitude of the transmission signal output from the transmission circuit 13.

  The LPF 15 is arranged in a power supply path from the power I / F unit 11 to the electronic device 30. The LPF 15 is a filter that removes high-frequency components and allows only low-frequency components to pass, and prevents high-frequency noise generated in the power I / F unit 11 and the like so as not to hinder power line communication using the power line 5b. Remove. Although details will be described later, the LPF 15 included in the power supply information transmitting apparatus 10 according to the present invention has a function of adjusting the impedance of the power line 5b.

  The BPF 16 is a filter that passes only signals in a predetermined specific frequency range (pass band) and removes signals having frequencies outside the range. The pass band of the BPF 16 is determined according to the frequency of the signal of the power line communication transmitted / received between the power supply information transmitting device 10 and the electronic device 30, and allows the signal for the power line communication to pass, Communication accuracy is improved by blocking frequency signals.

  FIG. 3 is a block diagram showing a configuration of electronic device 30 of the power information transmission system according to Embodiment 1 of the present invention. Although the power supply information transmission system includes a plurality of electronic devices 30, since these have substantially the same configuration, only one electronic device 30 is shown in detail, and details of the other electronic devices 30 are omitted. . The electronic device 30 includes a power supply circuit 31, a switch 32, an IC (Integrated Circuit) 33, a CPU 34, an LPF 35, a BPF 36, a transmission circuit 37, a reception circuit 38, and the like.

  The power supply circuit 31 is connected to the power line 5b via the LPF 35, and supplies the power supplied from the power supply information transmitting device 10 to the CPU 34 and other ICs 33 of the electronic device 30. The power supply circuit 31 directly supplies power to the CPU 34, but supplies power to the other ICs 33 via the switch 32, and connection / cutoff of the switch 32 is controlled by the CPU 34.

  The CPU 34 is supplied with the power supply information transmitted from the power supply information transmitting apparatus 10 via the power line 5b from the reception circuit 38, and controls connection / disconnection of the switch 32 based on the provided power supply information. Further, the CPU 34 can perform information transmission by power line communication by providing the transmission circuit 37 with information to be transmitted to the power information transmission apparatus 10 or another electronic apparatus 30. For example, based on the ACC information of the received power supply information, the CPU 34 connects the switch 32 when the accessory switch 8 is on, and performs control to shut off the switch 32 when the accessory switch 8 is off. The power consumption when 8 is OFF can be reduced. Further, for example, based on the received IG information, the CPU 34 may be configured to connect the switch 32 when the ignition switch 7 is on and to shut off the switch 32 when the ignition switch 7 is off. Based on the remaining capacity, the switch 32 may be shut off when the remaining capacity falls below a predetermined capacity.

  The transmission circuit 37 is a circuit similar to the transmission circuit 13 of the power supply information transmission apparatus 10, and is a circuit that performs transmission by ASK-modulating information given from the CPU 34 and superimposing it on the power line 5b. The receiving circuit 38 is a circuit similar to the receiving circuit 14 of the power supply information transmitting apparatus 10, and is a circuit that receives the signal superimposed on the power line 5b by receiving it, demodulates the received signal, and gives it to the CPU 34. The transmission circuit 37 and the reception circuit 38 are connected to the power line 5b via the BPF 36.

  The LPF 35 is a filter that is disposed in the power supply path from the power supply information transmitting device 10 to the power supply circuit 31 of the electronic device 30 and that removes high frequency components and allows only low frequency components to pass. The BPF 36 is a circuit similar to the BPF 16 of the power supply information transmitting apparatus 10 and is a filter that allows only a signal having a predetermined passband frequency to pass and blocks a signal having a frequency outside the passband.

  In the power information transmission system according to the present invention, the power information transmission device 10 detects the number of electronic devices 30 connected to the power line 5b by using power line communication via the power line 5b, and the detected number. The function of adjusting the impedance of the power line 5b and adjusting the amplitude of the transmission signal transmitted by the transmission circuit 13 is provided. Hereinafter, impedance adjustment and amplitude adjustment performed by the power supply information transmitting apparatus 10 will be described.

