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In conventional photovoltaic microinverters configuration, a single PV module is connected to the grid through two converter stages: a step-up dc-dc stage and a step-down dc-ac stage. In the first stage, a high frequency transformer is generally used to achieve the high step-up voltage ratio conversion to a voltage above the grid peak value, reducing the converter efficiency while increasing its size...
This paper presents a high-power-factor LED driver implemented by using an input current shaper. A DCM-operated flyback converter is placed between the main rectifier and DC bus, in order to increase the conduction angle of the rectifier diodes and to obtain low current harmonics injected to the mains. Power control stage is performed by a buck converter, which is integrated with the flyback, thus...
Single Stage Single Switch Power Factor converter is an integration of input power factor current shaper and a DC to DC output stage utilizing single control switch and having isolation between input and output providing wide band width response. The focus of the topology is to reduce the DC bus voltage at light load without compromising with input power factor. This paper presents detailed analysis...
This paper presents a new method for power decoupling control of single phase AC/DC converters using three switch poles to achieve unity power factor operation at AC side and power decoupling function at DC side. The method proposed compensate the pulsating power at twice the grid frequency by absorbing low frequency ripple current to a DC decoupling capacitor through the third switch pole operation...
A novel three-phase full-bridge power factor corrector is presented in this paper. The corrector operates in discontinuous conduction mode (DCM), the peak of input current follows the input voltage automatically. It can achieve zero-voltage-switching (ZVS) for the leading-leg switches and zero-current-switching (ZCS) for the lagging-leg switches without adding any auxiliary device. Due to the adoption...
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