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Driving protection circuit of IGBT module, and air conditioner

A technology for driving protection circuits and driving chips, applied in electrical components, electronic switches, pulse technology, etc., can solve the problems of driving signal interference, affecting IGBT driving control, etc., and achieve the effect of ensuring accuracy, eliminating interference, and improving accuracy

Active Publication Date: 2018-07-10
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this scheme, when the IGBT is working, the driving signal of the lower bridge IGBT flows in from the G pole of the lower bridge IGBT, and then flows out from the emitter, which will be coupled with the power current (that is, the working current of the IGBT obtained by sampling), so that the power current It will interfere with the drive signal and affect the drive control of the IGBT

Method used

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  • Driving protection circuit of IGBT module, and air conditioner
  • Driving protection circuit of IGBT module, and air conditioner
  • Driving protection circuit of IGBT module, and air conditioner

Examples

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Effect test

Embodiment 1

[0037] image 3 It is a structural block diagram of the driving protection circuit of the IGBT module according to the embodiment of the present invention.

[0038] In this embodiment, the upper side IGBT is figure 2 In Q1, the lower bridge IGBT is figure 2 Q2 in the lower bridge IGBT is set to drive the emitter EQ2 (corresponding to figure 2 Pin14) and the power transmitter PEQ (corresponding figure 2 Pin17) to clean the drive signal.

[0039] Such as image 3 As shown, the driving protection circuit 100 includes: a sampling unit 10 , an overcurrent protection unit 20 and a driving unit 30 .

[0040] Specifically, the sampling unit 10 is connected to the power transmitting end PEQ2, and the sampling unit 10 is used to sample the current of the lower bridge IGBT; the overcurrent protection unit 20 is connected to the sampling unit 10, and the overcurrent protection unit 20 is used to judge the When the lower bridge IGBT is over-current, the lower bridge IGBT is over-...

Embodiment 2

[0087] Figure 9 is a structural block diagram of an air conditioner according to an embodiment of the present invention. Such as Figure 9 As shown, the air conditioner 1000 includes the drive protection circuit 100 of the IGBT module of the above-mentioned embodiment.

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Abstract

The invention provides a driving protection circuit of an IGBT module, and an air conditioner, wherein the IGBT module comprises an upper bridge IGBT and a lower bridge IGBT, the lower IGBT is provided with a driving transmitting end and a power transmitting end so as to purify a driving signal; and the driving protection circuit comprises a sampling unit, an overcurrent protection unit and a driving unit, wherein the sampling unit is connected with the power transmitting end and used for sampling current of the lower bridge IGBT; the overcurrent protection unit is connected with the samplingunit and used for performing overcurrent protection for the lower bridge IGBT when overcurrent happens in the lower bridge IGBT; and the driving unit comprises a first driving chip and a second driving chip, a first ground end of the second driving chip is grounded, and the second ground end of the second driving chip is connected to the driving transmitting end so as to realize isolation betweenthe first ground end and the second ground end and the second ground end is grounded through the power transmitting end, and thus, the second driving chip is facilitated to bear a common mode voltageintroduced by the sampling unit. The driving protection circuit can purify the driving signal while guaranteeing accuracy of overcurrent protection.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a drive protection circuit for an IGBT module and an air conditioner. Background technique [0002] At present, most light commercial electronic control systems use IPM (Intelligent Power Module, Intelligent Power Module) to drive the compressor of the air conditioner, but IPM has poor compatibility and can easily become a bottleneck in supply. IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) has gradually replaced IPM as the uninterruptible power supply technology because of its good compatibility, reliable supply, and faster update speed than IPM, which helps to improve the overall performance of electronic control. mainstream technology. [0003] However, the manufacturer has strict restrictions on the safe working area provided by the IGBT, and the time for the IGBT to withstand the overcurrent is only a few microseconds, and the overcurre...

Claims

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Application Information

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IPC IPC(8): H03K17/0812H03K17/567
CPCH03K17/08128H03K17/567H03K2217/0081
Inventor 杨建宁
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD