Patent ID: 10110132

Abstract:
A switching power supply device generates a DC output voltage based on a DC input voltage, and includes n converter units and a control unit. The control unit executes first driving control that drives k1 (where 0≤k1<n) out of the n converter units when the DC output voltage has risen to an upper limit value of the reference voltage range and second driving control that drives k2 (where k1<k2≤n) out of the n converter units when the DC output voltage has fallen to a lower limit value of the reference voltage range. During the first driving control, if the DC output voltage Vo reaches a first value above the upper limit value, k1 and k2 are decreased by a value k0. During the second driving control, if the DC output voltage Vo reaches a second value below the lower limit value, k1 and k2 are increased by the value k0.