Series capacitor buck converter with precharge circuit

A series capacitor buck converter with a precharge circuit, comprising:

• a power conversion unit, comprising a first half bridge unit, a second half bridge unit, a series capacitor and an output inductor, wherein a first high side switch device unit, the series capacitor, and a first low side switch unit are sequentially connected in series to form the first half bridge unit, a connection point between the series capacitor and the first low side switch unit being a first switch node, and a connection point between the series capacitor and the first high side switch unit being a series capacitor node;
• a second high side switch device unit and a second low side switch unit are connected to form the second half bridge unit, a connection point between the second high side switch device unit and the second low side switch unit being a second switch node, the first high side switch unit and the second high side switch unit being respectively connected to an input positive electrode and the series capacitor node, and the first low side switch unit and the second low side switch unit being connected to an input negative electrode;
• one end of a first output inductor and a second output inductor is respectively connected to the first switch node and the second switch node, and the other end thereof is connected to an output positive electrode;
• a switch control unit, configured to control the switch on and off of a switch unit in the power conversion unit to achieve power conversion;
• and
• a capacitor precharge circuit, comprising a capacitor voltage detection circuit configured to detect a voltage at both ends of the series capacitor, and a capacitor charge circuit configured to precharge the series capacitor through a charge switch device in a pulse width modulation control mode.