| With the rapid development of distributed photovoltaic power generation,electric vehicles,DC transmission,DC distribution network and other technologies,the measurement of DC current is becoming more and more important,and the measuring instruments are constantly being updated.DC current measurement technology has gradually developed from direct measurement to indirect measurement.In order to meet the needs of indirect measurement of DC current,the paper studies the intelligent current sensing technology.First,two common non-contact current measurement technologies of magnetic modulation current sensor and Hall current sensor are analyzed,and the measurement principle and performance of the two are analyzed and compared.Based on this,the constant current source circuit,amplifier circuit,zeroing circuit and other units of the Hall current sensor are designed and simulated,and several main factors affecting its accurate measurement are analyzed.Secondly,the effect of temperature on the Hall current sensor is mainly studied,and a Hall current sensor temperature compensation method based on a combination of software compensation and constant current source compensation is designed.Circuits such as a microcontroller,constant current source,digital temperature sensor,and multiplier are applied Optimized for traditional software compensation.Experimental tests show that the compensation effect is significantly improved compared to the traditional constant current source compensation,and the temperature compensation effect is improved by about 13.7% compared to the traditional compensation method.Finally,a smart Hall current sensor is designed.The selection of Hall sensor magnetic material and Hall element selection were analyzed,and the microcontroller control circuit and Lo Ra wireless communication module were designed.The communication and networking between the intelligent Hall current sensor and the monitoring host has already been realized. |
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