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  1. #1
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    Flow of Current in IGBT

    Hi Guys
    I want to know about the operating of IGBT. Does it is same as i mentioned in diagram or this will not be the scenario
    IGBT # is 10-FY12NMA160SH01-M820F18

    Click image for larger version. 

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    if not then what would be the flow?

    Thanks and best regards

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    Re: Flow of Current in IGBT

    current path through IGBTs looks ok



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    Re: Flow of Current in IGBT

    OK fine. now the scenario is that i am reverse engineering an circuit, its circuit is something like
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    The portion which i have marked Red are short. Now how does this works? any idea



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    Re: Flow of Current in IGBT

    Hi,

    "Short" in the schematic or in the real circuit?

    * in the schematic: Only where a dot is, there is a connection. Where no dot is, there is no connection. Thus within your red box there are two independent output signals.
    * in the real circuit: How did you measure it? What measurement tool? With load connected?

    Klaus
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    Re: Flow of Current in IGBT

    Do you understand MNPC topology? Do you understand the purpose of split output feature? https://www.vincotech.com/cn/news-cn...fficiency.html

    https://www.vincotech.com/fileadmin/..._FD-Rev_02.pdf

    What kind of circuit are you evaluating? I'd expect the split outputs bridged by small inductors outside the module, see datasheet figure 10, in so far they may appear as shorted. The module may be also used in classical MNPC configuration by shorting the split outputs.

    The current path sketched in post #1 seems to involve a misunderstanding of the topology, I think. The load is not connected between the split outputs.



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    Re: Flow of Current in IGBT

    hi
    in the real circuit: How did you measure it? What measurement tool? With load connected?
    I can see clearly from the PCB that these points are short.
    Click image for larger version. 

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    Do you understand MNPC topology? Do you understand the purpose of split output feature?
    No

    What kind of circuit are you evaluating?
    Basically i have a damaged 50KW Three Phase On-Grid Inverter and just seeing what is the circuit and how does it works for my knowledge.
    I have seen all the circuit and understand it but this portion i am unable to understand.



    Thanks and best regards



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    Re: Flow of Current in IGBT

    Hi,

    I can see clearly from the PCB that these points are short.
    I canīt see nothing special. Itīs like the schematic shows. And I think itīs correct thay it is done. Nothing to worry about.

    But I canīt see whatīs worrying you. Your informations are too vague.

    Klaus
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    Re: Flow of Current in IGBT

    I can see clearly from the PCB that these points are short.
    O.K., so the last point in my interpretation applies, they are not using the split output feature, just basic T-circuit (M)NPC https://www.vincotech.com/products/b...bout-mnpc.html

    Here's an explanation of T-type NPC switching pattern in 3-phase inverter https://www.fujielectric.com/product...Converter).pdf



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