US Patent 7786614 Semiconductor device of power compensation

According to an aspect of an embodiment, a semiconductor device includes: a reference line; a first line provided with a first voltage with respect to the reference line; a second line provided with a second voltage not less than the first voltage with respect to the reference line; a capacitor having a first capacitance arranged between the reference line and second line; a current limiting element arranged between the capacitor and the second line, for charging up the capacitor, the current limiting element limiting current flowing into the capacitor from the second line during charging up; a first switch connected between the first line and the capacitor; and a controller for controlling the first switch to discharge the capacitor.