Power supply circuit for hard disk backplane and server system using same

A server system, comprising:

• at least one server;
• an adapter board electronically coupled to the at least one server;
• a first hard disk drive group;
• a second hard disk drive group;
• a hard disk backplane electronically coupled to the adapter board and configured to supply the first hard disk drive group and the second hard disk drive group, the hard disk backplane comprising a power supply circuit, the power supply circuit comprising:
• a first power input terminal receiving a first voltage and outputting the first voltage to supply power to the first hard disk drive group;
• a second power input terminal receiving the first voltage and outputting the first voltage to supply power to the second hard disk drive group;
• a first switch circuit electronically coupled between the first power input terminal and a second power input terminal;
• and
• a control voltage output terminal for receiving a control voltage and controlling the first switch circuit by the control voltage;
• wherein when the first switch circuit is switched on, the first power input terminal is electronically connected to the second power input terminal, and when the first switch circuit is switched off, the first power input terminal is disconnected from the second power input terminal.