a question on power supply, i am new
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hi all
i have a question on power supply.
suppose i want to get max output of 24V@3A
and i can only get a parallel 12V@3A(24VCT) transformer
is there anyway that i can get 24V@2A from this transformer?
can i use step-up dc-dc converter to do the job?
if it can be done, how?
or is there any easy way to achieve the goal?
the ouput can vary from 0 to 24V@3A.
i have a question on power supply.
suppose i want to get max output of 24V@3A
and i can only get a parallel 12V@3A(24VCT) transformer
is there anyway that i can get 24V@2A from this transformer?
can i use step-up dc-dc converter to do the job?
if it can be done, how?
or is there any easy way to achieve the goal?
the ouput can vary from 0 to 24V@3A.
Comments
> hi all
>
> i have a question on power supply.
> suppose i want to get max output of 24V@3A
> and i can only get a parallel 12V@3A(24VCT) transformer
> is there anyway that i can get 24V@2A from this transformer?
> can i use step-up dc-dc converter to do the job?
> if it can be done, how?
> or is there any easy way to achieve the goal?
> the ouput can vary from 0 to 24V@3A.
Probably the easiest way is to get a new transformer.
Assuming your unit is 6V from center tap to either side, and 12V
across the coils, you don't have enough current.
A second transformer in series would offer 24V at 3 amps, or in
parallel, would offer 12V @ 6amps.
a DC to DC converter will cost much more than a new transformer but
will only up the voltage, not the amps. in fact, you will lose the
amps when you up the voltge.
Check www.mpja.com or Jameco for transformers.
Dave
Just tie one end of the one 12 v winding to the other end of the next 12
volt winding. The two remaining connections will be 24 volts. Measure the
output voltage and if it is very low instead of 24 volts nominal, just move
the connection to the other end of one winding and that should fix the
problem. If the output is truely 24 volts ct, then you need do no jumpers.
The output is already 24 volts and the center tap will be 12 volts. I hope
I didn't confuse you more!
jim
http://www.geocities.com/jimforkin2003/
Original Message
From: i_drives [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8-Dc3NkZgo9Lwr_9DgFXYqzsbusHcbeSUXkaOCY_DpEmpy5eqTvjvcenrvBaZyT8-3wIYbxydEfNpA]i_drives@y...[/url
Sent: Tuesday, November 18, 2003 1:25 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] a question on power supply, i am new
hi all
i have a question on power supply.
suppose i want to get max output of 24V@3A
and i can only get a parallel 12V@3A(24VCT) transformer
is there anyway that i can get 24V@2A from this transformer?
can i use step-up dc-dc converter to do the job?
if it can be done, how?
or is there any easy way to achieve the goal?
the ouput can vary from 0 to 24V@3A.
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transformer?
if so, is there anyway to get negative voltage?
thanks for you reply
--- In basicstamps@yahoogroups.com, "Jim Forkin" <jjf@p...> wrote:
> If you wire the two output 12v@3a in series, the uoutput will be
24 v @3a.
> Just tie one end of the one 12 v winding to the other end of the
next 12
> volt winding. The two remaining connections will be 24 volts.
Measure the
> output voltage and if it is very low instead of 24 volts nominal,
just move
> the connection to the other end of one winding and that should fix
the
> problem. If the output is truely 24 volts ct, then you need do no
jumpers.
> The output is already 24 volts and the center tap will be 12
volts. I hope
> I didn't confuse you more!
> jim
> http://www.geocities.com/jimforkin2003/
>
>
>
Original Message
> From: i_drives [noparse][[/noparse]mailto:i_drives@y...]
> Sent: Tuesday, November 18, 2003 1:25 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] a question on power supply, i am new
>
>
> hi all
>
> i have a question on power supply.
> suppose i want to get max output of 24V@3A
> and i can only get a parallel 12V@3A(24VCT) transformer
> is there anyway that i can get 24V@2A from this transformer?
> can i use step-up dc-dc converter to do the job?
> if it can be done, how?
> or is there any easy way to achieve the goal?
> the ouput can vary from 0 to 24V@3A.
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> does that mean that i can not get negative voltage output from
> transformer?
> if so, is there anyway to get negative voltage?
>
> thanks for you reply
google 'free lunch'
you wanna get 24V from a 12V transformer, and get 4 amps from a 3 amp
unit, plus also get a negative voltage?
The 12V/3A unit delivers 36 watts at 12V
and only 1.5 amps at 24V.
with a center tap, you can get +6 and -6 if it is 6-12-6
Dave
Transformers do not produce direct current. They only produce alternating
current at the frequency applied to the primary side and at a voltage
determined by the ratio of the primary to secondary turns. A multi-winding
transformer can have one winding rectified and filtered to produce a
negative voltage as related to the other winding(s). This is not to say that
an ac voltage can not be negative (or positive) to another voltage.
Hope this clarified the situation a bit.
jim
http://www.geocities.com/jimforkin2003/
Original Message
From: Dave Mucha [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=K70ED-AUQUmUJ1E1kCXb4qq5tGYRnnjI7rgx8Q5DvFVXVZ0LKSVIx6F8AwG4TdL3we7Mm0zpJ4M]davemucha@j...[/url
Sent: Tuesday, November 18, 2003 4:48 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: a question on power supply, i am new
--- In basicstamps@yahoogroups.com, "i_drives" <i_drives@y...> wrote:
> does that mean that i can not get negative voltage output from
> transformer?
> if so, is there anyway to get negative voltage?
>
> thanks for you reply
google 'free lunch'
you wanna get 24V from a 12V transformer, and get 4 amps from a 3 amp
unit, plus also get a negative voltage?
The 12V/3A unit delivers 36 watts at 12V
and only 1.5 amps at 24V.
with a center tap, you can get +6 and -6 if it is 6-12-6
Dave
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