The high-speed optocoupler is usually referred to as the photoelectric coupler. It is a point photoelectric conversion device with light as a transmission signal, which belongs to the photoelectric conversion element.

1. Its rationale

The function of photoelectric coupler includes light emission, light reception and signal amplification. The electrical signal input to the coupler will be converted into a certain wavelength of light by the diode. After receiving the light, the detector will produce photocurrent, which will be output after amplification, and complete the conversion.

2. Characteristics of high-speed optocoupler

Because the coupling capacitance between the luminescent tube and the receiver is very small, the effect of the coupling capacitance on the output current is relatively small, which makes the common mode rejection ratio very high. In terms of output, its characteristics are similar to those of crystal triode. At the same time, its isolation characteristics, transmission characteristics are very good. When it is used as a linear coupler, there will be a certain delay time between the input signal and the output signal. Under the different structure of the photoelectric coupler, the delay time has a great difference, which can be selected according to the needs.

3. What are its applications

When it is used as a signal isolation interface element for computer digital communication and real-time monitoring circuit, it can increase the reliability of computer work processing and bring accurate information to the computer. When high-speed optocoupler is used in the process of long line information transmission, as a terminal isolation element, it can greatly improve the signal-to-noise ratio, make the information more accurate transmission, and reduce the influence of midway. It is often seen in various circuits. At present, it has become the most kinds of circuit components, the most widely used.

High - speed optocoupler is mainly used as a component, the specific range of use is very wide.