| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect both direct and alternating current values by constituting the detector in such a way that the detector detects the value of a current flowing along a current route based on the magnetic permeability of a core. SOLUTION: Commercial power supply lines 7 are led to a load device 3 through a line filter 2 provided with a pair of coils. One line 71 (current route) of the lines 7 is led to the device 3 through a core 5. An oscillation circuit 1 is constituted by connecting a detection coil L1 to a signal route through which positive feedback for oscillation is given so that, when the inductance of the coil L1 changes, the amount of the positive feedback may change. A block 9 to which the output 6 of the oscillation circuit 1 is led is a circuit for detecting the intensity of oscillation of the circuit 1 and sends out detection outputs 8. When the magnetic permeability of the core 5 decreases, the block 9 sends out the outputs 8 in such a way that the inductance of the detection coil L1 is reduced proportionally to the decreasing rate of the magnetic permeability.</p> |
