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

A charging management chip and short-circuit protection circuit technology, which is applied in the design of analog integrated circuits and the field of short-circuit protection circuits, can solve the problems of being unable to distinguish between over-current and short-circuit, and achieve the effect of ensuring circuit response speed and improving circuit reliability

Active Publication Date: 2013-11-20
深圳德信微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 relatively large, it is easy to trigger short circuit protection. Therefore, this short circuit protection scheme can only be applied to small current chargers.

Method used

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

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawings and embodiments thereof.

[0028] refer to figure 2 , the present invention is used for the short-circuit protection circuit of drive tube and inductance in the switch-type charge management chip, including 2 high-voltage NMOS tubes M 1 and M 2 , the lower pipe detection unit 1, the upper pipe detection unit 2 and the logic drive unit 3. in:

[0029] The high voltage NMOS tube M 1 and M 2 , whose gate is connected and connected to the control signal V input by the logic drive unit 3 G , its source is connected and connected to the logic drive unit 3; the high-voltage NMOS transistor M 1 The drain of the charge management chip is connected to the input voltage V IN Connected, high voltage NMOS tube M 2 The drain output charging voltage V HI .

[0030] The logic drive unit 3 generates the upper tube drive signal V according to the comparison signal PWM generated insi...

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PUM

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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 ...

Claims

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Application Information

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IPC IPC(8): H03K17/08H03K17/22
Inventor 来新泉李演明邵丽丽唐起源
Owner 深圳德信微电子有限公司
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