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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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Custom design and manufacture of
state-of-the-art battery chargers, DC output UPS, and power supplies for OEMs
in a hurry!
Retail or Wholesale, buy
online!
Regulates the voltage and keeps computers and other
equipment from turning of during car starting and other voltage
sags
These are
Boost Converters. You can specify any fixedoutput voltage from 13.8 to
24 volts with a minimum order of 10 pieces. For your convenience for small
quantity and prototyping needs we stock an adjustable version of the
SR700 that runs from 15 to 24 volts which can be bought with a minimum of one
piece. This adjustable dc/dc converter (PST-SR700-adjustable) has a front panel
knob to adjust the current, 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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Out of stock until mid-late August
2008
PST-DC/2812-8 (formerly PST/DC1212-8) Isolated
Buck-boost
$144.76
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% |
| 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 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 Technology:
140 South Mountainway Drive, Orem Utah 84058
Phone: 801-764-9060, 9062, 9063, or 9064
Fax: 801-764-9061 |
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PowerStream Technology
140 South Mountainway Dr.
Orem, UT 84058
Phone: 801-764-9060, 9062, 9063, or 9064, 9062, 9063, or 9064
Fax:
801-764-9061
Map &
Directions |
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© Copyright 2000,
2002, 2003, 2004, 2005, 2008 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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