  FIG. 4 is a schematic diagram for explaining impedance adjustment and amplitude adjustment performed by the power supply information transmitting apparatus 10 according to Embodiment 1 of the present invention. FIG. 4A shows a circuit configuration of the LPF 15 of the power supply information transmitting apparatus 10. (B) shows the circuit configuration of the adjustment circuit 18 of the power supply information transmitting apparatus 10. The LPF 15 includes a coil L0 disposed in the power supply path from the power I / F unit 11 to the electronic device 30, and a capacitor C disposed between one end of the coil L0 on the electronic device 30 side and the ground potential. This is a filter by an LC circuit configured as described above.

  The coil L0 is connected in parallel with a coil L1 and a switch SW1, a coil L2 and a switch SW2, and a coil L3 and a switch SW3 connected in series. Connection / disconnection of the switches SW1 to SW3 is controlled by the CPU 12 of the power supply information transmitting apparatus 10, and the other coils L1 to L1 connected in parallel to the coil L0 when the CPU 12 controls the number of switches SW1 to SW3 to be connected. The number of L3 can be adjusted. That is, the power supply information transmitting apparatus 10 can adjust the impedance of the power line 5b by adjusting the number of coils L1 to L3 to be connected.

  The adjustment circuit 18 has a resistor R0 arranged in the communication path between the transmission circuit 13 and the BPF 16. A resistor R1 and a switch SW4 connected in series, a resistor R2 and a switch SW5, and a resistor R3 and a switch SW6 are connected in parallel to the resistor R0. Connection / disconnection of the switches SW4 to SW6 is controlled by the CPU 12 of the power supply information transmitting apparatus 10, and the CPU 12 controls the number of switches SW4 to SW6 to be connected, whereby another resistor R1 connected in parallel to the resistor R0. The number of ~ R3 can be adjusted. That is, the power supply information transmitting apparatus 10 can adjust the resistance value of the communication path by adjusting the number of resistors R1 to R3 to be connected, and the transmission signal output from the transmission circuit 13 by changing the resistance value. The amplitude can be adjusted.

  FIG. 5 is a schematic diagram for explaining impedance adjustment and amplitude adjustment performed by the power supply information transmitting apparatus 10 according to the first embodiment of the present invention, and the number of electronic devices 30 (number of connections) connected to the power line 5b. The correspondence relationship between the number of coils L0 to L3 connected in parallel by the LPF 15 and the number of resistors R0 to R3 connected in parallel by the adjustment circuit 18 is shown as a table. When the number of electronic devices 30 connected to the power line 5b is large, the power source information transmitting apparatus 10 has a large load on the power line 5b related to the transmission circuit 13, and thus the number of connections of the coils L0 to L3 of the LPF 15 is reduced. The number of connections of the resistors R0 to R3 of the adjustment circuit 18 is increased to reduce the resistance value.

  Further, when the number of electronic devices 30 connected to the power line 5b is small, the power source information transmitting device 10 increases the number of connections of the coils L0 to L3 of the LPF 15 because the load on the power line 5b for the transmission circuit 13 is small. At the same time, the number of connections of the resistors R0 to R3 of the adjustment circuit 18 is reduced to increase the resistance value. Accordingly, the power source information transmitting apparatus 10 can add / delete a load to / from the power line 5b according to the load of the electronic apparatus 30 connected to the power line 5b. It is possible to prevent the amplitude of the transmission signal output from the transmission circuit 13 from fluctuating.

  FIG. 6 is a flowchart showing a procedure of processing performed by power supply information transmitting apparatus 10 according to Embodiment 1 of the present invention before starting power line communication. CPU 12 of power supply information transmitting apparatus 10 performs operations by controlling the operation of each unit. It is processing. This process is started when, for example, the ignition switch 7 of the vehicle is turned on. First, the power source information transmitting apparatus 10 detects the number of electronic devices 30 connected to the power line 5b (step S1). For example, the number of connections of the electronic device 30 is detected by transmitting a message by broadcast from the transmission circuit 13 of the power information transmission device 10 to all the electronic devices 30 by power line communication, and receiving a response to the message by the reception circuit 14. And by examining the number of responses received.

