12v=19v 4,7A dcdc

[N-Channel]

If you're talking about the 2-F boost converter, look at post #35, this thread.

 

[luka]

Hi

What that...how did I miss that. Anyway thanks. Maybe you can tell why did you use what switch, what voltages do you get?

 

[N-Channel]

I chose the MTP75N06 because it has only 9mW Rds(on), can pass 75A thru its drain, and I had alot of them lying around. I also had the SMT version of them, if I wanted to downsize the circuit.

When switch S1 is closed, V(out) is ~16V, and when it is open, V(out) is ~20V. Guy I did it for needed compatibility with both his laptops.

 

[jamesrnz]

so i am trying to get rid of huge spikes at turn off on kampenens,
i have rewound the transformer and am using 216 of number 36 for my windings?

jimbo

 

[N-Channel]

Let me see if I understand this right: You're using 216 strands of #36 AWG wire? OK, That should do fine (I assume this is your version of Litz wire?)

Not sure why you're getting huge turn-off spikes. Might want to check your leakage inductance, this is usually the cause.

 

[jamesrnz]

this is some wire i got from space junk in orlando.
it is already sort of twisted slightly.

i have it on a large e-e core.

i have to look closer when i get back in town.

thanks

 

[jamesrnz]

turnoff spike

sooo i am using schottkies for the mosfet protection and schottkies for the rectifiers on the secondary.

should i be using ultra fast or fast recovery types? i am operating around 150khz......

 

[N-Channel]

Schottkys should be fine, especially for the output rectifiers because of their lower forward voltage drop (very important for high-current outputs). A while ago, I found some Schottkys with a 200PIV rating. A couple of years ago, I had heard of some 600V Schottkys, but nothing since.

 

[jamesrnz]

i think i have too many turns on the transformer. i am going to recalculate and see if i can get that pesky spike down to an acceptable level.

i was looking at maybe adding a lossless snubber........

 

[N-Channel]

Couple o' threads on that subject going on right now. Less turns to get rid of the spike might sound like a good idea. I would look at either Brown, Chryssis, or one of the NSC or ONSemi App Notes.

 

[N-Channel]

Gen-Set Update

I took some pics of my working Gen-Set yesterday and will upload them later today ot tonight. Sorry, no videos, just still pics. Also have another project I finished about a month ago: Took some old car audio components and made a "home" system out of them.

I'm not sure which is more impressive, the system components, or the cabinet they went into. Had LOTS of help from neighbor who has a good woodworking shop. Will look for the appropriate thread to post it to, and advise accordingly.

 

[N-Channel]

Here are some pics of the Gen-Set.

1) Finished Gen-set

 

[N-Channel]

2) Control Panel

 

[N-Channel]

3) DC Output Posts and alternator light (kinda low-tech, but it works!) The left switch is the alternator field's on/off switch, and the right switch starts, stops, and runs the engine. The inverter can be switched on and off independently of the alternator and engine, thus yielding totally silent power (minus the inverter fan's noise).

 

[N-Channel]

4) Alternator - Delco-Remy CS-144-series rated at 140A!

 

[N-Channel]

5) another alternator shot.

 

[N-Channel]

6) The Engine: a Briggs & Stratton 6HP OHV vertical-shaft with electric- and pull-start. It has a 0.5A "alternator" coil to recharge the starter battery. Of course it is disconnected in favor of the slightly higher-output Delco.

 

[N-Channel]

7) The electric starter

 

[N-Channel]

8) The Xantrex Pro-Sine 1800 - prior to installation

 

[N-Channel]

9) And the finale: the Inverter - output side.