Wireless passive current temperature sensor

Abstract

The invention discloses a wireless passive type current temperature sensor. According to the technical scheme, the sensor is characterized by comprising a double-winding current transformer, an electric energy taking module and a working module. The working module comprises a current sensing module; the double-winding current transformer comprises two secondary side windings; the electric energy taking module and the current sensing module are respectively connected with the two secondary side windings. The sensor comprises an intelligent distribution module and an electric energy storage module. The intelligent distribution module has two distribution modes; the distribution modes comprise a first distribution mode of taking the electric energy taking module as a power supply to provide power for the working module and a second distribution mode using the electric energy taking module and the electric energy storage module jointly as a power supply to provide power for the working module e. The electric energy taking module can charge the electric energy storage module in the first distribution mode. The sensor has the advantages of being free of maintenance and capable of monitoring the temperature of a measured line in real time.

Description

technical field [0001] The present invention relates to a sensor, more specifically it relates to a wireless passive current temperature sensor. Background technique [0002] At present, the Chinese patent with the notification number CN109270337A discloses a passive wireless current sensor based on a double-winding current transformer, which includes a double-winding current transformer, a mutual inductance energy harvesting module, an energy storage module, a current sensing module, and a signal processing Module, wireless transmission module, double-winding current transformer includes a primary side winding connected to the line under test and two secondary side windings, and the two secondary side windings are respectively connected to the mutual inductance energy-taking module and the current sensing module; the current The sensing module is connected with the signal processing module and the wireless transmitting module in turn. The current sensing module converts the...

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Problems solved by technology

[0003] The passive wireless current sensor based on a double-winding current transformer stores the electric energy obtained in the energy storage module through the mutual inductance energy harvesting module during use, so that the lithium battery and the supercapacitor in the energy storage module can make the module It is kept at the maximum power during operation, but because the energy storage module is constantly charging and discharging, the maximum power of the module is reduced during operation. After a certain time limit, the battery needs to be replaced, but the sensor cannot detect the measured The current size of the line, and only the current of the line under test is monitored in the sensor, and the temperature of the line under test is lacking, which makes the work of temperature measurement cumbersome and difficult to troubleshoot, and does not conform to the intelligence of the low-voltage distribution network

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