Switched capacitor converter and control method

A switched capacitor converter comprising:

• a first energy storage branch comprising a first capacitor, a first switch, a second switch and a third switch;
• a second energy storage branch comprising a second capacitor, a fourth switch, a fifth switch and a sixth switch, wherein an output terminal is one of common nodes of the first energy storage branch and the second energy storage branch;
• a third energy storage branch comprising a third capacitor, a seventh switch, an eighth switch, a ninth switch and a tenth switch, wherein:
• a third terminal of the seventh switch and a second terminal of the ninth switch is connected to a first terminal of the third capacitor;
• a second terminal of the third capacitor is connected to a third terminal of the tenth switch and a second terminal of the eighth switch;
• a third terminal of the eighth switch is connected to an input terminal;
• a second terminal of the seventh switch is grounded;
• a third terminal of the ninth switch is coupled to the first switch;
• and
• a second terminal of the tenth switch is coupled to the fourth switch;
• and
• a control branch connected to a first terminal of each switch in the first energy storage branch, the second energy storage branch and the third energy storage branch respectively, wherein the control branch is configured to control each switch to alternately turn on and off periodically in two phases, so that a ratio of a voltage at the input terminal to a voltage at the output terminal is 2N:1, where N is an integer greater than 1.