Abstract
There has been increasing interest for industry applications, such as solar power generation, fuel cell systems, and dc microgrids, in step-up dc-dc converters with reduced number of components, low component stress, small input ripples and high step-up ratios. In this paper, an input-parallel-output-series three-level boost (IPOS-SC-TLB) converter is proposed. In addition to achieving the required performance, the input and output terminals can share the same ground and an automatic current balance function is also achieved in the IPOS-SC-TLB converter. Besides, a capacitor voltage imbalance mechanism was revealed and a three-loop control strategy composed of output voltage loop, input current loop and voltage-balance loop was proposed to address the voltage imbalance issue. Finally both simulation and experiment studies have been conducted to verify the effectiveness of the IPOS-SC-TLB converter and the three-loop control strategy.
Highlights
Multilevel step-up dc-dc converters are widely employed in wind farms [1,2,3,4,5,6], solar power generation systems [7,8,9,10,11], fuel cell systems [12,13,14,15], high-power charging stations for electric cars [16,17], and dc microgrids [18,19,20]
To address the abovementioned issues and to achieve a reduced number of components, low component stress, small input ripples and high step-up ratio, an input-parallel-output-series switched-capacitor three-level boost (IPOS-SC-TLB) converter is proposed in this paper
As analyzed above, flying-capacitor technique introduced into multilevel boost converters based on SI structure could help solve the problem that input and output terminals do not share the same ground while flying-capacitor technique introduced into multilevel boost converters based on PI structure could help enhance voltage gains
Summary
Multilevel step-up dc-dc converters are widely employed in wind farms [1,2,3,4,5,6], solar power generation systems [7,8,9,10,11], fuel cell systems [12,13,14,15], high-power charging stations for electric cars [16,17], and dc microgrids [18,19,20]. Small off times will cause severe diode reverse-recovery currents, increasing electromagnetic interference (EMI) levels [9] Another flying-capacitor-based three-level boost converter with intrinsic voltage doubler was proposed in [21,22]. To address the abovementioned issues and to achieve a reduced number of components, low component stress, small input ripples and high step-up ratio, an input-parallel-output-series switched-capacitor three-level boost (IPOS-SC-TLB) converter is proposed in this paper. Compared with the existing three-level boost converters, the proposed converter has the advantages of high voltage gain at full duty cycle range, small component stress, a reduced number of components, common ground for the input and output terminals, and automatic current balancing.
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