Abstract
A step up/down AC/DC converter with modified dual loop control is proposed. The step up/down AC/DC converter features the bridgeless characteristic which can reduce bridge-diode conduction losses. Based on the step up/down AC/DC converter, a modified dual loop control scheme is proposed to achieve input current shaping and output voltage regulation. Fewer components are needed compared with the traditional bridge and bridgeless step up/down AC/DC converters. In addition, the intermediate capacitor voltage stress can be reduced. Furthermore, the top and bottom switches still have zero-voltage turn-on function during the negative and positive half-line cycle, respectively. Hence, the thermal stresses can also be reduced and balanced. Simulation and experimental results are provided to verify the validity of the proposed step up/down AC/DC converter and its control scheme.
Highlights
Power factor correction is very popular and necessary for modern power sources in the ac grid.It decreases line current harmonics, line losses, and increases system power capacity due to reducing system reactive power flow [1,2,3]
Boost rectifiers are the most commonly-used circuit structures implemented for power factor correction
To verify the validity of the bridgeless step up/down AC/DC converter, some simulation results are executed and a prototype system is constructed to facilitate the theoretical results as verification
Summary
Power factor correction is very popular and necessary for modern power sources in the ac grid. Cuk [18] power-factor-correction rectifiers were proposed with reduced number of components and losses. Power-factor-correction rectifiers were proposed with reduced number of components four conduction diodes are still needed to achieve step up/down output voltage. Cuk/Sepic power factor correction rectifier conduction losses These rectifiers were operated in discontinuous conduction mode without current. Cuk/Sepic power correction rectifier method requires an extra voltage sensor for the intermediate capacitor and the system cost is the bulky electrolytic be replaced with power a smalldecoupling film capacitor, control in continuous conduction mode capacitor was can proposed to achieve [19].this. A modified dual loop control is alsoscheme proposed achieve inputtocurrent shaping current shaping andregulation output voltage regulation well as voltage stress reduction.
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