  The power source information transmitting apparatus 10 stores in advance the correspondence between the number of electronic devices 30 as shown in FIG. 5 and the number of coils L0 to L1 and resistors R0 to R3. After detecting the number of connections of the electronic device 30, the CPU 12 of the power supply information transmitting device 10 switches the connection / disconnection of the switches SW1 to SW3 of the LPF 15 according to the detected number of connections and adjusts the number of connections of the coils L0 to L3. Thus, the impedance of the power line 5b is adjusted (step S2). Next, the CPU 12 switches connection / cutoff of the switches SW4 to SW6 of the adjustment circuit 18 according to the detected number of connections, and adjusts the number of connections of the resistors R0 to R3, thereby adjusting the amplitude of the transmission signal output from the transmission circuit 13. Is performed (step S3).

  After completing the impedance adjustment and the amplitude adjustment, the CPU 12 of the power supply information transmitting device 10 transmits the power supply information to the electronic device 30 via the power line 5b by the transmission circuit 13 and the information from the electronic device 30 by the receiving circuit 14. Communication processing such as reception is started (step S4), and the processing before the start of power communication is ended.

  In the power supply information transmission system having the above-described configuration, the power supply information transmission device 10 connected to the power sources such as the alternator 1 and the battery 2 of the vehicle via the power line 5a transmits the power from the power source to the plurality of electronic devices 30. The power supply information such as the IG information, the ACC information, the voltage of the battery 2 or the remaining capacity, and the transmission circuit 13 transmits the acquired information to the electronic device 30 superimposed on the power line 5b. By doing so, it is not necessary to use a dedicated communication line when transmitting and receiving information on the power supply between the power supply information transmitting apparatus 10 and the electronic apparatus 30, so that the cable arranged between the power supply information transmitting apparatus 10 and the electronic apparatus 30 Can be reduced.

  In addition, the transmission circuit 13 of the power information transmission device 10 generates a transmission signal obtained by ASK-modulating information to be transmitted and superimposes the transmission signal on the power line 5b, and detects the number of electronic devices 30 connected to the power line 5b. By adjusting the amplitude of the signal transmitted by the transmission circuit 13 and adjusting the impedance of the power line 5b according to the detected number of connections, the amplitude of the transmission signal can be changed by increasing or decreasing the number of connections of the electronic device 30. The reliability of power line communication by ASK modulation can be improved.

  In addition, a coil L0 is arranged in the power supply path from the power I / F unit 11 of the power supply information transmitting apparatus 10 to the electronic device 30, and a plurality of coils L1 to L3 that can be connected / disconnected in parallel are arranged in the coil L0. Thus, the CPU 12 of the power supply information transmitting device 10 adjusts the number of the coils L0 to L3 according to the detected number of connected electronic devices 30, so that the power supply information transmitting device 10 can easily adjust the impedance of the power line 5b. Can be done.

  Similarly, a resistor R0 is arranged in the transmission path from the transmission circuit 13 of the power supply information transmitting device 10 to the electronic device 30, and a plurality of resistors R1 to R3 that can be connected / disconnected in parallel are arranged on the resistor R0 for detection. By configuring the CPU 12 of the power supply information transmitting device 10 to adjust the number of resistors R0 to R3 according to the number of connected electronic devices 30, the power supply information transmitting device 10 adjusts the resistance value of the transmission path to adjust the transmission circuit. Thus, the amplitude adjustment of the transmission signal output from 13 can be easily performed.

  In addition, by adopting a configuration in which the power supply information transmitting device 10 is mounted on the junction box 3 for branching the power line distributed to the vehicle, the power for the plurality of electronic devices 30 connected to the junction box 3 via the power line 5b. Supply can be easily managed, and information relating to the power source such as the voltage or remaining capacity of the battery 2 can be easily obtained.

  Further, the power information transmitting device 10 acquires and transmits information such as the on / off state of the ignition switch 7 (IG information), the on / off state of the accessory switch 8 (ACC information), the voltage of the battery 2 or the remaining capacity, etc. By configuring the circuit 13 to transmit to the electronic device 30, the electronic device 30 performs an operation according to the power supply state such as start / stop of operation and transition to the power saving mode based on information on these power supplies. be able to.

