boosting battery voltage

J

Joe

Guest
I have an application where I need to use 5V (433MHZ receiver module). I am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of space
constraints in this project, I was wondering if there is any such (fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V) and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts, but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe
 
"Joe" <nuisancewildlife@nospamearthlink.net> schreef in bericht
news:YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net...
I have an application where I need to use 5V (433MHZ receiver module). I
am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of space
constraints in this project, I was wondering if there is any such (fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V) and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts, but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe
Click to expand...
Joe,

Google for "boost mode smps"

petrus



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Joe wrote:

I have an application where I need to use 5V (433MHZ receiver module). I am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of space
constraints in this project, I was wondering if there is any such (fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V) and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts, but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

Yes, there are ICs which do this.
Click to expand...

Look for Switched Mode Power Supplies (SMPS), switching regulators or
DC-DC converters. There are devices which can step the voltage up and
devices which can step the voltage down, obviously you want the "boost"
or "step up" type.

National Semiconductor have a good selection of ICs, see:

http://www.national.com/parametric/0,1850,1758,00.html

see also:

www.maxim-ic.com
www.linear.com
www.ti.com


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To reply to me directly:

Replace privacy.net with: totalise DOT co DOT uk and replace me with
gareth.harris
 
"Joe" <nuisancewildlife@nospamearthlink.net> wrote in message news:<YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net>...
I have an application where I need to use 5V (433MHZ receiver module). I am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of space
constraints in this project, I was wondering if there is any such (fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V) and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts, but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe
Click to expand...
You could possibly use a ICL7660, and only two batteries. It will almost double it.

Gary
 
"Joe" <nuisancewildlife@nospamearthlink.net> wrote in message news:<YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net>...
I have an application where I need to use 5V (433MHZ receiver module). I am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of space
constraints in this project, I was wondering if there is any such (fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V) and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts, but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe
Click to expand...
Hi Joe,
Try "DC to DC converter" (or similar) "step up" "Switching power
supply" "boost converter"
Might have an easier time just trying different style / chemistry
batts though.

Good Luck,
Arch
 
"petrus bitbyter" <p.kralt@reducespamforchello.nl> wrote in message
news:sBUic.151049$s9.109879@amsnews02.chello.com...
"Joe" <nuisancewildlife@nospamearthlink.net> schreef in bericht
news:YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net...
I have an application where I need to use 5V (433MHZ receiver module).
I
am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of
space
constraints in this project, I was wondering if there is any such
(fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V)
and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts,
but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe



Joe,

Google for "boost mode smps"

petrus



---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.656 / Virus Database: 421 - Release Date: 9-4-2004
Click to expand...
Thank you, Petrus. Lots of hits, I will have to sort thru them. I was
hoping to find a simple circuit that I could build myself to do what I need.
There are some circuits out there that show basically an inductor, a switch,
and a cap or RC network. The switch looks like some kind of transistor, but
It didn't show what was driving it. Anyway, at least now I know what to look
for.

Joe
 
"Gareth" <me@privacy.net> wrote in message
news:c6hbh1$c58dj$1@ID-211380.news.uni-berlin.de...
Joe wrote:

I have an application where I need to use 5V (433MHZ receiver module).
I am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of
space
constraints in this project, I was wondering if there is any such
(fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V)
and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts,
but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

Yes, there are ICs which do this.

Look for Switched Mode Power Supplies (SMPS), switching regulators or
DC-DC converters. There are devices which can step the voltage up and
devices which can step the voltage down, obviously you want the "boost"
or "step up" type.

National Semiconductor have a good selection of ICs, see:

http://www.national.com/parametric/0,1850,1758,00.html

see also:

www.maxim-ic.com
www.linear.com
www.ti.com


--
-----------------------------------------------------------------------
To reply to me directly:

Replace privacy.net with: totalise DOT co DOT uk and replace me with
gareth.harris
Click to expand...

Thanks for the links, Gareth. I will be sorting thru those sites the next
few hours.

Joe
 
"Joe" <nuisancewildlife@nospamearthlink.net> wrote in message
news:YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net...
I have an application where I need to use 5V (433MHZ receiver module). I
am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of space
constraints in this project, I was wondering if there is any such (fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V) and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts, but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe
Click to expand...
Hi Joe.

Go to http://www.linear.com/software/, and download LTSpice (its free.) If
you install it, and open "switch selector guide" from the file menu, it'll
prompt you for input and output voltages and current requirements, and then
design a SMPS for you automatically (using one of linear's parts, of
course.)

