Overcurrent protection circuit system and method suitable for motor controller

A technology of overcurrent protection circuit and motor controller, which is applied in the direction of emergency protection circuit device, protection that responds to overcurrent, emergency protection device that automatically disconnects, etc., can solve problems such as inability to protect overcurrent, and achieve The effect of solving the problem of overcurrent protection

Inactive Publication Date: 2020-02-28
SHANGHAI LECKON ELECTRICAL TECH CO LTD
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  • Claims
  • Application Information

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The patent does not play the role of overcurrent protection

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  • Overcurrent protection circuit system and method suitable for motor controller
  • Overcurrent protection circuit system and method suitable for motor controller
  • Overcurrent protection circuit system and method suitable for motor controller

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0028] Such as figure 1 , figure 2 As shown, according to the present invention, an overcurrent protection circuit system suitable for motor controllers includes: converting to voltage signal module: using U / V phase current sensor sampling to convert the current signal into a voltage signal to obtain the voltage to be calculated Information; W-phase voltage value calculation module: according to the voltage information to be calculated, the U / V phase current sensor and the three-phase current characte...

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Abstract

The invention provides an overcurrent protection circuit system and method suitable for a motor controller. The overcurrent protection circuit system includes: a voltage signal conversion module for converting a current signal into a voltage signal by using U / V-phase current sensor sampling, and obtaining voltage information to be calculated; a W-phase voltage value calculation module for calculating, according to the voltage information to be calculated, a W-phase voltage value by a hardware circuit with the U / V-phase current sensor and three-phase current characteristics, and obtaining W-phase to-be-compared voltage information; a threshold voltage comparison module for comparing the W-phase to-be-compared voltage information with the threshold voltage by a voltage comparator to obtain MCU determination information; and an MCU determination module for outputting the MCU determination information to a MCU for determination, and obtaining the MCU determination result information. The system and method can quickly respond to overcurrent protection. The circuit and software designed by the present invention complement each other to doubly protect the overcurrent. The system and method solve the overcurrent protection problem without an extra current sensor.

Description

technical field [0001] The invention relates to the field of overcurrent protection circuits, in particular to an overcurrent protection circuit system and method suitable for motor controllers. Background technique [0002] The three-phase current sampling circuit of the traditional pure electric vehicle motor controller is completed by using three current sensors. After considering the cost, one sensor is saved, and the other phase current is obtained using a software algorithm. However, in the application of the whole vehicle, this strategy of using algorithms to calculate the current is not very reliable in overcurrent protection. In order to solve this problem, the present invention uses a hardware circuit to calculate the current of another phase without adding a current sensor. In the overcurrent protection, the response speed of this circuit is better than that of a software algorithm. The actual application proves that this invention can interact with software. As ...

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Application Information

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IPC IPC(8): H02H7/085H02H3/08
CPCH02H3/083H02H7/0854
Inventor鲁克银杨超韩黎文丰林
OwnerSHANGHAI LECKON ELECTRICAL TECH CO LTD