AC-DC converter with output power suppression

A power conversion apparatus comprising:

• an AC-DC conversion circuit connected with an AC power source at an input end thereof for converting an AC power supplied from the AC power source to DC power;
• a DC-DC conversion circuit connected with an output end of the AC-DC conversion circuit at an input end thereof for converting DC voltage level of the DC power generated by the AC-DC conversion circuit;
• a smoothing capacitor parallel connected to the output end of the AC-DC conversion circuit and the input end of the DC-DC conversion circuit;
• a DC link voltage detector for detecting a voltage of the smoothing capacitor as a DC link voltage;
• and
• a control unit for controlling operation of the DC-DC conversion circuit,
• wherein the control unit is configured to suppress output power of the DC-DC conversion circuit if the DC link voltage is smaller than a first predetermined value, and
• the control unit suppress the output power of the DC-DC conversion circuit by multiplying a voltage command value as a value to command an output voltage of the DC-DC conversion circuit by a coefficient set in a range between 0 and 1 in accordance with the DC link voltage.