You can also build these from discrete components, but its going to be
simpler to get something going with one of these chips and a few spare
parts.

Regards,
Bob Monsen
 
if the receiver is not drawing to much you can get a DC-DC converter chip.
they have some average ones that can produce up to 1 amp using power
source as low as .9 volts the last time i looked.


Joe wrote:
I have an application where I need to use 5V (433MHZ receiver module). I am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of space
constraints in this project, I was wondering if there is any such (fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V) and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts, but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe
Click to expand...
 
"Gary Lecomte" <chemelec@hotmail.com> wrote in message
news:ca76d1a9.0404251426.2fe6e9dd@posting.google.com...
"Joe" <nuisancewildlife@nospamearthlink.net> wrote in message
news:<YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net>...
I have an application where I need to use 5V (433MHZ receiver module).
I am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of
space
constraints in this project, I was wondering if there is any such
(fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V)
and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts,
but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe

You could possibly use a ICL7660, and only two batteries. It will almost
double it.

Gary
Click to expand...
Hi Gary,

Thanks for that info. The ICL7660 only supplies 10mA, but, while on that
same page (Maxim), I found the maxim 1759. I am not sure yet if this will
work, but I will keep looking. My requirement is now to be able to use 2 C
alkaline cells to generate 5V for a 433MHZ receiver module and its
associated decoder (HT12D). When the data is received, at first, all I plan
on doing is usint a nor gate latch and flashing a LED (~20mA), but
eventually I want to turn on a solenoid to press the shutter button on a
camera (will need possibly up to 200mA).

I found a home brew boost converter on the web somewhere and have only
LTspiced it so far, but it looks like it is very load sensitive and draws a
huge amount of current when the transistor is on. I can post it to ABSE if
anyone is interested.

Joe
 
"Colubris" <archilochus57@yahoo.com> wrote in message
news:b42cfb8e.0404251515.134887cc@posting.google.com...
"Joe" <nuisancewildlife@nospamearthlink.net> wrote in message
news:<YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net>...
I have an application where I need to use 5V (433MHZ receiver module).
I am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of
space
constraints in this project, I was wondering if there is any such
(fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V)
and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts,
but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe

Hi Joe,
Try "DC to DC converter" (or similar) "step up" "Switching power
supply" "boost converter"
Might have an easier time just trying different style / chemistry
batts though.

Good Luck,
Arch
Click to expand...
Thanks Arch,

Is there a such thing as a 5Volt battery that's not terribly expensive?
(This is a hobby project, probly one or two at most). If not, what would you
suggest for style/chemistry? I need 5 volts and at least 50mA capability,
possibly more if I use a solenoid.

Joe
 
"Robert C Monsen" <rcsurname@comcast.net> wrote in message
news:u70jc.21769$0u6.3780837@attbi_s03...
"Joe" <nuisancewildlife@nospamearthlink.net> wrote in message
news:YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net...
I have an application where I need to use 5V (433MHZ receiver module).
I
am
using batteries (alkaline 1.5V). I have tried using 4 batteries and then
using a diode to drop the voltage to about 5.4Volts, but, because of
space
constraints in this project, I was wondering if there is any such
(fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V)
and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5 Volts,
but
it does not seem to perform very well at 4.5V so I would like to use at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe



Hi Joe.

Go to http://www.linear.com/software/, and download LTSpice (its free.) If
you install it, and open "switch selector guide" from the file menu, it'll
prompt you for input and output voltages and current requirements, and
then
design a SMPS for you automatically (using one of linear's parts, of
course.)

You can also build these from discrete components, but its going to be
simpler to get something going with one of these chips and a few spare
parts.

Regards,
Bob Monsen
Click to expand...
Thanks Robert,

I have LTSPICE, but did not think to look at their components. I seem to
remember that their ICs needed a lot of spare components. I can check again.
Just scroll down the component list. Maybe I shoul ask on the yahoo LTSPICE
list I am on, duh! (LOL)

Joe
 
"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:108p5ehihekbe1d@corp.supernews.com...
if the receiver is not drawing to much you can get a DC-DC converter chip.
they have some average ones that can produce up to 1 amp using power
source as low as .9 volts the last time i looked.


Thanks Jamie,
Click to expand...

1 amp would be more than adequate, Any part numbers come to mind?

