over temperature protection circuit

Abstract

The invention relates to an over-temperature protection circuit. The over-temperature protection circuit comprises an over-temperature detection circuit and a signal output circuit. The over-temperature detection circuit comprises a bipolar transistor used for detecting temperature, a first resistor with a positive temperature coefficient and a two-port component with a negative temperature coefficient. When the temperature does not exceed a temperature protection threshold, a second voltage is larger than a first voltage, and a second current is smaller than a first current. When the temperature exceeds the temperature protection threshold, the second voltage is smaller than the first voltage, and the second current is larger than the first current. An output end of the over-temperature detection circuit outputs an over-temperature detection signal for representing temperature change. Under the drive of the over-temperature detection signal, the signal output circuit outputs an over-temperature protection signal for showing that whether or not the temperature exceeds the temperature protection threshold. According to the invention, the circuit structure is simple, the over-temperature protection function is achieved, a few components are required in the circuit, the overall power consumption is low, no voltage comparator and no reference voltage are required, the design difficulty is reduced, and the over-temperature protection threshold can be conveniently adjusted.

Description

technical field [0001] The invention belongs to the technical field of semiconductor integrated circuits, and in particular relates to an over-temperature protection circuit integrated in a chip. Background technique [0002] With the continuous development of semiconductor integrated circuit technology and the progress of semiconductor technology, the integration of integrated circuits is getting higher and higher, and the power consumption is also increasing, which makes the local temperature of the chip too high and causes great damage to the chip. In order to protect the integrated circuit chip from high temperature damage, it is necessary to design a special over-temperature protection circuit. When the temperature exceeds a certain threshold, the over-temperature protection circuit outputs a shutdown signal, so that the chip partially or completely stops working. [0003] The traditional over-temperature protection circuit is generally implemented by a voltage compara...

AI Technical Summary

Problems solved by technology

[0003] The traditional over-temperature protection circuit is generally implemented by a voltage comparator and requires an external input reference voltage signal, so the structure is relatively complex, requiring more components, increasing the difficulty of design, and the power consumption of the circuit is also large

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