Vehicle-mounted power supply apparatus and vehicle

A vehicle, comprising:

• a first-type load;
• a battery;
• and
• a vehicle-mounted power supply apparatus comprising:
• a power conversion circuit comprising:
• a power port configured to receive power from an external power supply,
• a first direct current port configured to output a first direct current,
• a second direct current port configured to output a second direct current, wherein a voltage of the second direct current port is higher than a voltage of the first direct current port,
• an upper-layer printed circuit board (PCB) electrically connected to the second direct current port, and
• a lower-layer PCB electrically connected to the first direct current port and to the power port;
• a bottom housing;
• and
• a heat sink, wherein the lower-layer PCB, the upper-layer PCB, and the heat sink are sequentially stacked in and fastened to the bottom housing, wherein the first direct current is configured to be transmitted to the first-type load for supplying power, and the second direct current is configured to be transmitted to the battery for supplying power, and a voltage of the second direct current port is configured to be higher than a voltage of the first direct current port.

A method of operating an apparatus, comprising a power conversion circuit comprising a power port, a first direct current port, a second direct current port, an upper-layer printed circuit board (PCB) electrically connected to the second direct current port, and a lower-layer PCB electrically connected to the first direct current port and to the power port;

• a bottom housing;
• and a heat sink, wherein the lower-layer PCB, the upper-layer PCB, and the heat sink are sequentially stacked in and fastened to the bottom housing, the method comprising:
• receiving power, by the power port, from an external power supply;
• outputting a first direct current by the first direct current port;
• and
• outputting a second direct current by the second direct current port, wherein a voltage of the second direct current port is configured to be higher than a voltage of the first direct current port.