Patent ID: 6801444
Filing Date: 2004-10-05
Classification: H02M

Abstract:
A power circuit, comprising:a first power node supplying a first level of power; a second power node supplying a second level of power, which is lower than the first level; a first voltage-dividing capacitor, comprising an anode which is capable to be connected to the first power node and a cathode which is capable to be connected to the second power node; a second voltage-dividing capacitor, comprising an anode which is capable to be connected to the first power node and a cathode which is capable to be connected to the second-power node; an output terminal supplying an output voltage in first and second cycles, which are occurred alternately; and a control circuit functioning to connect, in the first cycle, the anode of the first voltage dividing capacitor to the first power node, the cathode of the first voltage dividing capacitor to the output terminal and to the anode of the second voltage-dividing capacitor, and the cathode of the second voltage-dividing capacitor to the second power node; and in the second cycle, the anode of the second voltage dividing capacitor to the first power node, the cathode of the second voltage dividing capacitor to the output terminal and to the anode of the first voltage-dividing capacitor, and the cathode of the first voltage-dividing capacitor to the second power node.