Abstract
In this paper a single-phase boost PFC multilevel interleaved high-voltage gain based on the hybrid switched-capacitor concept is presented. The proposed converter merges interphase transformers and switched-capacitor cells to obtain current sharing and high voltage gain. These features allow for both the reduction of voltage and current stresses on the semiconductors. Furthermore, the interleaving method allows for obtaining multilevel voltages at AC terminals, thereby reducing the weight and bulk of the input inductor. PFC operation is guaranteed through both input current control and output voltage control. Both steady-state and dynamic analyses were conducted. Experimental results for a 1.25 kW, 127 V to 800 V laboratory prototype are presented and discussed.
Highlights
In recent years there has been a growing demand for high voltage power supplies
This paper presents a single-phase hybrid switched-capacitor (HSC) interleaved AC-DC boost converter with a high power factor and high static gain
The inductors of interphase transformers have a bulk reduction, as they only have high-frequency magnetic flux. These advantages make the proposed topology more interesting when compared with the topologies presented by [21] because it operates in the PFC, as the reference topologies, and makes it possible to obtain other topologies with lower current stresses on semiconductors for high power applications compared to the reference
Summary
In recent years there has been a growing demand for high voltage power supplies. These sources are required in applications such as renewable energy systems [1] and electric vehicle powertrains [2], among others [3], [4]. A PFC boost rectifier is applied to obtain a sinusoidal current at the input and a high power factor It has a voltage-elevating characteristic, the gain of this converter is limited owing to losses and high efforts in semiconductors. The interleaving technology is applied in power applications above 600 W, which increases the equivalent switching frequency as demonstrated by [22]–[24] It presents the current share between the connection arms, promotes waveform frequency multiplication of inductive and capacitive elements, and reduces voltage efforts [25], [26]. In [36] an input-parallel-outputseries multilevel boost converter integrated with SC cells These topologies present high-voltage gain and small voltage across all components, owing to the advantages of the interleaving method associated with SC concept. To validate the proposed converter, experimental results were obtained from a 1.25 kW prototype with 800 V output voltage
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