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    Closed: Re: common mode feedback question

    - another assumption

    unless the op-amp is ac coupled with a capacitor - it will act down to DC ...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    Mica and thermal paste is not rated for more than 100V, so check the insulation to the heat-sink in case you knocked it and things got shorted out ...

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    Also check the...
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    Closed: Re: common mode feedback question

    - you are making a big assumption - based on what exactly ...?
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    how are you heatsinking the fets?
  5. Closed: Re: Input LC filter inductor is being shorted out

    To attenuate the switching noise of the converter the C would have to be on the left of the L, as it is the filter is filtering what is coming thru from the left - also isolating the converter...
  6. Closed: Re: Input LC filter inductor is being shorted out

    Actuarrrly, the Zo of that filter is 0.22 ohms - so 0.3 ohms is just a bit higher than critically damped ( i.e. less damped )
  7. Closed: Re: Input LC filter inductor is being shorted out

    Yup - mainly to stop ringing at 1uH, 20uF 35.5kHz ...
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    Closed: Re: 1.5kw DC to DC Boost Converter Circuit

    Yes

    output diodes are typically those diode on the output side of the transformer ...
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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 ...
  21. 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 ...
  22. 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 ... ...
  23. 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...
  24. 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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