Phase-Shifted Active Clamp Flyback Converter For Driving a Magnetron

Nasiri, Abolfazl; Banaei, Mohamad Reza; Abadi, Ali Saadat Saadat

doi:10.1109/iraniancee.2019.8786649

Cited by 3 publications

(5 citation statements)

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“…In the majority of literature published so far the ACFs were either supplied from rectified single-phase mains or from batteries (<60 V) [19], [20]. Only few papers had ACF with high-output voltage (>450 V) in exotic applications [21], [22].…”

Section: Introductionmentioning

confidence: 99%

Active-Clamp Flyback Converter as Auxiliary Power-Supply of an 800 V Inductive-Charging System for Electric Vehicles

Vracar

Pejović

2022

IEEE Access

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Investigation of active-clamped flyback (ACF) dc-dc converter 57 W used as the auxiliary power-supply (APS) of an inductive-charging system (ICS) is presented. The ACF was supplied from variable-dc-link 800 V which was challenge for its design. Anyway, some findings are applicable to any ACF. An overview of ACF control ICs is presented revealing that only two vendors have appropriate devices for ICS. The key-parts' choice and suggestion of new features targeting ACF in this emerging-application are given. Striving for high switching-frequency in ICS is not needed due to large safety-distances of transformer. Measured ''maximum-efficiency vs. magnetizing-inductance'' graph showed that extremes are reached for 400 µH. It was based on four transformers with manually-optimized resonant-tanks. Measurements of ''circulating-power losses vs. input-voltage'' are compared for several transformers. Those losses are in the range of few watts and increase with input-voltage. Measurements of ''bandwidth, phase-margin and gain-margin vs. input-power'', for different input-voltages, are discussed. Those quantities were changeable with load and input-voltage as expected. The short-circuit behavior is analyzed showing that usage of the hybrid-clamp with multi-mode control-ICs is mandatory. Finally, comparison with conventional flyback and quasi-resonant flyback converters showed that both are ≈23 % cheaper, occupy ≈11 % less board-space, and have similar or higher efficiencies. The reason for such efficiency is that ACF circulating-power losses were high as well as dc-voltage-conversion-ratio. Although this is a drawback, for an APS the efficiency is not the key-parameter as long as there are no thermal problems. Moreover, as ACF converter is known for having less EMI-problems that could be the key-advantage for this application. But problem is not-enough electronic components on the market that are suitable for ICS.INDEX TERMS Active-clamped flyback, auxiliary power-supply, control, dc-dc converter, inductive charging-system, quasi-resonant flyback. NOMENCLATURE ACF active-clamped flyback. ACM active-clamping mode. APS auxiliary power-supply. CCM continuous conduction-mode. DCM discontinuous conduction-mode. EMI electro-magnetic interference. EV electric vehicle. FET field-effect transistor.The associate editor coordinating the review of this manuscript and approving it for publication was Alfeu J. Sguarezi Filho .

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Section: Introductionmentioning

confidence: 99%

Active-Clamp Flyback Converter as Auxiliary Power-Supply of an 800 V Inductive-Charging System for Electric Vehicles

Vracar

Pejović

2022

IEEE Access

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“…where D is the duty ratio of the switch S 1 . By utilising the voltsecond balance law of the magnetising inductance as (16), voltage gain can be written as (17):…”

Section: Voltage Gain Expressionmentioning

confidence: 99%

“…In other words, when V PV = 0, the voltage across the PV capacitor can be controlled to produce the desired output voltage. Therefore, by substituting (15) in (17), the equation can be written as follows:…”

Section: Voltage Gain Expressionmentioning

confidence: 99%

“…According to (15) and (17), the output voltage of the presented converter depends on the voltage of PV V PV , the voltage of the battery V bat , and turn ratio of the coupled inductors n, n′ . Furthermore, the voltage of PV power depends on environmental conditions and the voltage of the battery depends on its charge level.…”

Section: Design Issuementioning

confidence: 99%

“…Considering the mentioned drawbacks of fully isolated converters, non-isolated converters are suitable in applications, which the isolation is not needed. Since the output voltage of renewable energy sources like PV and fuel cell are too low, various high stepup methods like coupled inductors switched capacitor cells and isolated transformer have been developed for voltage gain improvement [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New soft‐switched high gain three‐port DC–DC converter with coupled inductors

Saadabad

Hosseini

Nasiri

et al. 2020

IET power electron.

Self Cite

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In this study, a new high step-up non-isolated three-port DC-DC converter is proposed. A bidirectional buck-boost converter is used to interface photovoltaic battery and non-isolated load port. Compared to the other three-port converters, the presented topology has fewer component counts, which is the main merit of the proposed converter. The output voltage of the converter can be increased by using a three winding coupled inductor, a diode and a capacitor. Furthermore, since both main switches are turned on with zero voltage switching, switching losses is reduced and the efficiency of the converter is improved. Maximum power point tracking and maintaining the output voltage at a suitable level during the charging and discharging of the battery can be achieved by a simple controller. Moreover, according to the load power demand, three power flow paths will occur. The operation principle will be described in detail for three modes. Finally, the experiments with 400 W, 100 W, 40 V/400 V are implemented to verify the effectiveness of the converter.

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A High-Efficiency QR Flyback DC–DC Converter with Reduced Switch Voltage Stress Realized by Applying a Self-Driven Active Snubber (SDAS)

Yoo

Baek²,

Ahn

2023

Energies

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In this paper, a QR flyback converter using a self-driven active snubber (SDAS) was proposed to solve the problem of voltage surge in the switch of QR flyback converters. In the proposed converter, the SDAS consisting of a clamping capacitor and an active switch can be configured in parallel with the main switch or transformer to reduce the voltage surge in the switch. To confirm the steady-state characteristics of the QR flyback converter to which the proposed SDAS is applied, equivalent circuits for each state were constructed, and the equations and characteristics for each state were determined. A 60 W class small AC–DC adapter was constructed to confirm the effectiveness of the proposed converter and the control circuit method, and the experimental results were analyzed. The size of the experimental AC–DC adapter was 74×29×23 mm, and it had a high power density of 20 W/in3 or more. The experimental circuit was limited to the high power conversion efficiency of up to 91.56%, and the maximum voltage surge in the switch was approximately 450 V. One of the reasons for such high efficiency is the SDAS circuit, which sufficiently reduces the voltage surge of the QR flyback switch, compared with the RCD clamp circuit, and does not consume power in principle.

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Phase-Shifted Active Clamp Flyback Converter For Driving a Magnetron

Cited by 3 publications

References 10 publications

Active-Clamp Flyback Converter as Auxiliary Power-Supply of an 800 V Inductive-Charging System for Electric Vehicles

Active-Clamp Flyback Converter as Auxiliary Power-Supply of an 800 V Inductive-Charging System for Electric Vehicles

New soft‐switched high gain three‐port DC–DC converter with coupled inductors

A High-Efficiency QR Flyback DC–DC Converter with Reduced Switch Voltage Stress Realized by Applying a Self-Driven Active Snubber (SDAS)

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