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A method of voltage equalization in igbt series turn-on process

A clamping and control unit technology, applied in the field of voltage equalization control in the opening process

Active Publication Date: 2019-10-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a voltage equalization control method in the IGBT series turn-on process, which solves the deficiency of the existing voltage equalization scheme in the IGBT series turn-on process.

Method used

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  • A method of voltage equalization in igbt series turn-on process
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  • A method of voltage equalization in igbt series turn-on process

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Embodiment Construction

[0042] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation of the present application will be described in detail below by taking 3 IGBTs in series as an example and in conjunction with the accompanying drawings.

[0043] An example of an IGBT series experimental circuit embodiment involved in the present invention Figure 7 As shown, including the series IGBT group (1), the DC power supply U DC (5), freewheeling diode D (6), load inductance L (7), clamp unit (2), drive unit (3) and control unit (4). The control unit (4) is jointly implemented by an FPGA chip and a DSP chip, wherein the FPGA implements the function of a time extraction unit, and the DSP implements the functions of voltage equalization adjustment calculation and driving signal delay. The series IGBT group (1) is composed of three IGBTs connected in series, the first IGBT (IGBT 1 ) emitter E 1 with t...

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Abstract

The invention discloses a voltage-sharing method of an IGBT (insulated gate bipolar transistor) serial connection opening process, and belongs to the technical field of power electronics conversion. The voltage-sharing control method utilizes an opening process active clamping circuit configured to every IGBT, increases a simple isolation detecting circuit and detects voltage reduction moment of an IGBT set emitter. The FPGA is used for performing information treatment on a returning signal of the detecting circuit, extracting delay time numerical value of the opening process of every IGBT, and applying these time information to adjust the rising edge of the IGBT driving signal; after adjusting for many times, the voltage sharing of every IGBT is realized. The voltage-sharing control method proposed in the invention is applicable to a part of middle and high voltage power IGBT; the method is simple and easy to practice; besides, the method has the advantages of realizing the voltage-sharing speedability of the opening process of the IGBT serial connection while guaranteeing high stability.

Description

technical field [0001] The invention relates to a voltage equalization control method in the turn-on process of a power device IGBT applied in multiple series connections. It belongs to the technical field of power electronic conversion. Background technique [0002] In the field of medium and high voltage power conversion, IGBT is widely used due to its good working characteristics. However, as the working voltage increases, a single IGBT module cannot work alone, and it is often necessary to directly connect multiple IGBTs in series. [0003] If multiple IGBTs are directly connected in series, there is a voltage equalization problem between the IGBTs, and a certain voltage equalization scheme needs to be adopted to solve this problem. The working characteristics of IGBT determine that the voltage equalization problem in the turn-off process is more severe, so the existing voltage equalization schemes focus on solving the voltage equalization problem in the turn-off proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
Inventor 丁顺邢岩吴红飞胡海兵王钧
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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