Hybrid Discontinuous/Boundary Conduction Mode of Flyback Microinverter for AC–PV Modules

Christidis, Georgios C.; Nanakos, Anastasios Ch.; Tatakis, Emmanuel C.

doi:10.1109/tpel.2015.2470094

Cited by 64 publications

(34 citation statements)

References 34 publications

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“…According to Equations 15,16, and 17, the relationship between the output power P o and primary reference current i ref is…”

Section: Proposed Zcs Flyback Invertermentioning

confidence: 99%

“…Where I p = i ref , and according to previous studies, 28,29 if the leakage inductance of the transformer is finite, the effective turns ratio between the primary and secondary will change. Thus, the relationship between the primary current I p and the secondary current I s of the transformer is achieved by Equation 16.…”

Section: Proposed Zcs Flyback Invertermentioning

confidence: 99%

“…However, operation in CCM is not a feasible solution because the transfer function of the output current in a flyback CCM inverter has a right-half-plane (RHP) zero, which leads to difficulty in controlling the output current, [12][13][14] while DCM and BCM can be realized with peak-current control. 16,17 The DCM operation has an advantage of simplicity in control, which is preferred for light power. 16,17 The DCM operation has an advantage of simplicity in control, which is preferred for light power.…”

mentioning

confidence: 99%

“…15 Also, a hybrid switching strategy has been adopted to improve the efficiency and power density of the inverter. 16,17 The DCM operation has an advantage of simplicity in control, which is preferred for light power. 15,18,19 However, when the flyback inverter is operating in DCM, results in high primary peak current increases the switching losses.…”

mentioning

confidence: 99%

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Analysis and implementation of a new zero current switching flyback inverter

Ansari

Moghani

Mohammadi

2018

Circuit Theory & Apps

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In this paper, a novel zero current switching (ZCS) flyback inverter in discontinuous conduction mode (DCM) is proposed. In the proposed flyback inverter, the ZCS for the primary switch is achieved by adding a simple auxiliary circuit to the conventional flyback inverter. Also, the auxiliary switch is turned on and turned off at ZCS condition. Therefore, the switching losses of the switches are negligible, which increases the efficiency and allows higher switching frequency and more compact design. The resonant auxiliary cell is activated only in short transition times that makes its conduction losses negligible. Furthermore, the voltage overshoot of the main switch is limited during the turn-off process, which allows utilization of lower voltage metal-oxide semiconductor field-effect transistors (MOSFETs) with low conduction losses and low cost. The detailed operation of the flyback inverter with auxiliary circuit and design considerations are presented. Simulation and experimental results are presented to verify the performance of the proposed inverter.

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“…According to Equations 15,16, and 17, the relationship between the output power P o and primary reference current i ref is…”

Section: Proposed Zcs Flyback Invertermentioning

confidence: 99%

Section: Proposed Zcs Flyback Invertermentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Analysis and implementation of a new zero current switching flyback inverter

Ansari

Moghani

Mohammadi

2018

Circuit Theory & Apps

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“…In order to improve the efficiency as well as the converter performance and power density of the flyback microinverter on a wider power range, a dual-mode switching strategy has been adopted in Kyritsis et al and Christidis et al 4,11 This topology combines the discontinuous conduction mode (DCM) and boundary conduction mode (BCM) operations, simultaneously during a half-line period. Another trend focuses on the hybrid DCM and continuous conduction mode (CCM) operations, which has the merits of higher efficiency with lower current stress, higher power capability, easier filter design, higher tracking performance, and a better disturbance rejection.…”

mentioning

confidence: 99%

A new adaptive clamp for improving weighted efficiency in grid‐tied photovoltaic interleaved two‐switch flyback micro‐inverter

Mohammadi

Izadfar

Eskandarian

2019

Int Trans Electr Energ Syst

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Summary This paper proposes a new adaptive clamp based on the hybrid operation of the interleaved two‐switch flyback micro‐inverter in one‐phase and two‐phase discontinuous conduction modes (DCM) depending on the output power of the PV panel. The proposed adaptive clamp controls the second switch of the two‐switch flyback structure based on the drain‐to‐source voltage spike of the flyback's main switch during the turn‐off process. Thus, in low‐voltage regions, a conventional flyback (single‐switch) operation is achieved with reduced switching, gate driving, and clamp diodes losses. Also, in the low output powers of the micro‐inverter, only one phase of the micro‐inverter operates to decrease the power loss associated with one phase. The theoretical analysis, simulation, and experimental results show the effectiveness of the proposed adaptive clamp and the phase control methods in improving the efficiency in all power ranges.

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Reduction of harmonic current distortion for single‐phase grid‐tied inverter operated in discontinuous current mode

Zhang

Isobe

Tadano

2020

IEEJ Transactions Elec Engng

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Discontinuous current mode (DCM) with high-frequency operation can be an effective way to reduce the volume of inductors for low-power grid-tied inverter applications. Unlike the controllers designed for continuous current mode operations, current controllers for DCM are required to address their nonlinear characteristics. A feed-forward controller can be a good choice for the current control of the grid-tied inverters operated in DCM. However, distortions in the output current cannot be eliminated, and they can be more severe if devices with large output capacitance are applied. Two harmonic current reduction strategies, namely a partial feedback path and an improved modulation, are proposed to reduce the low-and high-order harmonics for single-phase grid-tied inverters operated in DCM. The proposed strategies are discussed and verified by a laboratory prototype in some experiments. It is indicated that the proposed modulation can mitigate the influence of device parasitic capacitance on current distortion and expand the device selections.

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Hybrid Discontinuous/Boundary Conduction Mode of Flyback Microinverter for AC–PV Modules

Cited by 64 publications

References 34 publications

Analysis and implementation of a new zero current switching flyback inverter

Analysis and implementation of a new zero current switching flyback inverter

A new adaptive clamp for improving weighted efficiency in grid‐tied photovoltaic interleaved two‐switch flyback micro‐inverter

Reduction of harmonic current distortion for single‐phase grid‐tied inverter operated in discontinuous current mode

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