Working principle of isolated signal isolation safety barrier
Compared with the Zener safety barrier, the isolated safety barrier not only has the function of limiting voltage and current, but also has the function of galvanic isolation. The isolation barrier is usually composed of three parts: loop energy limiting unit, current isolation unit and signal processing unit. The basic functional circuit is shown in Figure 2. The loop energy limiting unit is the core part of the safety barrier. In addition, there is a loop power supply circuit for driving field instruments and a detection circuit for instrument signal acquisition. The signal processing unit performs signal processing according to the functional requirements of the safety barrier
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