A new complementary symmetrical structure of using dual magnetic cores for open loop Hall-Effect current sensors

In this paper, a new complementary symmetrical structure of using dual magnetic cores for open loop Hall-Effect current sensors is proposed to reduce the influence of the position change of primary current carrying conductor, which cannot be compensated in signal processing circuit. Magnetic field simulations by using Ansoft Maxwell are made to evaluate the influence from the magnetic fields of the core air gap, as the conductor changes its position inside the core. Both simulation and the testing results show that the influence is obviously reduced by a dual cores structure, and the accuracy of open loop Hall-Effect current sensor is improved to +-0.5%.