MAGNETIC FIELD DETECTION DEVICE

PROBLEM TO BE SOLVED: To provide a magnetic field detection device for detecting the magnetic field of 2 terminal Hall IC, which is inexpensive and light load when mounted for out putting the frequency or cycle of current of the electric power source. SOLUTION: One terminal of Hall IC 102 is connected with one terminal of a resistor 101, the other terminal of which is connected with the power source, and the other terminal of the Hall IC 102 is grounded. The Hall IC 102 is composed of a CLK circuit 120, an ON/OFF control circuit 130 and a magnetic field detection circuit 110, wherein the CLK circuit 120 is controlled by the output of the magnetic field detection circuit 110, and the Hall IC 102 is intermittently operated by 2 cycles, thereby the magnetic field is detected as the output of the frequency or the cycle of the power source current of the Hall IC 102. COPYRIGHT: (C)2006,JPO&NCIPI