Uninterruptible power system

An uninterruptible power system, comprising:

• a first converter having a first input terminal for receiving a first power source and a first output terminal for outputting a first voltage, wherein the first power source is a DC power or AC power and the first voltage is a DC voltage;
• a third converter having a third input terminal for receiving a second power source and a third output terminal electrically connected to the first output terminal, wherein the second power source is a DC power;
• and
• at least one second converter, each of the at least one second converter comprising:
• an isolation unit having a first isolation side electrically coupled to the first output terminal for receiving the first voltage and a second isolation side;
• and
• a synchronous rectifier module electrically connected to the second isolation side for performing synchronous rectification on an output voltage of the isolation unit.

A uninterruptible power system, comprising:

• a first converter having a first input terminal for receiving a first power source and a first output terminal for outputting a first voltage, wherein the first power source is a DC power or AC power and the first voltage is a DC voltage;
• a third converter having a third input terminal for receiving a second power source and a third output terminal electrically connected to the first output terminal, wherein the second power source is a DC power;
• and
• a second converter having a second input terminal electrically connected to the first output terminal and the third output terminal, and a second output terminal for outputting a second voltage corresponding to the first voltage,
• wherein the output voltage of the third output terminal varies in accordance with a variation of the DC power received by the third input terminal.

An uninterruptible power system, comprising:

• a first power source module, comprising:
• a first converter having a first input terminal for receiving a first power source and a first output terminal for outputting a first voltage, wherein the first power source is a DC power or AC power and the first voltage is a DC voltage;
• and
• a third converter electrically coupled to the first converter for receiving a second power source, wherein the second power source is a DC power;
• and
• a second converter having a second input terminal electrically connected to the first output terminal of the first converter for receiving the first voltage and a second output terminal for outputting a second voltage corresponding to the first voltage.