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Active over-current protection method and active over-current protection device of power device

A technology of overcurrent protection and power devices, applied in the direction of electrical components, motor control, control systems, etc., can solve the problems of high current, high torque, burning power devices, etc., and achieve the effect of preventing overheating

Inactive Publication Date: 2014-11-26
SHENZHEN HANGSHENG ELECTRONICS
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the motor is locked and started at low speed, there will be high torque and high current, which will cause the power device to heat up for a long time, and the extreme case may burn the power device

Method used

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  • Active over-current protection method and active over-current protection device of power device
  • Active over-current protection method and active over-current protection device of power device

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] as attached figure 1 As shown, the present invention provides a maximum torque control strategy. When the number of executions is 0, the maximum torque will enter the decay mode, and the torque output will be limited when the motor rotates at a low speed, so as to prevent the power device from being in a high current working state for a long time, and achieve The purpose of preventing overheating of power devices. Among them, Tmax: the maximum torque that the motor is allowed to output; Tmin: the minimum torque that the motor is allowed to output; Time: the number of times to execute the maximum torque; Factor: the weakening factor of the maximum torque; Δt: the execution time of the maximum torque. The specific implementation is to obtain the current maximum torque execution times by querying the speed-time, execute in a decreasing ma...

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Abstract

The invention provides an active over-current protection method of a power device. The method comprises the steps as follows: obtaining rotation speed of a motor, and judging whether the rotation speed of the motor is lower than a threshold or not; and if the rotation speed of the motor is lower than the threshold, obtaining an attenuation factor by inquiring the correspondence relationship of the number of execution times and a corresponding attenuation factor at the current rotation speed, so as to reset the maximum output torque Tmax and the minimum output torque Tmin. According to the active over-current protection method of the power device, disclosed by the invention, torque output is limited when the motor rotates at low speed, so that the power device is prevented from working in a heavy-current state for a long time, and further, the purpose of preventing the power device from over-temperature is achieved. In addition, the method is economical and reliable.

Description

technical field [0001] The invention relates to an overcurrent protection method for a power device, in particular to an active overcurrent protection method for a power device. Background technique [0002] The power device is the core device in the power electronic conversion, and the purpose of controlling the output voltage, current and frequency is achieved by controlling its on and off. Since power devices account for 60%-80% of the cost of the entire power electronic converter, the success or failure of its protection is directly related to the success or failure of the entire system. Common protection methods include over-current protection, over-voltage protection, and over-temperature protection. [0003] Among them, there are three general methods of overcurrent protection: 1. Hardware overcurrent protection. The overcurrent signal is output through the current detection circuit to turn off the power device to achieve the purpose of overcurrent protection; 2. So...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P29/00H02P29/032
Inventor 刘爱华陈小江
Owner SHENZHEN HANGSHENG ELECTRONICS
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