Optocoupler is generally composed of three parts: the emission of light, the reception of light and the amplification of signals. The input signal drives the light-emitting diode (LED) to emit a certain wavelength of light, which is received by the optical detector to produce a light current, which is then amplified and then output. This completes the electric-optical-electrical conversion, thus playing the role of input, output, isolation. Because of the isolation between optocoupler input and output, Optocoupler the transmission of electrical signals is unidirectional and so on, it has good electrical insulation capability and anti-interference ability. Because the input of optocoupler is a low resistance element of current type work, it has a strong ability of common-mode inhibition.
The function and working principle of optocoupler
Because of the isolation between optocoupler input and output, Optocoupler the transmission of electrical signals is unidirectional and so on, it has good electrical insulation capability and anti-interference ability. Because the input end of Optocoupler is a low resistance element of current type work
, so it has a strong ability of common-mode inhibition. Therefore, it can greatly improve the signal-to-noise ratio in the long line transmission information as the terminal isolation element. As a signal isolating interface device in computer digital communication and real-time control,
Can greatly increase the reliability of computer work.
The main advantages of optical coupling are: signal one-way transmission, input and output completely realize the electrical isolation and isolation, output signal on the input side has no effect, Optocoupler anti-interference ability, stable work, no contact, long service life, high transmission efficiency.
Optocoupler was developed in the 70 's to produce new devices, has been widely used in electrical insulation, level conversion, cascaded coupling, drive circuit, switching circuit, chopper, multi-harmonic oscillator, signal isolation, class isolation
, pulse amplification circuit, digital instrument, long-distance signal transmission, pulse amplification, Solid State relay (SSR), instrumentation, Optocoupler communication equipment and microcomputer interface. In the Single-chip switching power supply, the linear optocoupler can be used as a optocoupler feedback circuit, by adjusting the control terminal current to change the duty ratio, to achieve precision voltage stabilizing purposes.
The main function of optocoupler is isolation, such as signal isolation or photoelectric isolation. Isolation can play a protective role, such as one side is the microprocessor control circuit, the other side is the high voltage execution end, such as the electric power start of the motor, electric light, etc., you can be separated by Optocoupler. Optocoupler When the coupling of two different models is not only the load current, the light coupling of the large load current can be used instead of the light coupling of the small load current.
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