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Author Topic: Question - 600 Volts to 12 Volts?  (Read 1319 times)
DAPAQ2
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« on: March 06, 2013, 01:01:51 AM »

Gang,

I'd like to ask if anyone know of any DC to DC power converters on the market that will take 600 Volts D.C. and drop it down to 12 Volts D.C.?

Thanks,

Doug
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DAPAQ2
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« Reply #1 on: March 06, 2013, 05:38:30 AM »

... or if not down to 12 volts D.C., what about reducing 600 Volts D.C. down to any lower voltage?

Anyone make D.C. to D.C. converters with an input voltage of 600 d.c.?

Thanks,

Doug
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K8AXW
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« Reply #2 on: March 06, 2013, 08:28:53 AM »

Doug:

I've never heard of a 600vdc to 12vdc converter.  I was reminded of an old saying, "There's reason to all things!"

Going from 600vdc down to 12vdc is about as close to unreasonable as I can imagine.  The main thing I would always worry about is if I had a component or circuit failure and the 600v gets into my 12v load.

You could change out the transformer powering the unit to give you a lower secondary voltage and go from there.  But this would probably mean changing the filter circuit as well because of the current capability or demand of the 600V vs. the 12V loads.

At this stage you're redesigning a power supply and so what would be the point?

« Last Edit: March 06, 2013, 08:35:03 AM by K8AXW » Logged
KD0REQ
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« Reply #3 on: March 06, 2013, 10:31:54 AM »

you can't find a wall wart for two bucks in a thrift store?
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KG4RUL
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« Reply #4 on: March 06, 2013, 07:58:21 PM »

On subway cars, we used Motor-Generator sets to get 700VDC down to 120VAC and 24VDC.
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KE3WD
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« Reply #5 on: March 07, 2013, 06:16:52 AM »

Not enough info given to give a valid answer. 

Current ratings of the 600VDC supplied, plus the amount of Current needed at the 12VDC level are important here. 

The voltages alone are just not enough to define the problem.


73
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AA4PB
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« Reply #6 on: March 07, 2013, 06:25:14 AM »

Exactly! If you only need 10mA at 12V then a simple resistor and zenier could work. If you need 10A at 12V then it's a whole lot more complex problem.
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AC2EU
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« Reply #7 on: March 07, 2013, 06:35:31 AM »

Some sort of dc-dc bucking regulator might be possible, but that is a big difference in voltage.
A step down inverter that will tolerate 600v input would probably be the the most efficient choice.

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K9YLI
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« Reply #8 on: March 09, 2013, 09:25:00 AM »

Un answered question.  where does the  600 volts come from..   
Perhaps it would be easier  to  use the input to the 600 v  dc to convert to  12 volts.
Not many 600 volt  generators out there.  So  x voltage  up to 600 vdc.
then why not  X voltage  down to  12 v dc.
un less its  from an industrial machine  and the need for  a radio init.

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M0HCN
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« Reply #9 on: March 09, 2013, 12:27:19 PM »

Not viable with a standard buck converter as the duty cycle would be tiny, so it would have to be some kind of forward or flyback affair which is good as it means isolation is possible.

I don't know of anything much off the shelf, but it does not look like being that hard a design problem (The output of the PFC stage in a standard mains switchmode supply is 400V or so, so something similar to the output half of a decent switcher would get you there.

800V and even 1200V mosfets are commonplace these days, half bridge into a transformer with capacitive divider on the other side and rectify the output, it is almost textbook design.

TL494 or similar as a controller, with opto for the feedback at maybe 100Khz or so?

How much power are we talking?
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