  In the present embodiment, the power source information transmitting device 10 is mounted on the junction box 3 of the vehicle. However, the present invention is not limited to this, and the power source information transmitting device 10 may be mounted on other devices. The power supply information transmitting device 10 may be mounted on the vehicle as a single device. 1 to 3, the configuration in which the four electronic devices 30 are connected to the power source information transmitting device 10 via the power line 5b is shown. However, the configuration is not limited to this, and three or less or five or more electrons are included. The apparatus 30 may be connected. The LPF 15 has four coils L0 to L3. However, the present invention is not limited to this, and may have three or less or five or more coils. Similarly, although the adjustment circuit 18 has a configuration including four resistors R0 to R3, the configuration is not limited thereto, and may be a configuration including three or less resistors or five or more resistors. Information transmitted from the power supply information transmitting device 10 to the electronic device 30 by power line communication includes the on / off state of the ignition switch 7 (IG information), the on / off state of the accessory switch 8 (ACC information), and the voltage of the battery 2. Alternatively, information such as remaining capacity (power supply information) is used, but the present invention is not limited to this, and other information may be transmitted.

(Modification)
7 and 8 are schematic diagrams for explaining the impedance adjustment and the amplitude adjustment performed by the power supply information transmitting apparatus 10 according to Embodiment 1 of the present invention. FIG. The circuit configuration of the LPF 15a is shown, and FIG. 7B shows the circuit configuration of the adjustment circuit 18a of the power supply information transmitting apparatus 10. FIG. 8 is a table showing the correspondence between the number of electronic devices 30 (number of connections) connected to the power line 5b, the coils selected by the LPF 15a, and the resistance selected by the adjustment circuit 18a. is there.

The LPF 15a includes four coils L11 to L14, a switch SW11, and a capacitor C. The switch SW11 is a four-contact switch, and can selectively connect any one of the four coils L11 to L14 to the power line 5b. One end of each of the four coils L11 to L14 is connected to the terminal of the switch SW11, and the other end is connected to a power supply path to the power I / F unit 11. The four coils L11 to L14 have different inductance values, and assuming that the inductances of the coils L11 to L14 are L11 to L14, respectively, the inductance values of the coils L11 to L14 have the relationship of the following expression (1). Is set.
L11 = 2 × L12 = 3 × L13 = 4 × L14 (1)

The adjustment circuit 18a includes four resistors R11 to R14 and a switch SW12. The switch SW12 is a four-contact switch having the same configuration as the switch SW11 of the LPF 15a, and can selectively connect any one of the four resistors R11 to R14 to the communication path to the BPF 16. One end of each of the four resistors R11 to R14 is connected to the terminal of the switch SW12, and the other end is connected to a communication path to the transmission circuit 13. The four resistors R11 to R14 have different resistance values. If the resistance values of the resistors R11 to R14 are R11 to R14, respectively, the resistance values of the resistors R11 to R14 are set to have the relationship of the following expression (2). Has been.
4 × R11 = 3 × R12 = 2 × R13 = R14 (2)

  When the power supply information transmitting apparatus 10 has a large number of electronic devices 30 connected to the power line 5b, the load on the power line 5b for the transmission circuit 13 is large. Therefore, the switches SW11 of the LPF 15a are switched and the coils L1 to L4 having large inductances are switched. And the switch SW12 of the adjustment circuit 18a is switched to connect the resistors R1 to R4 having a small resistance value. In addition, when the number of electronic devices 30 connected to the power line 5b is small, the power source information transmitting apparatus 10 has a small load on the power line 5b with respect to the transmission circuit 13, so the switch L11 of the LPF 15a is switched to change the coil L1 having a small inductance. To L4 and the switch SW12 of the adjustment circuit 18a is opened to connect the resistors R11 to R14 having a large resistance value.

  As a result, the amount of load connected to the power line 5b by the power source information transmitting apparatus 10 can be increased or decreased according to the load of the electronic apparatus 30 connected to the power line 5b. It is possible to prevent the amplitude of the transmission signal output from the circuit 13 from fluctuating.

