Universal power supply system

A universal power supply system comprising:

• a housing;
• a backboard module mounted to the housing, and having:
• multiple DC power and communication interfaces, each having a DC power input and output (I/O) port;
• and
• a monitoring circuit electrically connected to the DC power and communication interfaces and having:
• multiple enable terminals;
• multiple current detection terminals;
• multiple specification identification terminals;
• and
• a specification mapping table built therein and storing multiple model numbers and multiple critical current values corresponding to the model numbers;
• multiple AC-to-DC (AC/DC) power supply devices at an input side mounted inside the housing, each AC/DC power supply device having a DC power output terminal connected to the DC power I/O port of one of the DC power and communication interfaces;
• and
• multiple board mounted DC power modules mounted inside the housing, and plugged in corresponding DC power and communication interfaces of the backboard module, each board mounted DC power module having:
• a specification setting circuit;
• a specification setting terminal electrically connected to a corresponding specification identification terminal of the monitoring circuit;
• an enable terminal electronically connected to a corresponding enable terminal of the monitoring circuit;
• and
• a current output terminal connected to a corresponding current detection terminal of the monitoring circuit;
• wherein the monitoring circuit reads a specification identification signal from the specification setting circuit of each board mounted DC power module, identifies a model number according to the specification identification signal and sets a critical current value for over-current protection of the respective board mounted DC power module to the critical current value in the specification mapping table corresponding to the identified model number.