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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
the reson I asked is because I would like to modulate standard audio. this is just picking peoples brain about an idia that I had. Audio has two components, varing frequency and amplitude. The part of modulation that has been done is varying the frequency or the gate time for the bridge witch can be greate for musical composures. my quesion is this if the amplitude part is added will the fidelity be good enough for voice? Is it even pausible with a DRSSTC ? I can build a circuit that will controle pulse width and gating witch I may try provided that the harmonic distortion from a pulse width variation to the primary won't cause to much harmonic distortion in the tesla. From what I am hearing and my obsevations this may be the case. If I use primary feadback changing the width feeding the gates will amplifie and feedback the harmoncis from the primary and secondary into the controle electronics witch would be bad but if I filter the fundimental that would be good. With a SSTC the fundimental is astablished and the harmonics would be there but supressed. does this make sence?
Registered Member #2478
Joined: Mon Nov 23 2009, 03:24AM
Location: Texas A&M University
Posts: 47
DRSSTCs almost always include an interrupter. The interrupter PWMs the inverter at a very low duty cycle in the audio range, allowing the inverter to run at very high peak currents. This is pretty much incompatible with audio reproduction. You can play tones, but that's about it.
If you wanted to amplitude modulate the output, you'd need to run CW, with a high impedance primary tank. Instead of an MMC, you could probably use a few big mica transmitting capacitors, rated for many kV and several kVAR.
At that point however, you could save on capacitors by just driving the secondary directly, with a tightly coupled ferrite core impedance matching transformer. This is similar to the magnifier arrangement. I have not been able to test this method, but I have a transformer from one of those switchmode microwave ovens laying around for when I have time.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
thanks Russell and GeordieBoy, perhaps modulating the rails might be the way to go but trying that on a linear platform would be hard to do. maby a form of pulse width modulation and carier and filtering might work. Some amps such as those 2000 watt power amps for cars witch I believe is class D use this kind of modulation around. They run in the 30 to 250 hz range N.B.
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AM modulation by pulse width controle
