Patent ID: 7446521
Filing Date: 2008-11-04
Classification: H02M

Abstract:
1. A DC DC voltage boost converter comprising a first and a second input terminals to receive a direct input voltage, an inductive stage connected between said input terminals and comprising an inductor connected to a node in series with a switch, and at least one first and one second voltage boost structure, comprising: a level translator circuit connected between said node of the inductive stage and the input terminal connected to the electric earth and comprising a capacitor connected in series at a node to a directly connected diode; at least a first boost structure to supply a positive output voltage between a positive output terminal and an output terminal connected to the electric earth, said first structure being connected between an input node formed by said node of the inductive stage and said positive output terminal; and comprising a first switch connected to said input node, and k at least one second boost structure to supply a negative output voltage between a negative output terminal and said output terminal connected to the electric earth, said second structure being connected between an input node formed by said node of the level translator stage and said negative output terminal, and comprising a first switch connected to said input node, and k k each pair of switches of said first and second structures comprising a first switch and a second switch in series, controlled simultaneously and alternately one to the open state and the other to the closed state, the first switches being such that, in the closed state, the first switches place a group of input capacitor(s) in series and a group of corresponding output capacitor(s), and the second switches being such that, in the closed state, the groups of input and output capacitors are connected in parallel between the input node of the corresponding structure and the corresponding positive or negative voltage terminal; and the switch of the inductive stage, said first switch of the second structure, said first switches of the pairs of the first structure and said second switches of the pairs of the second structure being simultaneously controlled alternately to the open and closed state, and said first switch of the first structure, said second switches of the pairs of the first structure and said first switches of the pairs of the second structure being simultaneously controlled to the opposite state.