First, use LM311 plus positive feedback resistors and power buffer driver stages to form a high-power hysteresis comparator, and then add an RC integral negative feedback loop to generate self-excited oscillations whose pulse width and frequency are modulated by the input voltage. In order to eliminate the resonance of the output filter and improve the frequency response characteristics, a small capacitor is connected between the output and inverting ends of the LC filter for advance compensation.
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