J
Jamie Morken
- Jan 1, 1970
- 0
Terry said:Jamie said:Terry said:Jamie Morken wrote:
legg wrote:
Here is the ltspice circuit so far:
"http://www.rocketresearch.org/new/3phase PFC/3phaseltspice
test.zip"
Are there any 3phase PFC controller IC's out there?
- All the controller outputs were labeled for ph1 - effectively
shorted together
- All modulator references had the same phase angle. (After
correction, your model will not work with alt solver, so you'll have
to switch back to the normal solver.)
- There was no current feedback. This chip expects to see
negative-going current sensing signals on the Mout pin of less than
1V1 peak.
- Once running, you have to load it to get current waveforms.
- Don't expect to see attempted regulation prior to the 6.5mSec
timestamp, as the inrush and overshoot doesn't clear prior to that
time, even with a 1KW load. Also don't expect 60Hz performance at
600Hz.
The asc file is reworked (and still needs much more attention to run
properly as a simulation) at:
http://www.magma.ca/~legg/TVS/1249-3phase-2.zip
With simulations that take as long to run as this one does,
doublechecking your work, your ideas and your aims becomes important,
prior to pressing the GUI's 'run' button. Make sure you've got plenty
of drive space. The raw files mount up at the rate of about 150Meg per
millisecond of active converter runtime.I'm always surprised that they
run at all.
The Vienna rectifier is about the most expensive,complicated and lossy
version of PFC correction that a body could have picked.
LOL. too true. Im sure they could have added a few more diodes if
they had tried just a little bit harder
Thank you for modifying the sim to work!
What circuits would be better than the vienna rectifier for 3phase
PFC? I found two other ones:
http://www.rocketresearch.org/new/3phase PFC/3 phase PFC stage.png
http://www.rocketresearch.org/new/3phase PFC/3 phase PFC stage2.jpg
I would like to generate +220V and -220V rails, and use them to
generate
splitphase 120VAC sine waves using halfbridges and two LC filters.
What
would be the best 3phase PFC circuit to generate these two rails, or if
not using 3phase PFC, could a boost circuit off the 3phase 6diode
rectifier generate a positive and negative rail?
cheers,
Jamie
It sure can. use a pair of boost converters, with a half-bridge as
the switches, the center-tap of which becomes 0V. So its:
---nnnnnn---+--->|-----+--- V+
| |
3ph X [Cbig]
BR | |
+--0V------+
| |
X [Cbig]
| |
---nnnnnn---+---|<-----+--- V-
X is typically an IGBT half-bridge, but can be FETs etc.
Hi Terry,
I think this is called the "Minnesota rectifier" right? Can it
be used without the centertap neutral of the 3phase source? I think
there is no current loop unless the 3phase neutral is available, but
for my generator we don't have the neutral..
cheers,
Jamie