Power converter and method of controlling the same

A power converter, comprising a PFC rectifier module, a DC-DC converter module, a positive DC bus and a negative DC bus, wherein

• the PFC rectifier module is connected to an AC input of the power converter, and the positive DC bus and the negative DC bus of the power converter;
• the DC-DC converter module is connected to the positive DC bus, the negative DC bus and an output of the power converter,
• when the output voltage of the power converter is greater than or equal to a minimum limit value of the bus voltage output by the PFC rectifier module, the DC-DC converter module operates in a constant-on mode in which the DC-DC converter module does not perform voltage conversion, and the PFC rectifier module outputs the bus voltage which is adjusted according to the output voltage of the power converter;
• and
• when the output voltage of the power converter is less than the minimum limit value of the bus voltage output by the PFC rectifier module, the DC-DC converter module operates in a voltage-regulation mode in which the DC-DC converter module converts the bus voltage output by the PFC rectifier module into the output voltage of the power converter, and the PFC rectifier module outputs the bus voltage with a constant value.