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Comparing Power N-MOSFET IRF3205 and IGBT SKW30N60 for Negative Rail Switch in Ham Radio

fjpompeo 1815 9
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  • #1 17655587
    fjpompeo
    Level 11  
    Hi there, I want to install a protection system using a transistor like a switch in the negative rail of my ham radio power supply. But before need to know which is better a power N-MOSFET like IRF3205 or an IGBT like SKW30N60 or a more powerful one.

    Sorry, this is a GOOGLE's translation from Portuguese.

    73,

    Thank you very much from PU2PLL, Fernando, Brazil.
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  • #2 17655648
    ArturAVS
    Moderator  
    You are looking for protection what for?

    Only for power supply?
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  • #3 17657761
    fjpompeo
    Level 11  
    Not to protect the power supply, protect the load, or my radio, the semiconductor will stay in series with the negative output connector.
    73,
    PU2PLL
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  • #4 17658101
    ArturAVS
    Moderator  
    Hmmm to protect your radio or load connected to power supply?
    Over voltage protection? Or over current?
    Any schematic?
  • #5 17659464
    fjpompeo
    Level 11  
    Well, to protect my radio from overvoltage like a SCR crowbar does but instead burn a fuse it opens the negative rail. I know that SCR crowbar is a very safe topology but it can burn not only the fuse but power transistors, rectifiers the SCR and so on. Using an electronic switch circuit made of a N-channel Power MOSFET I can avoid all these possibilities and either protect my radio, easy and safe!

    After a little search on the net I found some logic N-channel Power MOSFET that switch on with just 5V

    73,

    Fernando - PU2PLL - Brazil
    Attachments:
  • #7 21169078
    jarek_lnx
    Level 43  
    IGBTs are used for high voltages. At 12 volts it makes no sense. There will be more than 2V of voltage drop on the IGBT.
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  • #9 21183472
    jarek_lnx
    Level 43  
    By what do you judge that it is better?
    What is the current and voltage in your circuit?
  • #10 21407178
    8829426
    Level 2  
    Hi Fernando,

    The SKW30N60 would be a better choice, as the IGBT will perform better at the higher voltages and currents required for this application. IRF3205 is good, but more suitable for lower voltages. https://www.lisleapex.com/product-skw30n60
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Topic summary

The discussion revolves around the selection of a semiconductor switch for a negative rail protection system in a ham radio power supply. The user, Fernando, seeks advice on whether to use a power N-MOSFET (IRF3205) or an IGBT (SKW30N60) for this application. Responses indicate that the SKW30N60 IGBT is preferred due to its suitability for high voltage applications, although it may not be optimal for 12V systems due to significant voltage drop. The user clarifies that the goal is to protect the radio from overvoltage, similar to a SCR crowbar, but with a more efficient electronic switch. Some participants share their experiences with both components, suggesting that the SKW30N60 is a better choice overall.
Summary generated by the language model.
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