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Optocoupler Has Good Electrical Insulation Capability
- Nov 06, 2017 -

Optocoupler (full name: optocoupler) is the main role of isolation, such as signal isolation or photoelectric isolation. Isolation can play a protective role, such as microprocessor control circuit on one side and high voltage on the other side, such as mains starter, electric light, etc., can be isolated with optocoupler. When two different models of optocouplers only load current is different, you can use a large load current optocoupler optocoupler instead of a small load current.

Optocoupler is the development of new devices made in the 1970s, Optocoupler is now widely used in electrical insulation, level conversion, coupling between stages, drive circuit, switching circuit, chopper, multivibrator, signal isolation, interstage isolation, pulse Amplification circuit, digital instrumentation, Optocoupler remote signal transmission, pulse amplification, solid state relay (SSR), instrumentation, communications equipment and computer interface.

The main role of optocoupler is the isolation effect, such as signal isolation or photoelectric isolation. Isolation can play a protective role, such as microprocessor control circuit on one side and high voltage on the other side, such as mains starter, electric light, etc., can be isolated with optocoupler. When two different models of optocouplers only load current is different, you can use a large load current optocoupler optocoupler instead of a small load current.

Optocoupler generally consists of three parts: light emission, light reception and signal amplification. The input electrical signal drives the light-emitting diode (LED) to emit a certain wavelength of light, which is received by the photodetector to generate photocurrent, which is further amplified and output. Optocoupler This completes the electric - light - electricity conversion, which play a role in input, output, isolation. As the optocoupler input and output isolation between each other, the signal transmission has the characteristics of one-way, Optocoupler which has good electrical insulation and anti-interference ability. Since the input end of the photocoupler belongs to the low resistance element of current type work, it has strong common mode rejection ability.

Optocoupler is based on light as a medium to transmit electrical signals of a light-to-electricity conversion device. It consists of light source and receiver two parts. The light source and the light receiver are assembled in the same sealed shell and separated from each other by a transparent insulator. Optocoupler The pin of the light source is the input end and the pin of the light receiver is the output end. The common light source is a light emitting diode, the light receiver is a photodiode, and the phototransistor

Its working principle: the optocoupler input power signal to the light-emitting light source, the intensity of light depends on the size of the excitation current, the light shines on the receiver together after the package, due to photoelectric effect and have a photocurrent, Led by the output of the receiver, Optocoupler so that you can achieve a light electric conversion.


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