Signal isolation method
A group isolation and voltage signal technology, which is applied in the field of electrical signal transmission of industrial automation instruments, can solve problems such as unstable signal output and hidden dangers of industrial control, and achieve the effect of overcoming interference
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[0017] The invention adopts electromagnetic isolation method to send 24V power supply to the push-pull circuit. The push-pull circuit passes through the differential amplifier unit composed of two SC1008 triodes inside to make the circuit oscillate, and generates two sets of isolated voltage signals through the magnetic ring coil. It is ±15V, +24V. ±15V is the power supply for the front-stage 741 operational amplifier, and +24V is the power supply for the back-stage 741 operational amplifier. The front-stage operational amplifier and the latter-stage operational amplifier are isolated by a magnetic loop coil. The 4-20mA current signal transmitted by the actuator is sent to the front-stage operational amplifier through the sampling resistor to generate a voltage signal, and then the signal is transmitted to the isolation coil after amplification. The isolation coil can adjust the negative feedback and linearity of the front-stage operational amplifier so that the...
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