Buffer absorption circuit based on multi-level H-bridge circuit and zero-voltage switch implementation method

The invention discloses a buffer absorption circuit based on a multi-level H-bridge circuit, a high-frequency unit is provided with two flying capacitor multi-level circuits, a high-voltage unit comprises an H-bridge circuit, a bipolar RCD buffer absorption circuit and an RC buffer absorption circuit are installed on the input side, the cathode of Ds1 in the bipolar RCD buffer absorption circuit is connected with the anode of Cs1, the anode of Ds2 is connected with the cathode of Cs1, and the cathode of Ds3 is connected with the anode of Cs2. The anode of the Ds1 and the cathode of the Ds2 are respectively connected with the positive pole Xp and the negative pole Xn of the high-voltage unit, the cathode of the Ds1 is connected in series with the Rs1 and then connected to the positive bus P of the high-frequency unit, the anode of the Ds2 is connected in series with the Rs2 and then connected to the negative bus N, and a resistor Rs3 and a capacitor Cs2 in the RC buffer absorption circuit are connected in seri