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I dusted off the SassyClassE sstc for some experimentation, so I thought I’d do a “show and tell” of its components and operation.

Erratum: It’s either efficient, or it’s not. At around 8 minutes I say that the Class E operation is pretty efficient, and then a bit later I say that the system as a whole isn’t. This isn’t really a contradiction; the ClassE switching wastes very little power in the mosfet itself, but the system overall wastes power in heating the secondary, radiating RF and making ozone.

I originally used an IRFP450 but last night I tried the higher-current IRFP460 and it is a bit easier to tune the gate bias with that transistor, so I left it in place for this set.

The basic ClassE driver schematic that I used is here:
http://rfhv.com/images/off%20line%20class%20e%20sch.gif

I’ve never run higher than about 60 volts input though, because I can’t find a 17n80 mosfet in my box.

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I dusted off the SassyClassE sstc for some experimentation, so I thought I’d do a “show and tell” of its components and operation.

Erratum: It’s either efficient, or it’s not. At around 8 minutes I say that the Class E operation is pretty efficient, and then a bit later I say that the system as a whole isn’t. This isn’t really a contradiction; the ClassE switching wastes very little power in the mosfet itself, but the system overall wastes power in heating the secondary, radiating RF and making ozone.

I originally used an IRFP450 but last night I tried the higher-current IRFP460 and it is a bit easier to tune the gate bias with that transistor, so I left it in place for this set.

The basic ClassE driver schematic that I used is here:
http://rfhv.com/images/off%20line%20class%20e%20sch.gif

I’ve never run higher than about 60 volts input though, because I can’t find a 17n80 mosfet in my box.

• Share on Facebook.
• Share on Twitter.
• Share on Google+

I dusted off the SassyClassE sstc for some experimentation, so I thought I’d do a “show and tell” of its components and operation.

Erratum: It’s either efficient, or it’s not. At around 8 minutes I say that the Class E operation is pretty efficient, and then a bit later I say that the system as a whole isn’t. This isn’t really a contradiction; the ClassE switching wastes very little power in the mosfet itself, but the system overall wastes power in heating the secondary, radiating RF and making ozone.

I originally used an IRFP450 but last night I tried the higher-current IRFP460 and it is a bit easier to tune the gate bias with that transistor, so I left it in place for this set.

The basic ClassE driver schematic that I used is here:
http://rfhv.com/images/off%20line%20class%20e%20sch.gif

I’ve never run higher than about 60 volts input though, because I can’t find a 17n80 mosfet in my box.