source:Industry News Popular:adapter release time:2022-04-16 09:26:55 Article author:yu
The main function of the optocoupler in the circuit is to realize photoelectric conversion, realize isolation, and avoid mutual interference between input and output. In the design process of different switching power supplies, the role of optocouplers is also different. Combined with TL431, it is the best way to reduce control costs in the switching power supply industry.
1. Basic parameters of optocoupler
The internal structure of the optocoupler consists of three basic parts: light-emitting diodes, light-transmitting insulating layers, and phototransistors. The light-emitting diode emits light, penetrates the insulating layer to the photoelectric conversion transistor, and realizes the current transmission and isolation characteristics.
Second, the application of optocoupler in switching power supply
Features of optocoupler: It has one-way signal transmission, so as to achieve electrical isolation between the input end and the output end, that is, the output signal has no effect on the input end, and has the advantages of strong anti-interference ability, stable working characteristics, high reliability and high transmission efficiency. , which are usually used in switching power supply control loops.
The typical application principle of optocoupler in switching power supply: sampling from the output end, obtaining the error signal, and then transmitting the signal to the PWM controller of the input end IC through conversion and isolation, and by adjusting the PWM duty cycle, it can achieve high precision and stability. pressure output.
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