Power supply module and soft start method

A power supply module, comprising:

• at least two Direct Current (DC) buses;
• a capacitor coupled between the at least two DC buses;
• a current limiting circuit including at least one current limiting resistor, the current limiting circuit coupled to at least one of the DC buses;
• a connection terminal having a first detection joint and a second detection joint;
• and
• an input detection circuit coupled to at least one of the first detection joint and the second detection joint and configured to output a first notification signal to a trigger drive circuit when it is determined, by detecting a short-circuit between the first detection joint and the second detection joint, that the power supply module begins to receive a power supply signal;
• the trigger drive circuit configured to wait for a predetermined duration without sending a drive signal to the current limiting circuit when the first notification signal sent from the input detection circuit is received by the trigger drive circuit, and to send the drive signal to the current limiting circuit when the predetermined duration elapses, the predetermined duration determined according to values of the capacitor coupled between the at least two DC buses, and the current limiting resistor of the current limiting circuit;
• and
• the current limiting circuit configured to limit a current on at least one of the DC buses of the power supply module when the drive signal is not received by the current limiting circuit, and not to limit the current on said at least one of the DC buses when the drive signal is received by the current limiting circuit.