Dc-dc converter

A DC-DC converter, characterized by comprising:

• an inductor, a rectifier module, a first bridge arm topology and a second bridge arm topology and a third bridge arm topology in parallel as well as a capacitor, wherein the first bridge arm topology includes a first switching tube and a fourth switching tube in series, the second bridge arm topology includes a second switching tube and a fifth switching tube in series, and the third bridge arm topology includes a third switching tube and a sixth switching tube in series;
• a negative pole of the first bridge arm topology is connected to a negative pole of the second bridge arm topology, and the inductor has one end connected to a coupling point formed by connecting the first switching tube and the fourth switching tube in series, and the other end connected to a coupling point formed by connecting the second switching tube and the fifth switching tube in series;
• an input end of the rectifier module has one end connected to the coupling point formed by connecting the second switching tube and the fifth switching tube in series, and the other end connected to a coupling point formed by connecting the third switching tube and the sixth switching tube in series, and the rectifier module is used to convert an alternating current into a direct current;
• there is a phase difference between a control signal of the second bridge arm topology and a control signal of the third bridge arm topology;
• the first bridge arm topology and the inductor constitute a Buck converter for stepping down an input voltage, the second bridge arm topology and the inductor constitute a Boost converter for stepping up an input voltage, and the second bridge arm topology, the third bridge arm topology and the rectifier module constitute a phase-shifted full-bridge converter for stepping down or stepping up an input voltage;
• the DC-DC converter multiplexes the inductor and the second bridge topology.