  The inductance values of the four coils L11 to L14 satisfy the relationship of the above expression (1). However, this is an example, and it is sufficient that at least the relationship of L11> L12> L13> L14 is satisfied. . Similarly, the resistance values of the four resistors R11 to R14 satisfy the relationship of the above expression (2). However, this is an example, and it is sufficient that at least the relationship of R11 <R12 <R13 <R14 is satisfied. .

(Embodiment 2)
FIG. 9 is a block diagram showing a configuration of power supply information transmitting apparatus 210 according to Embodiment 2 of the present invention, and FIG. 10 shows a configuration of electronic apparatus 230 of the power supply information transmitting system according to Embodiment 2 of the present invention. FIG. The power supply information transmission system according to Embodiment 1 is configured to supply power via the power line 5b and to transmit information about the power supply from the power supply information transmission device 10 to the electronic device 30 via the power line 5b by power line communication. . On the other hand, the power supply information transmission system according to the second embodiment is the same as the power supply information transmission system according to the first embodiment in that power is supplied via the power line 5b. The difference is that the power information transmitting device 210 transmits the information to the electronic device 230.

  The power supply information transmission apparatus 210 according to the second embodiment includes an antenna 220 connected to the transmission circuit 13 and the reception circuit 14. The transmission circuit 13 modulates the information provided from the CPU 12 into a signal suitable for wireless transmission, and outputs the signal to the antenna 220 to perform wireless transmission to the electronic device 230. The receiving circuit 14 receives the radio signal transmitted from the electronic device 230 by the antenna 220 and supplies the CPU 12 with information obtained by demodulating the received signal.

  The electronic device 230 includes an antenna 239 connected to the transmission circuit 37 and the reception circuit 38. The receiving circuit 38 receives the radio signal transmitted from the power information transmitting apparatus 210 by the antenna 239 and gives the information obtained by demodulating the received signal to the CPU 34. The transmission circuit 37 modulates the information provided from the CPU 34 into a signal suitable for wireless transmission, and outputs the signal to the antenna 239 to perform wireless transmission to the power information transmitting apparatus 210.

  Accordingly, the power information transmission device 210 can transmit information such as the IG information, the ACC information, and the power information acquired by the power I / F unit 11 to the plurality of electronic devices 230 by wireless transmission. The electronic device 230 can control power supply to the IC 33 by switching connection / disconnection of the switch 32 based on information received wirelessly. The power supply device 210 and the plurality of electronic devices 230 need only be connected via the power line 5b, and there is no need to provide a communication line for transmitting and receiving information. Therefore, similarly to the power information transmission system according to the first embodiment, the power information transmission system according to the second embodiment can reduce the number of cables arranged between the power information transmission device 210 and the electronic device 230. .

  In addition, since the other structure of the power supply information transmission system which concerns on Embodiment 2 is the same as that of the structure of the power supply information transmission system which concerns on Embodiment 1, the same code | symbol is attached | subjected to the same location and detailed description Is omitted.

It is a block diagram which shows the structure of the power supply information transmission system which concerns on this invention. It is a block diagram which shows the structure of the power supply information transmission apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the electronic device of the power supply information transmission system which concerns on Embodiment 1 of this invention. It is a schematic diagram for demonstrating the impedance adjustment and amplitude adjustment which the power supply information transmission apparatus which concerns on Embodiment 1 of this invention performs. It is a schematic diagram for demonstrating the impedance adjustment and amplitude adjustment which the power supply information transmission apparatus which concerns on Embodiment 1 of this invention performs. It is a flowchart which shows the procedure of the process which the power supply information transmission apparatus which concerns on Embodiment 1 of this invention performs before power line communication start. It is a schematic diagram for demonstrating the impedance adjustment and amplitude adjustment which the power supply information transmission apparatus which concerns on Embodiment 1 of this invention performs. It is a schematic diagram for demonstrating the impedance adjustment and amplitude adjustment which the power supply information transmission apparatus which concerns on Embodiment 1 of this invention performs. It is a block diagram which shows the structure of the power supply information transmission apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of the electronic device of the power supply information transmission system which concerns on Embodiment 2 of this invention.

