Temperature difference detection circuit used for over-temperature protection

Abstract

The invention belongs to the technical field of integrated circuits and provides a temperature difference detection circuit for over-temperature protection. The circuit comprises a temperature detection circuit and a temperature difference comparison circuit; the temperature detection circuit is used for detecting the temperature of a first detection point; and the temperature difference comparison circuit is used for detecting the temperature of a second detection point and comparing the temperature of the second detection point with the temperature of the first detection point to obtain thetemperature difference between the second detection point and the first detection point. According to the temperature difference detection circuit used for the over-temperature protection of the invention, over-temperature protection and over-temperature difference protection of two or more heating points can be realized.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a temperature difference detection circuit for over-temperature protection. Background technique [0002] As the chip integration becomes higher and higher, the performance is better and better, and the power consumption is larger and larger, so that the temperature of the chip will rise rapidly when the integrated circuit is used for a long time or under abnormal conditions such as short circuit. High temperature will affect the stability of the chip. Overheating will cause the chip to fail to work normally or even damage its electronic components. Over-temperature protection is especially important in high-performance integrated circuits. [0003] In the power switch chip, due to the complex application scenarios, the power switch load may be short-circuited, and the power supply voltage will be directly connected to the turned-on power switch, and the instantaneous...

AI Technical Summary

Problems solved by technology

Existing over-temperature protection circuits usually can only detect the temperature of one heating point in the chip, and cannot compare the temperature difference of different heating points in the chip. Only when the temperature of the detected heating point reaches the set value, it will trigger and work. Over-temperature protection cannot be realized; however, at this time, the temperature of the heat-generating points in different parts of the chip is inconsistent, and other heat-generating points are overheated (exceeding the set value) and cannot trigger the over-temperature protection, which will cause the chip to be thermally damaged

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