Hybrid three-phase HPF rectifier with programmable input current THD, using FPGA device and VHDL language

In this paper is proposed and analyzed a digital hysteresis modulation using a FPGA (Field Programmable Gate Array) device and VHDL (Hardware Description Language), applied at a hybrid three-phase rectifier with almost unitary input power factor, composed by parallel SEPIC controlled single-phase rectifiers connected to each leg of a standard 6-pulses uncontrolled diode rectifier. The digital control allows a programmable THD (Total Harmonic Distortion) at the input currents, and it makes possible that the power rating of the switching-mode converters, connected in parallel, can be a small fraction of the total average output power, in order to obtain a compact converter, reduced input current THD and almost unitary input power factor. Finally, the proposed digital control, using a FPGA device and VHDL, offers an important flexibility for the associated control technique, in order to obtain a programmable PFC (Power Factor Correction) hybrid three-phase rectifier, in agreement with the international standards (IEC, and IEEE), which impose limits for the THD of the AC (Alternate Current) line input currents. The proposed strategy is verified by experiments. © 2008 IEEE.

Input for the preparation of a regional agenda for the programme of action of the International Conference on Population and Development: towards 2014 and beyond

Spanish version available at the Library

Climate Change and Development in Latin America and the Caribbean. Overview 2009

Includes bibliography

Towards an information society measurement instrument for Latin America and the Caribbean: getting started with census, household and business surveys

Includes bibliography

Nuevas tecnologías de participación en el trabajo con mujeres = New participatory technologies for working with women

Describe una serie de experiencias realizadas en Santiago de Chile, desde 1986 hasta 1989, en las que se emplea la técnica de la Expresión Corporal para lograr el crecimiento, el desarrollo y la participación de las mujeres de sectores marginales.

The new information technologies and women: essential reflections

Includes bibliography

Women and new technologies

Includes bibliography

Application of information and communication technologies for health systems in Belgium, Denmark, Spain, the United Kingdom and Sweden

Incluye Bibliografía

Information and communication technologies in the health sector: opportunities and challenges for the reduction of inequalities in Latin America and the Caribbean

Includes bibliography

New information and communications technologies for education in Latin America: risks and opportunities

Includes bibliography

Policies and practices for the use of information and communications technologies (ICTs) in education in Latin America and the Caribbean

Includes bibliography

Tri-state single-phase integrated inverters with input to output power decoupling control

Researches on control for power electronics have looked for original solutions in order to advance renewable resources feasibility, specially the photovoltaic (PV). In this context, for PV renewable energy source the usage of compact, high efficiency, low cost and reliable converters are very attractive. In this context, two improved simplified converters, namely Tri-state Boost and Tri-state Buck-Boost integrated single-phase inverters, are achieved with the presented Tri-state modulation and control schemes, which guarantees the input to output power decoupling control. This feature enhances the field of single-phase PV inverters once the energy storage is mainly inductive. The main features of the proposal are confirmed with some simulations and experimental results. © 2012 IEEE.

The input-output model

Includes bibliography

Some applications of the input-output model to the Argentine economy

Includes bibliography

Information and knowledge: the diffusion of information and communication technologies in the Argentine manufacturing sector

Includes bibliography