|
 |
Circuits designed by David Johnson, P.E.
Last Updated on:
Monday, December 25, 2017 02:08 PM
List of Dave's Circuit Designs
The contents & graphics of
Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB SITE
server |
|
|
|
|
|
|
More
AC to AC Converters |
|
Isolation
Transformer Circuits
May 26, 2011 |
|
Isolation
Transformer Circuits
A while back I needed
to test a circuit at 240vac. Since I needed to safely test the circuit using my
oscilloscope, I needed the 240vac to be fully isolated from the power line. So,
to step up the voltage, I bought a small isolation transformer from Digikey.
This device is made by Triad and has four separate windings. As shown below this
transformer can be wired up in several different configurations to either provide a
1:1 isolated voltage conversion or it can step up the 120vac input voltage to 240vac
or even 360vac. |
|
|
 |
When used on
240vac power lines, it can also provide a 1:1 voltage conversion or drop the voltage
down to 120vac. The toroidal core I bought was only good for 25va but other larger
transformers can also be purchased. In addition to traditional step-up and
step-down applications, the toroidal style core can be useful when you need high AC
current at a low voltage. A few turns of heavy gage wire around the core can
produce 10 Amps of AC current or more. Years ago I had to test a current
transformer circuit at 100 Amps AC and used a larger toroidal core with a few very
heavy gage wires around the core. |
|
|
|
Click
on Drawing Below to view PDF version of Schematic |
|
 |
| |
|
|
