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    Closed: Re: Flyback Airgap Doubts?

    Isolated PFC Cuk @ 3kW is only for the power electronics engineer with 15+ years of solid experience ...
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    Closed: Re: Non-Invasive High Voltage Coupling?

    split core CT will easily go over any line, also there is a device that slides on a line to measure joint resistance ....
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    Closed: Re: Flyback Airgap Doubts?

    talking crap unfortunately... - the gap length is not independent of gap area - where he gets this off the cuff nonsense is a mystery - perhaps he has never designed a flyback ...?
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    Closed: Re: Flyback Airgap Doubts?

    Or - you can increase the pri turns to 60 and double the gap - and hey presto - DCM ... and a decent flyback voltage ( 136V ) and a 100V o/p diode will do ...

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    I...
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    Closed: Re: Flyback Airgap Doubts?

    60V is too low for the o/p diode with your existing Tx, needs to be 150V at least - see posts above ...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    It depends on the wiring inductance ( layout ) and de-coupling on the power stage ... and the leakage in the Tx, and the o/p choke, and the diodes, and any snubbers used, and how good the...
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    Closed: Re: Flyback Airgap Doubts?

    make Rsns smaller for more power - if the snubber diode is getting hot the transformer has too much leakage inductance ... also the Fr07 is a bit too slow ( trr)

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    ...
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    Closed: PWRTRNX . com power electronics design

    email us for professional power electronics and control system design, EMC troubleshooting, thermal design and similar

    1W - 250kW
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    Closed: Re: Flyback Airgap Doubts?

    if there is a current limit on the primary - this will limit max power out ...
  10. Closed: Re: The "cheap, quick and easy" way to do high power SMPS's?

    the beauty of the two switch - two diode - forward converter, is that it is very easy to get going at full power, near 50% duty cycle a little bit of slope comp is useful for maximum stability ...
  11. Closed: Re: The "cheap, quick and easy" way to do high power SMPS's?

    having 4 oscillators, 90deg apart looks like a good idea ( single 555 osc with 4 connections to local boards ) - linking the comp pins would be easy - job done ... ...
  12. Closed: Re: The "cheap, quick and easy" way to do high power SMPS's?

    the circuit appears to be current mode already - just need to link the comp pins - for all stages to do the same current ...

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    if you synch the oscillators too - then...
  13. Closed: Re: The "cheap, quick and easy" way to do high power SMPS's?

    and if it's built symmetrically - the thermals will be even-ish too - but ...!

    how are you doing the volt feedback on each one ...? if one is a few mV higher than the other it will do al...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    This is the trouble with not posting a full & accurate schematic - because with full information the fixes can be posted all at the same time - i.e. results a lot quicker.

    A good idea to have...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    dead time or discharge resistor should be about 5% of the timing resistor, try 47 ohm, 100 ohm - and a large soft start cap ... and a 40W light bulb or better still 2 x 40W in series for a...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    OK, so, 50kHz = 170mT pk, 20kHz = 425mT - so hopefully your freq is 50kHz, and the dead time is 1uS at least ...?
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    What is the core size of the Tx? - the blocking cap ( which would be quite large in this case ) stops DC current saturating the Tx - if you don't have a blocking cap then you need to run...
  18. Closed: Re: how to boost microvolts to higher voltages?

    are you talking amplifying a signal using a separate power source - or - do you only have uV and want to convert it to mV ... ?
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    Closed: Re: How to wind toroidal coils?

    that's what tape is for ...

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    e.g. kapton, polyester ...
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    Closed: Re: How to wind toroidal coils?

    optimal solution is either litz or tape type copper - e.g. 0.1mm thick ribbon - insulated, 6mm wide - this has more "skin" to carry AC currents ...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    have you got twice the turns on the pri for 24V?, also an 100W light buld is a bad idea unless you have a slow soft start - or a soft 24V supply - as the cold resistance is only a few ohms and...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    Yes - but you are measuring the high side fet gate with respect to gnd - so you see Vrail ( 24V ) + V boobstrap ( 15V ) = 39V

    to see the actual gate drive volts on the high side you...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    Are you using a DC blocking cap and the same transformer? if no cap and same transformer then the magnetising current will peak up for 24V and kill your fets - what proof have you that you are...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    best to show your ckt ...

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    at 24 volt you may be killing your fets with over current ...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    use a 15V reg to power the IR2113 ....
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