High step‐up DC/DC converters based on coupled inductor and switched capacitors

Ding, Jie; Zhao, Shiwei; Yin, Huarui; Qin, Pinquan; Zeng, Guanbao

doi:10.1049/iet-pel.2019.1264

Cited by 19 publications

(18 citation statements)

References 36 publications

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“…where d is the duty cycle of the main power switches S1 and S2. By utilizing (12)(13)(14)(15), the voltages across the VM capacitors are achieved as, ( )…”

Section: A Power Driver Topologymentioning

confidence: 99%

“…The voltage gain of the converter presented in Fig. 2(b) can be calculated by the method presented in (12)(13)(14)(15)(16)(17)(18). Therefore, the voltage gain of the converter is obtained as,…”

Section: A Power Driver Topologymentioning

confidence: 99%

“…The interleaved converter, as presented in [11], uses a high frequency (HF) transformer to provide high voltage gain. In [12] and [13], the combination of coupled inductors with voltage multiplier cells is utilized to increase the presented converters' voltage gain. The circuit, as illustrated in [14], is based on coupled inductors, and due to interleaved structure, the input current ripple of this converter is low.…”

Section: Introductionmentioning

confidence: 99%

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Interleaved Ultra-High Step-Up DC-DC Converters With Extendable Voltage Gains and ZVS Performance

et al. 2021

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This paper introduces eight novel interleaved non-isolated dc-dc converters with ultra-high step-up and zero voltage switching (ZVS) capabilities for renewable energy systems. To increase the voltage gain, the proposed converters benefit coupled inductors, high-frequency (HF) transformer, and voltage multiplier (VM) techniques. In comparison to other converters, which just benefit coupled inductors or HF transformers, these combinations of the techniques make an additional degree of freedom to achieve high voltage gains (more than 25 without extreme duty cycle). Besides, two active clamp circuits, including two stages of switch-capacitor VM cells, not only increase the voltage gain of the proposed converters but also act as an auxiliary circuit to provide ZVS. Moreover, the stored energy in the leakage inductances is absorbed and passed to the output by the clamp capacitors. The input current ripple is reduced by applying the interleaved technique. The voltage stress es across the power switches are clamped to lower values and can be controlled by the turn ratios of the coupled inductors and the HF transformer. The theoretical performance of the proposed converters is fully explained. Also, the proposed converters are compared with more than twenty latest interleaved high step-up and ultra-high step-up dc-dc converters. Finally, a 1 kW, 20 V/500 V laboratory prototype is built to prove the advantages of the proposed converters.INDEX TERMS Interleaved structure, dc-dc converter, ultra-high step-up converter, zero-voltage switching

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“…where d is the duty cycle of the main power switches S1 and S2. By utilizing (12)(13)(14)(15), the voltages across the VM capacitors are achieved as, ( )…”

Section: A Power Driver Topologymentioning

confidence: 99%

Section: A Power Driver Topologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interleaved Ultra-High Step-Up DC-DC Converters With Extendable Voltage Gains and ZVS Performance

et al. 2021

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“…Literature [14] improves the gain of the converter while retaining the performance of the original converter by introducing an additional coupling‐inductor voltage multiplier branch. Literature [15–17] proposed a high‐gain converter that combines switched capacitors and coupled inductors. The diode‐capacitor branch in the switched capacitor structure is used as a capacitor voltage doubler branch clamp absorption circuit.…”

Section: Introductionmentioning

confidence: 99%

High‐gain combined buck‐boost‐Cuk converter with coupled inductance

Desheng

Wang

Sun

et al. 2021

IET Power Electronics

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This article proposes a current step‐up converter for high‐gain applications by combining a buck‐boost converter and a Cuk converter to form a buck‐boost‐Cuk converter with a shared input terminal. In order to further improve the performance of the converter and reduce the number of components, the primary side and secondary side of the coupled inductor are respectively connected to different branches, so that the diode‐capacitor branch in this structure could be used as a voltage doubler branch, and performed as a passive clamp circuit to absorb leakage inductance energy, which suppressed the voltage spike generated by the parasitic capacitance and the leakage inductance of the resonance; to some extent, it reduced the voltage stress of the power switch. This paper analyzed the operating principle and performance of the converter, then made the parameter design for the proposed converter, and compared the performance of different converter systems. At last, this paper built a 150 W experimental prototype to verify the correctness of the theoretical analysis.

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“…Switched‐inductor circuits can also be implemented based on transformers and coupled inductors. The winding coefficient of transformers or coupled inductors significantly improves the converter BF 24 . Magnetically coupled inductors have been combined with a switched‐capacitor network 25,26 or an impedance source 27 to provide ultra step‐up gains.…”

Section: Introductionmentioning

confidence: 99%

A step‐up dc–dc topology with high gain, continuous input current, and low‐voltage stress on power switch

Eshtiaghi

Eshkevari

Mosallanejad

2021

Circuit Theory & Apps

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This paper proposes a new step‐up dc–dc converter, designed based on a new impedance network. The proposed single‐switch topology provides single‐stage conversion with a high boost factor using a high‐gain impedance source. The power switch is placed on the low‐voltage side of the converter. So it is exposed to low‐voltage stress. Thanks to this feature, the switch selection will be more convenient than before as it can be picked up from low‐voltage rating and low on‐resistance semiconductors. The topology is suitable for connecting to current‐sensitive energy resources due to the continuous input current. It operates with low duty cycles that yield decreasing the conduction losses of the power switch and improving the efficiency. Common ground is another advantage, which means the input and the output ground lines are the same. In this paper, the theory and operating principle of the proposed topology are presented in detail. Also, both simulation and experimental results will be represented to confirm the above claims. In this regard, a simple prototype has been built to evaluate the theoretical aspects. Results validate the topology and its operation.

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High step‐up DC/DC converters based on coupled inductor and switched capacitors

Cited by 19 publications

References 36 publications

Interleaved Ultra-High Step-Up DC-DC Converters With Extendable Voltage Gains and ZVS Performance

Interleaved Ultra-High Step-Up DC-DC Converters With Extendable Voltage Gains and ZVS Performance

High‐gain combined buck‐boost‐Cuk converter with coupled inductance

A step‐up dc–dc topology with high gain, continuous input current, and low‐voltage stress on power switch

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