A Frequency Characteristics Modelling Method for Current Sensors Based on the Electromagnetic Induction Principle

Along with the development of metallurgy, electric power, military industry, etc., the sensors for high-frequency current signals are required to have better frequency characteristics, achieving the precise measuring and controlling. However, there exists no method to accurately calculate a sensor’s frequency characteristics at the designing stage, which creates a huge obstacle to manufacturing sensors. To address the issue, a frequency characteristics modelling method based on the electrical parameters is proposed in this paper and it consists of three phases: developing the relationship within a micro-unit, modelling with the recursive calculation and calculating the transfer function. With this method, the common-used simulation based on the software is transformed into a totally mathematical recursive calculation, which is quite different from the model based on the circuit topology and could avoids the overwhelming modelling workload. Moreover, an application is conducted to indicate the method’s superiority and validity.