A power converter configured to convert an AC power outputted from a generator into a DC power and supply it to a load, the power converter comprising: a switch unit connected between an output unit of the generator and the load; and a control unit configured to control a conductive state of the switch unit; the control unit including: a triangle wave generating circuit configured to generate a triangle wave voltage corresponding to each cycle of the AC voltage of the AC power outputted from the generator, based on the waveform of the AC voltage of an immediately preceding cycle, and having a constant peak voltage (Vp) a differential circuit configured to receive a voltage expressing an effective value or an average value of the voltage supplied via the switch unit to the load, and a predetermined target voltage, and generate a differential voltage between them; and a comparing circuit configured to compare the triangle wave voltage and the differential voltage generated by the differential circuit, generate a pulse signal that stipulates a conduction timing of the switch unit based on the comparison result, and control the conductive state of the switch unit; the power converter being characterized in that the control unit comprises a voltage generating circuit configured to generate a predetermined voltage; and a selection circuit configured to, based on the size relationship between a predetermined voltage generated by the voltage generating circuit and a differential voltage generated by the differential circuit, select one of the predetermined voltage and the differential voltage, and output it to the comparing circuit; and the comparing circuit is configured to compare the predetermined voltage or the differential voltage outputted from the selection circuit with the triangle wave voltage, and, based on the comparison result, generate a pulse signal that stipulates a conduction timing of the switch unit, and supply it to the switch unit. a switch unit connected between an output unit of the generator and the load; and a control unit configured to control a conductive state of the switch unit; the control unit including: a triangle wave generating circuit configured to generate a triangle wave voltage corresponding to each cycle of the AC voltage of the AC power outputted from the generator, based on the waveform of the AC voltage of an immediately preceding cycle, and having a constant peak voltage (Vp) a differential circuit configured to receive a voltage expressing an effective value or an average value of the voltage supplied via the switch unit to the load, and a predetermined target voltage, and generate a differential voltage between them; and a comparing circuit configured to compare the triangle wave voltage and the differential voltage generated by the differential circuit, generate a pulse signal that stipulates a conduction timing of the switch unit based on the comparison result, and control the conductive state of the switch unit; a triangle wave generating circuit configured to generate a triangle wave voltage corresponding to each cycle of the AC voltage of the AC power outputted from the generator, based on the waveform of the AC voltage of an immediately preceding cycle, and having a constant peak voltage (Vp) a differential circuit configured to receive a voltage expressing an effective value or an average value of the voltage supplied via the switch unit to the load, and a predetermined target voltage, and generate a differential voltage between them; and a comparing circuit configured to compare the triangle wave voltage and the differential voltage generated by the differential circuit, generate a pulse signal that stipulates a conduction timing of the switch unit based on the comparison result, and control the conductive state of the switch unit; the power converter being characterized in that the control unit comprises a voltage generating circuit configured to generate a predetermined voltage; and a selection circuit configured to, based on the size relationship between a predetermined voltage generated by the voltage generating circuit and a differential voltage generated by the differential circuit, select one of the predetermined voltage and the differential voltage, and output it to the comparing circuit; and the comparing circuit is configured to compare the predetermined voltage or the differential voltage outputted from the selection circuit with the triangle wave voltage, and, based on the comparison result, generate a pulse signal that stipulates a conduction timing of the switch unit, and supply it to the switch unit.