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  1. Replies
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    Fix the problem with just letting a quarter of...

    Fix the problem with just letting a quarter of primary winding going through the yellow current trafo
    now the protection board working perfectly and there's now heating on current traso as well
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    I will check the gate voltage of the fets as soon...

    I will check the gate voltage of the fets as soon as I get home

    about the current trafo
    The core gets really hot (only when smps is under load) without any secondary winding on it ( just the...
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    So I replace the gate resistors with 15 ohms...

    So I replace the gate resistors with 15 ohms resistors for each fets and now the fets reaches to 50 degrees at 600W load
    now there's a problem with current transformer for protection board and it's...
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    thanks man I get it now I appriciate your helps

    thanks man
    I get it now
    I appriciate your helps
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    thanks a lot if it's possible could you tell me...

    thanks a lot
    if it's possible could you tell me how did you get 10 ohms from the formula?
    I mean what values did you use from the datasheet
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    should I take 150 or 35 as T on??

    should I take 150 or 35 as T on??
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    @dear silvio could you help me calculate the...

    @dear silvio

    could you help me calculate the right gate resistor for mosfets
    I don't know 2 things
    first one what are the correct values for rise time and fall time of IR2110?
    6792

    second...
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    thank you for your tips I used 2 seperate 6...

    thank you for your tips

    I used 2 seperate 6 ohms resistors for 2 parallel mosfets and this lower down the amount of sparks
    I still need to use some snubbers
    I will calculate the values using...
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    I also use one 2.7 ohms resistor for every two...

    I also use one 2.7 ohms resistor for every two mosfets parallel in every channel
    should I use a higher resistor value or use a seperate resistor for each one of the 2 parallel mosfets??
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    Thanks Dear Silvio for your helps So it turned...

    Thanks Dear Silvio for your helps

    So it turned out that my multi meter was reading incorrectly (Broken) and the temp on the back metal part of mosfets never reach 50 degrees with a low value...
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    as you said I checked the output capacitance of...

    as you said I checked the output capacitance of my mosfets and I get about 8.7 nf
    I think they are good to go
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    I use two IRF1404 in parallel at each channel at...

    I use two IRF1404 in parallel at each channel
    at 500W in the output there should be around 40A in input going through the masfets!!!!

    I used snubber as well to controll those sparks and I did...
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    Hi again I manage to build a full bridge...

    Hi again

    I manage to build a full bridge inverter to drive my amplifier in the car
    everything is good except mosfet's overheating under load
    here's a picture of primary transformer without any...
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    thanks man

    thanks man
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    No i meant the voltage drop on alternator as...

    No i meant the voltage drop on alternator as we're drawing 70A from it
    I know about the drops from alternator to the amp
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    @Silvio I manage to build a 1kw converter with...

    @Silvio

    I manage to build a 1kw converter with full bridge topology
    I need to know what is the lowest voltage I should design the converter for when car is running?
    as I measure the voltage...
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    the 500W is before the transformer saturation and...

    the 500W is before the transformer saturation and is that situation all mosfets heat normal

    Full brige does not suffer from staircase saturation and gives some forgiveness on how primary windings...
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    the last video I uploaded was from the gates of...

    the last video I uploaded was from the gates of mosfets at the same time
    when I connect the load one side of primary's mosfets gate voltage drops and that is why it's stone cold and the other sides...
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    Sorry about the previous video, there was a...

    Sorry about the previous video, there was a ground issue in the measurements
    here's the right one :


    https://youtu.be/1-aT29eX7GA

    Turn's out that the voltage pulses from one channel of the...
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    Here's the PCB that I'm using for this project:

    Here's the PCB that I'm using for this project:
  21. Replies
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    @ Dear Silvio Here's a video clip from the...

    @ Dear Silvio

    Here's a video clip from the Gate of mosfets at the same time according to Negative :

    https://youtu.be/na7jK3TaPWM

    Here's some shots of the transformer primaries at the same...
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    Here you go This pictures are from the side of...

    Here you go

    This pictures are from the side of primary that the mosfets connected to it gets really hot with high load :
    Without any load :
    6707
    With 37.5 Ohms load :
    6708

    The other side of...
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    @Dear Silvio So I place a gap in the core legs...

    @Dear Silvio

    So I place a gap in the core legs and it did help a bit but not a lot (I could get about 50W more in the output) and transformer still makes a click sound and voltage at output drops...
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    @dear Silvio Doesn't saturation only ralated to...

    @dear Silvio
    Doesn't saturation only ralated to flux density?
    Does it mater to have more or less turns on primary as long as you keep flux density the same by changing the frequency??
    I did as...
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    can I go lower than 20Khz in frequency ao that I...

    can I go lower than 20Khz in frequency ao that I could go with 4+4 turns in primary??
    doesn't this effect amplifier or produce any noise on it
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