Universal Bridgeless Nonisolated Battery Charger With Wide-Output Voltage Range

Karneddi, Harish; Ronanki, Deepak

doi:10.1109/tpel.2022.3217943

Cited by 30 publications

(3 citation statements)

References 12 publications

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“…The losses of a conventional NPC converter are incomparable to the RNPC or the ANPC and make it unsuitable for topology morphing control at high RMS current levels. Multiple strategies have been proposed in the literature to increase the voltage range of resonant power converters; however, they utilize additional relays or contactors for reconfiguration [11,25,26]. The proposed reconfiguration method does not require any additional relays or contactors and is solid-state in nature.…”

Section: A Reconfigurable Neutral-point Clamped Convertermentioning

confidence: 99%

A 15-kW Wide-Input Reconfigurable Three-Level DAB Converter for On-Board Charging of 1.25-kV Electric Vehicle Powertrains

Pradhan,

Shah,

Hassan

et al. 2024

IEEE Trans. Transp. Electrific.

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The demand to reduce charging times and runtime losses in electric vehicles has created a push to increase battery pack's voltage level. 800 V class vehicles in production are approaching the 1 kV voltage limit of the Combined Charging System (CCS) connector. New fast charging standards such as ChaoJi (CHAdeMO 3.0) and Megawatt Charging System (MCS) have voltages defined up to 1.5 kV and 1.25 kV, respectively. The SAE J3068 standard, focused on 3-Φ AC charging, recommends compatibility from 208/120Y to 600/347Y, resulting in a wide voltage variation of the power factor correction (PFC) stage's DC link. This paper proposes a reconfiguration method of a neutralpoint clamped (NPC) converter in a three-level dual active bridge (DAB) converter to accommodate the wide voltage swing. The reconfigurable three-level DAB converter (R3L-DAB) topology is introduced, and its modes of operation are presented. The steady-state analysis and its soft-switching criterion are discussed. A power loss model and design methodology are established to choose the switching frequency (fsw), turns ratio (n), and leakage inductance (L k ). Finally, the experimental results of a 15 kW R3L-DAB converter, with a power density of 3.25 kW/L and peak efficiency of 97.32% are presented.

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Section: A Reconfigurable Neutral-point Clamped Convertermentioning

confidence: 99%

A 15-kW Wide-Input Reconfigurable Three-Level DAB Converter for On-Board Charging of 1.25-kV Electric Vehicle Powertrains

Pradhan,

Shah,

Hassan

et al. 2024

IEEE Trans. Transp. Electrific.

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“…Until the 1970s, with the invention of IGBT tubes that can withstand high voltage and high current, the development of charger power supply reached a new level. Switching power supply efficiency and power density are very high, very suitable for high power charger [23], [24], [25], [26]. Because of the urgent needs of the fast charging market, the charging power requirements of on-board chargers are increasing day by day, and modular design has become the mainstream development trend of chargers.…”

Section: Design and Loss Analysis Of Fast Charging Optimization Circu...mentioning

confidence: 99%

DC Charger Circuit Optimization Design and Fast Charging and Discharging Mechanism Research

Shen,

Yan,

Zhou

et al. 2023

IEEE Access

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With the advent of the era of new energy vehicles, the layout of charging piles is slightly lagging behind, and the charging efficiency of chargers is uneven, which leads to the problems of difficult charging and long charging time of electric vehicles. Therefore, market users put forward higher requirements for the charging efficiency of chargers. This paper first analyzes the circuit design principle and loss of the traditional charger, then designs a zero voltage switch(ZVS) half-bridge three-level DC/DC converter with high charging efficiency, and proposes a multi-stage constant current limiting charging strategy. Finally, through simulation and experimental verification, it is proved that the proposed strategy can strengthen the voltage regulation ability of the charger, and can achieve a stable current sharing state when charging.INDEX TERMS Circuit design, charging strategy, DC/DC charger, working loss.

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“…The battery voltage of PMDs has a wide range depending on the type of PMDs such as electric scooters, electric bicycles, and electric skateboards. In general, individual battery chargers according to the type of PMDs are used to charge the battery of PMDs with a single rated voltage [14]- [16]. The individual battery chargers reduce industrial usability and availability of PMDs.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristic Improvement of Battery Charger for PMDs Using a Model Predictive Control

Moon,

Bak

2024

IEEE Access

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This paper proposes a dynamic characteristics improvement of battery charger for personal mobility devices (PMDs) using a model predictive control (MPC). The battery charger is used to charge a battery of PMDs such as electric scooters, electric bicycles, and electric skateboards and an output voltage of the battery charger is generally controlled by a proportional-integral (PI) controller. The PI controller requires a gain tuning to improve a dynamic characteristic, however, an overshoot of the output voltage can be occurred in transient state when the gain is increased. Therefore, to improve the dynamic characteristic of the battery charger for PMDs, this paper presents the MPC method to control the output voltage of the battery charger for PMDs. The effectiveness of the proposed MPC method is proved by the simulation and experimental results.INDEX TERMS Battery charger, personal mobility devices (PMDs), model predictive control (MPC) method, dynamic characteristic.

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Universal Bridgeless Nonisolated Battery Charger With Wide-Output Voltage Range

Cited by 30 publications

References 12 publications

A 15-kW Wide-Input Reconfigurable Three-Level DAB Converter for On-Board Charging of 1.25-kV Electric Vehicle Powertrains

A 15-kW Wide-Input Reconfigurable Three-Level DAB Converter for On-Board Charging of 1.25-kV Electric Vehicle Powertrains

DC Charger Circuit Optimization Design and Fast Charging and Discharging Mechanism Research

Dynamic Characteristic Improvement of Battery Charger for PMDs Using a Model Predictive Control

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