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485 communication circuit based on magnetic isolation technology

A magnetic isolation and communication circuit technology, applied in the direction of logic circuit connection/interface layout, line transmission components, etc., can solve the problems of communication rate influence, space occupation, system complexity, etc.

Inactive Publication Date: 2021-01-15
QINGDAO TOPSCOMM COMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the optocoupler solution requires an independent optocoupler for each signal, and the two networks of the master end and the slave end need to be powered separately, which requires an additional isolated power supply, and the entire system is complex and takes up space.
This solution also has the problem of seriously affecting the communication rate as the optocoupler device ages

Method used

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  • 485 communication circuit based on magnetic isolation technology
  • 485 communication circuit based on magnetic isolation technology

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Embodiment Construction

[0013] Such as figure 2 As shown, the main-side magnetic isolation drive chip starts to work after the power supply module obtains electric energy, and provides drive signals of three frequencies, f1, f2, and f3, for the magnetic isolation transformer through the internal drive circuit. The frequencies f1 and f2 respectively represent sending binary bits 1 and 0 to the magnetically isolated 485 chip at the slave end. The frequency f3 is used to provide a data return carrier for the secondary isolation 485 chip, and the primary-side magnetic isolation drive chip demodulates the data returned from the secondary-side magnetic isolation 485 chip from the frequency f3 through the internal demodulation module.

[0014] The magnetic isolation transformer realizes the isolation of the primary side and the secondary side through two windings without electrical connection. The transfer of electric energy and the transmission of signals are realized through electromagnetic induction be...

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Abstract

The invention discloses an isolation power supply 485 communication circuit based on a magnetic isolation technology. The circuit comprises a main end magnetic isolation driving chip, a magnetic isolation transformer, a slave end magnetic isolation 485 chip and a peripheral circuit thereof. According to the circuit, three signals with different frequencies pass through the magnetic isolation transformer to realize the integration of power supply and bidirectional data transmission, and the inconvenience that the traditional optocoupler isolation 485 communication circuit needs to isolate a power supply is eliminated. By utilizing the isolation characteristic and the energy transmission and information transmission characteristic of the magnetic isolation transformer, the design complexityof the original isolation communication circuit is simplified while the equipment and power utilization safety is ensured.

Description

technical field [0001] The invention relates to a 485 communication circuit based on magnetic isolation technology. It is mainly applicable to application scenarios involving isolated communication. Background technique [0002] The RS485 serial bus standard adopts balanced transmission and differential reception, and has a strong ability to suppress common-mode interference. It is widely used in many fields such as industrial control, instruments, meters, multimedia networks, and mechatronics products. In the application, two communication networks are often involved, one side is connected to the weak current control circuit, and the other side is connected to the strong current equipment. There is high voltage on the strong power side. In order to ensure the stability of the equipment and the safety of power consumption, electrical isolation is required between the two communication networks. [0003] The current mainstream method is to isolate the 485 communication chip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175H04B3/02
CPCH03K19/0175H04B3/02
Inventor 刁瑞朋刘祥波孙广鑫
Owner QINGDAO TOPSCOMM COMM