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An overcurrent protection circuit and switching power supply chip

A technology of overcurrent protection circuit and switching power supply chip, which is applied in the direction of electrical components, adjusting electric variables, converting DC power input to DC power output, etc., and can solve the problem that the switching power supply chip cannot accurately detect the output overcurrent.

Active Publication Date: 2021-09-10
SHANGHAI XINLONG SEMICON TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the technical problem that the existing switching power supply chip cannot accurately detect the output overcurrent and limit the output current within a safe range in time

Method used

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  • An overcurrent protection circuit and switching power supply chip
  • An overcurrent protection circuit and switching power supply chip
  • An overcurrent protection circuit and switching power supply chip

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Embodiment Construction

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some of the embodiments of the present disclosure, not all of them. Based on the described embodiments of the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative effort fall within the protection scope of the present disclosure.

[0028] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importan...

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Abstract

The invention discloses an overcurrent protection circuit and a switching power supply chip, which are used to protect the power tube inside the switching power supply chip, including a reference current source module, an overcurrent detection module and an oscillator module; When the current of the power tube reaches the overcurrent protection point, the triode in the overcurrent detection module is turned on, and charges the energy storage capacitor in the oscillator module, increasing the charging current of the energy storage capacitor to make the energy storage capacitor The voltage of the energy storage capacitor accelerates to the preset value. When the voltage of the energy storage capacitor reaches the preset value, the rectangular wave output by the oscillator module turns to a high level, and the driving circuit module in the switching power supply chip receives this high level. After the power level signal is turned off, the power transistor inside the switching power supply chip is driven to be turned off to realize overcurrent protection. The invention is suitable for switching power supply chips using power triodes and power MOS tubes as switching tubes, and meets the overcurrent protection requirements of buck-type and boost-type switching power supply chips.

Description

technical field [0001] The invention relates to the technical field of power supply chips, in particular to an overcurrent protection circuit and a switching power supply chip, which are suitable for overcurrent protection of step-down and boost-type switching power supply chips. Background technique [0002] When the switching power supply management chip is working normally, in order to limit the current within a certain safe range and avoid damage to the circuit and load caused by the excessive output current of the chip, it is necessary to integrate an output over-current detection protection circuit inside the chip to play a role when the chip outputs The function of limiting the output current within a safe range in time during overcurrent. [0003] Switching power supply chips are divided into step-down (Buck) switching power supply chips, boost (Boost) switching power supply chips, etc.; switching power supply chips are divided into PWM (pulse width modulation), PFM ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M3/158
CPCH02M1/32H02M3/158
Inventor 贾生龙李瑞平刘彬
Owner SHANGHAI XINLONG SEMICON TECH CO LTD
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