High-voltage differential signal bidirectional conversion circuit

CN115733483BActive Publication Date: 2026-06-23黄维权
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
黄维权
Filing Date
2022-12-02
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In electronic products, IIC communication between the main controller and external devices cannot transmit data normally due to voltage mismatch. Existing level conversion chip solutions are difficult to meet design requirements due to the impact of the trade war.

Method used

Design a high-voltage differential signal bidirectional conversion circuit, which uses the conduction and cutoff of NPN and PNP transistors to control voltage conversion, and combines a trigger pull-up unit to improve driving capability, so as to realize single-wire bidirectional data transmission between the main controller and external devices.

Benefits of technology

It enables reliable communication between the low-voltage main controller and the high-voltage external device, simplifies the circuit structure, reduces manufacturing costs, and avoids the constraints of the trade war on production.

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Abstract

The application relates to a high-voltage-difference signal bidirectional conversion circuit, which comprises a first data interface for outputting a first data signal, a second data interface for outputting a second data signal, a first voltage output unit connected to the second data interface and used for outputting a first preset voltage signal, the voltages of the first data signal and the first preset voltage signal being adapted to an external device, a second voltage output unit connected to the first data interface and used for outputting a second preset voltage signal, the voltages of the second data signal and the second preset voltage signal being adapted to a main controller, a first one-way switch unit used for controlling the first voltage output unit to be short-circuited to the second data interface based on a low-level first data signal, and a second one-way switch unit used for controlling the second voltage output unit to be short-circuited to the second data interface based on a low-level second data signal. The application can realize reliable communication of a single-wire bidirectional transmission data line between a main controller and an external device under IIC communication.
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