Short-circuit protection circuit for driving tubes and inductor in switch-type charge management chip

Abstract

The invention discloses a short-circuit protection circuit for driving tubes and an inductor in a switch-type charge management chip, which mainly solves the problem of incorrect detection of an existing short-circuit protection circuit. The short-circuit protection circuit comprises two high-voltage NMOS (N-channel Metal Oxide Semiconductor) tubes, a lower tube detection unit (1), an upper tube detection unit (2) and a logic drive unit (3), wherein the lower tube detection unit (1) is used for carrying out short-circuit detection on a lower driving tube when an upper driving tube is switched on and outputting a lower tube short-circuit signal to the logic drive unit (3); the upper tube detection unit (2) is used for carrying out the short-circuit detection on the upper driving tube and the inductor when the lower driving tube is switched on and outputting an upper tube short-circuit signal to the logic drive unit (3); the logic driving unit (3) controls the upper driving tube and the lower driving tube to be switched off when short circuit happens and controls the high-voltage NMOS tubes to switch off a charge power supply if a short-circuit phenomenon continues. According to the short-circuit protection circuit disclosed by the invention, a short-circuit detection circuit is mutually independent of an over-current detection circuit, the detection accuracy and the circuit reliability are increased, and the short-circuit protection circuit can be used for the switch-type charge management chip in large charge current.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a short-circuit protection circuit for a drive tube and an inductance in a switch-type charging management chip, which can be applied to the design of an analog integrated circuit. Background technique [0002] At present, with the progress of science and technology, the rapid development of notebook computers, microcomputers, digital cameras, mobile phones and various portable products, electronic equipment is developing towards miniaturization and light weight, which puts forward higher requirements for the power supply industry. In order to ensure the safe charging of lithium-ion batteries and prolong the service life of batteries, it is necessary to further improve the charging technology of lithium-ion batteries. [0003] The charging management chip is an essential part of all kinds of electronic device chargers. Because the switch-type charging management chip ...

AI Technical Summary

Problems solved by technology

[0006] Although this method is simple and intuitive, it cannot distinguish between overcurrent and short circuit. When the charging current is relative

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