Straight-through high-voltage data transmission interface circuit

Abstract

The invention discloses a straight-through high-voltage data transmission interface circuit and belongs to the field of high / low-voltage compatible analog integrated circuit design. The circuit comprises a high-voltage data reading circuit and a high-voltage data writing circuit. The high-voltage data reading circuit includes a first high-voltage current bias generation circuit, a driving circuit and a switch selection circuit, wherein the first high-voltage current bias generation circuit is connected with the driving circuit through the switch selection circuit and used for generating high-voltage bias current, and the driving circuit controls on / off of the high-voltage bias current through switching-on of the switch selection circuit. The high-voltage data writing circuit comprises a second high-voltage current bias generation circuit and a logic circuit, wherein the high-voltage current bias generation circuit judges the existence of current through the logic circuit and generates a corresponding logic signal. The problem of transmission of digital signals in several-hundred-volt high-voltage environments is solved, and the transmission reliability is enhanced.

Description

technical field [0001] The invention belongs to the design field of high and low voltage compatible analog integrated circuits, in particular to a straight-through high-voltage data transmission interface circuit. Background technique [0002] With the application of lithium battery packs in the field of electric vehicles, single lithium batteries are often stacked to achieve high-power output, and the output voltage often reaches several hundred volts, while the chip for controlling and testing the battery is often only used in a 40V environment , so the control and detection chips also need to be stacked, and the data transmission between chips becomes a problem. [0003] Data transmission in the high-voltage field is an important part of the high-voltage lithium battery pack management system. This is because the functions of the battery management chip are more complicated now, and the simple analog circuit can no longer meet the control requirements, so large-scale digi...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a straight-through high-voltage data transmission interface circuit, which solves the technical problem of low data transmission efficiency and high cost caused by the addition of off-chip independent devices for data transmission between chips in the prior art

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