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igbt protection circuit, method, device and three-phase inverter circuit

A protection circuit and device technology, applied in the field of IGBT protection circuit and three-phase inverter circuit, can solve the problems of limiting the working range of the inverter and the inability to fully utilize the output capacity of the IGBT.

Active Publication Date: 2021-02-05
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to address the defects that the traditional IGBT protection circuit has the same voltage protection threshold when the output current is at different current points, so that the output capability of the IGBT cannot be fully utilized and the working range of the inverter is limited, and a kind of IGBT protection circuit, method, device and three-phase inverter circuit

Method used

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  • igbt protection circuit, method, device and three-phase inverter circuit

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Experimental program
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Effect test

Embodiment 1

[0060] figure 1 It is the structural diagram of the IGBT protection circuit module of Embodiment 1, such as figure 1 As shown, the IGBT protection circuit of Embodiment 1 includes an adder module 100 and a comparator module 101;

[0061] The input terminal of the adder module 100 is used to access the DC bus voltage U dc and the output current I of the IGBT to be protected c , the adder module 100 is used to calculate the DC bus voltage U dc and output current I c Implement the addition operation;

[0062] Among them, the DC bus voltage U dc That is, the DC bus voltage of the inverter circuit applying the IGBT to be protected, the output current I c is the current flowing through the IGBT to be protected. Among them, the output current I c After inputting into the adder module, according to the characteristics of the input interface of the adder module, the output current I c Converted to the corresponding correction voltage. To the DC bus voltage U dc and output cu...

Embodiment 2

[0090] An embodiment of the present invention also provides a three-phase inverter, including an IGBT protection circuit, a first IGBT, a second IGBT, a third IGBT, a fourth IGBT, a fifth IGBT, and a sixth IGBT;

[0091] The emitter of the first IGBT is connected to the collector of the second IGBT, and the collector of the first IGBT and the emitter of the second IGBT are used to connect the DC bus voltage U dc ;

[0092] The emitter of the third IGBT is connected to the collector of the fourth IGBT, and the collector of the third IGBT and the emitter of the fourth IGBT are used to access the DC bus voltage U dc ;

[0093] The emitter of the fifth IGBT is connected to the collector of the sixth IGBT, and the gap between the collector of the fifth IGBT and the emitter of the sixth IGBT is used to access the DC bus voltage U dc ;

[0094] The IGBT protection circuit includes an adder module and a comparator module;

[0095] The input terminal of the adder module is used to ...

Embodiment 3

[0100] Figure 5 It is the flow chart of the IGBT protection method of embodiment three, such as Figure 5 As shown, the IGBT protection method of the third embodiment includes steps S100 to S102:

[0101] S100, get the DC bus voltage U dc and the output current I of the IGBT to be protected c ;

[0102] S101, according to the output current I c The product of the preset resistance value is obtained to obtain the corrected voltage;

[0103] Wherein, the magnitude of the correction voltage can be adjusted by adjusting the preset resistance value. The smaller the preset resistance value, the higher the output capability of the IGBT to be protected. Wherein, the preset resistance value may correspond to the type of the IGBT to be protected.

[0104] S102, if the DC bus voltage U dc and the sum of the correction voltage is greater than the reference voltage V ref , turn off the IGBT to be protected.

[0105] After obtaining the corrected voltage, calculate the DC bus vol...

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Abstract

The invention relates to an IGBT protection circuit, a method, a device and a three-phase inverter circuit, which input and output current to an adder module to obtain a voltage corresponding to the output current, obtain the sum of the voltage and the DC bus voltage and represent it as the first the voltage at the input terminal, and compare the voltage at the first input terminal with the reference voltage through the comparator module, and when the voltage at the first input terminal is greater than the reference voltage, turn off the IGBT through the output terminal of the comparator module. Based on this, when the output current is small, a higher DC bus voltage is allowed, that is, the voltage overvoltage threshold of the IGBT is increased, so as to fully utilize the output capability of the IGBT and broaden the working range of the inverter.

Description

technical field [0001] The invention relates to the technical field of power supply circuits, in particular to an IGBT protection circuit, method, device and three-phase inverter circuit. Background technique [0002] A three-phase inverter is a power supply device that converts direct current into alternating current, and is mainly used in communication, factory and enterprise uninterruptible power supply systems. Among them, IGBT (Insulated Gate Bipolar Transistor) is a high-power semiconductor switching tube and is the core component of modern inverters. During the working process of the inverter, the IGBT must be guaranteed to work within a safe range, that is, the DC bus voltage and the output current flowing through the IGBT cannot exceed the allowable value. Among them, the range that can ensure the safe operation of the IGBT is called the safe working area. [0003] The working mode of the traditional IGBT protection circuit is to set the voltage overvoltage thresho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/081H03K17/567
CPCH03K17/08116H03K17/567
Inventor 夏铸亮刘呈超王明亮杨康陈平赵小坤
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD
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