High-Efficiency Asymmetric Forward-Flyback Converter for Wide Output Power Range

Lee, Hyeon-Seok; Choe, Hyung-Jin; Ham, Seok-Hyeong; Kang, Bongkoo

doi:10.1109/tpel.2016.2537930

Cited by 26 publications

(8 citation statements)

References 20 publications

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“…ω1 is the angular frequency of the AC input voltage. In this mode, the angular frequency ω and the impedance Z are also shown in Equation (3). As shown in Figure 5, in this mode, S 1 still turns on.…”

Section: Mode 1-(t0 < T < T1)mentioning

confidence: 92%

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Design and Implementation of a Single-Stage PFC Active-Clamp Flyback Converter with Dual Transformers

Cheng

2021

Electronics

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This paper proposes an AC/DC single-stage structure by integrating a boost topology and an active clamp flyback (ACF) circuit with power-factor-correction (PFC) function. The PFC function can be achieved by controlling a boost PFC topology operated in the discontinuous conduction mode. With the coordination of active clamping components, a resonant technique is obtained and zero-voltage-switching (ZVS) can be achieved. The proposed converter is combined with the advantages of: (1) compared with two-stage circuit, a single stage circuit decreases the component of the main circuit and reduces the complexity of the control circuit; (2) a boost topology with PFC function operated in discontinuous conduction mode can be accomplished without adding any current detecting technique or detecting input signal; (3) by using the inductor from the PFC stage, ZVS function can be achieved without any additional inductor; (4) the increment of switching frequency facilitates the optimization of power density; (5) the conducting loss at the secondary side can be reduced by adding the synchronous rectification; (6) in this proposed scheme, the dual transformers with series-parallel connection are utilized, the current at the secondary side can be shared for lowering the conduction loss of the synchronous transistors. Finally, a prototype converter with AC 110 V input and DC 19 V/6.32 A (120 W) output under 300 kHz switching frequency is implemented. The efficiency of the proposed converter reaches 88.20% and 0.984 power factor in full load condition.

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Section: Mode 1-(t0 < T < T1)mentioning

confidence: 92%

“…Flyback converters [1][2][3] are the most commonly used in low power electronics applications and consumer products, such as smart phone chargers, adaptors for laptops, and electric scooter battery chargers. The active-clamp techniques [4][5][6][7] have improved several drawbacks of the conventional flyback converter topology.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Single-Stage PFC Active-Clamp Flyback Converter with Dual Transformers

Cheng

2021

Electronics

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“…To complement large circulating current of the conventional PSFB converter, many active-clamp-forward (ACF) converters have been studied [12][13][14][15][16][17][18][19]. These ACF converters have advantages of the zero circulating current and low number of switches, which results in lower conduction loss compared to the conventional PSFB converter.…”

Section: Introductionmentioning

confidence: 99%

“…However, despite of low conduction loss, these converters suffer from high voltage stress on the primary switches, which becomes far worse taking into account wide input voltage range. As a result, the ACF converters in [12][13][14][15][16][17][18][19] should use low performance of Si-MOSFETs increasing conduction loss and switching loss. In order to improve this drawback and achieve high efficiency, the ACF converters can adopt silicon-carbide (SiC) MOSFETs which has high voltage rating, small on-resistance, and small parasitic capacitance.…”

Section: Introductionmentioning

confidence: 99%

Full-Bridge Active-Clamp Forward-Flyback Converter with an Integrated Transformer for High-Performance and Low Cost Low-Voltage DC Converter of Vehicle Applications

Baek

Youn

2020

Energies

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This paper presents a full-bridge active-clamp forward-flyback (FBACFF) converter with an integrated transformer sharing a single primary winding. Compared to the conventional active-clamp-forward (ACF) converter, the proposed converter has low voltage stress on the primary switches due to its full-bridge active-clamp structure, which can leverage high performance Silicon- metal–oxide–semiconductor field-effect transistor (Si-MOSFET) of low voltage rating and low channel resistance. Integrating forward and flyback operations allows the proposed converter to have much lower primary root mean square (RMS) current than the conventional phase-shifted-full-bridge (PSFB) converter, while covering wide input/output voltage range with duty ratio over 0.5. The proposed integrated transformer reduces the transformer conduction loss and simplify the secondary structure of the proposed converter. As a result, the proposed converter has several advantages: (1) high heavy load efficiency, (2) wide input voltage range operation, (3) high power density with the integrated transformer, and (4) low cost. The proposed converter is a very promising candidate for applications with wide input voltage range and high power, such as the low-voltage DC (LDC) converter for eco-friendly vehicles.

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“…Combining the flyback and forward converters make a new topology providing the advantages of both flyback and forward converters and eliminates some issues [7,[23][24][25][26][27][28][29][30][31][32][33]. Also, the model of the energy transferring from the primary to the secondary side changes by using the flyback-forward converter.…”

Section: Introductionmentioning

confidence: 99%

Design, modelling, and implementation of a modified double‐switch flyback‐forward converter for low power applications

Eshkevari¹,

Mosallanejad

Sepasian

2019

IET Power Electronics

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This study proposes a modified double-switch flyback-forward (DSFF) converter for low-power applications with a reduced number of windings in its transformer. This circuit has resulted from the combination of the two-switch flyback and twoswitch forward converters. It includes a simple transformer with one set of secondary side windings, and it is not necessary to design two separate sets of windings for the desired output voltage which is the main problem of other flyback-forward converters. An auxiliary winding has been designed for self-biasing, and consequently, it improves the overall efficiency in the no-load condition. Due to the modifications on the previously presented two-switch flyback-forward converter, the circuit model has changed. This study, first, analyses the operation of the proposed converter in detail, then it explains a method to design this converter in continuous inductor current mode. Also, a start-up voltage regulator circuit and a modified bootstrap gate driver will be investigated, and the DC and AC model of the converter will be presented. Experimental results validate the proposed DSFF converter. The tested circuit includes a DSFF converter, a pulse generator circuit, a start-up voltage regulator, and a modified bootstrap gate driver.

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High-Efficiency Asymmetric Forward-Flyback Converter for Wide Output Power Range

Cited by 26 publications

References 20 publications

Design and Implementation of a Single-Stage PFC Active-Clamp Flyback Converter with Dual Transformers

Design and Implementation of a Single-Stage PFC Active-Clamp Flyback Converter with Dual Transformers

Full-Bridge Active-Clamp Forward-Flyback Converter with an Integrated Transformer for High-Performance and Low Cost Low-Voltage DC Converter of Vehicle Applications

Design, modelling, and implementation of a modified double‐switch flyback‐forward converter for low power applications

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