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Short circuit protection system and safe closing control method of three-level converter power tube

A short-circuit protection and power tube technology, which is applied in the protection of overcurrent response, emergency protection circuit devices, electrical components, etc., can solve the problems of ineffective protection of power switching devices and damage to power switching devices.

Active Publication Date: 2014-04-02
CHANGZHOU LIANLI AUTOMATION TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, when an overcurrent or short circuit fault occurs in the three-level converter circuit, the control system adopts the method of blocking all driving signals at the same time. Cause damage to other power switching devices

Method used

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  • Short circuit protection system and safe closing control method of three-level converter power tube
  • Short circuit protection system and safe closing control method of three-level converter power tube
  • Short circuit protection system and safe closing control method of three-level converter power tube

Examples

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Effect test

no. 1 example

[0037] see figure 2 , 3 , 4, the short-circuit protection system of three-level converter power tube, this protection system comprises computer controller 103, the first signal isolation converter 104 that will enter the optical signal of computer controller 103 conversion into electric signal, computer controller The output electrical signal is converted into the second signal isolation converter 105 of optical signal, and the overcurrent and short circuit of the three-level converter are detected in real time and the detected signal is transmitted to the computer controller through the first signal isolation converter The drive protection circuit, the computer controller 103 receives the fault signal and transmits the signal to the drive protection circuit through the second signal isolation converter 105, and the drive protection circuit controls the power tube in the outer tube area of ​​the three-level converter to be closed first, and then closed Inner tube area power ...

no. 2 example

[0042] see Figure 5 , 67. The drive protection circuit can also be supplemented by a single-chip microcomputer with certain peripheral circuit chips; such as the single-chip microcomputer 200, the over-current and short-circuit detection unit 201 for detecting the over-current and short-circuit of the three-level converter power tube, and three The drive output unit 202, the drive signal receiving unit 203, and the fault signal sending unit 204 connected to the control pole of the power tube in the level converter; wherein the single-chip microcomputer replaces the signal delay unit, soft-off start unit, drive The functions of the controller unit, the reset unit and the power tube temperature detection and alarm unit can all be realized through the programming of the single-chip microcomputer, so that when the over-current short-circuit detection unit detects any power tube over-current or short-circuit, it will report to the single-chip microcomputer Send information, the s...

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Abstract

The invention relates to a short circuit protection system and a safe closing control method of a three-level converter power tube. The short circuit protection system comprises a computer controller, two signal isolation converters, and a drive protective circuit, wherein a first signal isolation converter is used for converting optical signals entering the computer controller into electric signals, a second signal isolation converter is used for converting electric signals output by the computer controller into optical signals, the drive protective circuit is used for protecting the three-level converter power tube when a three-level converter power tube is overcurrent and is in short circuit and controls that a power tube in an outer tube area of a three-level converter is firstly closed and then a power tube in an inner tube area of the three-level converter is secondly closed, thereby guaranteeing that a level state of bridge arm output during processing a state of a drive pulse locked due to malfunction interrupt still obeys a P-O-N or N-O-P transition principle; in addition, the power tube generating the overcurrent or short circuit situation is effectively protected, and the breakage on the power tube in a process of closing all power tube driving signals is prevented.

Description

technical field [0001] The invention belongs to the technical field of short-circuit protection of switching devices in power electronic power converters, and in particular relates to a short-circuit protection system and a safety shutdown control method of a power tube of a three-level converter. Background technique [0002] The output voltage of a three-level power conversion circuit (including a three-level inverter, a three-level rectifier, and other three-level switching converters) contains three levels, and the voltage that each switching tube bears is only the corresponding two levels. Half of the switch tube of the converter can effectively reduce the harmonic content, improve the quality of the output waveform, and reduce the current ripple or torque ripple. Applications. [0003] Each switching tube in the three-level power conversion circuit must follow a certain sequence to arrange the switching action. Take the diode neutral-point clamped three-level three-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/10H02H3/08
Inventor 何礼高陈鑫兵杜恩利蔡准徐兵兵徐华胡磊高菊玲李刚
Owner CHANGZHOU LIANLI AUTOMATION TECH
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