A loop-powered isolator is a type of isolator for converters that does not require an external power supply, and it provides isolation between its input and output.
The input and output signals for loop-powered isolators are limited to two types: “DC 4–20 mA” and “DC 1–5 V.”
This limitation is due to the mechanism of the loop-powered isolator.
Normally, isolators receive the voltage needed for internal operation from an external power source.
However, loop-powered isolators have a circuit structure that minimizes power consumption, enabling them to draw power from the input signal itself.
In other words, they obtain power from the “4 mA and above” in the “DC 4–20 mA” signal, or from the “1 V” in the “DC 1–5 V” signal.
Since no external power supply is needed for the device, this helps reduce both cost and energy consumption.
Loop-Powered Isolator
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