Patent ID: 8879285

Claim:
A power converter comprising: a booster circuit configured to boost DC power of a DC power source; an inverter circuit configured to convert the DC power outputted from the booster circuit into AC power and output the AC power to a system; a hysteresis control circuit configured to control the inverter circuit by hysteresis control so that the AC power is outputted to the system when an AC voltage of the system is less than a DC voltage of the power source; and a proportional-integral control circuit configured to control the booster circuit by proportional-integral control so that the AC power is outputted to the system when the AC voltage of the system is larger than the DC voltage of the power source; wherein: the inverter circuit includes a bridge circuit and a normal coil connected between the bridge circuit and the system; the hysteresis control and the proportional-integral control are performed based on a current flowing through the normal coil; and the power converter further comprises a control gain reduction circuit configured to reduce a control gain for a predetermined period from when the proportional-integral control circuit starts to control the booster circuit.