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Circuit for realizing polarity turnover of non-polar RS485

A RS485, polarity reversal technology, applied in logic circuits, logic circuit coupling/interface using field effect transistors, logic circuit connection/interface layout, etc. The effect of improving flip threshold consistency, improving yield, and wide application range

Active Publication Date: 2018-12-11
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polarity switching of existing circuits is realized by exchanging the interface input signals with MOS switches. The on-resistance of MOS switches and the process differences between MOS switches make the consistency of the polarity (data) threshold voltage of the circuit inconsistent. well, resulting in a significant drop in the yield of the circuit

Method used

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  • Circuit for realizing polarity turnover of non-polar RS485
  • Circuit for realizing polarity turnover of non-polar RS485
  • Circuit for realizing polarity turnover of non-polar RS485

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Embodiment Construction

[0015] In order to describe the technical content of the present invention more clearly, further description will be given below in conjunction with specific embodiments.

[0016] In a specific embodiment, the polarity-free RS485 implements a polarity reversal circuit, which is characterized in that the circuit includes an A / B comparison module, an oscillator, a timer, an NOR gate and an RS485 interface circuit. The RS485 interface circuit described above includes an A terminal and a B terminal, the first terminal of the A / B comparison module is connected to the A terminal, and the second terminal of the A / B comparison module is connected to the B terminal. terminal, the output terminal of the A / B comparison module is connected with the first input terminal of the NOR gate, and the output terminal of the oscillator is connected with the first input terminal of the timer. connected, the output end of the timer is connected with the second input end of the NOR gate, and the outp...

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Abstract

The invention relates to a circuit for realizing polarity turnover of a non-polar RS485. The circuit comprises an A / B comparison module, an oscillator, a timer, an XNOR Gate and an RS485 interface circuit, wherein the A / B comparison module comprises a first PMOS tube, a second PMOS tube, a third PMOS tube, a first resistor, a second resistor, a first triode, a second triode and a comparator. The circuit realizes polarity switching by adopting a novel logic structure which replaces MOS switches, and four MOS switches in a traditional scheme are removed, the output signals OUT2 of the A / B comparison module and interrupt signal en generated by the timer are subjected to XNOR processing to realize polarity switching. Therefore, the influence of an MOS switch can be eliminated, and the polarity(data) turnover threshold consistency of different circuits and the consistency of parameters before and after the polarity turnover of a single circuit can be improved. The yield of the circuit is improved, and the method has a wide application range.

Description

technical field [0001] The present invention relates to the technical field of power electronics, in particular to the technical field of RS485 interface, and specifically refers to a non-polarity RS485 realizing polarity reversal circuit. Background technique [0002] With the development of electronic technology, RS485 interface circuits are used in many communication processes, such as RS485 communication, industrial control network, level conversion, power inverter, intelligent building network, meter network, etc. However, the RS485 interface circuit requires one-to-one correspondence between the ports (A to A, B to B) during installation and use. If the connection is wrong, it will cause abnormal communication, so it must be very careful in application. The non-polar RS485 has self-adaptive function, and it can communicate normally even if the port is reversed during use, so it is more convenient in application. [0003] The RS485 interface circuit is an important dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0185
CPCH03K19/018507H03K19/0185
Inventor 冯海波沈天平吴君磊罗先才
Owner CRM ICBG (WUXI) CO LTD
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