Over-current protection circuit of controller of motor of automobile

An overcurrent protection circuit and motor controller technology, applied in the field of circuits, can solve problems such as slow response speed, inability to protect power devices overcurrent, and inability to set overcurrent protection values, achieving fast response speed, simple structure, and low cost. low effect

Active Publication Date: 2015-04-15
杜丽红
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The reaction speed of overcurrent protection after software detection is slow, and the occurrence of overcurrent of power devices cannot be measured in time. It takes a long time to turn off the output signal after detection, and the time from overcurrent to damage of power devices is very short. , so software protection cannot provide overcurrent protection for power devices well
The oversaturation detection of the integrated driver chip can quickly detect and turn off quickly, but the overcurrent protection value cannot be set, and it cannot provide overcurrent protection for power devices well when the continuous large current does not cause oversaturation

Method used

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  • Over-current protection circuit of controller of motor of automobile

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0017] like figure 1 As shown, an automotive motor controller overcurrent protection circuit in this embodiment includes a trigger hold circuit connected to the trigger signal output end of the overcurrent judgment circuit, and a reset circuit connected to the trigger hold circuit. The input end of the reset circuit is also It is connected to the reset signal output terminal of the motor main control chip, and the output terminal of the above-mentioned trigger and hold circuit is also connected to the power device drive chip.

[0018] The above trigger and hold circuit includes a comparator U2B, a comparator U2C, a comparator U2D and a voltage divider circuit, wherein: the non-inverting input terminal of the comparator U2B, the inverting input terminal of the comparator ...

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Abstract

The invention discloses an over-current protection circuit of a controller of a motor of an automobile. The over-current protection circuit comprises a trigger holding circuit and a reset circuit. The trigger holding circuit is connected with a trigger signal output end of an over-current judgment circuit, the reset circuit is connected with the trigger holding circuit, an input end of the reset circuit is further connected with a reset signal output end of a master control chip of the motor, and an output end of the trigger holding circuit is further connected with a driving chip of a power device. The over-current protection circuit has the advantages of high response speed, low cost and the like, and can timely protect the power device.

Description

technical field [0001] The invention relates to the field of circuits, in particular to an overcurrent protection circuit for an automobile motor controller. Background technique [0002] The core components of motor controllers for new energy vehicles are power devices such as MOSFETs or IGBTs, and their development trend is high current and high power. The most common form of damage to power devices is overcurrent damage, so accurate measurement of the output current of the motor controller and reliable overcurrent protection based on accurate measurement are particularly important to ensure the safe operation of the motor controller. [0003] At present, the current of the controller can be accurately measured by relying on high-precision current sensors, but the commonly used forms of over-current protection are over-current protection based on software detection or simple over-current protection based on over-saturation detection of integrated driver chips . [0004] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/20H02H3/08H02H3/06
Inventor 何勤冯霞陈宇李佳阳
Owner 杜丽红
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