Direct current-direct current conversion circuit

A direct current-direct current conversion circuit, comprising:

• an input inductor, a first capacitor, a second capacitor, a flying capacitor, a first switch, a second switch, a first inductor, a first diode, a first buffer circuit, a third switch, a fourth switch, a second inductor, a second diode, and a second buffer circuit, wherein
• a power supply, the input inductor, the first diode, the second diode, the first capacitor, and the second capacitor are sequentially connected in series, wherein a first terminal of the input inductor is connected to a positive electrode of the power supply, a second terminal of the input inductor is connected to a positive electrode of the first diode, and a negative electrode of the first diode is connected to a positive electrode of the second diode;
• a first branch and a second branch are connected in parallel between the second terminal of the input inductor and a negative electrode of the power supply, the first branch comprises the first switch and the third switch that are sequentially connected in series, the second branch comprises the first inductor, the second switch, the second inductor, and the fourth switch that are sequentially connected in series, and the first switch and the first inductor are both connected to the second terminal of the input inductor;
• a first terminal of the flying capacitor is connected between the first diode and the second diode, a second terminal of the flying capacitor is connected between the first switch and the third switch, and the second terminal of the flying capacitor is further connected between the second switch and the second inductor;
• a first terminal of the first buffer circuit is connected to the positive electrode of the first diode, a second terminal of the first buffer circuit is connected between the first inductor and the second switch, and a third terminal of the first buffer circuit is connected to the negative electrode of the first diode;
• a first terminal of the second buffer circuit is connected to the second terminal of the flying capacitor, a second terminal of the second buffer circuit is connected between the second inductor and the fourth switch, and a third terminal of the second buffer circuit is connected between the first capacitor and the second capacitor;
• the first buffer circuit is configured to transfer energy of the first inductor to the flying capacitor, or to the first capacitor and the second capacitor, when the second switch is disconnected;
• and
• the second buffer circuit is configured to transfer energy of the second inductor to the second capacitor when the fourth switch is disconnected.