Introduction and functions of optical coupler

The optical coupler (optical coupler) is called an interface circuit of the optical coupler. It encapsulates the Light-emitting and photosensitive elements in the same housing,A Semiconductor Optoelectronic device that transmits electrical signals through electrical → optical → electrical conversion in the middle.

The optical coupler can be combined by different types of light-emitting components and photosensitive components into many series of optical coupler according to different requirements. The most widely used photocoupler is the combination of Light Emitting Diode and phototransistor.

The optical coupling uses optical signals as the media to realize electrical signal coupling and transmission. The input and output are completely isolated from each other and have strong anti-interference performance. For industrial application measurement and control systems that include both the Weak Current Control and the strong current control, the optical coupling isolation can effectively achieve the isolation of Weak Current and strong current, so as to achieve the purpose of anti-interference. However, the following issues need to be considered when the optical coupling is used to isolate analog data transmitted: ① The Nonlinear Problem of the optical coupling must be considered; ② when the optical coupling is used to isolate the digital amount transmitted, the response speed of the optical coupling should be considered; ③ if the output has power requirements, the Power Interface Design of the optical coupling should be considered.

Learning notes: the main function of optical coupling is isolation, such as signal isolation or photoelectric isolation. Isolation can play a protective role, for example, one side is a microprocessor control circuit, the other side is a high-voltage execution end, such as a municipal Electric start motor, electric lights, etc., you can use photocoupler isolation. When two different models of photocoupler only have different load current, you can replace the photocoupler of small load current with the large load current.

Introduction and functions of optical coupler