I have some ideas with car bateries, but I need to put oscilator ( 600-700 Hz ) to work with them.
I found opto-isolators for 15000V 5A, but nothing stronger ( coversion will not work for me ).
Any sugestions ?
You can try getting some Thyristors (SCRs) or Thyratron tubes and using those since the frequencies are fairly low.
You can try to use an CM600HA-5F IGBT http://www.pwrx.com/pwrx/docs/cm600ha5f.pdf (http://www.pwrx.com/pwrx/docs/cm600ha5f.pdf).
:)
@all
Looks very interesting....but what exactly does it do?
Quote from: amigo on May 10, 2009, 11:41:26 AM
You can try getting some Thyristors (SCRs) or Thyratron tubes and using those since the frequencies are fairly low.
Thanks, I'm looking for GTO type to see if it willl work for me.
Quote from: Montec on May 12, 2009, 04:13:44 PM
You can try to use an CM600HA-5F IGBT http://www.pwrx.com/pwrx/docs/cm600ha5f.pdf (http://www.pwrx.com/pwrx/docs/cm600ha5f.pdf).
:)
I have to see how it works, thanks for advice.
At those low frequencies you could simply parallel some power MOSFETs or Darlingtons, and drive them with Groundloop and Gotoluc's H-Bridge circuit, for fairly low cost.
The IGBT would be the "professional" way to do it, with the correct driver circuit, but at higher cost.
But we are talking serious power here, and your comment about opto-isolators (which are something completely different) makes me wonder...are you confident in your ability to build and handle circuits of that high-power level, safely?
I am.
At this point i'm only getting infoes.
When I check every solution, then I'll decide what to do.
I'm only open minded, who knows what can show up.
rkahler said:
Quote
I have some ideas with car bateries, but I need to put oscilator ( 600-700 Hz ) to work with them.
Any sugestions ?
>>Suppose you use relays with heavy contacts to handle the power? You will get lots of harmonics, however. They can be filter with back-pass and band-reject networks, as needed.
Some of the power supply voltage can be wired through a coil and when it's energized, the coil opens the contacts to break the connection and close the contacts again. Simple. The relay(s) "chatter", but is the easiest thing I can think of.
You can control the rate of coil frequency be varying the voltage with a rheostat.
--Lee
the_big_m_in_ok
Thanks, but my info is that relays can't switch that fast.
rkahler said:
Quote
Thanks, but my info is that relays can't switch that fast.
>>Okay, you might be right. Have you thought of the
very large push-pull inverter?
Oscillators don't get much simpler than that. You can vary the frequency with the value of the base resistor on the transistors, right?
--Lee
Thanks for idea, will be looking over it.
At this point I'm only brainstorming the concept, I'm working on something else.
When I'm done with current project, I'll start checking yours suggestions.
why that particular frequency?
I'm trying to apply Tesla switch on car batteries.
Over 800 Hz - strange effects ( so they say ).
Below 500 Hz - not efficient.
use a tone generator and half wave rectification from the output of a headphone jack and you can turn a transistor on and off quite effectively.
but, you will have to double the frequency on half wave to get the desired frequency.
Quote from: rkahler on May 27, 2009, 07:56:10 PM
I'm trying to apply Tesla switch on car batteries.
Over 800 Hz - strange effects ( so they say ).
Below 500 Hz - not efficient.
You should get results at a lower switching rate, 100Hz.
but the classic proposals do not call for such complications.
Have you seen this?:
http://www.free-energy-info.co.uk/Chapter5.pdf
Paul.
Yes, I did.
600 Hz looks to me like optimal value.
I'll test lower and higher values just to see what will I get.
rkahler said:
Quote
I'm trying to apply Tesla switch on car batteries. Over 800 Hz - strange effects ( so they say ). Below 500 Hz - not efficient.
>>Was there a reason given for that? I hadn't heard of that.
--Lee
OK, exact freq is below 100 Hz, I just thought to keep up a bit.
Look at http://www.free-energy-info.co.uk/Chapter5.pdf, page 6.
If you want to switch high current DC very quickly (assuming 1 direction only), I would suggest using a high power MOSFET such as the International Rectifier IRFS3107-7PPBF
This MOSFET is rated at 75 Volts and can switch on 260 Amps in 17 nanoseconds.
Of course, to switch 500 Amps, you would need to wire two (or three for extra margin) of these in parallel.
Probably won't be your cheapest option, but IRF makes great components.
IRFS3107-7PPBF
Datasheet:
http://www.irf.com/product-info/datasheets/data/irfs3107-7ppbf.pdf