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Replace IGBTs FF200R12KS4 with FF300R12KS

Discussion in 'General Electronics Discussion' started by Abdel_Rahman, Jul 19, 2016.

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  1. Abdel_Rahman

    Abdel_Rahman

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    Jul 19, 2016
    Hello
    We have an Induction Heater has two IGBTS, one of them was defected (FF200R12KS4)... In our Stock there is (FF300R12KS4), an experienced Technician says it is alternative to the defected part, but there is some differences in the data sheet, can any one advice us for using it or not?
    As my experience of electronics is not very good, What is the effect of these parameters?

    Parameter : FF200R12KS4 , FF300R12KS
    internal Gate Resistance : 2.5 , 1
    gate Charge : 2.1 , 1.0
    Input Capacitance : 13.0 , 20.0
    Reverse Transfer capacitance : 0.9 , 1.4
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,490
    2,832
    Jan 21, 2010
    How fast (I.e. Frequency) are you switching the load?
     
  3. Sunnysky

    Sunnysky

    483
    123
    Jul 15, 2016
    as @(*steve*) implied, switching speed or slew rate may be affected if driver does not have similar drop in resistor value to match drop in gate resistance. Most likely Ok. Thermal dynamics are unknown of complete circuit.

    However output will have corresponding improved lower Rce at 200amps since it is rated for same voltage drop with 300A.

    Switching speed can affect dynamic losses if not fast enough, but if fast enough, should run cooler. So complete design details are needed to confirm.

    The fact that you stated that it is "defective" ( not defected from country ;) ) implies the design may have overheated. So design details or operation history before/during failure are needed.
     
    Last edited: Jul 20, 2016
    Abdel_Rahman likes this.
  4. Abdel_Rahman

    Abdel_Rahman

    5
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    Jul 19, 2016
    Thank you for your reply.

    As it is an old machine, It has not any manuals, but similar machine has frequency (30-100 kHz).




    I am sorry, It is defected, but my English is somewhat "defective" :)
    It has been defected due to overloaded , after checking we found that there is a problem in the temperature sensor.
     
  5. Sunnysky

    Sunnysky

    483
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    Jul 15, 2016
    It is worth trying and compare device temps to ensure operating <<=85'C
     
  6. Abdel_Rahman

    Abdel_Rahman

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    Jul 19, 2016
    But I am afraid of trying, May trying affect the module??
     
  7. Sunnysky

    Sunnysky

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    Jul 15, 2016
    it depends. if in doubt, get help.
     
  8. Abdel_Rahman

    Abdel_Rahman

    5
    0
    Jul 19, 2016
    What do you mean by getting help
     
  9. Sunnysky

    Sunnysky

    483
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    Jul 15, 2016
    someone who knows how to replace correctly and test
     
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