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Single-stage LLC charger with PFC functionality and wide input voltage range

  • We present a compact battery charger topology for weight and cost sensitive applications with an average output current of 9A targeted for 36V batteries commonly found in electric bicycles. Instead of using a conventional boost converter with large DC-link capacitors, we accomplish PFC-functionality by shaping the charging current into a sin²-shape. In addition, a novel control scheme without input-current sensing is introduced. A-priori knowledge is used to implement a feed-forward control in combination with a closed-loop output current control to maintain the target current. The use of a full-bridge/half bridge LLC converter enables operation in a wide input-voltage range. A fully featured prototype has been built with a peak output power of 1050W. An average output power of 400W was measured, resulting in a power density of 1.8 kW/dm³. At 9A charging current, a power factor of 0.96 was measured and the efficiency exceeds 93% on average with passive rectification. The impact of pulse charging has been evaluated on a 400Wh battery which was charged with the proposed converter as well as CC-CV-charging for reference. Both charging schemes show similar battery surface temperatures.

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Author of HS ReutlingenWattenberg, Martin; Schwalbe, Ulf; Pfost, Martin
Erschienen in:2019 IEEE Applied Power Electronics Conference and Exposition (APEC) , Mar 17, 2019 - Mar 21, 2019 Anaheim, CA
Place of publication:Piscataway, NJ
Document Type:Conference Proceeding
Year of Publication:2019
Page Number:7
First Page:750
Last Page:756
DDC classes:620 Ingenieurwissenschaften und zugeordnete Tätigkeitenn
Open Access?:Nein
Licence (German):License Logo  Lizenzbedingungen IEEE