Dear samhtcandroid
Hi
There are some tables and application notes about how to select core for or desired power and frequency , did you search for them ever?
Best Wishes
Goldsmith
Hi again
Did you think that you can simply add two switch and then build a push pull converter ? of course not . you'll need a dead time creator and a PWM modulator and a compensation network and ......... in the other hand , you'll need a driver IC , and for push pull , SG3526N can be good choice .
Anywhere : the winding seems good . ( don't forget that points that are symbols of start of the winding , are pretty important , and in your picture according to the winding , those are correct )
Best Luck
Goldsmith
---------- Post added at 16:37 ---------- Previous post was at 16:36 ----------
BTW : for secondary , the start point isn't correct
See the FvM's post , he correctly said , what you should do to improve it .May i know which is the start point? Do you mean that the centre is tapped wrong at
the centre?
for how much power and what frequency ?Any specific CORE that you would recommend
it depends on th frequency of operation and current and voltage .2 N-channel Mosfet for switching
as i told you at past , try to use a simple SG3526N . ( it is pretty good ) .3) PWM controller.(still searching for suitable ones)
of course it is suitable . you can use a voltage divider ( consists two resistor ) and then use a TL431 ( variable zener diode ) when the reference voltage be about 2.5 volts , it will conduct . thus you can use a simple opto coupler in series with this zener . simply . vout = 2.5(1+(R1/R2)) .Is a simple opto coupler and zener diode suitable?
Of course not ! the SG3526N , has two out put . it designed for this aim .2) I am using 2 N channel mosfet for switching, that means i need 2 driver gate?
Hi Samuel
of course it is suitable . you can use a voltage divider ( consists two resistor ) and then use a TL431 ( variable zener diode ) when the reference voltage be about 2.5 volts , it will conduct . thus you can use a simple opto coupler in series with this zener . simply . vout = 2.5(1+(R1/R2)) .
Of course not ! the SG3526N , has two out put . it designed for this aim .
And about your core , it seems good , but don't forget that this core should be able to handle this power .
By the way : did you decided about switching frequency ?
And an advice : if it is your first time , with SMPS design , i suggest you , to start with lower voltages , and then decide for 350 volts . ( because this voltage is DC , it will be more dangerous than AC , so , be careful . )
Good luck
Goldsmith
I know , exactly , what you mean ! but don't forget that each PN junction has a capacitor . for mosfet we have some capacitors , but most important one is GS capacitor . at transient time it is short circuit because it is discharge , and you should give it high value of inrush current . after the time that your capacitor is full of charge , you have a voltage across the GS junction , so your mosfet can be turn on . hence the drive current is most important parameter in each mosfet . don't forget that when you increase the frequency , naturally , you should increase inrush current , or select a mosfet with lower CISS .4) but i come across some articles that says MOSFET is Volt driver, but why the concern over the riving current?
Thank you very for the advice.
Reference to the
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The "X" axis represents Magnetic Field Intensity (Coercive Force) which is proportional to the Ampere·Turns.
The "Y" axis represents Flux Density which is proportional to the Core Area and the Volt·Seconds applied to the primary winding when active.
I cant seem to locate this BH curves from CORE specification.
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