A kind of igbt series voltage equalization control method

A voltage equalization control and control unit 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 increasing adjustment speed, improving adjustment efficiency, and improving stability

Active Publication Date: 2019-03-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

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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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  • A kind of igbt series voltage equalization control method
  • A kind of igbt series voltage equalization control method
  • A kind of igbt series voltage equalization 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 series voltage equalization control method, which belongs to the technical field of power electronic conversion. The voltage equalization control method uses the active clamping circuit equipped with each IGBT to extract the IGBT working voltage peak signal, and combines the comparison circuit to obtain the actual duration value of the voltage peak. Then use the detected time information, combined with the adjustment scheme optimized and designed according to the actual series working characteristics of IGBT, to adjust the edge of each IGBT drive signal, and realize the voltage equalization of each IGBT after multiple adjustments. The voltage equalization control method proposed by the invention is suitable for some medium and high voltage power IGBTs, and the adjustment method is designed according to the actual working characteristics of the IGBT. The method is simple and easy to implement, and can improve the rapidity of the voltage equalization of the IGBT series connection while ensuring high stability. .

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 Patents(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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