Switching power supply circuit structure

A switching power supply circuit structure, comprising:

• an input terminal, which is connected in parallel with an input capacitor;
• an output terminal, which has a positive terminal and a negative terminal;
• an energy storage capacitor, which is electrically connected between the positive terminal and a ground terminal;
• a boost circuit, comprising a first inductor, a switch component, and a diode, wherein one end of the first inductor, the switch component and the diode are electrically connected to each other to form a common point, and the switch component is electrically connected between the common point and the ground terminal;
• and
• a second inductor, which is electrically connected between the negative terminal and the common point, wherein the negative terminal is not connected to the ground terminal;
• wherein when the switch component is turn on, the first inductor, the switch component, and the ground terminal form a first series circuit to charge the first inductor, while the energy storage capacitor forms a second series circuit through the output terminal and the switch component to charge the second inductor.