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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    yes, a snubber is an R in series with a cap.
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    Start with 470pF 1kV cap and 47 ohm 3 watt R across each fet, D-S

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    and, 330pF, 1kV cap and 680 ohm 3W across output diodes ...
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    Closed: Re: Flyback Airgap Doubts?

    you recall incorrectly ... tuning, as such, was only ever required if you wished to get close to minimum current ripple on the coupled inductor AND transformer variants - it is possible to...
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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 ...
  13. 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 ...
  14. 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 ... ...
  15. 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...
  16. 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...
  21. 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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