Optocoupler is used to isolate the input and output signals, and the 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. Optocoupler This completes the electric-optical-electrical conversion, thus playing the role of input, output, isolation. Because of the isolation between optocoupler input and output, 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, Optocoupler it has a strong ability of common-mode inhibition.
The characteristics of Optocoupler
Because of its unique structural characteristics, Optocoupler has the following obvious advantages in the actual use process:
(1) can effectively restrain the noise of the grounding circuit, Optocoupler eliminate the interference, so that the signal field and the main control end in the electrical completely isolated, Optocoupler to avoid the main control system was accidentally damaged.
(2) The electric signal can be transmitted between different potentials and different impedance, and the function of amplifying and shaping the signals is greatly simplified.
(3) Fast switching speed, high speed optocoupler response speed to the NS order of magnitude, Optocoupler greatly expanding the application of optical coupling in digital signal processing.
(4) Small size, the device uses two-row direct-insert package, with a single channel, double channels and up to eight channels and other structures, the use of very convenient.
(5) can be replaced by transformer isolation, will not be caused by the contact beating of the peak noise, and vibration and impact resistance is strong.
(6) The high linearity optocoupler is used in the medical equipment, Optocoupler besides the power monitoring, and can effectively protect the patient's life safety.
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