Power converter with automatic balance mechanism of flying capacitor

A power converter with an automatic balance mechanism of a flying capacitor, comprising:

• a switch circuit coupled to an input voltage;
• a flying capacitor connected to the switch circuit;
• an output circuit including an output capacitor and an output inductor, wherein a first terminal of the output inductor is connected to the switch circuit, and two terminals of the output capacitor are respectively connected to a second terminal of the output inductor and grounded;
• an error amplifier having a first input terminal connected to an output node between the output capacitor and the output inductor, and having a second input terminal coupled to a reference voltage, wherein the error amplifier is configured to output an error amplified signal according to an output voltage of the output node and the reference voltage;
• a comparator circuit connected to the error amplifier and configured to compare the error amplified signal with a ramp signal to output a comparison signal, wherein a slope of the ramp signal is proportional to a voltage of the flying capacitor, and a difference between the input voltage and the voltage of the flying capacitor is proportional to the slope of the ramp signal;
• and
• a driving circuit connected to the comparator circuit and the switch circuit, and configured to drive the switch circuit according to the comparison signal.