Circuit for improving optocoupler response speed based on image current source
A technology of mirror current source and response speed, which is applied in the electronic field, can solve the problems of unguaranteed switching amplitude, high low-level amplitude, and reduction, so as to overcome optical attenuation, reduce circuit power consumption, and overcome large discrete Effect
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[0020] Isolated RS485 is widely used in the smart energy meter industry for communication. The Chinese power industry standard DL / T645 stipulates that the maximum communication rate is 19200 baud. Connect the circuit of the present invention to the communication line of the smart energy meter, such as image 3 As shown, the circuit for data transmission and reception is the same, Din and Dout are connected to the MCU data line, Ro and Di are connected to the RS485 chip, VCC1=VCC2=5V, after parameter adjustment, the measured delay parameter is the maximum 6uS, which can support 38400 waves Baud rate isolated RS485 communication fully meets the needs of use.
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