Modular power supply system

A modular power supply system, configured to comprise:

• a main controller, configured to output a main control signal;
• N local controllers, wherein each of the local controllers is configured to receive the main control signal to output at least one local control signal;
• and
• N power units, in one-to-one correspondence with the N local controllers, wherein each of the power units comprises a first end and a second end, and the second end of each of the power units is connected to the first end of an adjacent one of the power units, each of the power units is configured to comprise M power converters, wherein each of the power converters comprises a third end and a fourth end, the fourth end of each of the power converters is connected to the third end of an adjacent one of the power converters, and the third end of a first one of the power converters is connected to the first end of the power unit, the fourth end of an M-th one of the power converters is connected to the second end of the power unit, and each of the power converters is configured to operate according to the local control signal output by a corresponding local controller, wherein both N and M are natural numbers greater than one,
• wherein the same local control signal controls the power semiconductor switches at an identical position in at least two of the M power converters to be simultaneously turned on and off.