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The circuit has the advantage of accurate temperature detection by using the temperature sensor packed in an IGBT module, and overcomes the defects that a linear optical coupler increased in a general method has high cost and is not suitable for large-batch use; and compared with a method for over-temperature protection by arranging the temperature sensor on the surface of a radiator, the over-temperature protection accuracy is greatly improved without excessively increasing the cost. Under the condition that the cost is not greatly increased by increasing a linear optical coupler isolator, the temperature Tc of an IGBT shell is sampled by using the temperature sensor in the IGBT module, and over-temperature protection is performed at an accurate temperature. A kind of IGBT module thermal-shutdown circuit. The present invention relates to the power technology field, particularly relate to a kind of IGBT module thermal-shutdown circuit. IGBT is easy to drive, control the advantage simple, that switching frequency is high because of its existing power MOSFET; there is the transistorized conducting voltage of power low again; the advantage that on state current is big and in the power electronics industry, being extensive use of; and the one of the main reasons of IGBT module damage to be long-time junction temperature too high and the damage that causes is protected so tackle it when its excess temperature. In recent years in the module of some new encapsulating structures of IGBT, inside is packaged with temperature sensor (N T C), and it is the stable state shell temperature (Tc) of detection power module effectively.The NTC parameter of encapsulation is identical in the module.The temperature sensor that will be used for measurement module shell temperature directly is encapsulated in the interior ceramic substrate (DCB) of module, can simplify the measuring process of module case temperature Tc greatly, and because of it is encapsulated in inside modules, consistency is very high, so that the junction temperature Tj accuracy that shell temperature Tc extrapolates improve greatly.But, must satisfy maintenance safety isolation between any age at failure that may occur according to the requirement of EN50178.Since in the IGBT module NTC may expose under high pressure (for example: during the short circuit or module burn the back), the user also must carry out safe isolation from the outside.Now common practice is to be to deliver to the logic control part after analog signal is isolated with linear optical coupling with temperature inversion, judges that by software state of temperature protects.And the cost of linear optical coupling is higher, is unsuitable for use in enormous quantities. The objective of the invention is to avoid weak point of the prior art and a kind of IGBT module thermal-shutdown circuit is provided. A kind of IGBT module thermal-shutdown circuit comprises the adjustable shunting a reference source of three ends TL431, resistance R 1-R9, negative temperature coefficient resister temperature sensor RT, LM324N operational amplifier U1A, U1B, U1C, U1D, capacitor C 1 and C2; The end of the positive supply termination R8 of U1D and the end of C1, another termination+15V of R8, the output of another termination U1D of C1, the positive input end grounding of U1D; The end of the negative supply termination R9 of U1D and the end of C2, another termination-15V of R9, the output of another termination U1D of C2. Description of drawings. Fig. 1 is the circuit diagram of an embodiment of IGBT module thermal-shutdown circuit of the present invention.
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