| 摘要 |
PROBLEM TO BE SOLVED: To match electric power supplied to a power source to a load through a plurality of electric wires being provided with a semiconductor switching element respectively.SOLUTION: When an electric power of a power source B is supplied to a load 3 with electric wires 51, 52 provided to IPD131, 132 respectively connected to the power source B in parallel, a supply power to the load 3 of the respective electric wires 51, 52 is calculated by a power data calculation part 116a, 116b based on a passing current of the electric wires 51, 52 which is measured with a current measuring part b of the IPD131, 132, a voltage value VB inputted in a power source voltage input terminal BATT, and a measured current. By DUTY ratio correction value calculation parts 117a, 117b and PWM_DUTY ratio control parts 113a, 113b, a duty ratio is calculated for a supply power to the load 3 of the electric wires 51, 52 to be matched with a design value, and using the calculated duty ratio, driving of a semiconductor switching element a of corresponding IPD131, 132 is PWM-controlled.SELECTED DRAWING: Figure 2 |
