Diode neutral point clamped three-level inverter current limiting control method and related circuit thereof

A technology of three-level inverters and diodes, applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, can solve problems such as large voltage stress and failure, and achieve Reduce the voltage stress and avoid the effect of excessive voltage stress

Active Publication Date: 2013-01-09
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the current is limited, the two inner switch tubes (hereinafter referred to as the inner tube) Q2 and Q3 are switched from the off state to the on state at the same time. At this time, the outer switch tube (hereinafter referre

Method used

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  • Diode neutral point clamped three-level inverter current limiting control method and related circuit thereof
  • Diode neutral point clamped three-level inverter current limiting control method and related circuit thereof
  • Diode neutral point clamped three-level inverter current limiting control method and related circuit thereof

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Embodiment Construction

[0040] The embodiment of the present application provides a current-limiting control method for a diode mid-point clamped three-level inverter. Please refer to figure 1 , the diode mid-point clamped three-level inverter circuit includes four switching tubes connected in series, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4. arm, wherein two series-connected diodes D5 and D6 are connected in parallel at both ends of the series branch formed by the two inner transistors Q2 and Q3, and a diode is anti-parallel-connected at both ends of each switch tube.

[0041] The current-limiting control method of the diode mid-point clamp type three-level inverter provided by this application collects the current in the switch tube and judges the magnitude relationship between the collected current in the switch tube and the current setting value, Thus, an overcurrent detection signal is generated. Specifically, when t...

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Abstract

The invention discloses a diode neutral point clamped three-level inverter current limiting control method and a related circuit thereof. The diode neutral point clamped three-level inverter current limiting control method comprises specific steps as follows: when the current in switching tubes is lowered to be not bigger than a first current preset value, the related circuit drives one of the switching tubes at the inner side of a bridge arm to be switched on; after a first delay time, another one of the switching tubes at the inner side is driven to be switched on; after a second delay time, one of the switching tubes at the inner side is controlled to be switched off, and another one of the switching tubes is controlled to be normally switched on; and all the switching tubes are controlled to be switched on or switched off according to the control time sequence of the diode neutral point clamped three-level inversion circuit. In such control mode, the switching sequence of the switching tubes in the diode neutral point clamped three-level inversion circuit can be controlled, thereby reducing the voltage stress of the switching tubes and ensuring that the voltage stress of the switching tubes can not exceed the standard even if the limited current is exceeded.

Description

technical field [0001] The present application relates to the technical field of inverter current limiting, in particular to a current limiting control method and related circuits of a diode mid-point clamped three-level inverter. Background technique [0002] The inverter is used to convert DC power into AC power, and its circuit mainly includes an inverter bridge, a control logic circuit and a filter circuit. [0003] See figure 1 , shows a schematic diagram of the main circuit of a typical diode neutral-point clamped three-level inverter, which mainly includes four switching tubes: the first switching tube Q1, the second switching tube Q2, and the third switching tube Q3 , the fourth switch tube Q4, and diodes D5 and D6, and each switch tube has diodes connected in antiparallel at both ends, as figure 1 The diodes D1, D2, D3, and D4 are shown; among them, the four switching tubes are controlled by four driving signals to turn on and off, and the switching tubes Q1 and Q...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M7/487
CPCH02H7/122H02M1/32H02M7/487H02H9/02
Inventor 刘克雷王富洲吕艺行
Owner HUAWEI DIGITAL POWER TECH CO LTD
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