A microprocessor-based controlled boost convertor to obtain good input and output performance parameters

A microprocessor-based controlled boost power convertor makes it possible to exploit a single-phase AC-DC power convertor with good input and output performance parameters. With regard to the input performance, this paper outlines two simple algorithms for a digital signal processor (DSP) based control circuit of the boost switch. The first algorithm fulfils the requirements of the suppliers of electricity, namely an input current which is under all circumstances nearly sinusoidal, with a very low harmonic distortion. The second algorithm makes it possible to satisfy the demands of certain consumers of electricity, namely a high power factor, so that the available maximum power of the grid is used. Both algorithms are implemented on the TMS320C25 processor and operate at a fixed frequency. Since, a high quality output voltage is usually of first importance in switched-mode power conversion, this output performance parameter is controlled by a PI-based output voltage regulator which is also implemented on the processor