The principle of isolation is to eliminate the root cause of an error so that it never occurs.
Isolation reasons and methods:
There are two main reasons for isolation:
On the one hand, to protect people, and on the other hand, to protect things. Low-voltage electronic circuits, the protection of things to be referred to, the protection of more responsible devices such as FPGAs, processors, etc., on the other hand, to protect the key devices, to avoid interference with the chip is not working properly or the results are not desired.
There are three main ways of isolation:
Opto-coupler isolation (optical), magnetic isolation (magnetic), capacitive isolation (electrical). Capacitive isolation is used more in TI's products, and ADI mainly uses magnetic isolation.
Principle of capacitive isolation:
Capacitive isolation uses logic input and output buffers separated by a double capacitance SiO2 insulated gate.
Capacitive isolation applications:
1, industrial automation:
Capacitive isolation is widely used in industrial automation, such as sensor signal isolation, analog signal isolation, digital signal isolation. Capacitive isolation ensures electrical isolation between devices, prevents interference and electrical obstacles, thus improving the reliability and safety of the system.
2, medical equipment:
Capacitive isolation also has a wide range of applications in medical equipment, such as electrocardiographs, blood pressure monitors, blood glucose meters and so on. Capacitive isolation can ensure electrical isolation between medical equipment and patients, avoiding the generation of electrical interference and electrical injury, thus improving the safety and health of patients.
3, communication equipment:
Capacitive isolation also has a wide range of applications in communication equipment, such as telephone line isolators, fiber optic isolators, USB isolators and so on. Capacitive isolation can ensure electrical isolation between communication equipment to avoid interference and electrical obstacles, thus improving the reliability and stability of communication equipment.
4, power system:
Capacitive isolation also has a wide range of applications in the power system, such as transformer isolators, power supply isolators, protection device isolators and so on. Capacitive isolation can ensure electrical isolation between power systems to avoid electrical interference and electrical damage, thus improving the reliability and security of the power system.