|
Gate Reversal Feedback Resonator
(Sorry for long description)
Like all of the things I post on this app, it doesn’t work in the simulation, but I think that’s just because the simulation doesn’t let LC circuits oscillate through MOSFETs, even though that’s entirely possible in real life. Anyway, here’s how I designed it to work:
The resonant capacitor that’s connected to the inductor gets charged up, then the gate of the MOSFET gets charged up after. The reason it gets charged up after the resonant capacitor is because it has higher a higher RC time constant, mainly because of the 470 ohm resistor. The MOSFET turns on, allowing the LC circuit to discharge/oscillate. There’s also a 10 ohm load resistor between the drain and the 470 ohm resistor just to prevent heating so that there’s not too much current going the MOSFET when it’s on. In the first half-cycle of the oscillations, the part of the LC circuit connected to the 20 nF feedback cap becomes positively charged, making the top part of the feedback cap to become more and more positively charged and the bottom part more and more negatively charged. This negative charge reverses/negates the preexisting positive voltage on the MOSFET gate, turning the MOSFET off. But in the next half cycle, the left part of the resonant capacitor gets charged back up by the 15V source. The part of the resonant cap connected to the feedback cap becomes negatively charged, making the top part of the feedback cap negatively charged. This makes the MOSFET gate positively charged and allows the resonant capacitor to discharge/oscillate through it, and the cycle repeats.
An important thing to note about this circuit is the bottom of the feedback capacitor needs to be isolated from the voltage source in some way so that it only gets feedback from the LC circuit. I wanted to stop the voltage source from going against the direction of the LC oscillations and I wanted the feedback cap to properly discharge the gate of the MOSFET. I decided to use a flyback diode for this so that when the LC circuit is charging itself back up, it can just go through the flyback diode instead of having to go through the MOSFET and against the direction of the voltage source. I also added the feedback cap in between the resonant capacitor and inductor so that it only gets feedback from the LC circuit and doesn’t get effected by the voltage source.
The reason this circuit has the words “Gate Reversal Feedback” is because the feedback capacitor essentially reverses/negates the electric charge on the gate of the MOSFET.
Do you think this circuit will work? This is pretty much the only circuit I’ve made that I think might work, and I’m still pretty new to electronics, so let me know if you think this would work and maybe give some tips too.
|
