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Overvoltage protection system of power device and method adopting overvoltage protection system

A power device, overvoltage protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as limited discharge capacity, and achieve the effect of preventing overheating

Inactive Publication Date: 2012-02-15
SHENZHEN HANGSHENG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

General practice: When overvoltage protection occurs, the power device is directly turned off and the excess energy is discharged through a resistor, but the resistance of the resistor is generally tens of kiloohms, and its discharge capacity is limited

Method used

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  • Overvoltage protection system of power device and method adopting overvoltage protection system
  • Overvoltage protection system of power device and method adopting overvoltage protection system
  • Overvoltage protection system of power device and method adopting overvoltage protection system

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail:

[0023] Such as figure 1 with figure 2 As shown, a discharge circuit is added in parallel with the power device module 100, including: a switch tube Q7 and a discharge resistor R2.

[0024] The switch tube Q7 is driven by the enable signal of the power device after passing the reverse "AND" switch tube Q7 enable signal.

[0025] Under normal conditions: the power device control logic normally drives the power devices Q1 , Q2 , Q3 , Q4 , Q5 and Q6 in the power device module 100 under the control of the switch signal, and the power device enable signal is valid. When safety faults such as overvoltage, undervoltage, overcurrent, overtemperature, and overspeed occur, the enabling signal of the power device is invalid. After the reverse phase, the enabling signal of Q7 is "ANDed" to open the switch tube Q7 and pass through the discharge resistor. ...

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PUM

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Abstract

The invention relates to an overvoltage protection system of a power device and a method adopting the overvoltage protection system. The method adopting the overvoltage protection system comprises the following steps of: a detection step, a discharge step and a disconnection step, wherein in the detection step, a discharge control module is used for monitoring a working state of a power device module, and if a set discharge condition is reached, the discharge step is performed: in the discharge step, a discharge loop is closed by the discharge control module till the working state of the power device module returns to be normal; and in the disconnection step, the discharge loop is disconnected by the discharge control module.

Description

technical field [0001] The invention relates to a power device overvoltage protection system and a method thereof. Background technique [0002] The power device is the core device in the power electronic conversion, by controlling its on and off to achieve the purpose of controlling the output voltage, current and frequency. Since power devices account for 60% to 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. The usual protection methods include over-current, over-voltage, over-temperature, etc., among which over-current and over-temperature are cumulative quantities, and the power device itself also has a certain bearing capacity, which can be realized by conventional protection methods. However, power devices are very sensitive to voltage, and almost instantaneous overvoltage will burn out power devices. Especially in the application of vehicle-mounted...

Claims

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Application Information

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IPC IPC(8): H02H7/22
Inventor 刘爱华陈小江邱林朱刚阳熊本波
Owner SHENZHEN HANGSHENG ELECTRONICS