Pure field effect transistor low-power-consumption over-temperature protection circuit

Abstract

The invention discloses a pure field effect transistor low-power-consumption over-temperature protection circuit which comprises a biasing circuit, a temperature and voltage conversion circuit, a selection circuit, a comparator and a digital output circuit. The output of the biasing circuit is connected with the input of the temperature and voltage conversion circuit. The output of the temperature and voltage conversion circuit is connected with the input of the selection circuit and the input of the comparator. The output of the comparator is connected with the input of the selection circuit. The output of the selection circuit is connected with the input of the comparator. Low power consumption of 340nA quiescent current is achieved, hysteresis comparison of temperature is achieved, use of triodes is avoided, use of resistors is avoided, and use of a starting circuit is avoided.

Description

technical field [0001] The invention belongs to the technical field of temperature protection circuits, and in particular relates to a pure field effect tube low-power over-temperature protection circuit. Background technique [0002] The current analog integrated circuit manufacturing industry has been extremely developed, and the area is getting smaller and smaller. The resulting heat dissipation problem has gradually become an urgent development direction in chip design. Until this problem is perfectly solved, the thermal protection circuit seems to be a palliative solution. When the temperature is greater than the cut-off temperature T stop , the over-temperature protection circuit stops the chip from working to prevent the chip from being burned out; after the chip stops working, the temperature drops, and when the temperature is lower than the restart temperature T rst , the over-temperature protection circuit will make the chip work again (T stop >T rst ), and ...

AI Technical Summary

Problems solved by technology

[0010] 3. A low-power temperature protection circuit using a negative temperature coefficient current source. The circuit does not use bipolar transistors, and uses the current characteristics of field effect transistors to temperature to cooperate with resistance to realize over-temperature protection. It does not use triodes and does not need to start In addition, the circuit uses a field effect transistor working in the sub-threshold region to achieve the requirement of low power consumption, but the disadvantage is that a large resistor is still used, which occupies a certain area

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