• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Generating +/- 170VDC From 120Vac

Status
Not open for further replies.

Scubasteve

New Member
Hey all,

I want to generate + and - 140-170Vdc via an ac outlet. I know that you can use the standard bridge rectifier to get this straight from the AC outlet with some filter caps to get the 170Vdc positive max. output. I need a -170Vdc supply that will have a ground reference the same as the +170Vdc. I don't want to use a transformer whatsoever, because of the cost factor. I need approx. 1.5-2A continuous at these voltages, so you can imagine the cost of using a centertapped 220Vac transformer.

Can I use a bridge rectifier and reference the positive output (negative side) to ground of the positive 170Vdc, will this give me the negative voltage? Or will it blow up in my face :shock:

Thanks a lot!!!,

Steve
 

Sebi

Active Member
First: be careful, without transformer all components of Your circuit on mains voltage, and 0V not equal to GND!
Fig1 a crop from computer supply circuit, Fig2 the voltage doubler circuit,equal the Fig1 if switch in 110V position.
 

Attachments

Chippie

Member
Errm, in the lower picture,

the diode at the bottom is the wrong way round, the cathode should be connected to the anode of the upper diode, effectively they are in series, then the common point is connected to the AC supply...
 

Scubasteve

New Member
First of all, thanks Sebi and Chippie for your help, it is appreciated!

I will be doing some simulation in PSpice in order to determine the ripple and the values needed for the capacitors and resistors.

Thanks again!

Steve
 
Status
Not open for further replies.

EE World Online Articles

Loading
Top