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A low power consumption anti-jamming over-temperature protection circuit

An over-temperature protection circuit and resistance technology, applied in the direction of adjusting electrical variables, instruments, control/regulating systems, etc., can solve the problems of overheating and burnout of semiconductor components, achieve large margin, prevent chip temperature from being too high, anti-interference powerful effect

Active Publication Date: 2021-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these solutions need to output the chip shutdown signal when the temperature exceeds a certain threshold, which has a certain hysteresis. Obviously, such a hysteresis will cause some high-temperature semiconductor components to overheat and burn out.

Method used

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  • A low power consumption anti-jamming over-temperature protection circuit
  • A low power consumption anti-jamming over-temperature protection circuit
  • A low power consumption anti-jamming over-temperature protection circuit

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Embodiment Construction

[0028] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0029] The present invention utilizes the reference voltage VREF_CTAT having CTAT (inversely proportional to absolute temperature) characteristics to compare with reference voltages Vbias-ref_4 and Vbias-ref_5 having PTAT (proportional to absolute temperature) characteristics to obtain over-temperature flag signal OT_H, wherein the absolute The temperature-inversely proportional reference voltage VREF_CTAT can be determined by as figure 1 shown in the reference voltage generation block generated.

[0030] Such as figure 1 As shown, the reference voltage generating module in this embodiment includes a first resistor R 1 , the second resistance R 2 , the third resistor R 3 , the fourth resistor R 4 , the first transistor Q1, the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the first NMOS transistor NM1, the secon...

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Abstract

The invention relates to a low-power anti-interference over-temperature protection circuit, which belongs to the technical field of over-temperature protection. The invention uses two reference voltages with PTAT characteristics to set the hysteresis window for temperature detection, combined with the reference voltage with CTAT characteristics to realize over-temperature detection, and solves the hysteresis caused by only setting one temperature detection value in the traditional over-temperature protection circuit. The problem of burning out can prevent the life of the device from being too high when the chip temperature is too high; and compared with the reference voltage with zero temperature coefficient used by the traditional over-temperature protection circuit, the present invention can achieve a larger hysteresis window margin and stronger anti-interference ability ; The present invention adjusts any one or more of the voltage change slope of the reference voltage and the voltage change slope of the two reference voltages according to the required hysteresis amount of the temperature detection hysteresis window, and adopts a cascode structure to achieve high precision and low power consumption.

Description

technical field [0001] The invention belongs to the technical field of over-temperature protection, and relates to an over-temperature protection circuit with low power consumption and anti-interference. Background technique [0002] With the improvement of chip integration, the power density is also increasing. The power consumption generated during the working process of the chip will increase the temperature of the chip. Excessively high temperature will cause the performance of the device to decline and the life of the device will be damaged. Therefore, it is necessary to add an over-temperature protection circuit for it. Ordinary over-temperature protection circuits use temperature-sensitive components to detect changes in the internal temperature of the chip. When the temperature is higher than a certain value, the circuit will generate a control signal to shut down the chip until the temperature returns to normal, and the chip will start again. normal work. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/569
CPCG05F1/569
Inventor 周泽坤王佳文肖志平石跃王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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