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Short circuit detection circuit, short circuit protection circuit and chip

A short-circuit detection and circuit technology, applied in emergency protection circuit devices, short-circuit testing, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. Easy-to-chip effects

Active Publication Date: 2021-10-01
SHANGHAI XINLONG SEMICON TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a short-circuit detection circuit, a short-circuit protection circuit and a chip to solve the problem that the short-circuit detection circuit in the prior art is prone to misjudgment whether a short circuit occurs in the system

Method used

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  • Short circuit detection circuit, short circuit protection circuit and chip
  • Short circuit detection circuit, short circuit protection circuit and chip
  • Short circuit detection circuit, short circuit protection circuit and chip

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Embodiment Construction

[0059] In order to make the purpose, advantages and features of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in very simplified form and not drawn to scale, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention. In addition, the structures shown in the drawings are often a part of the actual structure. In particular, each drawing needs to display different emphases, and sometimes uses different scales.

[0060] As used in the present invention, the singular forms "a", "an" and "the" include plural objects, the term "or" is usually used in the sense of including "and / or", and the term "several" Usually, the term "at least one" is used in the meaning of "at least one", and the term "at least two" is usually used in the meaning of "two or more". In a...

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Abstract

The invention provides a short circuit detection circuit, a short circuit protection circuit and a chip. Wherein, the short circuit detection circuit includes a signal processing unit. When the signal at the input end of the short-circuit detection circuit meets the first preset condition, the signal processing unit hysteresis the signal, so that the short-circuit detection circuit does not directly output the short-circuit alarm signal until the duration of meeting the first preset condition exceeds the preset time. The short-circuit detection circuit outputs a short-circuit alarm signal after a set time period. At the same time, the signal processing unit is corrected by using a temperature compensating element, so that it has higher precision under different temperature environments. Such a configuration solves the problem that the short-circuit detection circuit in the prior art is prone to misjudgment whether there is a short-circuit in the system, and also has the advantages of accurate timing and easy chip integration.

Description

technical field [0001] The invention relates to the technical field of power supply chips, in particular to a short-circuit detection circuit, a short-circuit protection circuit and a chip. Background technique [0002] When the output of the power supply system is short-circuited, if it is not properly protected, it is easy to cause chip failure or large energy loss and heat generation, so the power supply will have various short-circuit protection circuits. The common short-circuit judgment is to detect the voltage of the feedback pin of the chip. If the voltage of the feedback pin is significantly lower than the voltage during normal operation, it is considered to be a system short-circuit. However, this method may cause misjudgment when the system starts or the load changes suddenly. Interfere with normal work. [0003] This method has the following problems: [0004] 1) When the system is just powered on and the output voltage has not yet been established, the chip fe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52H02H9/02
CPCG01R31/52H02H9/02
Inventor 许锦龙刘彬李瑞平
Owner SHANGHAI XINLONG SEMICON TECH CO LTD
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