Power supply system and method of controlling the same

A power supply system, comprising a plurality of power modules for supplying power to a load, and each power module comprising:

• a conversion circuit, configured to provide an output current according to a modulation signal, and provide the output current to a power bus through an output end and supply the output current to the load through the power bus,
• a current sensing unit, coupled to the output end, and configured to sense the output current to generate a first voltage level,
• a signal amplifying unit, coupled to the current sensing unit, and configured to provide an amplified signal according to the first voltage level,
• a current sharing unit, coupled to the signal amplifying unit, and configured to receive the amplified signal, and
• a controller, coupled to the current sensing unit, the signal amplifying unit, and the current sharing unit, and configured to adjust the modulation signal according to the amplified signal,
• wherein the current sharing unit of each power module is commonly connected to a common-connected point of a signal bus to generate a second voltage level at the common-connected point;
• the controller acquires a first ratio according to a full-load output power of the conversion circuit corresponding to the controller and the full-load output power of the power module capable of outputting the maximum power, adjusts the first voltage level according to the first ratio and the second voltage level to adjust the amplified signal by adjusting the first voltage level, and adjusts the output current to a target value corresponding to the first ratio by adjusting the amplified signal.