| 摘要 |
PROBLEM TO BE SOLVED: To reduce a ripple current in an input capacitor by controlling the phase difference of each channel in a digital control step-down DC/DC converter of two or more channels using nonlinear control.SOLUTION: In an operational state, each channel is operated by digital control using the nonlinear control, and each interval of the ON timing of a switching element 2-1 and a switching element 2-x (x:2 to N) is measured by the timer function of an arithmetic processing unit 7. If each interval is within a range which is determined beforehand, the operation is continued with the setting of an ON time of the switching element 2-x used in the previous time. If the interval is out of the range, the ON time is increased or decreased within the range of the ON time of the corresponding switching element, to make deviation from a basic frequency fch1, so that the interval of the ON timing of the switching element 2-1 and the switching element 2-x is restored to be within the range. |