Explanation of symbols

1 Alternator (power supply)
2 Battery (Power)
3 Junction box (electric junction box)
4a, 4b Terminals 5a, 5b Power line 7 Ignition switch 8 Accessory switch 10 Power source information transmitter 11 Power I / F unit (power source information acquisition means)
11a switch (power supply means)
12 CPU (detection means)
13 Transmission circuit (transmission means)
14 Receiving circuit 15, 15a LPF (impedance adjusting means)
16 BPF (transmission means)
18, 18a Adjustment circuit (amplitude adjustment means)
30 Electronic Device 31 Power Supply Circuit 32 Switch 33 IC
35 LPF
36 BPF (receiving means)
37 transmitting circuit 38 receiving circuit (receiving means)
210 Power supply information transmission device 220 Antenna (transmission means)
230 Electronic device 239 Antenna (receiving means)
L0 to L3 Coil L11 to L14 Coil R0 to R3 Resistor R11 to R14 Resistor SW1 to SW6 Switch SW11, SW12 Switch

Claims (9)

A power supply unit connected to a power source mounted on the vehicle via a power line and supplying power from the power source to another device via the power line, a power source information acquiring unit for acquiring information relating to the power source, and the power source A power supply information transmitting apparatus having a transmitting means for transmitting the information acquired by the information acquiring means superimposed on a power line for supplying power to another apparatus;
The power supply information transmitting apparatus is connected to the power supply information transmission apparatus via a power line, and has a reception means for extracting and receiving information transmitted by the transmission means of the power supply information transmission apparatus from the power line. One or a plurality of electronic devices that operate and operate according to the information received by the receiving means. The transmission means is configured to transmit a signal obtained by amplitude-shift-modulating the information superimposed on a power line,
The power information transmitting device is
Detection means for detecting the number of electronic devices connected via a power line;
Amplitude adjusting means for adjusting the amplitude of the signal superimposed on the power line by the transmitting means and an impedance adjusting means for adjusting the impedance of the power line on which the transmitting means superimposes according to the number of electronic devices detected by the detecting means; The power supply information transmission system according to claim 1, further comprising: One resistor arranged in a transmission path from the transmission means to the electronic device, and one or more other resistors that can be connected / disconnected in parallel to the one resistor,
The power supply information transmission system according to claim 2, wherein the amplitude adjusting unit is configured to connect / disconnect the other resistor according to the number of electronic devices detected by the detecting unit. One coil arranged in the power supply path from the power supply means to the electronic device, and one or more other coils that can be connected / disconnected in parallel to the one coil,
4. The power supply according to claim 2, wherein the impedance adjusting unit is configured to connect / disconnect the other coil according to the number of electronic devices detected by the detecting unit. 5. Information transmission system. A power supply unit connected to a power source mounted on the vehicle via a power line and supplying power from the power source to another device via the power line, a power source information acquiring unit for acquiring information relating to the power source, and the power source A power supply information transmitting apparatus having a transmitting means for wirelessly transmitting information acquired by the information acquiring means;
The power supply information transmitting apparatus is connected to the power supply information apparatus via a power line, and has a receiving means for receiving information transmitted wirelessly by the transmission means of the power supply information transmitting apparatus, and operates with the power supplied from the power supply means. One or a plurality of electronic devices that operate in accordance with information received by the receiving means. 6. The power supply information transmitting device according to claim 1, wherein the power source information transmitting device is mounted on an electric connection box having a terminal portion for connecting a plurality of power lines and branching the power lines. The power supply information transmission system described. The information acquired by the power information acquisition means includes information on the voltage or remaining capacity of a battery mounted on the vehicle, the state of the ignition switch of the vehicle, and / or the state of the accessory switch of the vehicle. The power supply information transmission system according to any one of claims 1 to 6. Connected to the power supply installed in the vehicle via the power line,
Power supply means for supplying power from the power source to another device via a power line;
Power supply information acquisition means for acquiring information related to the power supply;
A power supply information transmission apparatus comprising: transmission means for superimposing and transmitting the information acquired by the power supply information acquisition means on a power line that supplies power to another apparatus. Connected to the power supply installed in the vehicle via the power line,
Power supply means for supplying power from the power source to another device via a power line;
Power supply information acquisition means for acquiring information related to the power supply;
A power supply information transmission apparatus comprising: a transmission means for wirelessly transmitting information acquired by the power supply information acquisition means.

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