BENTO, A. A. M.; http://lattes.cnpq.br/1129596113585622; BENTO, Aluisio Alves de Melo.
Resumo:
In this dissertation, a simplified classification of active solutions for singlephase
power factor (PF) correction circuits with sinusoidal line current is given first.
Next, a review of general aspects of PF control strategies used with unidirectional
boost converter is carried out. Then, a systematic study of the charge control technique
is proposed for both discontinuous conduction mode (DCM) and continuous
conduction mode (CCM) by considering either peak or average current control. The
charge control has several advantages: it is independent of the pulsating or non-linear
characteristic of the converter, does not need to template the line current thus
eliminating multipliers, and allows making zero the current error in just one switching
period. Also, a new technique here named Frequency Modulation Charge Control
(FMCC) is introduced in order to improve the line current Total Harmonic Distortion
(THD) of an interleaved boost with capacitance midpoint connection (IBC) converter
already existent in the technical literature. Simulated and experimental results are
reported showing that the application of the FMCC technique results in a satisfactory
performance. In addition, two new integrated AC to AC converters are conceived
from the IBC converter, which present high power factor, low THD, and fast response.