Resonant switching power converter

A resonant switching power converter, which is configured to operably convert an input voltage to an output voltage;

• the resonant switching power converter comprising:
• a plurality of capacitors;
• a plurality of switches, which are coupled to the plurality of capacitors, wherein the plurality of switches are configured to operably switch electrical connection relationships of the plurality of capacitors;
• at least one charging inductor, which is connected in series to at least one of the plurality of capacitors;
• at least one discharging inductor, which is connected in series to at least one of the plurality of capacitors;
• and
• a pre-charging circuit, wherein when the resonant switching power converter operates in a pre-charging mode, the pre-charging circuit being configured to operably control a first switch of the plurality of switches, so as to control an electrical connection relationship between the input voltage and a first capacitor of the plurality of capacitors, and being configured to operably control other switches of the plurality of switches, so as to control the plurality of capacitors to be connected in parallel to one another or to be connected in series to one another, so that when a voltage drop across the first capacitor is lower than a predetermined voltage, a voltage drop across each capacitor is charged to the predetermined voltage;
• wherein the first switch is electrically connected between the input voltage and the first capacitor;
• wherein in a resonant voltage conversion mode, a charging operation signal and at least one discharging operation signal are generated to operate the plurality of switches, so as to switch electrical connection relationships of the plurality of capacitors, such that after the pre-charging mode ends, the resonant switching power converter subsequently operates in the resonant voltage conversion mode to convert the input voltage to the output voltage;
• wherein in the resonant voltage conversion mode, the charging operation signal and the at least one discharging operation signal have respective ON periods which do not overlap one another, so that a charging process and at least one discharging process do not overlap each other;
• wherein in the charging process, the charging operation signal is configured to operably control the plurality of switches, so that a series connection of the plurality of capacitors and the at least one charging inductor is formed between the input voltage and the output voltage, to form a charging path;
• wherein in the at least one discharging process, the at least one discharging operation signal is configured to operably control the plurality of switches, so that a series connection of each capacitor and one of the at least one discharging inductor is formed between the output voltage and a ground voltage level, to simultaneously or sequentially form a plurality of discharging paths;
• wherein the charging process and the at least one discharging processes are arranged in a repeated, alternating manner, so as to convert the input voltage to the output voltage.