Power converter having multi-mode switching mechanism

A power converter having a multi-mode switching mechanism, comprising:

• a switch circuit, including:
• a first switch, wherein a first terminal of the first switch is connected to a first terminal of an inductor, and a second terminal of the inductor is connected to an input power source;
• a second switch, wherein a first terminal of the second switch is connected to a second terminal of the first switch, a second terminal of the second switch is connected to a first terminal of a capacitor, a second terminal of the capacitor is grounded, a node between the first terminal of the second switch and the second terminal of the first switch is used as an output terminal of the power converter;
• and
• a low-side switch, wherein a first terminal of the low-side switch is connected to the first terminal of the first switch, and a second terminal of the low-side switch is grounded;
• an output calculating circuit connected to the output terminal of the power converter, wherein the output calculating circuit is configured to receive an output voltage of the power converter from the output terminal of the power converter, and configured to calculate differences between the output voltage of the power converter and a plurality of reference voltages to output a plurality of feedback calculated signals;
• and
• a control circuit connected to the input power source, a control terminal of the first switch, a control terminal of the second switch, a control terminal of the low-side switch and an output terminal of the output calculating circuit, wherein the control circuit is configured to switch the switch circuit according to the plurality of feedback calculated signals and an input voltage from the input power source such that the power converter is switched between a plurality of modes;
• wherein the control circuit includes:
• an input calculating circuit coupled to a plurality of first power divided voltages that are divided from the input voltage respectively by a plurality of ratios, and configured to output an input calculation logic signal according to a difference between each of the plurality of first power divided voltages and one of the plurality of reference voltages coupled to the input calculating circuit.