Soft Switching High Voltage Gain Quasi-Z-Source DC–DC Converter With Switched-Capacitor Technique

Ding, Xinping; Wang, Fenglian; Zhou, Mingzhu; Cao, Yichang; Wei, Zhengyi

doi:10.1109/tie.2021.3125649

Cited by 17 publications

(4 citation statements)

References 45 publications

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“…5, where rS is the switch on-resistance, rD is the diode forward resistance, VFD is the diode threshold voltage, rL1 is the ESR of the input inductor, rN is the ESR of the winding, and rC is the ESR of the capacitor. The power dissipation of components is calculated with the method in [37]. Hence, the overall power loss of the proposed isolated converter can be described as (2 )…”

Section: Efficiency Analysismentioning

confidence: 99%

Isolated High Step-Up Soft-Switching Quasi-Z-Source DC–DC Converter

Tian,

Chen,

Ding

et al. 2024

IEEE Access

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The DC microgrid with energy storage cells has strong stability, simple control, and a convenient power supply for DC loads, increasingly becoming the grid-connected structure of distributed generation systems. This paper presents an isolated high voltage gain soft-switching dc-dc converter suitable for DC microgrid applications. The converter comprises a dual-switch quasi-z-source network, multiplier voltage cell, and transformer. It has advantages such as high voltage gain, zero voltage switching (ZVS) of switches, zero voltage zero current switching (ZVZCS) turn-on and turn-off of diodes, and low input ripple current. The converter can achieve high voltage gain with an appropriate duty cycle and transformer turns ratio, reducing leakage inductance of transformer, which decreases the power loss and voltage spike of switch. Soft-switching of active devices increases the efficiency and decreases the output voltage ripples of the converter. The steady-state characteristics of the converter, voltage and current stress of components, the efficiency of the converter, and the selection of converter parameters are analyzed in detail. Finally, a 200 W experimental prototype is built in the laboratory for experimental verification, and the experimental results are consistent with the theoretical analysis.INDEX TERMS Isolated dc-dc converter, high-efficiency, high step-up, quasi-Z-Source.

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Section: Efficiency Analysismentioning

confidence: 99%

Isolated High Step-Up Soft-Switching Quasi-Z-Source DC–DC Converter

Tian,

Chen,

Ding

et al. 2024

IEEE Access

Self Cite

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show abstract

“…To overcome the defects of traditional voltage source inverters, the Z-source inverter (ZSI) is put forward by Professor Peng Fangzheng [2]. In contrast to the traditional inverter, the ZSI can eliminate the dead time of the switching tube and realize the single-stage lift voltage transformation, effectively compensating for the shortcomings of the traditional voltage-source inverter [4][5][6]. Reference [7] proposed a quasi-Z-source H-bridge grid-connected inverter (QHGCI), which had the advantages of the void of shootthrough problem and the high DC-voltage utilization.…”

Section: Introductionmentioning

confidence: 99%

A transformerless Z‐source photovoltaic grid‐connected inverter with coupled inductor coil

Dai,

Zhang

2024

Micro & Nano Letters

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The quasi‐Z‐source H‐bridge grid‐connected inverter (QHGCI) is well known for its advantages of the void of the shoot‐through problem and the high DC‐voltage utilization. But the existence of the common‐mode leakage current in the power frequency cycle, lower power density, and higher thermal stress make it hard applicable to the grid‐penetrating application. Thus with the purpose to conquer the problem relating to the QHGCI, an innovative transformerless Z‐source photovoltaic grid‐connected inverter with a coupled inductor coil (TZPGCI‐CIC) is proposed. The circuitry topology and an unipolar sine pulse width modulation strategy are first introduced in short. Thereafter, the common‐mode voltage in the whole working process is derived and evaluated through the detailed operating mode analysis, in which a constant value of it has been theoretically revealed. Lastly, a prototype platform of TZPGCI‐CIC is set up and its good performance on leakage current suppression, and lower thermal stress are validated with the experimental results.

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“…Since the mentioned systems are responsible for power supply, voltage levels of at least up to 310 volts (for single-phase power) are required to supply the inverter voltage level [10]. But the DC output is low and requires high-voltage gains in the converter [11]. Conventional boost converter is not suitable, because they are not able to provide high-voltage gains with low duty cycle and low losses.…”

Section: Introductionmentioning

confidence: 99%

A new three winding coupled inductors high step‐up DC–DC converter with low input current ripple

Vesali

2023

IET Power Electronics

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A new high step‐up DC–DC converter is proposed in this study. In the proposed converter with voltage lift technique and coupled inductors (CIs) a high voltage gain is achieved. Although the proposed converter has coupled inductors, the input current is continuous and the input current ripple is low. The proposed converter has only one switch and does not have any auxiliary switch, in which the control of the switch is easy. Soft switching condition is presented for the switch in the converter as zero current switching (ZCS) for turning on instant and zero voltage switching (ZVS) for turning off instant, in which the efficiency is increased. For all diodes expect two diodes in the converter ZCS condition is provided when diodes turn off that reverse recovery problem is solved for these diodes. The proposed converter is fully analyzed and described operation of it. To confirm theoretical analysis, 300 W of the proposed converter is implemented and tested, for which in full load an efficiency of 96.5% is achieved.

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Soft Switching High Voltage Gain Quasi-Z-Source DC–DC Converter With Switched-Capacitor Technique

Cited by 17 publications

References 45 publications

Isolated High Step-Up Soft-Switching Quasi-Z-Source DC–DC Converter

Isolated High Step-Up Soft-Switching Quasi-Z-Source DC–DC Converter

A transformerless Z‐source photovoltaic grid‐connected inverter with coupled inductor coil

A new three winding coupled inductors high step‐up DC–DC converter with low input current ripple

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