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I am currently in tage of looking best switch for my TC. It is working at appx. 400kHz, and 40V (i am planning to use it on 200V) and it is fed from TTL output.
Which one would be best, or with which one you have good performance?
Currently i am looking from one of those: BUP212 IGBT 22A/1200V TO220 (only this IGBT i can buy, so other should be mosfets)
IRL540N Logic level mosfet 100V 36A TO220 RdsON 0,044ohm (can be driven directly from TTL output which looks great (as they say))
I was using few ones, IRFS630A, IRF540, IRF510 and they had performance in order as they are written (IRFS had best). I also tried IRFPE30, CEF026N and SSS7n60, but performance poor or none.
Thanks for responses. //edit - as i see, the input capacitance for IRL is 1800pF, that is too high value, isn´t it? I had problems drive 500pF IRF510, but 600pF IRFS630A was good, so i dont know.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
dingo27 wrote ...
I am currently in tage of looking best switch for my TC. It is working at appx. 400kHz, and 40V (i am planning to use it on 200V) and it is fed from TTL output.
Which one would be best, or with which one you have good performance?
Currently i am looking from one of those: BUP212 IGBT 22A/1200V TO220 (only this IGBT i can buy, so other should be mosfets)
IRL540N Logic level mosfet 100V 36A TO220 RdsON 0,044ohm (can be driven directly from TTL output which looks great (as they say))
I was using few ones, IRFS630A, IRF540, IRF510 and they had performance in order as they are written (IRFS had best). I also tried IRFPE30, CEF026N and SSS7n60, but performance poor or none.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi guys,
I found what looks like a great mosfet for SSTC:
Seeing there are many of newcomers you could do a group buy and even reduce the price further. Just be careful with blowing them up...
I would not recommend any kind of single-switch topology to be used for a high power SSTC at low frequencies.
Probably the biggest problem I see is general lack of easy, working circuits that can be used as they are. Probably the only circuit in existence that is without major flaws is Steve Ward's 4046 PLL circuit, which is still *hidden* on his site. I hoped Steve would put it on pages but he never accessed his site since then.
PS. oh, and I assume this thread would really belong more to Tesla Coil forum?
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Yeah, with class E and a MOSFET with low Rds(on) resistance (<100mOhm) you should be able to get minimal losses. I think you should focus more on the gate driver than the MOSFET itself. There are very few MOSFETs which can be driven from TTL signal at 400kHz. First, you need to step up the voltage to 12 volts. That is usually needed to fully turn on a power MOSFET. (There are a few exceptions, though.) Second, you need to have a gate drive stage which has high current capacibility. It can be done like this: So, what this circuit does: The class A amplifier stage with the BS170 and 100 ohm resistor steps up the voltage from the 5V logic level to 12V. Note that this inverts the output, though! Then there's a class B push pull with BD139/40 to get enough gate drive current. This push pull pair can't amplify voltage, so that's why the class A stage is needed.
whoah, thanks for all responses, but i cant get any other parts as on , because it vould be difficult and expensive to buy from another country.
As i think, my basic ttl driver is really great, but it only needs more power to switch mosfets. I tried paralleling TTL to get more Amps, doing amplifier with some chips. but as i found (at least) mosfet driver, i am soo happy. It is IR2111PBF from IR (DIP8), or those from IR2110PBF dip14 IR2125PBF dip8
but i am looking for that 2111, is there anybody who had experience (good experience) with that? Because if i had good mosfet driver, i can power my fullbridge (which was ready time ago, but cant be driven) from IRF540 (or half of them...) and i also cant buy all of them because they are expensive here
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Best switch for TC
