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Low dropout linear regulator overload protection circuit

An overload protection circuit, low-dropout linear technology, applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve the problems of complex regulation circuits and general adjustability, and achieve simple circuit structure, strong adjustability, Good effect of adjusting linearity

Active Publication Date: 2021-02-12
SHENZHEN RES INST OF NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] "Foldback" power limit method: the adjustability of the circuit is average, the power (temperature) threshold and the linear decline slope of the current are fixed, and the adjustment circuit is relatively complicated

Method used

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  • Low dropout linear regulator overload protection circuit
  • Low dropout linear regulator overload protection circuit
  • Low dropout linear regulator overload protection circuit

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Embodiment Construction

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] A low dropout linear voltage regulator overload protection circuit of the present invention comprises,

[0035] A low-dropout linear regulator, which is a power supply module of the circuit system and is controlled to adjust the output voltage and current;

[0036] The main circuit module monitors in real time and generates a control current according to the temperature chang...

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Abstract

The invention provides an overload protection circuit for a low-dropout linear voltage regulator, which includes a low-dropout linear voltage regulator, which is a power supply module of the circuit system and is controlled to adjust the output voltage and current; the main circuit module monitors in real time According to the change of temperature, the control current is generated and input to the low-dropout linear regulator to adjust the output power, and the temperature node and change rate of power change can be configured through digital signals. The circuit structure of the present invention is simple, and the adjustability is strong, and the power (temperature) threshold can be adjusted in real time according to the output of the low-dropout linear voltage regulator; and the linearity can be adjusted independently of the limit output current corresponding to a certain power (temperature). Well, it can be applied to different application requirements.

Description

technical field [0001] The invention relates to the technical field of circuit protection and power supply management, in particular to an overload protection circuit for a low-dropout linear regulator. Background technique [0002] When the low dropout linear regulator supplies power to the circuit system, the circuit starts to work. A large part of the output power of the power supply is converted into heat. With the accumulation of heat, the temperature gradually rises, and the performance of the circuit begins to decline. When the temperature rises to a certain level, the circuit may be damaged. Therefore, the circuit system needs a protection mechanism: when the temperature reaches a certain level, the output power of the low dropout linear regulator will decrease; when the temperature gradually drops, the output power of the low dropout linear regulator will gradually decrease. increase. In addition, in order to increase the practicality and universality of the circ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/625
CPCG05F1/625
Inventor 肖知明胡伟波马伟房哲
Owner SHENZHEN RES INST OF NANKAI UNIV
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