Patent ID: 6989999

Claim:
A charge pump type DC/DC converter comprising: a voltage input terminal connected to the output terminal of a DC cower supply; first and second capacitors; a voltage output terminal connected to a load; a switch circuit network having a first phase, in which a first terminal of the first capacitor is connected to the voltage input terminal, a first terminal of the second capacitor is connected to the voltage output terminal, and a second terminal of the first capacitor and a second terminal of the second capacitor are connected to each other, and a second phase, in which the first and second terminals of the first capacitor are connected to the voltage output terminal and the voltage input terminal, respectively, and the first and second terminals of the second capacitor are connected to the voltage input terminal and a reference potential, respectively; a switching controller that controls the switch circuit network to switch the first and second phases alternately at prescribed duty ratios; wherein the first capacitor is comprised of n (n is an integer of 2 or larger) capacitor elements, the n capacitor elements are connected in series in the firstphase, and the n capacitor elements are connected in parallel with each other in the second phase, and wherein output voltage (V olt is defined by V olt =[1+1/(N+1)] Vinput.