A kind of over-temperature protection circuit for power module
An over-temperature protection circuit and power module technology, applied in emergency protection circuit devices, automatic disconnection emergency protection devices, circuit devices, etc., can solve the problems of normal operation and reliability effects of intelligent power modules, and prevent thermal oscillations. phenomenon, the effect of simple circuit structure and high reliability
Active Publication Date: 2017-08-25
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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However, as the temperature of the intelligent power module drops, the PNP transistor Q1' will be cut off again, and V OUT At this time, the intelligent power module starts to work normally again, causing the temperature of the intelligent power module to rise again, and so on, causing the intelligent power module to undergo thermal oscillation near the over-temperature protection threshold point. This thermal oscillation is harmful to the intelligent The normal operation and reliability of the power module have a great influence
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[0029] The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.
[0030] The following disclosure provides many different embodiments or examples for implementing different structures of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purp...
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The invention discloses an over-temperature protection circuit for a power module, which includes: a detection module for detecting the temperature of the power module to generate a detection signal; an output response module connected to the detection module, including a first NMOS tube and a Zener diode with a first node between them, the voltage of the first node changes according to the detection signal, and the output response module outputs a control signal according to the voltage of the first node; the positive feedback thermal hysteresis module, the positive feedback thermal hysteresis module and the output The response module is connected to the detection module, and is used to adjust the detection signal according to the control signal to achieve thermal hysteresis; the protection module, connected to the output response module, is used to control the power module to stop working according to the control signal to realize the protection of the power module. The over-temperature protection circuit for the power module can accurately detect the temperature of the power module, has a thermal hysteresis function, and can effectively prevent thermal oscillation from occurring.
Description
technical field [0001] The invention relates to the technical field of over-temperature protection circuits, in particular to an over-temperature protection circuit for power modules. Background technique [0002] Intelligent power module is an advanced hybrid integrated circuit that integrates power semiconductor devices, gate drive circuits and protection circuits. It is widely used in various fields such as variable frequency home appliances, inverter power supplies and industrial electrical automation. The intelligent power module is a high-power semiconductor device, and it will generate a high temperature during operation. Therefore, an over-temperature protection circuit is generally included in it to realize real-time monitoring of the temperature inside the module, and start the over-temperature protection when the temperature exceeds the standard. circuit to achieve the purpose of protecting the intelligent power module. [0003] Conventional over-temperature prot...
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IPC IPC(8): H02H7/10H02H5/04
Inventor 华庆程德凯黄祥钧李泽宏张波
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD