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I can't understand you scheme of flyback! But as you know what happen in Uninterrupted Power Supplies (UPS).
You will use a 555 timer, a centered tap transformer 660 / 12V, two BJTs, a rectifier and a filter (It will be an expensive adn time taking process though).
i recomend the highly secret, but actually easy, "cascaded buck using sic mosfets"
It just uses one controller, but two high side fets, with an intermediary rail. You have a high side CST current sense at the upstream fet.
There is other posts on this forum about it...i will link them here for you, let me go and seek them..
..but then again, with just one stage (not cascading) your duty cycle will be 12/600....which is very low, so you could just use a low enough frequency till you get a decent length on time...big components , but do you care?
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posts #11 and #12 show the schem of the cascaded buck
okey. but how can i give gate signal to the switch(mosfet)?
Lot of flyback / pwm ICs are available, but Vcc to the ic is much lower than 600V. Usually in the range of 30-60V. So how to power the IC from the same input 600V?
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And one more doubt is i have to design DCM or CCM?
Which one is good for this application?
The total power is only 12 Watts (12V/1A).
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