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1. A power conversion circuit, comprising: a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal, wherein the negative input terminal is electrically connected to the negative output terminal and is grounded; a switch bridge arm, comprising at least one three-switch unit, wherein the at least one three-switch unit comprises a first terminal, a second terminal, a third terminal, an upper switch, a middle switch and a lower switch, the upper switch, the middle switch and the lower switch are electrically connected in series between the first terminal and the third terminal sequentially, the first terminal is electrically connected to the positive input terminal, and the upper switch and the lower switch are turned on and off synchronously; a first grounding switch, coupled between the third terminal and the negative input terminal; a first cross-connected storage capacitor, having a first terminal electrically connected to the upper switch and the middle switch and a second terminal electrically connected to the third terminal; and a first floating driving circuit, comprising a first floating driving diode, a first floating driving capacitor and a first floating driving unit electrically connected in series between a first terminal of the upper switch and a first terminal of the lower switch sequentially one after another, a first connection node connecting the first floating driving diode and the first floating driving capacitor is further electrically connected to a driving terminal of the upper switch, and a second connection node connecting the first floating driving capacitor and the first floating driving unit is further electrically connected to a driving terminal of the lower switch.
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