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Protection circuit and protection method of diode-clamped three-level converter

A diode clamping and protection circuit technology, which is applied to emergency protection circuit devices, AC power input conversion to DC power output, electrical components, etc., can solve the difficulty in ensuring the shutdown sequence of diode clamping three-level converters, etc. question

Inactive Publication Date: 2020-04-17
SUZHOU WEICHUANG ELECTRICAL EQUIP TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

If all the IGBT driving signals are turned off at the same time by hardware, it is difficult to guarantee the turn-off sequence requirements of the diode-clamped three-level converter

Method used

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  • Protection circuit and protection method of diode-clamped three-level converter
  • Protection circuit and protection method of diode-clamped three-level converter
  • Protection circuit and protection method of diode-clamped three-level converter

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Embodiment Construction

[0049]In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

[0050] figure 1 It is a schematic structural diagram of a protection circuit of a converter in an embodiment. In the embodiment of the present invention, refer to figure 1 , the embodiment of the present application provides a protection circuit for a diode-clamped three-level converter, the protection circuit comprising:

[0051] An o...

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Abstract

The invention relates to a protection circuit and a protection method for a diode-clamped three-level converter. The protection circuit comprises an overcurrent detection circuit which is used for detecting the output current of the converter, and outputting an overcurrent signal according to the output current; a desaturation fault detection circuit which is used for detecting whether the insulated gate bipolar transistor in the protection circuit has a desaturation fault or not, and outputting a fault signal if the desaturation fault occurs; a hardware wave locking circuit which is used forlocking all the driving signal locking signals and outputting locking signals for locking all the driving signals according to the overcurrent signals and the fault signals; and a switching sequence management circuit which is used for controlling the turn-off of each insulated gate bipolar transistor in the protection circuit according to the blocking signal and a preset turn-off sequence, and controlling the turn-on and turn-off of each insulated gate bipolar transistor according to the driving signal and the preset turn-on and turn-off sequence. According to the protection circuit, when thefault signal is detected, the turn-off requirement of the diode-clamped three-level converter is met, the fault signal is processed in time, and the adverse effect on the converter caused by delay processing is avoided.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a protection circuit and protection method for a diode-clamped three-level converter. Background technique [0002] With the mature development of diode-clamped three-level converter control technology, its application in medium-voltage frequency converter products is becoming more and more extensive. Diode-clamped three-level converter, there are four IGBTs (insulated gate bipolar transistors) on each bridge arm of the converter, which are connected to the midpoint of the bus capacitor through two clamping diodes, in order to realize the converter output three Level state, diode-clamped three-level converters must control the turn-on and turn-off of each IGBT in a strictly specified order. The switching logic of the IGBT is realized by software by setting the dead zone and controlling the switching sequence when the converter is running normally. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/122H02M7/487H02M1/38
CPCH02H7/1227H02H7/122H02M7/487H02M1/38H02M1/0009
Inventor 骆鹏刘鹏越
Owner SUZHOU WEICHUANG ELECTRICAL EQUIP TECH
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