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

Inactive Publication Date: 2017-04-05
BEIJING BONA ELECTRIC CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

However, the reduction of switching amplitude caused by optical attenuation cannot be guaranteed in th...
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Abstract

The present invention discloses a circuit for improving an optocoupler response speed based on an image current source. The circuit comprises an optocoupler triode, an input end circuit and an output end circuit which are connected with the optocoupler triode and an image current source taken as a load and formed by two image connection triodes, wherein the image current source is connected with the output end of the optocoupler triode, and the output end of the image current source outputs switch signals. The improved circuit obviously shortens the time-delay time of the optocoupler, reduces the current of the front and back ends of the optocoupler, overcomes the problems of the big discreteness of optocoupler CTR parameters and the optical attenuation, is high in transmission efficiency, good in universality and flexible in usage and is especially suitable for the data transmission in the intelligent ammeter industry.

Application Domain

Electric digital data processingLogic circuit interface arrangements

Technology Topic

Time delaysData transmission +9

Image

  • Circuit for improving optocoupler response speed based on image current source
  • Circuit for improving optocoupler response speed based on image current source
  • Circuit for improving optocoupler response speed based on image current source

Examples

  • Experimental program(1)

Example Embodiment

[0019] Example one
[0020] Isolated RS485 is widely used for communication in the smart energy meter industry. The Chinese power industry standard DL/T645 stipulates that the maximum communication rate is 19200 baud rate. 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 sending and receiving 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 up to 6uS, which can support 38400 waves The special rate isolated RS485 communication fully meets the needs of use.

PUM

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Description & Claims & Application Information

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