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motor protection system

A technology for motor protection and protection circuits, applied in control systems, motor control, emergency protection circuit devices, etc., can solve problems such as long response time of overcurrent protection

Active Publication Date: 2019-12-06
SHENZHEN BYD DAIMLER NEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to provide a motor protection system for the long response time of the traditional electric vehicle overcurrent protection

Method used

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Embodiment Construction

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the invention is for the purpose of describing specific embodiments only, and is not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the ...

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Abstract

The invention relates to a motor protection system. The motor protection system is used for controlling a motor driving circuit; the motor driving circuit is controlled by a processor; the motor protection system comprises a monitoring circuit and a protection circuit; the monitoring circuit is connected with the protection circuit; the protection circuit is also connected with the motor driving circuit and the processor separately; the monitoring circuit is used for monitoring the current of the motor and transmitting an overcurrent signal to the protection circuit when the current is greater than an overcurrent threshold value; the execution speed of the protection circuit is greater than that of the processor; after the protection circuit receives the overcurrent signal, control of the motor driving circuit by the processor is stopped; in addition, the protection circuit can lower the current by controlling the motor driving circuit; when an overcurrent condition occurs, the motor protection system switches the control right on the motor driving circuit from the processor to the protection circuit; and in addition, the execution speed of the protection circuit is greater than that of the processor, so that the overcurrent protection response time can be shortened.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a motor protection system. Background technique [0002] In the electric vehicle drive system, the essence of motor control is to control the current flowing through the motor. Due to driving conditions, hardware circuit influence, hardware sampling accuracy, software control and other factors, the current flowing through the motor may be too high. In traditional electric vehicles, overcurrent protection is usually implemented through software. However, the detection and response time of the software to the fault is longer, usually above 100μs, and within 100μs of the overcurrent occurrence, the current of the motor can increase to about 200A, which is enough to make the already high current continue to increase and reach a Dangerous current range, once the power device is controlled in this dangerous current range, it is very likely to damage the power device. Cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/085H02P29/024
CPCH02H7/0856H02P29/027
Inventor 胡凯张明埃瑞克·哈特曼
Owner SHENZHEN BYD DAIMLER NEW TECH CO LTD