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The interrupter generates the signal which drives the resonant circuit (coil rig) at its resonant frequency $f_0$. As long as the input signal X2 is active the output is driven at the resonant frequency $f_0$. It does this by the means of a positive feedback loop. The feedback signal X8 is retrieved with a sensing transformer around the output wire from the power amplifier, before being clamped, rectified, and schmidt triggered. The positive flanks of this signal represents when the output current passes zero (this is when we want to switch the polarity of the output). This signal is fed to the output via gates controlled by a latch, the signal to one of the outputs is inverted (for push-pull operation).
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The interrupter generates the signal which drives the resonant circuit (coil rig) at its resonant frequency $f_0$. As long as the input signal X2 is active the output is driven at the resonant frequency $f_0$. It does this by the means of a positive feedback loop. The feedback signal X8 is retrieved with a sensing transformer around the output wire from the power amplifier, before being clamped, rectified, and schmidt triggered. The positive flanks of this signal represents when the output current passes zero (this is when we want to switch the polarity of the output). This signal is fed to the output via gates controlled by a latch, the signal to one of the outputs is inverted (for push-pull operation).
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