Optocoupler Integrated circuit
Optocoupler is a combination of an infrared LED with a phototransistor is wrapped into a single chip. Infrared light is included in the electromagnetic waves that are not visible to the unaided eye. This light is not visible to the eye because it has a wavelength of light rays that are too long for the human eye response. Infrared rays have a frequency range of 1 x 1012 Hz up to 1 x 1014 GHz with a frequency or wavelength region 1?m – 1mm.
Infrared LED is an electronic component that emits infrared light with very small power consumption. If given the prasikap advanced infra-red LED contained in optocoupler will issue approximately 0.9 micrometers wavelength.
The process of emission of light in the infrared LED in the optocoupler is as follows. We deliver current diode, electrons loose from its bonds because it requires power from the power supply. Once the electrons loose, many electrons that join with the existing holes around it (into the other holes are empty). At the time of admission to another hole, the electrons release energy will be radiated in the form of light, so that the diode will light up or emit light when current was passed. Infrared light contained in the optocoupler does not need the lens to focus light onto a single chip because it has close proximity to the recipients. In an optocoupler which served as the recipient of the infrared light is a phototransistor. Phototransistor is an electronic component that functions as an infrared light detector. Light detector is changing effects of light into electrical signals, and therefore included in the class phototransistor optical detector.
Phototransistor has a collector-base connection with a large infrared light, because light can generate electron-hole pairs. With the given prasikap forward, the light coming in will cause the current in the collector.
this is the schematic diagram of optocoupler :
optocoupler schematic diagram
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