Power supply device and power supply system

A power supply system, comprising:

• at least one power supply device, wherein each of the at least one power supply device comprises:
• a main circuit board comprising a first side, a second side, a third side and a fourth side, wherein the first side and the second side are opposed to each other and extended in a first direction, and the third side and the fourth side are opposed to each other and extended in a second direction;
• an input/output module disposed on the main circuit board and located adjacent to the fourth side of the main circuit board;
• a capacitor module located adjacent to the third side of the main circuit board;
• a rectifier module disposed on the main circuit board, wherein the rectifier module is arranged between the input/output module and the capacitor module and located adjacent to the input/output module;
• and
• an EMI module, a first inductor module, a resonant module and a power semiconductor device moule disposed on the main circuit board and arranged between the capacitor module and the rectifier module;
• and
• a liquid cooling plate, wherein a plurality of protrusion structures and a plurality of glue filling grooves are disposed on at least one surface of the liquid cooling plate,
• wherein the at least one surface of the liquid cooling plate where the plurality of protrusion structures and the plurality of glue filling grooves are disposed is attached to the at least one power supply device.