Joe
 
"petrus bitbyter" <p.kralt@reducespamforchello.nl> wrote in message
news:sBUic.151049$s9.109879@amsnews02.chello.com...
"Joe" <nuisancewildlife@nospamearthlink.net> schreef in bericht
news:YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net...
I have an application where I need to use 5V (433MHZ receiver
module). I am
using batteries (alkaline 1.5V). I have tried using 4 batteries and
then
using a diode to drop the voltage to about 5.4Volts, but, because of
space
constraints in this project, I was wondering if there is any such
(fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V)
and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5
Volts, but
it does not seem to perform very well at 4.5V so I would like to use
at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe
Click to expand...

Joe,

Google for "boost mode smps"

petrus
Click to expand...
Or try for DC-DC converter.
http://www.solarbotics.net/library/datasheets/LT1111.pdf

> ---
 
"Robert C Monsen" <rcsurname@comcast.net> wrote in message
news:u70jc.21769$0u6.3780837@attbi_s03...
"Joe" <nuisancewildlife@nospamearthlink.net> wrote in message
news:YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net...
I have an application where I need to use 5V (433MHZ receiver
module). I
am
using batteries (alkaline 1.5V). I have tried using 4 batteries and
then
using a diode to drop the voltage to about 5.4Volts, but, because of
space
constraints in this project, I was wondering if there is any such
(fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V)
and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5
Volts, but
it does not seem to perform very well at 4.5V so I would like to use
at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe



Hi Joe.

Go to http://www.linear.com/software/, and download LTSpice (its
free.) If
you install it, and open "switch selector guide" from the file menu,
it'll
prompt you for input and output voltages and current requirements, and
then
design a SMPS for you automatically (using one of linear's parts, of
course.)

You can also build these from discrete components, but its going to be
simpler to get something going with one of these chips and a few spare
parts.

Regards,
Bob Monsen
Click to expand...
But do they still sell their chips in thru-hole versions? Most of what
I see on Maxim is surface mount.
 
"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com> wrote
in message news:1090gj7f8a3hk21@corp.supernews.com...
"Robert C Monsen" <rcsurname@comcast.net> wrote in message
news:u70jc.21769$0u6.3780837@attbi_s03...
"Joe" <nuisancewildlife@nospamearthlink.net> wrote in message
news:YOSic.8995$eZ5.113@newsread1.news.pas.earthlink.net...
I have an application where I need to use 5V (433MHZ receiver
module). I
am
using batteries (alkaline 1.5V). I have tried using 4 batteries and
then
using a diode to drop the voltage to about 5.4Volts, but, because of
space
constraints in this project, I was wondering if there is any such
(fairly
simple) circuit that would allow me to use 3 batteries (total 4.5V)
and
somehow get my 5 volts. The spec of the RX module is 4.5 to 5.5
Volts, but
it does not seem to perform very well at 4.5V so I would like to use
at
least 5Volts. Is this possible?

If I know what it is called, I can google for it.

TIA,
Joe



Hi Joe.

Go to http://www.linear.com/software/, and download LTSpice (its
free.) If
you install it, and open "switch selector guide" from the file menu,
it'll
prompt you for input and output voltages and current requirements, and
then
design a SMPS for you automatically (using one of linear's parts, of
course.)

You can also build these from discrete components, but its going to be
simpler to get something going with one of these chips and a few spare
parts.

Regards,
Bob Monsen

But do they still sell their chips in thru-hole versions? Most of what
I see on Maxim is surface mount.
Click to expand...

Thanks for the info, watts. Just about everything i am finding is surface
mount. I did find something in the mouser catalog and I ordered a couple of
them today to see if they will work. The part number is ST619LBN. It comes
in a dip 8 package and you just have to hang 4 capacitors onto it.

Joe
 
"Joe" <nuisancewildlife@nospamearthlink.net> wrote in message
news:xihjc.13915
Hi Gary,

Thanks for that info. The ICL7660 only supplies 10mA, but, while on that
same page (Maxim), I found the maxim 1759. I am not sure yet if this will
work, but I will keep looking. My requirement is now to be able to use 2 C
alkaline cells to generate 5V for a 433MHZ receiver module and its
associated decoder (HT12D). When the data is received, at first, all I
plan
on doing is usint a nor gate latch and flashing a LED (~20mA), but
eventually I want to turn on a solenoid to press the shutter button on a
camera (will need possibly up to 200mA).

I found a home brew boost converter on the web somewhere and have only
LTspiced it so far, but it looks like it is very load sensitive and draws
a
huge amount of current when the transistor is on. I can post it to ABSE if
anyone is interested.

Joe

It's probably just laziness on my part, but if I had room for two C
Click to expand...
cells and a SMPS, I'd probably use 4 AAs and a diode.

Have fun!
Rich
 
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