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Powering A DC Booster From My Pc..

post #1 of 9
Thread Starter 
I plan on hooking up a dc booster module to my computers power supply to translate its 12v current to what I require (50v). My dilema is that while most power supplies state they put out a large number of amps on the 12v rail is that current listed constant or only if the systems components require it.

The reason I'm asking is my dc converter is only rated at an input of 15a max. My power supply puts out 23a. I want to make sure I don't blow the boosters fuse if I connect it. I was under the impression that the power supply has a certain amount of amps available to draw from if required to from its components, and actually the only output that's constant is voltage. I don't believe amps are force fed to our components, but I would rather ask to be sure.

I appreciate your help.
post #2 of 9
Out of curiousity, what do you require the 50V for, and is there a particular reason you'd like to connect it via your pc's power supply?
Just seems to me that it would be easier to pull directly from the socket, then convert down to 50V.
That said, since I don't know what you're planning exactly, that might be a stupid/impossible suggestion.
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post #3 of 9
Thread Starter 
I'm powering my extruder robot, which extrudes plastic components similar to a 3D printer.

I wan to to run it directly from the power supply of the computer, which isn't a problem as long as my initial question can be confirmed.

One needs the other to work so an integrated power source makes more sense.
post #4 of 9
The power supply output is regulated—there are some feedback mechanisms controlling how and when power is drawn and converted to maintain this—to stay somewhat around 12V no matter the load you put on it (until it's too high for it to handle, like above 23A, in which case it should start shutting off). The boost converter draws as much as it needs. Having a power supply with a rating of being able to supply more than you need is no problem.

As you say, the voltage is supposed to be constant; power drawn depends on the load.

Note that if you're using a typical non-enthusiast PC ATX power supply like pretty much every retail unit with 23A or less on +12V, it's probably a group regulated design intended to be used on computers where you're drawing from multiple rails, the output voltage could sag a bit because you're only tapping 12V and this mucks with how the voltage regulation works. I doubt it'd sag enough to be a problem for the boost converter though, especially if you're using well short of the 23A +12V capacity.

Some dated designs may be a little wonky with no load on +5V and +3.3V though, even aside from the above.
post #5 of 9
Quote:
Originally Posted by Storm2313 View Post

The reason I'm asking is my dc converter is only rated at an input of 15a max. My power supply puts out 23a. I want to make sure I don't blow the boosters fuse if I connect it. I was under the impression that the power supply has a certain amount of amps available to draw from if required to from its components, and actually the only output that's constant is voltage. I don't believe amps are force fed to our components, but I would rather ask to be sure.

I appreciate your help.

Think of that 23A supply as "available" power to use. your dc converter is rated to USE 15A MAX of available power.

This is similar to using an 9A vacuum on a 15A wall outlet.

What you would want to be careful of is what voltages the DC converter can use as "input" and that 12v is within that range. (id assume it is, but you should check.)

TL;DR: that last line assumption is correct in this situation. The PSU will only create as much power is used, there is not just 23A of 12V DC waiting to zap your components.
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post #6 of 9
Thread Starter 
This is very interesting information. I thought I was correct about the way amps were reflected by power supply manufacturers, but I think allot of people can learn from this. I'm not into overclocking, but desktop manufacturing.

My converter requires anything from 6-40v to convert to 12v-80v so I'm all set even with slight line fluctuation which I didn't experience with my Fluke multimeter.

I now have a much better understanding of how ATX power supplies amp ratings are to be interpreted. I really appreciate the responses.

Thank you all.thumb.gif
post #7 of 9
Quote:
Originally Posted by Storm2313 View Post

This is very interesting information. I thought I was correct about the way amps were reflected by power supply manufacturers, but I think allot of people can learn from this. I'm not into overclocking, but desktop manufacturing.

My converter requires anything from 6-40v to convert to 12v-80v so I'm all set even with slight line fluctuation which I didn't experience with my Fluke multimeter.

I now have a much better understanding of how ATX power supplies amp ratings are to be interpreted. I really appreciate the responses.

Thank you all.thumb.gif
Is it a voltage doubler or a actual adjustable voltage boost converter?
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post #8 of 9
Oh wait, sorry, I missed the part where you're also simultaneously hooking it up to the computer. That should provide enough draw on the other rails already.

Just make sure you're not going over the total amount the power supply is rated for. How much power is being drawn by the printer, anyway?

Also make sure you're using enough wires for the power drawn. How are you connecting the power supply to the converter? You don't want to draw 10A off of a single 16 AWG line, for example.
post #9 of 9
Thread Starter 
I'm using it as I type this. I'm currently using 18awg shielded cable to the molex rated at 300v so no problems there. I connected the terminals via molex to the converter. It's a converter not a doubler (actually I never heard of that before) It provides up to 10a output variable by a "pot" from the converter, which is more than enough for the extruder.

It's real nice to have a seperate voltage amp rail when you need it.
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