| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-output switching power supply device in which inputs of a plurality of switching power supplies are connected in series and an input voltage is regulated in such a manner that the input voltage does not exceed an input voltage specification of each of the switching power supplies.SOLUTION: A multi-output switching power supply device comprises: a first DC-DC converter which outputs a first DC voltage and a second DC-DC converter which outputs a second DC voltage, inputs of the first and second DC/DC converters being connected to a DC power supply in series and outputs thereof being connected to a load in series; and a third DC-DC converter of which the input is connected to the input of the second DC-DC converter in parallel and which outputs a third DC voltage. The multi-output switching power supply device also comprises a control circuit by which input voltages of the DC-DC converters are detected to generate an average value, the first and second DC-DC converters are controlled in accordance with a difference between the input voltages and the average value and output voltages and the third DC-DC converter is controlled in accordance with the third DC voltage.SELECTED DRAWING: Figure 1 |
