Patent ID: 7239534
Filing Date: 2007-07-03
Classification: H02M

Abstract:
1. A cellular inverter for generating an alternating electrical voltage from a succession of various serial combinations of DC voltage electrical sources, comprising: a series of several elementary cells and a switching control unit, said elementary cells having a bridge structure with a controlled switch in each of the branches of the bridge and a DC voltage electrical source in a first diagonal of the bridge, and being interconnected within the series via the second diagonal of their bridge structure, said switching control unit delivering the control commands for the controlled switches of the various elementary cells comprising: a high-frequency switch-mode voltage regulation circuit operating so as to minimize an error signal that is representative of the difference existing between the electrical voltage present across the ends of the series of cells and a variable voltage setpoint sampling a model form of alternating voltage, and generating signals indicating arrival at upper and lower limits of its range of operation, and a circuit for selecting the serial combination of the DC voltage electrical sources of the elementary cells in service controlled by means of the signals indicating arrival at upper and lower limits of range of operation delivered by the high-frequency switch-mode voltage regulation circuit wherein said switching control unit comprises a high-frequency switch-mode voltage regulation circuit equipped with a pre-compensation device that is controlled by the signals indicating arrival at upper and lower limits of range of operation and that corrects its lag during a voltage jump caused by a change of the serial combination of DC voltage electrical sources currently in use.