Power supply system and power converter with start circuit for boost modules

A power supply system, comprising:

• a plurality of power converters, wherein output terminals of the plurality of power converters are electrically coupled to each other, and any one of the plurality of converters comprises:
• a rectifier unit, configured to generate a first voltage;
• a first boost module, electrically coupled to the rectifier unit and configured to generate a second voltage according to the first voltage;
• a start circuit, electrically coupled to the first boost module, and configured to provide a third voltage according to the second voltage;
• a second boost module, electrically coupled to the start circuit, and configured to generate a fourth voltage according to the third voltage;
• a first switch, electrically coupled to the first boost module and the second boost module, and configured to selectively conduct the fourth voltage provided by the second boost module to the first boost module;
• and
• a control unit, electrically coupled to the rectifier unit, the first boost module and the first switch;
• wherein after the second boost module receives the third voltage, the fourth voltage is delivered via the first switch from the second boost module to the first boost module, on the condition that the control unit receives the first voltage for a predetermined time, the control unit is configured to turn off the first switch and stop outputting the fourth voltage to the first boost module.