Patent ID: 7102330

Claim:
A charging and discharging control apparatus that controls charging and discharging of an energy storage device by a load that is connected to the energy storage device, comprising: an upper limit power setting device that, when a charging voltage that is applied to the energy storage device exceeds a restriction determining voltage that is set in order to start a restriction of charging power to the energy storage device, sets a charging power value at that point as an upper limit power value for the charging power; a power restricting device that multiplies a restriction coefficient by the upper limit power value while gradually reducing the restriction coefficient using a predetermined reduction width until the charging voltage drops below the restriction determining voltage, and, by setting a result thereof in the load as a control target value of the charging power, restricts the charging power; and a restriction removal device that, when the charging voltage drops below a restriction removal determining voltage that is set in order to remove a restriction on the charging power, multiplies the restriction coefficient by the upper limit power value while gradually increasing the restriction coefficient using a predetermined increase width, and, by setting a result thereof in the load as a control target value of the charging power, removes the restriction on the charging power, wherein the reduction width of the restriction coefficient in the power restricting device is set to be larger than the increase width of the restriction coefficient in the restriction removal device.