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Advanced calc wireless power oscillator - worse condition case - change simulation speed for better calculation - copy
A modification to royal oscillator and I believe it is the best approach to almost all diy switching projects such as wireless power transfer as the one demonstrated here.
The circuit, on my experience that will work will, must be 1. Self regulated high efficiency oscillating and free of microcontrollers, although logic gates are fine. 2. Allow separate control with gate drive of main mosfets, so it is tweakable. 3. Easy to tinker and adjust for different coupling coefficients with the feedback coil, meaning the feedback coils must NOT be an enclosed transformer, and 4. MOST IMPORTANTLY it must NOT rely on power capacitor to generate resonance like ZVS, because ZVS like designs are insufficient for extremely dynamic self regulation required for Tesla coil/wireless power transfer/ induction heating. ZVS tunes itself based on LC constant - where L is variable inductance work coil -so it often work great at no load, and pop at high load- or extremely inefficient/unstable/over-voltage pop at low load, and nicely at high load. We must leverage the higher power-> more drive nature of purely output+load+delay approach to generate gate drive signals. The added benefit is that coils are much cheaper and easier to make in most labs.
In this demo, you can clearly see, the opamp feedback path forcefully overpower the resonant capacitor’s natural frequency at low load-> higher frequency-> lower power
The comparator opamps can be super cheap audio amplifier chips like TDA 2003 or 2030 ect- for lower frequencies- you get the significant added benefits of overcurrent/heat protection, high current drive gate below 0v, drive igbt, drive capacitive load, ect. Much better than trying to draw gate drive power from coils and doing iffy tricks to condition it.
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