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《Electric Engineering》 2018-15
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Circuit Design of Self-powered Current Sensor

CHEN Hao;WU JiANDe;College of Electrical Engineering,Zhejiang University;  
Current transformer(CT)has two working modes:current sensor and power supply transformer.The equivalent circuit of the current transformer in these two working states is analyzed theoretically,and the maximum output power obtained in the power supply mode and the influence of the parallel resonant capacitor on the output power is derived.On the basis of this,a self-powered current sensor circuit is proposed,which can supply power to the current measurement circuit by the current transformer.The circuit adopts a power supply and measurement switching circuit,and realizes smooth switching of the two working modes,so as to realize the function of self-powered detection of cable current.Finally,the circuit is verified by experiments.
【CateGory Index】: TM452
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