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Comparison of Active Isolator and Passive Isolator

The active isolator circuit includes a power supply section, an input section, and an output section. After the signal is processed by the input circuit, it becomes a certain digital quantity or electromagnetic wave, and then it is isolated without any parts to realize electrical isolation. The isolated digital quantity or electromagnetic wave is converted into analog quantity through the output circuit. The working power of the active isolator comes from an independent power supply, and the circuit converts the input power into multiple power supplies to provide working energy to the input and output circuits. Active isolators can isolate various input signals, which can be voltage, current, and frequency. The size of the signal can also be freely selected. As long as the signal that the input circuit can handle can be input and isolated.


 NANJING PARROKEN TECHNOLOGY CO., LTDintervalLocerProducts include:active isolatorandPassiveIsolatorMany customers have many questions about the selection of these two products. Now let's make the following explanations.
active isolatorThe circuit includes a power supply portion, an input portion, and an output portion. After the signal is processed by the input circuit, it becomes a certain digital quantity or electromagnetic wave, and then it is isolated without any parts to realize electrical isolation. The isolated digital quantity or electromagnetic wave is converted into analog quantity through the output circuit. The working power of the active isolator comes from an independent power supply, and the circuit converts the input power into multiple power supplies to provide working energy to the input and output circuits. Active isolators can isolate various input signals, which can be voltage, current, and frequency. The size of the signal can also be freely selected. As long as the signal that the input circuit can handle can be input and isolated.
active isolatorThe output circuit can generate a variety of signals, such as (PA-1187) 0-10V, 4-20mA, proportional to the input signal, not necessarily 1:1, in other words, it has a signal conversion function. The active isolator input impedance of the current input is only 50 ohms, and most current supplies can be easily driven. The load capacity of the active isolator with current output is relatively large, and the isolation accuracy is not affected when the load changes.
passive isolatorThe circuit includes an input portion and an output portion. The signal is processed by the input circuit and turned into electromagnetic wave, and then electrically isolated through the isolation element. The isolated electromagnetic wave is converted into analog passive isolator through the output circuit. The circuit working energy comes from the input signal end, so the input signal needs to have sufficient driving capability to drive it to work, and there will be a certain voltage drop (4V). The passive isolator can isolate 0-20ma DC current signal. And the input and output correspond 1:1. The ideal load of a passive isolator is below 300 ohms and can reach 500 ohms. The power consumption of the passive isolator is very low, less than 100 milliwatts, and it is an environmentally friendly and energy-saving product.