Three-type short circuit protection circuit based on IGBT device terminal voltage drop detection
A short-circuit protection circuit and voltage drop detection technology, which is applied in the direction of electronic circuit testing, measuring electricity, short-circuit testing, etc., can solve the problems of large device impact, unable to limit the current peak value, and limited effect of three types of short-circuit protection, so as to prevent latch-up The effect of failure
Pending Publication Date: 2021-06-29
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology
But for the three types of short circuit (SCⅢ), because the short circuit occurs after the device is turned on, the impact on the device is very large, and the current often rushes up to 6 to 10 times the rated current of the device in a very short time. Conventional short circuit protection strategies cannot To limit the current peak value, the device can only resist the extreme working condition. Most devices cannot withstand the extreme peak value and the latch failure (latch effect) occurs. The conventional protection circuit waits until the Vce reaches the driver protection threshold after the device is desaturated. And after a delay for a period of time (usually 6 ~ 10us), the driver will start the soft shutdown protection
It can be seen that the protection effect of the conventional protection circuit for the three types of short circuit (SCⅢ) is very limited
Method used
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[0030] In order to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings, and the description of this section is merely exemplary and interpretative, and no limitation should be made to the scope of the invention. .
[0031] Such as Figure 1 - Figure 2 As shown, the specific structure of the present invention is: a three-class short-circuit protection circuit based on the terminal pressure drop detection of IGBT device terminal, the IGBT device including a main power terminal E pole, power terminal C pole, auxiliary terminal E pole, auxiliary terminal C Polar and auxiliary Terminal G, the auxiliary terminal E is grounded, and the main power terminal E-pole and the auxiliary terminal E pole and the power terminal C-pole and the auxiliary terminal C pole have package inductance L; three types of short-circuit protection circuitry Including short-circuit protection detectio...
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The invention discloses a three-class short circuit protection circuit based on IGBT device terminal voltage drop detection. The three-class short circuit protection circuit comprises a short circuit protection detection circuit, a logic control circuit and a voltage comparison circuit. The short circuit protection circuit is composed of a resistor R3, a capacitor C1, a diode D1 and a current source circuit. One end of the resistor R3 is connected with +15V level, and the other end of the resistor R3 is connected with the capacitor C1, the anode of the diode D1 and the current source circuit; the other end of the capacitor C1 is grounded; and a resistor R1 and a resistor R2 are respectively connected to the auxiliary terminal g, a triode T1 and a triode T2 are respectively connected between the resistor R1 and the logic control circuit, and a triode T3 is connected between the resistor R2 and the logic control circuit. The converter protection circuit has a protection function for three types of short circuits (SCIII), latch failure (latching effect) of a device when the three types of short circuits (SCIII) occur can be prevented, and the reliability of the converter is improved.
Description
Technical field [0001] The present invention belongs to the technical field of IGBT drivers, and is specifically a three-class short-circuit protection circuit based on the terminal pressure drop detection of IGBT device terminal. Background technique [0002] IGBT (Insulated Gate Bipolartransistor), an insulated gate bipolar transistor, is a core power component that makess various converters. The IGBT is only equipped with a suitable driver to work properly, in order to improve the reliability and life of the variable flow module, the drive It must have an abnormal working condition protection, with the main circuit short circuit is the worst abnormality. [0003] Figure 5 For a common three-phase bridge inverter circuit, consisting of three bridge arms (each bridge arm consists of 2 IGBTs in series, the series in the middle point is the AC output terminal), where Q1 ~ Q6 is 6 IGBT devices, HV + and HV- is a DC input, a positive and negative electrode of the DC voltage, and L1...
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IPC IPC(8): G01R1/36G01R31/52G01R31/28
CPCG01R1/36G01R31/52G01R31/2851
Inventor李淑明刘贤锋刘祎菡廖凯姜玉亭李晓冬
OwnerGUILIN UNIV OF ELECTRONIC TECH