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Overheat protection circuit

An over-temperature protection circuit and circuit technology, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as inability to realize circuit connection, and achieve the effect of over-temperature protection

Inactive Publication Date: 2011-05-11
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some manufacturing processes, all NMOS devices are fabricated on the same substrate, and this kind of circuit connection cannot be realized in such manufacturing processes

Method used

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0024] In the integrated circuit manufacturing process, it is difficult to accurately realize the resistance value of resistors, but the resistance ratio of similar resistors can be accurately realized. In addition, many circuits are currently powered by power management chips such as LDOs, and the power supply voltage output by them is very accurate and stable. Taking advantage of these characteristics, the power supply voltage can be divided by the resistor divider array, and a set potential that is not affected by the resistance value of the resistor but only related to its ratio can be obtained to replace the original potential obtained by multiplying the original resistance value and the current value. , a more accur...

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PUM

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Abstract

The invention discloses an overheat protection circuit which comprises a resistance voltage division array, a comparator, a negative temperature coefficient voltage branch circuit and an output shaping circuit, wherein the protection circuit works under stable supply voltage; the resistance voltage division array carries out voltage division on the supply voltage to generate setting potential for setting thermal shutoff threshold temperature; the setting potential is compared with the voltage generated by the negative temperature coefficient voltage branch circuit by the comparator to generate a control signal; and the control signal is shaped and output by the output shaping circuit. The overheat protection circuit provided by the invention can overcome the influence of process deviation in the manufacturing process of an integrated circuit, and accurately generates a shutoff signal at a preset temperature spot to control the shutoff of a protected circuit or an auxiliary circuit thereof, thus realizing overheat protection of the circuit. In addition, the protection circuit has no special requirements for the manufacturing process.

Description

technical field [0001] The invention relates to an over-temperature protection circuit, in particular to an over-temperature protection circuit in an analog integrated circuit which can detect the temperature of the circuit and provide protection when the operating temperature is too high. Background technique [0002] Some integrated circuit products such as power supplies and drive devices often face problems such as high operating temperature and excessive heat generation, which cause the circuit to fail to work normally or even burn permanently. This requires the integration of an over-temperature protection circuit into the circuit. The function of the over-temperature protection circuit is to monitor the operating temperature of the circuit, and to operate after the operating temperature of the integrated circuit reaches the set value, to complete functions such as shutting down the circuit and power supply, and to protect the circuit. [0003] The working scheme of th...

Claims

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Application Information

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IPC IPC(8): H02H5/04
Inventor 赵磊张海英黄水龙王小松
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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