Common mode interference signal suppression circuit of intelligent power module and intelligent power module

Abstract

The invention discloses a common mode interference signal suppression circuit of an intelligent power module. The circuit comprises: a first mirror image current source, a second mirror image current source, a first resistor, a second resistor, a first Schmitt trigger and a second Schmitt trigger, wherein the first mirror image current source possesses a reference input terminal and an output terminal; the second mirror image current source possesses the reference input terminal and the output terminal; the first resistor is connected between the output terminal of the first mirror image current source and the reference input terminal of the second mirror image current source; the second resistor is connected between the output terminal of the second mirror image current source and the reference input terminal of the first mirror image current source; the input terminal of the first Schmitt trigger is connected with the output terminal of the first mirror image current source; the input terminal of the second Schmitt trigger is connected with the output terminal of the second mirror image current source. The circuit can be used in an intelligent power module.

Description

technical field [0001] The invention relates to an intelligent power module, in particular to a common-mode interference signal suppression circuit of the intelligent power module. Background technique [0002] Intelligent power module drive circuits can be isolated with transformers. See image 3 , which reveals a schematic diagram of a prior art smart power module. When PW1=1, PW2=0, VOUT=V+, IGBT T1 is turned on, and IGBT T2 is turned off. When PW1 changes from PW1=1 to PW1=0, PW2 is still equal to 0. At this time, IGBT T1 is turned off. , the current continues to flow through IGBT T2, causing the output voltage VOUT to suddenly jump from V+ to V-. Since the entire secondary side S1 and VOUT share the same potential, the secondary side S1 also suddenly jumps from V+ to V-, and the primary side S3 also jumps Immediately following the jump, the secondary side S2 also jumps, because there will be parasitic capacitance between the inductors, such as the parasitic capacitanc...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the driving circuit of the intelligent power module adopts transformer isolation in the prior art, common-mode interference signals exist at both ends of the transformer, which interferes with the reading of the normal switch signal, and has potential safety hazards, the present invention provides a common mode of the intelligent power module. Mode interference signal suppression circuit and intelligent power module

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