High Efficiency LLC Resonant Converter with High Voltage Gain Using Auxiliary LC Resonant Circuit

Kim, Dong-Kwan; Moon, SangCheol; Yeon, Cheol-O; Moon, Gun-Woo

doi:10.1109/tpel.2015.2510380

Cited by 77 publications

(30 citation statements)

References 22 publications

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“…For the ZVS operation of the primary switches, according Figs. 8 and 9, the ZVS operation is guaranteed when the variable resonant inductor L r is at the right side of the peak voltage gain operation point, which can be expressed as (9) To guarantee the ZCS operation of thesecondary rectifier, the switching frequency should be lower than the series resonant frequency during the whole operation range, so the following inequity should be satisfied.…”

Section: Soft Switchingmentioning

confidence: 99%

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Comprehensive Analysis and Design of LLC Resonant Converter With Magnetic Control

Wei¹,

Luo²,

Mantooth³

2019

CPSS TPEA

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Conventionally, LLC resonant converter adopts frequency control (FC) or combine FC with phase shift control (PSC) to regulate the output voltage. However, for both control strategies, a variable switching frequency operation range is required, which makes the magnetic component and driver circuit design complicated. In this paper, the magnetic control (MC) or variable inductor control is adopted for the LLC resonant converter. Thanks to MC, constant switching frequency and duty cycle can be implemented for the primary switches. A comprehensive analysis of the magnetically controlled LLC resonant converter is presented, which includes the operation principle, voltage gain, and soft switching operation. Meanwhile, a design methodology for LLC resonant converter with MC is proposed, especially the design considerations for the variable inductor are discussed. By adopting the proposed design methodology, the zero voltage switching (ZVS) operation for the primary switches and the zero current switching (ZCS) operation for the secondary rectifier can be achieved. Finally, a 200 W experimental setup is built to validate the theoretical analysis.

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Section: Soft Switchingmentioning

confidence: 99%

“…From the control strategy point of view, frequency control (FC) is the most frequently used control strategy for the LLC resonant converter [8], [9]. By adjusting the switching frequency, the input impedance of the resonant network can be modified, and finally the converter output voltage can be regulated.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis and Design of LLC Resonant Converter With Magnetic Control

Wei¹,

Luo²,

Mantooth³

2019

CPSS TPEA

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show abstract

“…Furthermore, compared with a series resonant converter (SRC), a parallel resonant converter (PRC) and a series-parallel resonant converter (SPRC) [5,6], LLC resonant convertors allow a narrow switching frequency variation during the output load and input voltage variation [7,8]. Therefore, the LLC resonant converter can be simpler to design an electromagnetic interference (EMI) filter [9][10][11]. Unfortunately, the LLC resonant converter still has some issues to be solved [12,13], such as short output circuit and overload conditions will cause a large peak in current through the switches of the primary-side.…”

Section: Introductionmentioning

confidence: 99%

A Novel Multi-Element Resonant Converter with Self-Driven Synchronous Rectification

Lin

Lee

2019

Energies

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This paper proposes a novel multi-element resonant converter with self-driven synchronous rectification (SR). The proposed resonant converter can achieve a zero-voltage-switching (ZVS) operation from light load to full load, meanwhile, the zero-current-switching (ZCS) can achieve rectifiers of a secondary-side. Therefore, the switching losses can be significantly reduced. Compared with an LLC resonant converter, the proposed resonant converter can be effective to decrease the circulating energy through the primary-side of the transformer to output a load and provide a wide voltage gain range for over-current protection as well as decreasing the inrush current under the start-up condition. Moreover, the proposed converter uses a simple current detection scheme to control the synchronous rectification switches. A detailed analysis and design of this novel multi-element resonant converter with self-driven synchronous rectification is described. Finally, a DC input voltage of 380-VDC and an output voltage/current of 12-VDC/54-A for the resonant converter prototype is built to verify the theoretical analysis and performance of the proposed converter.

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“…Compared with the conventional LLC resonant converter, this design developed more operating modes, such as the increased flexibility to minimize the magnetizing current and reducing copper and iron loss from the transformer to enhance overall efficiency; however, the auxiliary circuit, winding of the dual transformers, and two rectification output stages complicate the circuit. An auxiliary LC circuit (containing an inductor and a capacitor) was used in [21], which functioned as a variable inductor, providing substantial magnetizing inductance at all times according to the switching frequency to reduce the circulating current of the LLC resonant converter, thereby improving the overall efficiency. Nonetheless, the transformer size becomes larger than that of a conventional LLC resonant converter if the LC auxiliary coil should be winded into the transformer.…”

Section: Introductionmentioning

confidence: 99%

Adaptive DC-Link Voltage Control of LLC Resonant Converter

2018

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High Efficiency LLC Resonant Converter with High Voltage Gain Using Auxiliary LC Resonant Circuit

Cited by 77 publications

References 22 publications

Comprehensive Analysis and Design of LLC Resonant Converter With Magnetic Control

Comprehensive Analysis and Design of LLC Resonant Converter With Magnetic Control

A Novel Multi-Element Resonant Converter with Self-Driven Synchronous Rectification

Adaptive DC-Link Voltage Control of LLC Resonant Converter

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