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Registered Member #3805
Joined: Sat Apr 02 2011, 09:06PM
Location: Jakarta, Indonesia
Posts: 14
hi, sorry for my absence, college stuffs, sigh tomorrow i'll have a spare time, maybe for shop some components again, yeah btw, if i use a resistor-look at the attachment-to substitute the power resistor, where could i actually find its wattage? and i thought to stick it to the heatsink too, should i?
Since ZVS cannot simulated (if u know how pls tell me) then, i try to simulate boost converter to compare NMOS(IRFP250) with NPN (TIP3055) using LTSpice and it shows NPN rise voltage faster than NMOS, (the blue line is NPN, and the green is NMOS) is the same happen to zvs if i change NMOS with NPN or not?
Registered Member #3805
Joined: Sat Apr 02 2011, 09:06PM
Location: Jakarta, Indonesia
Posts: 14
after reading some explanations about zvs, i thought that it'll not work if i use npn, because npn trigered by current, but zvs's mosfets are conducting because there's voltage difference, correct me please
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Rustycan wrote ...
after reading some explanations about zvs, i thought that it'll not work if i use npn, because npn trigered by current, but zvs's mosfets are conducting because there's voltage difference, correct me please
I imagine it 'might' work if you use a darlington transistor like the 2SD2493, which has a gain of 5000 and max. frequency of 60 mHz, to drive the 'main' NPN transistors. Data sheet here:
It only takes 1mA base current to produce 5 amps of base current for driving the main NPN.
EDIT: The circuit would also require additional modification.I've not had time to look into it myself yet.
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Trying to build a coilgun, need help, suggestion and advice :)
