Wireless transmission function with current sensor terminal, wireless transmission method and radio transmitting and receiving system

摘要

PROBLEM TO BE SOLVED: To provide a current sensor terminal with a wireless transmission function, the terminal enabled to wirelessly transmit information of measured amperage and power consumption even in the case of using an autonomous power source.;SOLUTION: A current sensor terminal includes: a power storage circuit for storing power by rectifying an electromagnetic induction current from a current sensor detecting an electromagnetic induction current based on a current flowing on a power line; and a transmission circuit for wirelessly transmitting a given transmission signal that does not directly include data related to an amperage of the current flowing on the power line, the current detected by the current sensor. The terminal performs: determining whether a power storage voltage of the power storage circuit exceeds a predetermined threshold voltage; turning on a switch circuit just for a given period of time that is longer than time for the transmission circuit to complete wireless transmission of a transmission signal since when the power storage voltage of the power storage circuit exceeds the predetermined threshold voltage, to supply the transmission circuit with the power storage voltage as a power supply voltage; and changing a transmission interval of the transmission signal in accordance with the amperage of the current flowing on the power line, the current detected by the current sensor, to cause a reception side to convert the transmission interval into an amperage.;COPYRIGHT: (C)2014,JPO&INPIT