Overvoltage and excess temperature detection circuit

Abstract

The invention discloses an overvoltage and excess temperature detection circuit, which aims to monitor temperature and first voltage. The overvoltage and excess temperature detection circuit comprises a voltage limitation circuit, a temperature sensing circuit, a current source circuit, and a first comparison circuit and a second comparison circuit; the voltage limitation circuit is connected between an end point of the first voltage and a detection end to limit and control the magnitude of the electric energy of the first voltage sent to the detection end; the temperature sensing circuit is connected between the detection end and a common terminal and equivalent resistance of the temperature sensing circuit changes along with the temperature; the current source circuit is connected to the detection end to provide first current for the detection end so as to generate detection voltage; the first comparison circuit and the second comparison circuit compare the voltage value of the detection voltage, a first reference voltage value and a second reference voltage value respectively; when the temperature is greater than a temperature upper limit, the temperature state signal is in an enabling state; and when the voltage value of the first voltage is greater than the voltage upper limit, the voltage state signal is in an enabling state. The circuit is relatively simple, the complexity, cost and volume of the whole circuit can be reduced and the requirement of the current small-sized electronic products is met.

Description

technical field [0001] The invention relates to a detection circuit, in particular to an overvoltage and overtemperature detection circuit. Background technique [0002] In recent years, with the advancement of science and technology, electronic products with various functions have been gradually developed. These electronic products with various functions not only meet the various needs of people, but also integrate into everyone's needs. Daily life makes people's life more convenient. [0003] These various electronic products with different functions are composed of various electronic components. Each electronic component needs to operate normally at an appropriate voltage and temperature. Therefore, designers will design appropriate voltage values ​​according to the characteristics of each electronic component. With the heat sink, so that the electronic products can run normally. However, the operating temperature of electronic components will rise correspondingly with ...

AI Technical Summary

Problems solved by technology

[0005] Since the traditional over-voltage detection circuit and the over-temperature detection circuit are independent and relatively complex circuits, electronic products need to be equipped with traditional over-voltage detection circuits and over-temperature detection circuits with relatively complicated circuits, which will not only increase the complexity of the overall circuit, but also It will increase the cost and volume, and cannot meet the requirements of today's small electronic products

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