Power conversion device

A power conversion device, comprising an input positive terminal, an input negative terminal, an output positive terminal, an output negative terminal and a circuit unit, wherein the circuit unit comprises a first circuit unit and a second circuit unit;

• the first circuit unit and the second circuit unit are electrically connected in parallel and bridged between the input positive terminal and the input negative terminal;
• and each circuit unit comprises an upper switch, a middle switch, a first lower switch, a second lower switch, a three-port magnetic assembly and a flying capacitor;
• the upper switch and the middle switch are electrically connected to an upper node, and the upper switch is bridged between the input positive terminal and the upper node;
• the middle switch and the first lower switch are electrically connected to a first lower node, and the first lower switch is bridged between the first lower node and the input negative terminal;
• the flying capacitor and the second lower switch are electrically connected to a second lower node, the second lower switch is bridged between the input negative terminal and the second lower node, and the flying capacitor is bridged between the upper node and the second lower node;
• the three-port magnetic assembly is electrically connected with the first lower node, the second lower node and the output positive terminal;
• further comprising a group of control signals, wherein the group of control signals comprises a first control signal, a second control signal, a third control signal and a fourth control signal;
• the first control signal is used for controlling turn-on and turn-off of the upper switch of the first circuit unit and the middle switch of the second circuit unit;
• the second control signal is used for controlling turn-on and turn-off of the middle switch of the first circuit unit and the upper switch of the second circuit unit;
• the third control signal is used for controlling turn-on and turn-off of the second lower switch of the first circuit unit and the first lower switch of the second circuit unit;
• the fourth control signal is used for controlling turn-on and turn-off of the first lower switch of the first circuit unit and the second lower switch of the second circuit unit;
• the first control signal and the second control signal are staggered by 180 degrees, the third control signal is complementary to the first control signal, and the fourth control signal is complementary to the second control signal.