| 摘要 |
<p><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</p> |
