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IGBT (insulated gate bipolar transistor) series connection voltage balancing control method

A control unit and voltage technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as control speed requirements, and achieve the effects of improving regulation speed, regulation efficiency, and stability.

Active Publication Date: 2017-05-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution requires the switch to complete the adjustment process instantaneously, which has extremely high requirements on the control speed.

Method used

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  • IGBT (insulated gate bipolar transistor) series connection voltage balancing control method
  • IGBT (insulated gate bipolar transistor) series connection voltage balancing control method
  • IGBT (insulated gate bipolar transistor) series connection voltage balancing control method

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Embodiment Construction

[0043] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings.

[0044] An example of an IGBT series experimental circuit embodiment involved in the present invention Figure 4 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 the second IGBT (IGBT 2 ) collector C 2 co...

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Abstract

The invention discloses an IGBT (insulated gate bipolar transistor) series connection voltage balancing control method and belongs to the technical field of power electronic conversion. The method includes: utilizing an active clamping circuit equipped for each IGBT to extract working voltage spike signals of each IGBT; combining with a comparison circuit to acquire voltage spike actual lasting time value; utilizing time information acquired by detection, combining with an adjusting scheme designed in an optimized manner according to actual series connection working characteristics of each IGBT to adjust driving signal edge of each IGBT, and realizing voltage balancing of the IGBTs after adjusting for several times. The voltage balancing control method is suitable for part of mesohigh-power IGBTs, and the adjusting mode is designed according to actual working characteristics of the IGBTs, so that the method is simple and easy to realize, and quickness of series connection voltage balancing of the IGBTs can be improved while high stability is guaranteed.

Description

technical field [0001] The invention relates to a voltage equalization control method for 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] Using multiple IGBTs in direct series structure, there is an IGBT voltage equalization problem. To solve this problem, there are generally the following three solutions: The first solution is to add an absorption circuit. This is the simplest method of voltage equalization, but the effect is also the worst. . In situations where the voltage is high, the frequency is high, and the rate of change of voltage and current is large, this scheme will generate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088
CPCH02M1/088H02M1/0006
Inventor 丁顺邢岩吴红飞胡海兵王钧
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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