| Author |
Message |
BigJp
Guest
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 Posted:
Fri Oct 07, 2005 8:35 am Post subject:
small voltage converter 5v -> 50v |
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I need somthing to convert an input voltage of between 3.6 and 7 volts
up to 50 volts in 5v steps, and it has to fit in 2x2cm square(or
smaller). The project will use a uController so i will have a PWM
available. Will boost converters work for this or will i need something
else? The amps will be pretty low, not exactly sure yet how many but
low enough so it will not hurt you if you get shocked by it. The final
output will be a square wave, if that matters.
I am a computer science engineering student working on a senior design
project so my EE is a little flaky.
Thanks in advance
Justin
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Guest
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| Posted:
Sat Oct 08, 2005 12:35 am Post subject:
Re: small voltage converter 5v -> 50v |
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On 6 Oct 2005 20:42:17 -0700, "BigJp" <justinpatterson@gmail.com>
wrote:
| Quote: | I need somthing to convert an input voltage of between 3.6 and 7 volts
up to 50 volts in 5v steps, and it has to fit in 2x2cm square(or
smaller). The project will use a uController so i will have a PWM
available. Will boost converters work for this or will i need something
else? The amps will be pretty low, not exactly sure yet how many but
low enough so it will not hurt you if you get shocked by it. The final
output will be a square wave, if that matters.
I am a computer science engineering student working on a senior design
project so my EE is a little flaky.
Thanks in advance
Justin
|
Just to start - this is a DC to AC converter? or DC to pulsed DC? or
DC to DC?
A square wave by definition is 50% duty cycle so it wouldn't be pulse
width modulated. The time the waveform is high would equal the time
it is low for a "square" wave.
If it is pulse width modulated, pulsed DC output, is the 50 volts out
the RMS value?
Or maybe what you meant was the PWM out is just a way for the
processor to communicate with the power supply?
Amps out? I was taught it takes at least 100 milliamps through a
vital organ to kill a person, but they didn't say how they arrived at
that figure.
I get the idea that what you meant to say is you want a 5-50 volt DC
to DC converter (then the 5 volt steps start to make sense). Is that
what you meant to say?
If it is DC to DC a boost converter could be made to do it, but a step
up transformer may be the best way.
You don't specify how accurate the output voltage regulation has to
be. Is the idea to control the output with the UPC in a closed
feedback loop? How fast can the processor supply toggles for the step
up transformer or inductor? You have a A/D to monitor voltage? (or
some way to fake it)
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CWatters
Guest
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| Posted:
Sat Oct 08, 2005 8:35 am Post subject:
Re: small voltage converter 5v -> 50v |
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"BigJp" <justinpatterson@gmail.com> wrote in message
news:1128656537.273805.322230@o13g2000cwo.googlegroups.com...
| Quote: | I need somthing to convert an input voltage of between 3.6 and 7 volts
up to 50 volts in 5v steps, and it has to fit in 2x2cm square(or
smaller). The project will use a uController so i will have a PWM
available. Will boost converters work for this or will i need something
else? The amps will be pretty low, not exactly sure yet how many but
low enough so it will not hurt you if you get shocked by it. The final
output will be a square wave, if that matters.
I am a computer science engineering student working on a senior design
project so my EE is a little flaky.
|
Perhaps...
http://www.maxim-ic.com/appnotes.cfm/appnote_number/1109
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BigJp
Guest
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| Posted:
Wed Oct 12, 2005 7:08 am Post subject:
Re: small voltage converter 5v -> 50v |
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| Quote: | I get the idea that what you meant to say is you want a 5-50 volt DC
to DC converter (then the 5 volt steps start to make sense). Is that |
what you meant to say?
I am not sure.
I will have a 5v regulated input from batteries. The output voltage
needs to be able to be set from 5 volts to 50volts in 5 volt
increments.ie I need to be able to output any of the following
voltages: 5,10,15,20,25,30,35,40,45,50. all in a square wave.
I am not sure on the required accuracy(good question) but i would think
it needs to be around .05 volts
I am using the A/D on the chip for something else so i would rather not
have to use it.
the proc can supply 1ms toggles
The chip posted also looks interesting |
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CWatters
Guest
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| Posted:
Thu Oct 13, 2005 8:35 am Post subject:
Re: small voltage converter 5v -> 50v |
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"BigJp" <justinpatterson@gmail.com> wrote in message
news:1129082913.490567.48650@g14g2000cwa.googlegroups.com...
| Quote: | I get the idea that what you meant to say is you want a 5-50 volt DC
to DC converter (then the 5 volt steps start to make sense). Is that
what you meant to say?
I am not sure.
I will have a 5v regulated input from batteries. The output voltage
needs to be able to be set from 5 volts to 50volts in 5 volt
increments.ie I need to be able to output any of the following
voltages: 5,10,15,20,25,30,35,40,45,50. all in a square wave.
I am not sure on the required accuracy(good question) but i would think
it needs to be around .05 volts
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Thats quite accurate. 0.05V at 50V is only 0.1% |
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roma
Guest
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| Posted:
Sat Oct 22, 2005 12:35 am Post subject:
Re: small voltage converter 5v -> 50v |
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"BigJp" <justinpatterson@gmail.com> wrote in
news:1128656537.273805.322230@o13g2000cwo.googlegroups.com:
| Quote: | I need somthing to convert an input voltage of between 3.6 and 7
volts
up to 50 volts in 5v steps, and it has to fit in 2x2cm square(or
smaller). The project will use a uController so i will have a PWM
available. Will boost converters work for this or will i need
something
else? The amps will be pretty low, not exactly sure yet how many but
low enough so it will not hurt you if you get shocked by it. The
final
output will be a square wave, if that matters.
I am a computer science engineering student working on a senior
design
project so my EE is a little flaky.
Thanks in advance
Justin
|
You can us this small inverter , calculate the output winding for your
required voltages , or use regulators (TO92) in step,
http://members.shaw.ca/roma/eleven.html
roma |
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