Patent ID: 6456513
Filing Date: 2002-09-24
Classification: G05F

Abstract:
A voltage conversion circuit comprising:a plurality of voltage conversion cells, each of the voltage conversion cells including a capacitor element; a switch circuit, connected to the plurality of voltage conversion cells, for selectively switching between parallel connection of a plurality of voltage conversion cells and serial connection of a plurality of voltage conversion cells; and a control circuit, connected to the switch circuit and the plurality of voltage conversion cells, for controlling the switch circuit to selectively perform first voltage conversion of an input voltage and second voltage conversion, wherein in the first voltage conversion, the control circuit provides first control signals having the same phase to the plurality of parallel-connected voltage conversion cells to perform a step-up operation or a step-down operation in parallel, and wherein in the second voltage conversion, the control circuit provides second control signals having opposite phases to the plurality of series-connected voltage conversion cells to perform the step-up operation or the step-down operation in order.