Architecture and Control of An Interleaved 6-Level Bidirectional Converter With an Active Energy Buffer for Level-II Electric Vehicle Charging

On-board electric vehicle (EV) chargers convert grid ac voltage to dc voltage to charge a high-voltage battery pack. High efficiency and high power density single-phase ac-dc converters are desirable in such applications to reduce the heat loss, volume and weight of these chargers. Moreover, the cap...

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Main Authors: Liao, Zitao, Chou, Derek, Fernandez, Kelly, Syu, Yong-Long, Pilawa-Podgurski, Robert C.N.
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Chou, Derek
Fernandez, Kelly
Syu, Yong-Long
Pilawa-Podgurski, Robert C.N.
description On-board electric vehicle (EV) chargers convert grid ac voltage to dc voltage to charge a high-voltage battery pack. High efficiency and high power density single-phase ac-dc converters are desirable in such applications to reduce the heat loss, volume and weight of these chargers. Moreover, the capability of bidirectional conversion is preferred for potential vehicle-to-grid applications. This paper presents the system ar-chitecture and embedded digital control implementation of a 7 kW, universal ac (120-240 V AC ) to 400 V DC single-phase ac-dc bidirectional converter. The converter features an interleaved 6-level flying capacitor multilevel (FCML) ac-dc stage and a series-stacked buffer for buffering twice-line frequency pulsating power to achieve high efficiency and power density. Test results that demonstrate both ac-dc power factor correction (PFC) and inverter operation at kilowatt levels are provided.
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title Architecture and Control of An Interleaved 6-Level Bidirectional Converter With an Active Energy Buffer for Level-II Electric Vehicle Charging
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