PROBLEM TO BE SOLVED: To provide a power source shunt system which reduces flexibility of power control capacity and dimensional mass of a power system for supplying power generated by a solar battery to a load.;SOLUTION: The power source shunt device is constituted by combining: a switching circuit 110 which has hysteresis with narrow voltage width and constantly performs continuous switching operations; and an on/off circuit 120 which has hysteresis with wide voltage width and singly performs ON/OFF operations. An error voltage detection circuit 150 detects the error voltage of a bus line 500 and transmits a control signal to the switching circuit and the on/off circuit. The switching circuit performs constant shunt current control and when load fluctuation exceeding shunt current capacity controllable by the switching circuit occurs, the on/off circuit operates. When the on/off circuit operates, shunt current control of a large current is performed, and the process returns to a control range controllable by the switching circuit again and the switching circuit controls the shunt current.;COPYRIGHT: (C)2005,JPO&NCIPI
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