Current detector having a Hall-effect device

摘要

A current detector comprising a Hall-effect device (1) for generating a voltage proportional to magnetic field strength, a first and a second current path terminal (3, 4) for the flow of a current (Is) to be detected or measured, first conductor means such as a wire (12) connected between the first and the second current path terminal for providing a first current path therebetween, and second conductor means having two wires (13, 14) and a conductor layer (15) serially connected between the first and the second current path terminal for providing a second current path therebetween. The first and the second conductor means have resistances (R1, R2) such that the current (Is) on the first current path terminal is divided at a predetermined ratio into two fractions (Is1, Is2) on flowing into the first and the second conductor means. The conductor layer (15) is so arranged in relation to the Hall-effect device (1) as to cause the same to generate an output voltage proportional to the magnitude of the second current fraction (Is2) flowing through the conductor layer, and hence to the magnitude of the current (Is) on the first current path terminal.