Patent ID: 7511977

Claim:
A switching power supply apparatus for generating a first output voltage having a reversed polarity of an input voltage and a second output voltage of double the input voltage with a reversed polarity and then outputting them from a first output terminal and a second output terminal, the apparatus comprising: a flying capacitor; a first output capacitor connected with the first output terminal; a second output capacitor connected with the second output terminal; and a driver circuit which controls charge states of said flying capacitor, said first output capacitor and said second output capacitor, wherein said driver circuit repeats a first charging period, a second charging period and a third charging period in a time-division manner, where the first charging period is a period during which said flying capacitor is charged with the input voltage, the second charging period is a period in which a high-potential-side terminal of said flying capacitor is connected with a fixed potential terminal and said first output capacitor is charged with a voltage appearing at the other end thereof, and the third charging period is a period in which a high-potential-side terminal of said flying capacitor is connected with the first output terminal and said second output capacitor is charged with a voltage appearing at the other end thereof, and wherein the voltages appearing at said first output capacitor and said second output capacitor are outputted from the first output terminal and the second output terminal as the first output voltage and the second output voltage.