high power low cost electronic switches - Electronic Circuits Projects Diagrams Free

jumbodaddy · 8th March 2008, 07:44 PM

to who so ever:I am from the world of high powered SCRs. Is there any difference between IGBTs and GTOs(not cars)please explain the difference if any. What are the highest current devices with the lowest cost per device now available quickly? thank you

blueroomelectronics · 8th March 2008, 07:55 PM

SCRs are great, but they can't be turned off once on unless you remove the power; great for an AC source.

jumbodaddy · 8th March 2008, 08:00 PM

yea I know What's the difference between an IGBT and a GTO?

**Nigel Goodwin** · 8th March 2008, 08:02 PM

Quote:

Originally Posted by blueroomelectronics

but they can't be turned off once on unless you remove the power.

Not exact true Bill, they need the current through them to drop below their holding current - and their's no need to remove the power to do that.

Standard speed control on forklift trucks, milk floats, and dodgem cars is by SCR using a DC power supply - simply use a capacitor to turn the SCR off.

jumbodaddy · 8th March 2008, 08:13 PM

I still haven' figuered out how to use your message board please tell me where to look for any answers to my questions

**Nigel Goodwin** · 8th March 2008, 08:14 PM

Quote:

Originally Posted by jumbodaddy

I still haven' figuered out how to use your message board please tell me where to look for any answers to my questions

Fairly obviously here in the thread where you asked it, but why not just use google to find the answers yourself?.

blueroomelectronics · 8th March 2008, 09:31 PM

Quote:

Originally Posted by Nigel Goodwin

Not exact true Bill, they need the current through them to drop below their holding current - and their's no need to remove the power to do that.

Standard speed control on forklift trucks, milk floats, and dodgem cars is by SCR using a DC power supply - simply use a capacitor to turn the SCR off.

Hmm how do you hook up a cap to the motor so it eventually turns off the current?

**Nigel Goodwin** · 9th March 2008, 12:28 PM

Quote:

Originally Posted by blueroomelectronics

Hmm how do you hook up a cap to the motor so it eventually turns off the current?

It's a standard technique, you switch the capacitor across the SCR, this momentarily shorts the SCR out, reducing it's current to zero, switching it off. It's normally done using two SCR's, with the capacitor connected between them, one is the motor driver, the other is just used to switch the capacitor across the first one. Bit like a flip/flop, as one SCR turns ON it turns the other one OFF via the capacitor - which is actually reverse charged as well.

blueroomelectronics · 9th March 2008, 04:08 PM

That's pretty neat.

**Nigel Goodwin** · 9th March 2008, 06:18 PM

Quote:

Originally Posted by blueroomelectronics

That's pretty neat.

Much as I would love to claim credit for it, it's as old as SCR's themselves.

Hero999 · 10th March 2008, 10:29 AM

To anwser the question, GTO SCRs is an anti-SCR comment. It means Get The F*ck Out SCRs, we hate you!

No seriously, it means Gate Turn Off, a GTO SCR will turn off when the gate voltage drops below the cathode voltage by a certain amount and a normaly SCR won't

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Latest
LCD Display	karenhornby	Electronic Projects Design/Ideas/Reviews	27	22nd February 2008 07:42 PM
power electronic e-books	tsoupl	General Electronics Chat	3	27th November 2003 07:12 PM
very high power output radio-cd player portable	franz	Electronic Projects Design/Ideas/Reviews	1	31st May 2003 09:31 PM
MOSFET battery power switches -- can't find any I need	Brocktune	Datasheet/Parts Requests	3	23rd May 2003 03:09 PM
Power reduction for electronic dummie	JBP	General Electronics Chat	3	9th February 2003 08:34 AM

8th March 2008, 07:44 PM	(permalink)
jumbodaddy	high power low cost electronic switches to who so ever:I am from the world of high powered SCRs. Is there any difference between IGBTs and GTOs(not cars)please explain the difference if any. What are the highest current devices with the lowest cost per device now available quickly? thank you

8th March 2008, 07:55 PM	(permalink)
blueroomelectronics	SCRs are great, but they can't be turned off once on unless you remove the power; great for an AC source. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

8th March 2008, 08:00 PM	(permalink)
jumbodaddy	yea I know What's the difference between an IGBT and a GTO?

8th March 2008, 08:13 PM	(permalink)
jumbodaddy	I still haven' figuered out how to use your message board please tell me where to look for any answers to my questions

9th March 2008, 04:08 PM	(permalink)
blueroomelectronics	That's pretty neat. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

10th March 2008, 10:29 AM	(permalink)
Hero999	To anwser the question, GTO SCRs is an anti-SCR comment. It means Get The F*ck Out SCRs, we hate you! No seriously, it means Gate Turn Off, a GTO SCR will turn off when the gate voltage drops below the cathode voltage by a certain amount and a normaly SCR won't __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez