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Overcurrent protection circuit of electric drive controller for electric vehicle

An overcurrent protection circuit and electric drive technology, applied in emergency protection circuit devices, overcurrent protection, electrical components, etc., can solve long protection time, IGBT damage of insulated gate bipolar transistor, automobile danger, etc. problem, to achieve the effect of increasing reliability, ensuring safety and shortening protection time

Active Publication Date: 2013-11-06
HEFEI JUYI POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The overcurrent protection in the prior art is mainly to realize the protection function through software after detecting the overcurrent fault of the bus bar and the phase line. The protection time of the software is longer than that of the hardware protection, which directly leads to the damage of the insulated gate bipolar transistor IGBT ; For IGBT faults, directly shut down the six-way PWM pulse signal through hardware, which will cause danger to driving cars

Method used

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  • Overcurrent protection circuit of electric drive controller for electric vehicle
  • Overcurrent protection circuit of electric drive controller for electric vehicle
  • Overcurrent protection circuit of electric drive controller for electric vehicle

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Embodiment Construction

[0020] The characteristics of the overcurrent protection circuit of the electric vehicle electric drive controller in this embodiment are: it is composed of an overcurrent latch circuit, a module protection logic circuit and an AND gate shutdown circuit, wherein:

[0021] The over-current latch circuit is used to maintain the over-current state of the busbar and phase line of the electric drive controller, and input the over-current fault signal I_OVER to the gate logic shutdown circuit to turn off the six driving signals of the insulated gate bipolar transistor IGBT PWM1_OUT, PWM2_OUT, PWM3_OUT, PWM4_OUT, PWM5_OUT, PWM6_OUT;

[0022] The module protection logic circuit transmits the fault signal FO to the DSP chip when the overcurrent faults FOU, FOV, and FOW of the insulated gate bipolar transistor IGBT of the electric drive controller occur;

[0023] The overcurrent faults FOU, FOV, and FOW of the insulated gate bipolar transistor IGBT of the electric drive controller are t...

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Abstract

The invention discloses an overcurrent protection circuit of an electric drive controller for an electric vehicle. The overcurrent protection circuit is characterized in that six paths of drive signals of an insulated gate bipolar transistor (IGBT) can be immediately switched off when bus or phase wire overcurrent exists in the electric drive controller for the electric vehicle; and when one path of the IGBT has an overcurrent failure, one path of failed drive signal is switched off, and the IGBT operates in a limping home manner. According to the invention, not only is the overcurrent protection of the electric drive controller for the electric vehicle realized, but also a motor can be ensured and maintained to operate continuously when the IGBT has the overcurrent failure, thus the safety of the electric vehicle is ensured.

Description

technical field [0001] The invention relates to an overcurrent protection circuit, more specifically an overcurrent protection circuit for an electric drive controller of an electric vehicle. Background technique [0002] Under the background that low-carbon economy has become the mainstream of the times, electric vehicles have become the main direction of current automobile development. The electric drive system is the power source of electric vehicles, which directly affects the performance of the whole vehicle. When the electric drive controller of an electric vehicle is short-circuited, rapid acceleration, rapid deceleration and overload, etc., over-current faults are prone to occur and affect the performance of the complete vehicle. Overcurrent faults are mainly abrupt and peak current values. The overcurrent protection in the prior art is mainly to realize the protection function through software after detecting the overcurrent fault of the bus bar and the phase line....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00H02H7/20H02H3/08
Inventor 林巨广王淑旺孙纯哲赵志军郗世洪周政苑红伟程胜民郭行桂星星
Owner HEFEI JUYI POWER SYST CO LTD
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