Signal isolator function and working principle - Database & Sql Blog Articles

Photocoupler

What is the working principle and function of the signal isolator?
working principle:
Firstly, the signal of the transmitter or the meter is modulated and transformed by the semiconductor device, and then isolated and converted by the optical or magnetic sensing device, and then demodulated and converted back to the original signal before isolation, and the power supply of the isolated signal is isolated. . Ensure that the transformed signal, power supply, and ground are absolutely independent.
Features:
One: Protect the control loop of the lower level.
Second: weaken the impact of environmental noise on the test circuit.
Third: Suppress public grounding, frequency converter, solenoid valve and unknown pulse to the equipment; at the same time, the function of limiting voltage and frontal flow to the lower level equipment is the input, output and communication of the transmitter, instrument, frequency converter and solenoid valve plc/dcs. Faithful protection of the interface. DIN series rail structure, easy to install, can effectively isolate: input, output and potential between the power supply and the earth. It can overcome the inverter noise and various high and low frequency ripple interference.