A Modified High-Efficiency LLC Converter With Two Transformers for Wide Input-Voltage Range Applications

Hu, Haibing; Fang, Xiang; Chen, Fanglin; Shen, Z. John; Batarseh, Issa

doi:10.1109/tpel.2012.2201959

Cited by 288 publications

(113 citation statements)

References 23 publications

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“…Alternatively, if the gap is only in the center-post, and this gap dominates the reluctance of the core, the magnetizing inductance is theoretically unaffected by the transition to HB/0 mode. The capability to use HB/0 mode to invoke a change in magnetizing inductance may be a useful feature in some resonant topologies where it can provide a mechanism for changing the voltage gain curve for a fixed load [16].…”

Section: A Fb/fb and Hb/hb Modesmentioning

confidence: 99%

Variable-inverter-rectifier-transformer: a hybrid electronic and magnetic structure enabling adjustable high step-down conversion ratios

Ranjram

Moon

Perreault

2017

2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Abstract-This paper proposes a hybrid electronic and magnetic structure that enables transformers with "fractional" and reconfigurable turns ratios (e.g. 12:0.5, 12:1, 12:2). This functionality is valuable in converters with wide operating voltage ranges and high step-up/down, as it offers a means to reduce copper loss within the transformer while also facilitating voltage doubling and quadrupling. We introduce the principle of operation of the structure and present models for its magnetic and electrical behaviour. An experimental prototype capable of accommodating a widely varying input (120-380 V dc ) and output (5, 9, 12V) validates the operating principle and modelling of the proposed structure and achieves conversion efficiencies between 93.4% and 95.7% at 25-36 W.

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Section: A Fb/fb and Hb/hb Modesmentioning

confidence: 99%

Variable-inverter-rectifier-transformer: a hybrid electronic and magnetic structure enabling adjustable high step-down conversion ratios

Ranjram

Moon

Perreault

2017

2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL)

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“…However, because the LLC converter with a wide input voltage range must have a small magnetizing inductance to obtain a high peak gain, large conduction losses arise in the converter primary side. Thus, the LLC converter can achieve high efficiency and high power density only if operating at around the resonant frequency, resulting in a very narrow input voltage range and limited output voltage regulation capability [20][21][22]. However, the proposed converter achieves the regulation of the DC output voltage using the phase-shift method with the fixed switching frequency.…”

Section: Operational Principlesmentioning

confidence: 99%

Simple High Efficiency Full-Bridge DC-DC Converter using a Series Resonant Capacitor

Jeong¹,

Kwon²,

Park³

2016

Journal of Electrical Engineering and Technology

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-This paper presents a simple high efficiency full-bridge DC-DC converter using a series resonant capacitor. The proposed converter achieves the zero voltage switching of the primary switches under a wide range of load conditions and reduces the high circulating current in the freewheeling mode using the leakage resonant inductance and the series resonant capacitor. Thus, the proposed converter overcomes the drawbacks of the conventional full-bridge DC-DC converter and improves its overall system efficiency. Its structure is simplified by using the leakage inductance of the transformer as the resonant inductance and omitting the DC output filter inductance. Also it can operate over a wide range of input voltages. In this paper, the operational principle, analysis and design example are described in detail. Finally, the experimental results from a 650W (24V/27A) prototype are demonstrated to confirm the operation, validity and features of the proposed converter.

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“…Wide input DC/DC converters have large applications, especially in new energy power generations, such as photovoltaics, wind, fuel cell etc [1][2][3][4]. LLC resonant DC/DC converter can achieve Zero voltage switching (ZVS) for the primary side switches and zero current switching (ZCS) for the secondary side diodes by resonance existing in the resonant tank, and can be used as boost power stage in the new energy power generation.…”

Section: Introductionmentioning

confidence: 99%

“…But when using traditional PFM control for wide input voltage, great challenges in magnetic components, system stability, and system control will occur because of the wide-range switching frequency resulted from a wide input voltage and wide load variation. References [2,[5][6][7][8][9][10] proposed some topologies, control schemes and design for wide-input voltage LLC converters. By using hybrid control shown as Control II in Fig.1-(b), efficient power conversion can be realized for wide input voltage [10].…”

Section: Introductionmentioning

confidence: 99%

New hybrid control for wide input full-bridge LLC resonant DC/DC converter

Xiao

Mao

Zhang

et al. 2018

2018 3rd International Conference on Intelligent Green Building and Smart Grid (IGBSG)

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Abstract-In order to achieve low switching frequency range and high efficiency for a wide-input LLC resonant converter, a new hybrid control combining pulse-frequency modulation (PFM) and phase-shift pulse-width modulation (PS-PWM) is proposed. In the new control, the LLC converter has two operation modes, i.e PFM and PFM+PS-PWM. The new control scheme and operation principle is analyzed deeply, and then efficiency optimization can be carried out by the proposed design procedure for the resonant tank of LLC converter. Finally, a prototype is developed with input voltage range from 22V to 45V, and rated power of 250W and output voltage of 380V. The experiment shows that the peak efficiency of LLC converter reaches to 96.2%, and verifies the proposed control scheme, design.

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A Modified High-Efficiency LLC Converter With Two Transformers for Wide Input-Voltage Range Applications

Cited by 288 publications

References 23 publications

Variable-inverter-rectifier-transformer: a hybrid electronic and magnetic structure enabling adjustable high step-down conversion ratios

Variable-inverter-rectifier-transformer: a hybrid electronic and magnetic structure enabling adjustable high step-down conversion ratios

Simple High Efficiency Full-Bridge DC-DC Converter using a Series Resonant Capacitor

New hybrid control for wide input full-bridge LLC resonant DC/DC converter

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