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if you can't find a cheap pulse transformer, for that frequency range you should find most 4mH common mode chokes to be sufficient. as far as driving the transformer, most of the issues people run into is trying to get 100ns or less rise times. its a 36Khz half bridge.. switching time is not at...
what is a non linear load?
you need a certain amount of current drawn to cause ccm, but this has nothing to do with whether the load is linear or not, just how much current it is drawing.
if the converter is bidirectional, then of course, when the current crosses through zero the current will...
well after googling "buck boost 3 phase power factor correction"
i've run across a number of circuits..
none of which are as elegant as my ac sepic converter (lmao)
Rad, did you see the waveforms from my 4 phase boost converter? the damn thing works surprisingly.
i'm working on a 400 volt...
I am not aware of any buck boost 3 phase PFC circuits.
there are several topologies of boost only, i've read lots of documents on those.
i've run across buck only pfc, but it can't get 100% (hardly ever needed anyway)
and you could make a buck boost from a fully controlled rectifier, however...
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the tentative concept is 480 vac in and +/- 200 vdc out.
thoughts?
is this insane?
topologically the switches could be arranged in delta but then you lose the rail splitting effect.
(that and its difficult for me to imagine the switching waveforms in my mind, when the...
the drain voltages are rising because the output capacitance is rather low, like 10uF for that board.
more info in this thread, for the 4 phase version i made.
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I have a taig milling machine, running mach3, i then export the gerbers from kicad, and use pcb2gcode version 1.1.4 using a .01" offset, and a home made milling bit that cuts a reliable .015 to .030" wide cut depending how deep it is.
setting the dpi of pcb2gcode at 333 also cuts the code length...
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There is some weird stuff going on here at the beginning of each 120 hz half wave.
There are a number of separate issues going on that cause this start up glitch.
number one being the error amplifiers were grounded, so the multiplier had 4.7 volts...
the 'current turn off comp' shown connected to the fet is internal to the L6562 --its + input is connected to the output of the multiplier
(the output actually feeds into the output flip flop)
The opamp that is wired as a -1 gain, is the internal error amplifier.
i don't know what i was...
well i had three of these things,
and then one of them died when something shorted out on the board.
and then i compromised the other two by sending 15 volts into the multiplier. (internally clamped at 5 volts).. and they work sometimes.
but the two that work partially seem to at least prove...
the 50n05 fets i'm using are actually obsolete, but they appear to be similar to the 50n06 which is still available.
It would appear there is a 50% increase in resistance from 33C to 120C
which for this application is fine, because it will provide natural current limiting, although a less steep...
I haven't installed the boost inductors but I'm about to fire up 3 of these things in parallel.
the schematic is straight out of the data sheet, but the current sense resistors are connected in parallel as in the above diagram.
turns out heatsinkable resistors are more expensive than mosfets...
i only assumed that the internal gate resistance is on the order of a square grid of capacitors from gate to source, capacitors connected to the drain, and connected by resistors.
the bond wire could be connected to the edge of the square grid, or in the center. all the ones i've seen the gate...
i have a few fundamental problems with some of the material in the attached paper in the first post.
A high internal resistance mosfet should still have some of the mosfet cells turned on when the gate is pulled high, effectively instantly; i recall reading that the actual switching time for a...
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