High-Efficiency Three-Level DC–DC Converter With Reduced Circulating Current and Rectifier Voltage Stress

Kim, Keon-Woo; Han, Jung-Kyu; Lee, Byoung-Hee; Moon, Gun-Woo

doi:10.1109/tpel.2019.2925462

Cited by 12 publications

(4 citation statements)

References 29 publications

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“…Although ZCS technique can significantly reduce the tail current of the IGBTs, the maximum switching frequency of the IGBTs limits the magnetic components and space-constrained design. The converters in [24][25][26][27][28][29][30] use two half bridges to form the TL structure. Although it can eliminate the circulating current, in the primary side auxiliary circuit is also added to limit the ringing of the In this paper, a novel TL DC/DC converter with wide ZVS range, reduced circulating current and low filter requirement is proposed.…”

Section: Introductionmentioning

confidence: 99%

A series-connected asymmetrical PWM half-bridge three-level converter with reduced circulating current

Zhang

Chen

Zhao

et al. 2022

IEICE Electron. Express

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A novel three-level (TL) converter topology is proposed in this paper. The primary side of the proposed converter consists of two asymmetric half-bridge inverters, which are connected in series. The rectifier stage is composed of two parallel full-bridge-rectifier (FBR) which use the same diodes as the common current path. The asymmetrical-PWM control is employed to regulate output voltage. Compared with the traditional TL converters, the circulating current can be significantly reduced. Moreover, all the switches can achieve ZVS performance with a small leakage inductor over wide load range. The parallel connection of the two FBR also helps to reduce the current ripple of the filter inductor, leading to high density switching converter design. In this paper, a laboratory prototype(480-600 Vdc input, 96Vdc/12A output) based on the proposed converter is built to validate the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

A series-connected asymmetrical PWM half-bridge three-level converter with reduced circulating current

Zhang

Chen

Zhao

et al. 2022

IEICE Electron. Express

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show abstract

“…In [24], a parallel-switch topology composed of two series half-bridges sharing the same transformer was presented for the high-voltage input as well. Likewise, to relieve the voltage stress of the switches on the secondary side, a NPC TL was utilized on the output to build a 800-V bidirectional extreme fast-charging (XFC) OBC for the EV [25]. However, these multi-level topologies always have more than two switches conducting and enduring the same conducting current, which achieves lower voltage stress at the expense of high conduction loss.…”

Section: Introductionmentioning

confidence: 99%

Design of hybrid SiC/Si based T‐type three‐level LLC$ LLC$ resonant converter with wide‐input range and low conduction loss for automotive auxiliary power module

Yin

et al. 2022

IET Power Electronics

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The auxiliary power module (APM) in the electrical vehicle converts the high voltage of battery pack to the low voltage to supply the electric power for the internal loads, including electric power steering, electric turbo, headed windshield and cooling pumps. The increasing demands on charging time and mileage have made the battery packs with even higher voltage (e.g. 800 V) a promising option. However, it brings a new challenge for the APM, and either the 1.2‐kV silicon carbide (SiC) device or the three‐level (TL) topology are used conventionally. This work proposes a cost‐effective hybrid SiC/Si‐based T‐type TL LLC$ LLC$ resonant converter for the vehicular APM application with a high step‐down ratio. The 1.2‐kV SiC and 650‐V Si devices are used as the main and auxiliary switches, respectively. It fully utilizes the voltage rating of device, and also improves the efficiency compared with conventional TL topology. To improve the gain range and electromagnetic interference performance, a variable frequency and adjustable phase‐shift modulation scheme is adopted. At the same time, the steady‐state time‐domain model is established to elaborate the operation principles, topology features, and boundary conditions for soft‐switching. Furthermore, the precise solutions for switching frequency and phase‐shift angle are figured out. Finally, the effectiveness of model is verified by the simulation as well as the experiment. A 1‐kW prototype for the application in the APM is demonstrated with the input voltage of 640–840 V and a constant output of 48 V/ 21 A.

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“…Firstly, the size of the power density is the key to portability and practicality. The trend of the smaller the size of the adapter and the greater the power results in that the requirements for power density are greatly improved [1]- [4]. Secondly, as energy efficiency is increasingly being valued, energy conservation is a hot topic around the world.…”

Section: Introductionmentioning

confidence: 99%

28.4cc ultra-density 65W type-C adaptor with current mirror integration method

Lyu¹,

Wang²,

Chen³

et al. 2022

IEICE Electron. Express

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With the increasing requirements for charging speed of portable electronic products and the demand for portable performance, the fast-charging adapter industry is facing challenges. Adapters mainly have the problems of being too large in volume, low power density and low charging efficiency. This paper introduces an ultradensity adaptor for type-c power delivery (PD) applications. The principle of active clamp flyback converter (ACF) is explained briefly. Advanced technology with Gallium nitride (GaN) devices and novel ACF controller are applied. Power density is increased by current mirror integration method. It can achieve high efficiency, especially at low line input. Finally, a 28.4cc 65W prototype based on GaN Power IC and ACF controller was made with EMI CE passing. The efficiency at full load reaches about 93% with current mirror integration method.

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High-Efficiency Three-Level DC–DC Converter With Reduced Circulating Current and Rectifier Voltage Stress

Cited by 12 publications

References 29 publications

A series-connected asymmetrical PWM half-bridge three-level converter with reduced circulating current

A series-connected asymmetrical PWM half-bridge three-level converter with reduced circulating current

Design of hybrid SiC/Si based T‐type three‐level LLC$ LLC$ resonant converter with wide‐input range and low conduction loss for automotive auxiliary power module

28.4cc ultra-density 65W type-C adaptor with current mirror integration method

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