Off-chip high-voltage isolation circuit applied in fast charging interface

Abstract

The present disclosure provides an off-chip high-voltage isolation circuit applied to a fast charging interface, including: a first voltage signal output circuit, a second voltage signal output circuit, a shutdown circuit of the second voltage signal output circuit, and a charge absorption circuit ; Wherein, the first voltage signal output circuit includes: a first transistor M1, the second voltage signal output circuit includes: a second transistor M2, a third transistor M3 and a resistor R1, the second voltage signal output circuit The shutdown circuit includes: a fourth transistor M4, and the charge absorbing circuit includes: a fifth transistor M5. The present invention can effectively avoid damage to core circuit devices inside the chip caused by a short circuit caused by damaged charging lines.

Description

technical field [0001] The present disclosure relates to the field of integrated circuit design, in particular to an off-chip high-voltage isolation circuit applied in a fast charging interface. Background technique [0002] With the development of information technologies such as integrated circuits, communications, and artificial intelligence, smart terminals such as mobile phones and tablet computers are playing an increasingly important role in people's production and life. However, the capacity of lithium-ion batteries that provide power for smart terminals has not improved significantly in the past for a long time. In order to obtain longer use time, people have to increase the battery volume to obtain longer battery life, which runs counter to the miniaturization of equipment. The emergence and development of fast charging technology has greatly alleviated this contradiction. By increasing the charging voltage and charging current, the battery can be fully charged in ...

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Problems solved by technology

[0003] However, in the prior art, there are still some safety defects inside the charging line of the fast charging device. The charging line contains signal lines and power lines, which are easily damaged parts in the fast charging system. Factors such as high-voltage power lines and signal lines that cannot withstand high voltage short-circuit and burn the charging end or power receiving end, resulting in damage to the communication circuit and related components of the charging end or power receiving end

[0004] Therefore, in the process of realizing the concept of the present disclosure, the inventors found that there are at least the following problems in the related art: when the charging line is damaged and short-circuited, it is easy to cause damage to the core circuit components inside the fast charging interface chip, reducing the service life of the fast charging device

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