Language: 
To browser these website, it's necessary to store cookies on your computer.
The cookies contain no personal information, they are required for program control.
  the storage of cookies while browsing this website, on Login and Register.

GDPR and DSGVO law

Storing Cookies (See : http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm ) help us to bring you our services at overunity.com . If you use this website and our services you declare yourself okay with using cookies .More Infos here:
https://overunity.com/5553/privacy-policy/
If you do not agree with storing cookies, please LEAVE this website now. From the 25th of May 2018, every existing user has to accept the GDPR agreement at first login. If a user is unwilling to accept the GDPR, he should email us and request to erase his account. Many thanks for your understanding

User Menu

Google Search

Custom Search

Author Topic: Voltage step down from solid state full wave rectifier  (Read 2761 times)

Offline magnetman12003

  • Hero Member
  • *****
  • Posts: 854
Voltage step down from solid state full wave rectifier
« on: July 08, 2015, 03:36:01 AM »
My full wave bridge rectifier has an output of 140 volts DC.
How do I decrease the output to 12 volts DC without using a power robbing resistor in
series with the rectifier?


I would like to have as much current as possible-- is there some type of module that can do this job or a simple circuit?


All help greatly appreciated.  If possible hand draw whatever circuit or tell where I can find a module.

Offline MarkE

  • Hero Member
  • *****
  • Posts: 6830
Re: Voltage step down from solid state full wave rectifier
« Reply #1 on: July 08, 2015, 05:00:01 AM »
My full wave bridge rectifier has an output of 140 volts DC.
How do I decrease the output to 12 volts DC without using a power robbing resistor in
series with the rectifier?


I would like to have as much current as possible-- is there some type of module that can do this job or a simple circuit?


All help greatly appreciated.  If possible hand draw whatever circuit or tell where I can find a module.
For power up to about 10W buy and connect a 12V wall wart.  For higher powers buy a 120VAC to 12V power supply.  You will have to check to make sure the supply you buy does not use a voltage doubler style front-end which is unfortunately very common as it allows one design to handle 110/120VAC and 220/240VAC sources.  Supplies that use a doubler have a voltage selection switch.  Supplies that do not use doublers are labeled "universal" and do not have an input voltage selector switch.

Offline TinselKoala

  • Hero Member
  • *****
  • Posts: 13968
Re: Voltage step down from solid state full wave rectifier
« Reply #2 on: July 08, 2015, 06:00:27 AM »
Put a step-down transformer on the AC side of the FWB.