Photovoltaic Flyback Microinverter With Tertiary Winding Current Sensing

Za’im, Radin; Jamaludin, Jafferi; Rahim, Nasrudin Abd

doi:10.1109/tpel.2018.2881283

Cited by 19 publications

(11 citation statements)

References 29 publications

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“…It must be made crystal clear that in this paper, the scope is limited to only studying the secondary leakage-rectifier problem under a high step-up condition in CCM. Focusing on this issue, however, does not require us to build a grid-connected closed-loop flyback inverter (although we have previously built a grid-connected PV flyback microinverter in [49]). To produce the high voltage stress phenomenon, it is sufficient to build a high step-up DC-DC converter with an input PV voltage of 18 V mpp and a DC output voltage of 380 V (21.1 voltage gain).…”

Section: Scope Of Studymentioning

confidence: 99%

High Step-Up Flyback with Low-Overshoot Voltage Stress on Secondary GaN Rectifier

et al. 2022

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This paper presents a new technique to mitigate the high voltage stress on the secondary gallium nitride (GaN) transistor in a high step-up flyback application. GaN devices provide a means of achieving high efficiency at hundreds (and thousands) of kHz of switching frequency. Presently however, commercially available GaN is limited to only a 650 V absolute voltage rating. Such a limitation is challenging in high step-up flyback applications due to the secondary leakage. The leakage imposes high voltage stress on the secondary GaN rectifier during its turn-off transient. Such stress may cause irreversible damage to the GaN device. A new method of leakage bypass is presented to mitigate the high voltage stress issue. The experimental results suggest that when compared to conventional secondary active clamp, a 2.3-fold reduction in overshoot voltage stress percentage is achievable with the technique. As a result, it is possible to utilize GaN as the rectifier while keeping the peak voltage stress within the 650 V limitation with the technique.

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Section: Scope Of Studymentioning

confidence: 99%

High Step-Up Flyback with Low-Overshoot Voltage Stress on Secondary GaN Rectifier

et al. 2022

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“…Different circuit configurations can be employed to connect PV panels to power converters, such as central or string arrangements [3]. However, it has been verified that module-level power conversion, i.e., each PV module with an individual power converter, provides the best solar energy harvesting capability and the best tracking of the global maximum power point [3,4]. Regarding the converter topologies currently employed in the field of modulelevel power conversion, the flyback converter [5,6] is gaining popularity since it provides important benefits such as galvanic isolation, high power density, easy voltage step-up, and low number of components [4].…”

Section: Introductionmentioning

confidence: 99%

A Modified Multi-Winding DC–DC Flyback Converter for Photovoltaic Applications

et al. 2021

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DC–DC power converters have generated much interest, as they can be used in a wide range of applications. In micro-inverter applications, flyback topologies are a relevant research topic due to their efficiency and simplicity. On the other hand, solar photovoltaic (PV) systems are one of the fastest growing and most promising renewable energy sources in the world. A power electronic converter (either DC/DC or DC/AC) is needed to interface the PV array with the load/grid. In this paper, a modified interleaved-type step-up DC–DC flyback converter is presented for a PV application. The topology is based on a multi-winding flyback converter with N parallel connected inputs and a single output. Each input is supplied by an independent PV module, and a maximum power point tracking algorithm is implemented in each module to maximize solar energy harvesting. A single flyback transformer is used, and it manages only 1/N of the converter rated power, reducing the size of the magnetic core compared to other similar topologies. The design of the magnetic core is also presented in this work. Moreover, the proposed converter includes active snubber networks to increase the efficiency, consisting of a capacitor connected in series with a power switch, to protect the main switches from damaging dv/dt when returning part of the commutation energy back to the source. In this work, the operating principle of the topology is fully described on a mathematical basis, and an efficiency analysis is also included. The converter is simulated and experimentally validated with a 1 kW prototype considering three PV panels. The experimental results are in agreement with the simulations, verifying the feasibility of the proposal.

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“…Distributed maximum power point tracking (DMPPT) architectures are proposed to decouple each PV unit in the system in order to mitigate mismatch losses. DMPPT techniques mainly include differential power processing (DPP) [7][8][9][10][11][12][13][14][15][16][17], submodule integrated converters [18][19][20], string MPPT [21][22][23][24], microinverters [25][26][27][28][29][30][31][32][33][34][35], module parallel converters [36], and module cascaded converters (MCCs) . MCC is commercially known as power optimiser and is widely reported in the literature [73][74][75][76][77][78][79][80][81][82][83][84].…”

Section: Introductionmentioning

confidence: 99%