DC Voltage Doubler

J

John

Guest
Hello

What's the best (easiest) way to double a 9V DC supply to 18V DC? The 9V
comes from a 78L09 regulator. The current requirements are very low. Do
any chips exist to do it? I'm an electronics novice so the simpler the
better.

Thanks.
 
John wrote:
Hello

What's the best (easiest) way to double a 9V DC supply to 18V DC? The 9V
comes from a 78L09 regulator. The current requirements are very low. Do
any chips exist to do it? I'm an electronics novice so the simpler the
better.

Thanks.
Click to expand...
There are capacitor switches that charge one cap with the supply, then
connect it in series with the supply to double it. These need only a
couple capacitors to double (or make a negative of) a supply. The
base number for one such chip is 7660.

http://www.udl.es/usuaris/p7806757/0000-pdf/conversores%20cc%20cc/7660.PDF
http://www.linear.com/pdf/lt1044.pdf
http://ww1.microchip.com/downloads/en/DeviceDoc/21465b.pdf
--
John Popelish
 
John Popelish wrote:

John wrote:

Hello

What's the best (easiest) way to double a 9V DC supply to 18V DC? The 9V
comes from a 78L09 regulator. The current requirements are very low. Do
any chips exist to do it? I'm an electronics novice so the simpler the
better.

Thanks.

There are capacitor switches that charge one cap with the supply, then
connect it in series with the supply to double it. These need only a
couple capacitors to double (or make a negative of) a supply. The
base number for one such chip is 7660.

http://www.udl.es/usuaris/p7806757/0000-pdf/conversores%20cc%20cc/7660.PDF
http://www.linear.com/pdf/lt1044.pdf
http://ww1.microchip.com/downloads/en/DeviceDoc/21465b.pdf
Click to expand...
Would it make more sense to supply the doubler with the same raw DC as
the 7909 is getting?

Thanks,
Rich
 
Rich Grise wrote:
John Popelish wrote:

John wrote:

Hello

What's the best (easiest) way to double a 9V DC supply to 18V DC? The 9V
comes from a 78L09 regulator. The current requirements are very low. Do
any chips exist to do it? I'm an electronics novice so the simpler the
better.

Thanks.

There are capacitor switches that charge one cap with the supply, then
connect it in series with the supply to double it. These need only a
couple capacitors to double (or make a negative of) a supply. The
base number for one such chip is 7660.

http://www.udl.es/usuaris/p7806757/0000-pdf/conversores%20cc%20cc/7660.PDF
http://www.linear.com/pdf/lt1044.pdf
http://ww1.microchip.com/downloads/en/DeviceDoc/21465b.pdf

Would it make more sense to supply the doubler with the same raw DC as
the 7909 is getting?
Click to expand...
The HT7660 is speced for an absolute maximum input of 13 volts, the
lt1044 for 9.5 volts, and the TC7660 for 10.5 volts. So, maybe, but
doubtful.


--
John Popelish
 
Subject: DC Voltage Doubler
From: "John" John@john.com
Date: 8/4/2004 6:15 PM Central Daylight Time
Message-id: <cerqnk$kh7$1@news6.svr.pol.co.uk

Hello

What's the best (easiest) way to double a 9V DC supply to 18V DC? The 9V
comes from a 78L09 regulator. The current requirements are very low. Do
any chips exist to do it? I'm an electronics novice so the simpler the
better.

Thanks.
Click to expand...
If you need something right away, and the chips mentioned by other posts aren't
available, try a 555-based voltage doubler. If you use a 555, you'll need 2
more resistors, two extra diodes and one extra cap:

http://www.reconnsworld.com/power_voltdoubler.html

Good luck
Chris
 
In article <4111AB58.3D51862E@rica.net>, John Popelish
<jpopelish@rica.net> writes
Rich Grise wrote:

John Popelish wrote:

John wrote:

Hello

What's the best (easiest) way to double a 9V DC supply to 18V DC? The 9V
comes from a 78L09 regulator. The current requirements are very low. Do
any chips exist to do it? I'm an electronics novice so the simpler the
better.

Thanks.

There are capacitor switches that charge one cap with the supply, then
connect it in series with the supply to double it. These need only a
couple capacitors to double (or make a negative of) a supply. The
base number for one such chip is 7660.

http://www.udl.es/usuaris/p7806757/0000-pdf/conversores%20cc%20cc/7660.PDF
http://www.linear.com/pdf/lt1044.pdf
http://ww1.microchip.com/downloads/en/DeviceDoc/21465b.pdf

Would it make more sense to supply the doubler with the same raw DC as
the 7909 is getting?

The HT7660 is speced for an absolute maximum input of 13 volts, the
lt1044 for 9.5 volts, and the TC7660 for 10.5 volts. So, maybe, but
doubtful.


Generate a supply limited square wave, couple to a voltage doubler (3
Click to expand...
diodes + 3 capacitors) sitting on top of the + supply . O/P = 9V + 2X9V
- volt drops minimised by using schottky diodes.
Regulate o/p down to 18V.

--
ddwyer
 
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