Design of intrinsically safe circuit with adjustable cut-off current and protection time

In order to solve the shortcomings of low protection accuracy,low efficiency and poor parameter setting flexibility of traditional current - limited and current - intercepted intrinsically safe protection circuits, on the basis of analyzing the intrinsically safe protection circuit mode,a self -recovery intrinsically safe protection circuit based on current detection chip, voltage comparator and monostable delay circuit was designed. The performance of the new current-intercepted intrinsically safe circuit and the traditional current - limited protection circuit was compared and tested. The results show that the designed intrinsically safe circuit has the advantages of fast response,high efficiency and small internal resistance.