THREE-WIRE DC-TO-DC CONVERTER AND PARALLEL POWER SUPPLY SYSTEM

This application discloses a three-wire DC-DC converter and a parallel power supply system. The parallel power supply system includes a common wiring busbar, an input wiring busbar, an output wiring busbar, and at least two three-wire DC-DC converters. Each three-wire DC-DC converter includes a DC-DC conversion circuit, an input wiring terminal, an output wiring terminal, and a common wiring terminal. Input wiring terminals of all the three-wire DC-DC converters are connected in parallel to the input wiring busbar, output wiring terminals of all the three-wire DC-DC converters are connected in parallel to the output wiring busbar, and the common wiring terminals of all the three-wire DC-DC converters are connected in parallel to the common wiring busbar. The wiring busbar is configured to connect a first direct current power supply and a load. All the three-wire DC-DC converters convert a voltage of the first direct current power supply into a voltage required by the load and output the voltage, and output currents at the output wiring terminals of all the three-wire DC-DC converters are consistent. This avoids a case in which a DC-DC converter is damaged due to an excessively large return current of the DC-DC converter.