| 摘要 |
PURPOSE:to obtain an isolator of simple constitution high in response speed by providing a Hall element between the gap of a yoke of the first coil winding to which analog signals are supplied, amplifying the output and feeding back to the second coil of the yoke. CONSTITUTION:Analog signals are supplied to terminals 3, 4 of a primary coil 1 wound on a yoke 2, and a hall element 6 is placed between the gap 6 of the yoke 2. The element 6 generates voltages corresponding to intensity of magnetic field of the gap 7. The output voltage is amplified by a high gain amplifier 8, and amplified output is fed back to a secondary coil wound on the yoke 2 through a resistance 9. The voltage between both ends N, M of the resistance 9 is amplified by a low gain amplifier 10 and outputted to a terminal 11. The current that flows in the coil 5 flows in the direction which generated magnetic flux cancels magnetic flux generated by the coil 1. The two magnetic fluxes balances automatically, the the current in the coil 5 is proportionate to the current of the coil 1. Signals from the terminal 11 are outputted at a high speed and at a high response speed. |
