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12 volt to 13.8 volt
DC/DC Converters (Regulators) |
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High power 12 volt to 13.8 volt
DC/DC converters at low cost. Suitable for voltage stabilization of automobile
electronics, special purpose UPS, etc. |
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Regulates the voltage
and keeps computers and other equipment from turning of during car starting and
other voltage sags
These are Boost Converters. which put out 13.8 volts with an
input voltage of 12V nominal. (10-15V) We stock other output voltages in the
PST-SR700 package, see our web page for options. We also stock an
adjustable version of the SR700 that runs from 15 to 24 volts. This
adjustable dc/dc converter (PST-SR700-adjustable) has a front panel knob to
adjust the voltage, but is otherwise identical to the fixed voltage
converters.
Motors:
Running motors from these units will void the warranty.
| Model Number |
PST-SR500
(formerly PST-DU500)
$118.80
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PST-SR700
(formerly PST-DU700)
$145.48
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PST-SR700-Adjustable
(formerly
PST-DU700 Adjustable)
$154.00
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PST-DC/2812-8
(formerly PST/DC1212-8) Isolated Buck-boost
$144.76
OUT OF STOCK UNTIL END OF SEPT
Click
here for picture |
| Input Voltage Range |
9 VDC to 14 VDC
New
feature: Will not turn off during car starting if the voltage stays above 6
volts |
10 VDC to 15 VDC
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10 V to 30 V |
| Output Voltage |
13.8 VDC |
13.8 VDC |
Adjustable beween 15 and 24
volts |
12 VDC |
| Peak Output Power |
500 Watts (1 to 5 minutes) |
700 Watts (1 to 5 minutes) |
700 Watts (1 to 5 minutes) |
120 Watts |
| Peak Output Current |
36 Amps |
50 Amps |
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10 Amps |
| Continuous Current |
15 Amps |
20 Amps |
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8.3 Amps |
| Continuous Output Power |
207 Watts |
276 Watts |
276 Watts |
100 Watts |
| Output Voltage |
13.8 Volts (adjustable
to 15 volts by internal pot. Outputs up to 24 volts are available from the
factory). |
Front Panel Adustable between 15
to 24 volts |
12 volts, (adjustable between 11
and 13.9 volts with internal pot) |
| No-Load Overhead |
150 mA |
<100 mA |
| Line Regulation |
± 0.07 Volts
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1% |
| Load Regulation |
± 0.14 Volts
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3% |
| Isolation |
Although the output is
isolated from noise, spikes, and voltage sags on the input, the input and
output grounds are common, so this dc to dc converter is not usable in
positive ground cars without totally isolating the equipment being powered from
the frame of the car. |
| Efficiency |
>85% (see chart
below) |
>75-85% |
| Connections |
Screw terminals* |
Screw terminals* |
Screw terminals |
| Dimensions |
200 x 170 x 70 mm
7.9 x 6.7 x
2.8 inches |
200 x 205 x 70
mm
7.9 x 8.0 x 2.8 inches |
300mm x 88mm x 42mm (L x W
xH)
(11.8 in x 3.5 in x 1.7 in)
See drawing |
| Drawing |
Click Here for Drawing |
Click Here for Drawing |
Click Here for Drawing |
| Weight |
1 kg, 2.2 pounds |
1.5 kg, 3.3 pounds
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1.5 kg, 3.3 pounds |
| Price |
PST-SR500
$118.80
1-10 $118.80
11-100 $109.67
101-500
$71.50
500+ $57.75 |
PST-SR700
$145.48
1-10 $145.48
11-100 $138.03
101-500
$90.75
500+ $73.92 |
PST-SR700-adj
$154.00
1-10 $154.00
11-100 $139.57
101-500
$91.85
500+ $82.78 |
PST-DC/2812-8 (formerly
PST/DC1212-8) Isolated Buck-boost
$144.76
1-10 $144.76
11-100 $127.05
101-500
$86.79
500+ $81.07 |
*The two sets of output terminals are
connected together, you can draw all the power from one or the other. There are
two sets of terminals for convenience in case you want to run more than one
piece of equipment.
The following efficiency measurements were made by
the U.S. General Fuel Cell Corporation, and are used with permission.
| Efficiency measurements of the SR-500
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| Vin |
Amps in |
Watts in |
Watts Out |
Efficiency |
| 12.25 V |
3.9 A |
48 |
43 |
89% |
| 12.3 V |
5.6 A |
69 |
64 |
93% |
| 12.11 V |
11.3 A |
137 |
123 |
90% |
| 11.92 |
20.9 |
249 |
213 |
86% |
Advantages:
 Inexpensive high current
DC/DC converter stabilizes voltage in automotive applications.
Also can be used to
provide regulated 12 volts from a sealed lead acid battery--excellent for
special purpose UPS DC battery backups.
High efficiency
>85%.
RF
Noise
Although this was designed for audio equipment, a number of
customers have wanted to use these (and their sister products) in RF
applications. Several customers have used these for Ham Radio applications and
loved them, others found way too much noise for the converter to be useful.
This was a puzzlement. It still is a puzzlement.
However, recently I asked
one of our engineers to dust off our old screen room and investigate the noise.
We found that at full power and lower there was very little radiated noise,
using 2-3 foot cables on either end. We don't have a calibrated antenna, but if
you left the screen room door open just a crack the background radio noise
swamped out the converter's radiated noise.
Conducted noise, however,
was not below the background, particularly in the 10 to 80 MHz band and so I
asked him to do a noise reduction project. It took about a month of his spare
time, but he was able to reduce the noise by a factor of 20 in this band. The
noise at other frequencies was also reduced quite a bit, but he didn't quantify
it.
I have always suspected that manufacturing errors or variations
might explain why some people see low noise and other see high noise. One of
our customers is returning a unit in early 2007 that he has problems with and
we are anxious to take a look at that to see how it performs and how our noise
fixes work with it.
Another answer to this puzzlement may be that some
radios handle conducted noise on the power supply better than others. But there
haven't been enough reports to make any conclusions on this from our
end.
Hopefully more news in the near future.
Reviews of this
product by Ham Radio engineers, showing both high and low noise emissions, are
located here;http://www.eham.net/reviews/detail/4646
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PowerStream
Technologies: 1163 S. 1680 West. Orem Utah
84058
Phone: 801-764-9060
Fax: 801-764-9061 |
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© Copyright 2000,
2002, 2003, 2004, 2005, 2008, 2009, 2010 Lund Instrument Engineering, Inc. All
rights reserved This material is copyrighted original work. It is
forbidden to use this information, text, or graphics in full or in part on
another web site without written permission. This prohibition includes making
derivative text using automatic thesaurus substitution software. |
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