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IGBT module driving protection circuit, IGBT module and air conditioning unit

A technology for driving protection circuits and driving circuits, which is applied in the field of IGBT modules and air-conditioning units, IGBT module driving and protection circuits, can solve problems such as easy misconduct, and achieve the effect of improving safety and stability

Pending Publication Date: 2022-07-22
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses an improved way for controlling how much electricity flows into each part of an electronic component called the power semiconductor switch (power transistor). By doing this it prevents damage from overcharged or disordered circuits caused by excessive current flow during normal operation.

Problems solved by technology

This patented technical issue addressed in this patents relates to improving the reliability and performance of power electronic devices such as frequency converter modules while also addressing issues with current methods for protecting them from damage caused during operation.

Method used

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  • IGBT module driving protection circuit, IGBT module and air conditioning unit

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Experimental program
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Effect test

Embodiment 1

[0020] In the preferred embodiment 1 of the present invention, an IGBT module drive protection circuit is provided, specifically, figure 1 An optional circuit diagram showing the drive protection circuit of the IGBT module, such as figure 1 As shown, the IGBT module drive protection circuit includes:

[0021] a drive circuit, the output end of the drive circuit is connected to the gate of the lower arm IGBT unit T2 of the IGBT module; wherein, a first Miller capacitor Cgc1 is connected in parallel between the gate and the collector of the lower arm IGBT unit T2;

[0022] Protection circuit, including: preventing misleading pass transistor V1 and NOT gate device F1, the collector of preventing misleading pass transistor V1 is connected to the gate of the lower-bridge IGBT unit T2, and the emitter of the anti-misleading pass-through transistor V1 is connected to the lower arm IGBT unit The emitter of T2 is connected, and the base of the anti-misleading transistor V1 is connecte...

Embodiment 2

[0031] In a preferred embodiment 2 of the present invention, an IGBT module is provided, and the IGBT module driving protection circuit in the above-mentioned embodiment 1 is used for protection, so as to improve safety.

[0032] In the above embodiment, the IGBT drive circuit is optimized by using a triode and a non-gate device, which consumes the charge generated by the Miller capacitor when the upper bridge arm of the IGBT module is turned on and the lower bridge arm is turned off, thereby preventing the lower bridge arm. The mis-turning action of the arm ensures that only one IGBT of the upper and lower arms is turned on at the same time, which solves the problem that the Miller capacitor of the lower arm is charged due to the conduction of the upper arm, and then the gate voltage of the IGBT of the lower arm is raised, so that the lower arm is turned on. The arm IGBT is misconnected, causing the problem of burning the IGBT through the upper and lower bridge arms, thereby p...

Embodiment 3

[0034] Based on the IGBT module provided in the above-mentioned embodiment 2, a preferred embodiment 3 of the present invention also provides an air-conditioning unit, which adopts the IGBT module in the above-mentioned embodiment 2.

[0035] In the above embodiment, the IGBT drive circuit is optimized by using a triode and a non-gate device, which consumes the charge generated by the Miller capacitor when the upper bridge arm of the IGBT module is turned on and the lower bridge arm is turned off, thereby preventing the lower bridge arm. The mis-turning action of the arm ensures that only one IGBT of the upper and lower arms is turned on at the same time, which solves the problem that the Miller capacitor of the lower arm is charged due to the conduction of the upper arm, and then the gate voltage of the IGBT of the lower arm is raised, so that the lower arm is turned on. The arm IGBT is misconnected, causing the problem of burning the IGBT through the upper and lower bridge ar...

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Abstract

The invention discloses an IGBT module driving protection circuit, an IGBT module and an air conditioning unit, the IGBT module driving protection circuit comprises a driving circuit, the output end of the driving circuit is connected with the grid electrode of the lower bridge arm IGBT unit of the IGBT module, and the output end of the driving circuit is connected with the grid electrode of the lower bridge arm IGBT unit of the IGBT module; wherein a first Miller capacitor is connected in parallel between the grid electrode and the collector electrode of the lower bridge arm IGBT unit; and the protection circuit comprises an anti-misconduction triode and a NOT gate device, the collector electrode of the anti-misconduction triode is connected with the grid electrode of the lower bridge arm IGBT unit, the emitter electrode of the anti-misconduction triode is connected with the emitter electrode of the lower bridge arm IGBT unit, and the base electrode of the anti-misconduction triode is connected with the output end of the driving circuit through the NOT gate device. According to the IGBT module, the problem that in the prior art, an IGBT module is prone to being mistakenly conducted due to the effect of Miller capacitance is solved, the mistakenly-conducted action of the lower bridge arm of the IGBT module is simply and effectively avoided, and the safety and stability of the IGBT module are improved.

Description

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Claims

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Application Information

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Owner GREE ELECTRIC APPLIANCES INC