All About Circuits Forum Multiplying a DC voltage without a transformer?
 Register Blogs FAQ Members List Today's Posts Search Today's Posts Mark Forums Read

 General Electronics Chat Discussion forum for general chat about anything electronics related, including asking questions about material in the All About Circuits E-book, Worksheets, and Videos.

#1
11-29-2009, 01:49 AM
 electronice123 Senior Member Join Date: Oct 2008 Posts: 231
Multiplying a DC voltage without a transformer?

I know an AC voltage can be multiplied and converted to a high dc voltage using a voltage multiplier.

Is there any way to multiply a DC or pulsed DC voltage to say 20kV without the use of a transformer???
#2
11-29-2009, 01:56 AM
 SgtWookie Expert Member Join Date: Jul 2007 Location: In the vast midwest of the USA; CST Posts: 22,043

Going from a low voltage to 20kv wouldn't really be practical without the use of a transformer.

You could use switched capacitor networks to boost DC, but it certainly would take a while, and you'd lose power in the switching/charging/etc.
__________________
General info:
If you have a question, please start a thread/topic. I do not provide gratis assistance via PM nor E-mail, as that would violate the intent of this Board, which is sharing knowledge ... and deprives you of other knowledgeable input.
#3
11-29-2009, 02:27 AM
 electronice123 Senior Member Join Date: Oct 2008 Posts: 231

OK. I was just wondering because I have never seen or heard of any other way than by using a transformer. Seems to me it would be just as easy to use a small inverter and voltage multiplier, or a transformer like you mentioned.

Thanks!
#4
11-29-2009, 03:06 AM
 SgtWookie Expert Member Join Date: Jul 2007 Location: In the vast midwest of the USA; CST Posts: 22,043

Well, you can use switched inductors in a boost configuration to go up maybe 20x or so your input voltage pretty easily. But if you want to go from 12v to 20kv, that's really a different ballgame.
__________________
General info:
If you have a question, please start a thread/topic. I do not provide gratis assistance via PM nor E-mail, as that would violate the intent of this Board, which is sharing knowledge ... and deprives you of other knowledgeable input.
#5
11-29-2009, 03:21 AM
 Bill_Marsden Super Moderator Join Date: Mar 2008 Location: Dallas, TX (GMT-5 w/ DST) Posts: 19,069 Blog Entries: 5

And you can use a diode multiplier for lower increases, like X2 or X3. It requires a switching oscillator though, but that is an easy option nowadays.
__________________
..
"Good enough is enemy of the best." An old engineering saying, Author unknown.

General info:
If you have a question, please start a thread/topic. I do not provide gratis assistance via PM nor E-mail, as that would violate the intent of this Board, which is sharing knowledge ... and deprives you of other knowledgeable input. Thanks for the verbage Wookie.
#6
11-29-2009, 03:41 AM
 ifixit Senior Member Join Date: Nov 2008 Location: Ontario, Canada Posts: 595

[QUOTE=Is there any way to multiply a DC or pulsed DC voltage to say 20kV without the use of a transformer???[/QUOTE]

Yes. Use a vandegraaff generator that uses a DC motor to run the belt.

Good Luck.
#7
04-09-2010, 09:50 PM
 GAMAL YONES New Member Join Date: Feb 2010 Posts: 1

dear friends

how can i calculate the value of capacitance and capacity of diode which use for voltage doubler

many thanks
gamal yones
#8
04-09-2010, 11:23 PM
 Bychon Senior Member Join Date: Mar 2010 Location: Florida Posts: 469

LOL! The Van De Graff generator is a perfectly reasonable answer, considering nobody said how much current was needed. Thanks. Your imagination struck me as funny and I appreciate a laugh.

 Related Site Pages Section Title Worksheet Basic AC-DC power supplies Worksheet Advanced electromagnetism and electromagnetic induction Textbook AC voltmeters and ammeters : Ac Metering Circuits Textbook Electrical isolation : Transformers Textbook Special transformers and applications : Transformers Textbook Square wave signals : Mixed-frequency Ac Signals Textbook Input and output coupling : Bipolar Junction Transistors Textbook What is alternating current (AC)? : Basic Ac Theory Textbook Rectifier/filter circuit : Discrete Semiconductor Circuits Textbook Voltage multipliers : Diodes And Rectifiers

 Similar Threads Thread Thread Starter Forum Replies Last Post will1234 General Electronics Chat 0 11-04-2009 10:37 PM hobbyist General Electronics Chat 0 10-09-2009 06:50 AM Petrucciowns Homework Help 52 07-10-2009 05:30 PM atferrari Embedded Systems and Microcontrollers 3 06-19-2009 07:53 AM Bhargavkr The Projects Forum 2 06-18-2009 07:50 AM

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Electronics Forums     General Electronics Chat     The Projects Forum     Homework Help     Electronics Resources Software, Microcomputing, and Communications Forums     Programmer's Corner     Embedded Systems and Microcontrollers     Computing and Networks     Radio and Communications Circuits and Projects     The Completed Projects Collection Abstract Forums     Math     Physics     General Science All About Circuits Commmunity Forums     Off-Topic     The Flea Market     Feedback and Suggestions

All times are GMT. The time now is 10:59 PM.