Analog signal isolator

1, in the whole process of industrial production to complete the monitoring and operation must use a variety of instruments, automatic control systems and electric actuators, the signal transmission in the middle of them not only has a very weak to millivolt level, microampere level of small signals, but also tens of volts, even thousands of volts, hundreds of amps of large signals; There are not only low-frequency direct current signals, but also high frequency pulse signals. After composing the system software, it is usually found that the signal transmission between the instrument panel and the machine equipment interferes with each other, resulting in instability of the system software and even operation errors. In addition to the characteristics of each instrument panel and machine equipment, such as anti-electromagnetic interference hazards, there is a very key element is that there is a potential difference in the middle of the signal positioning point between the instrument panel and the machine equipment, so the "grounding device loop" leads to the loss of frames in the whole process of signal transmission. Therefore, in order to ensure smooth and reliable operation, the "grounding device loop" problem is a problem that must be dealt with in the signal processing mode of system software. Analog signal isolator.

2, of course interference: lightning is a key source of natural interference, lightning caused by interference can be transmitted to thousands of kilometers away. The frequency domain mode of lightning interference is a large pulse accumulated on a series of arbitrary pulse cases. Cosmic noise is caused by electromagnetic radiation, which changes continuously throughout the day. Solar noise is accompanied by strong changes in solar activity. Natural noise is critical to communication interference, and lightning energy spike pulse can cause damage to many machines and equipment, should be prevented or reduced in many ways to reduce the level of damage, reduce losses.

3, human factor interference: the direct cause of electromagnetic interference is the change of working voltage or current in the electrical conductor, that is, the larger dv/dt or di/dt.dv/dt or di/dt can make the electrical conductor cause ionizing radiation. On the one hand, you can use this property to accomplish special functions, such as endless communication, radar detection, or other functions; On the other hand, when electronic products are working, because the dv/dt or di/dt in the electrical conductor will cause electromagnetic radiation, no matter what the subjective purpose is, the objective induction of the electromagnetic environment leads to environmental pollution. There are also processing companies in the processing process will often have some large and medium-sized machinery and equipment (motor, soft starter) often power switch, they will also lead to some soluble, rational interference, will also harm the instrument equipment all normal display information or collection. Where there is a sudden change in current and voltage, there is no doubt that electromagnetic interference will occur. Data pulse power circuit is a typical source of interference, with the widespread use of electronic information technology, electromagnetic radiation will become more and more serious, only the application of simulation signal isolators to deal with this interference problem.