• Title/Summary/Keyword: EV Charger

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A Bridgeless Single Stage AC-DC Converter for Wireless Power Charging System (무선전력충전시스템을 위한 브리지리스 단일전력단 교류-직류 컨버터)

  • Kim, Min-Ji;Yoo, Sang-Jae;Yoo, Kyung-Jong;Woo, Jung-Won;Kim, Eun-Soo;Hwang, In-Gab
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.1
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    • pp.44-53
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    • 2020
  • A bridgeless single-stage AC-DC converter for wireless power charging systems is proposed. This converter is composed of a PFC stage and a three-level hybrid DC-DC stage. The proposed converter can control the wide output voltage (200-450 VDC) by the variable link voltage and the pulse-width voltage applied to the primary resonant circuit due to the phase-shifted modulation at a fixed switching frequency. Moreover, the input power factor and the total harmonic distortion can be improved by using the proposed converter. A 1 kW prototype was fabricated and validated through experimental results and analysis.

Three Level Single-Phase Single Stage AC/DC Resonant Converter With A Wide Output Operating Voltage Range (넓은 출력 전압제어범위를 갖는 3레벨 단상 단일전력단 AC/DC 컨버터)

  • Marius, Takongmo;Kim, Min-Ji;Oh, Jae-Sung;Lee, Gang-Woo;Kim, Eun-Soo;Hwang, In-Gab
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.6
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    • pp.424-432
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    • 2018
  • This study presents a single-phase single-stage three-level AC/DC converter with a wide controllable output voltage. The proposed AC/DC converter is designed to extend the application of e-mobility, such as electric vehicles. The single-stage converter integrates a PFC converter and a three-level DC/DC converter, operates at a fixed frequency, and provides a wide controllable output voltage (approximately 200-430Vdc) with high efficiencies over a wide load range. In addition, the input boost inductors operate in a discontinuous mode to improve the input power factor. The switching devices operate with ZVS, and the converter's THD is small, especially at full load. The feasibility of the proposed converter is verified by the experimental results of a 1.5 kW prototype.

Optimal Supply Calculation of Electric Vehicle Slow Chargers Considering Charging Demand Based on Driving Distance (주행거리 기반 충전 수요를 고려한 전기자동차 완속 충전기 최적 공급량 산출)

  • Gimin Roh;Sujae Kim;Sangho Choo
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.23 no.2
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    • pp.142-156
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    • 2024
  • The transition to electric vehicles is a crucial step toward achieving carbon neutrality in the transportation sector. Adequate charging infrastructure at residential locations is essential. In South Korea, the predominant form of housing is multifamily dwellings, necessitating the provision of public charging stations for numerous residents. Although the government mandates the availability of charging facilities and designated parking areas for electric vehicles, it bases the supply of charging stations solely on the number of parking spaces. Slow chargers, mainly 3.5kW charging outlets and 7kW slow chargers, are commonly used. While the former is advantageous for installation and use, its slower charging speed necessitates the coexistence of both types of chargers. This study presents an optimization model that allocates chargers capable of meeting charging demands based on daily driving distances. Furthermore, using the metaheuristic algorithm Tabu Search, this model satisfies the optimization requirements and minimizes the costs associated with charger supply and usage. To conduct a case study, data from personal travel surveys were used to estimate the driving distances, and a hypothetical charging scenario and environment were set up to determine the optimal supply of 22 units of 3.5kW charging outlets for the charging demands of 100 BEVs.