A kind of over-temperature protection circuit and driving method

An over-temperature protection circuit and circuit technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as device burnout, device operating voltage temperature drift, abnormal state, etc.

Active Publication Date: 2019-03-26
BOE TECH GRP CO LTD +1
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AI Technical Summary

Problems solved by technology

[0002] For the continuous integration of functions of existing integrated circuits, the increase of circuit scale, the temperature rise caused by power consumption and the increase of ambient temperature will have an impact on the stability of circuit performance. In addition, for the existing integrated circuit chip IC, the internal Devices with integrated over-temperature protection (OTP) function are mostly active devices, such as Power IC RT8510, for passive chips, there is no integrated OTP protection circuit inside, and if such devices work for a long time, due to power consumption temperature rise and ambient temperature The increase of the temperature will cause adverse effects such as temperature drift of the working voltage of the device, causing the passive device to work in an abnormal state, or even burn the device

Method used

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  • A kind of over-temperature protection circuit and driving method
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  • A kind of over-temperature protection circuit and driving method

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Embodiment Construction

[0040] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0041] The steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0042] An embodiment of the present invention discloses an over-temperature protection circuit, which consists of an operational amplifier and a triode to form a constant current source, and a comparator circuit composed of a voltage comparator, an adjusta...

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Abstract

The embodiment of the invention discloses an over-temperature protection circuit and a driving method. The circuit includes: a constant current source circuit, a comparator circuit and an output circuit, the comparator circuit includes a negative temperature coefficient resistor, a first resistor and a voltage comparator, and the comparator circuit compares the first input terminal A voltage and the value of the second voltage at the second input terminal, and output a control signal according to the comparison result, wherein the control signal is an over-temperature control signal when the temperature is greater than or equal to the protection threshold; the output circuit is used for the When the comparator circuit outputs the over-temperature control signal, it outputs a shutdown enable signal. The solution provided by the embodiment of the present invention can shut down the device in time to protect the device when the temperature is too high.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to an over-temperature protection circuit and a driving method. Background technique [0002] For the continuous integration of functions of existing integrated circuits, the increase of circuit scale, the temperature rise caused by power consumption and the increase of ambient temperature will have an impact on the stability of circuit performance. In addition, for the existing integrated circuit chip IC, the internal Devices with integrated over-temperature protection (OTP) function are mostly active devices, such as Power IC RT8510. For passive chips, there is no integrated OTP protection circuit inside. If such devices work for a long time, due to power consumption temperature rise and ambient temperature The increase of the temperature will cause adverse effects such as temperature drift of the working voltage of the device, causing the passive device to work in an abnormal stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H5/04
CPCH02H5/042H02H5/047H02H1/0007
Inventor 江然康海王东辉化磊汤震潘卫卫张宏勋
Owner BOE TECH GRP CO LTD
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