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Single-Phase Full-Power Operable Three-Phase Buck-Boost Y-Rectifier Concepts
(2021)2021 IEEE Applied Power Electronics Conference and Exposition (APEC)Future electric vehicle chargers should feature full nominal output power in single-phase (1-Phi) and three-phase (3-Phi) operation, such that they can be employed in the USA as well as in Europe. Further, the converter system should have buck-boost capability to cover a wide DC output voltage range in order to provide compatibility with various nominal battery voltage levels. The phase-modular Y-Rectifier consists of three buck-boost ...Conference Paper -
Control and Protection of a Synergetically Controlled Two-Stage Boost-Buck PFC Rectifier System under Irregular Grid Conditions
(2020)2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia)There is an increasing demand for three-phase mains interfaced high power EV chargers that provide a wide output voltage range while featuring low losses and a high power density. In this context, a synergetic control structure for a two-stage three-phase boost PFC rectifier with subsequent DC/DC buck stage was proposed, which allows to only switch one out of the three rectifier bridge legs, leading to switching loss savings of over 66 ...Conference Paper -
Advanced Synergetic Charge Control of Three-Phase PFC Buck-Boost Current DC-Link EV Chargers
(2022)2022 IEEE 23rd Workshop on Control and Modeling for Power Electronics (COMPEL)An advanced synergetic charge-based mains cur-rent control (ASC) for three-phase power factor correction (PFC) buck-boost current DC-link AC/DC converters, which integrate a front-end buck-type current DC-link PFC rectifier and a DC/DC boost converter output stage, is proposed. The charge control is embedded in the synergetic (coordinated) control of the two converter stages, retaining all advantageous features such as only a minimum ...Conference Paper -
3-Φ Bidirectional Buck-Boost Sinusoidal Input Current Three-Level SiC Y-Rectifier
(2021)2021 IEEE Applied Power Electronics Conference and Exposition (APEC)Aiming for ever more compact and efficient Electric Vehicle (EV) battery chargers, in this paper a three-phase phase-modular buck-boost Three-Level Flying Capacitor Y-Rectifier (3L-FC-YR) is introduced. The unique circuit structure of the 3L-FC-YR requires time-varying flying capacitor voltages, making the safe and performant operation of such a converter system challenging. Accordingly, a special clamping modulation strategy is proposed ...Conference Paper -
Synergetic Control of a 3-Φ Buck-Boost Current DC-Link EV Charger Considering Wide Output Range and Irregular Mains Conditions
(2020)2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia)A wide output voltage range EV charger employing a three-phase (3-Φ) buck-type current source rectifier (CSR)-stage and a series-connected boost-type DC/DC-stage is introduced. The system employs a novel control structure, enabling robust operation even under heavily unbalanced 3-Φ mains conditions. It is verified how the proposed concept achieves PFC operation while regulating the output voltage in a wide range, which requires both buck ...Conference Paper -
Three-Phase Bidirectional Buck-Boost Current DC-Link EV Battery Charger Featuring a Wide Output Voltage Range of 200 to 1000V
(2020)2020 IEEE Energy Conversion Congress and Exposition (ECCE)High power EV chargers connected to an AC power distribution bus are employing a three-phase AC/DC Power Factor Correction (PFC) front-end and a series-connected isolated DC/DC converter to efficiently regulate the traction battery voltage and supply the required charging current. In this paper, the component stresses and the design optimization of a novel two-stage three-phase bidirectional buck-boost current DC-link PFC rectifier system, ...Conference Paper -
Three-Phase Bidirectional Ultra-Wide Output Voltage Range Current DC-Link AC/DC Buck-Boost Converter
(2020)IECON 2020: The 46th Annual Conference of the IEEE Industrial Electronics SocietyHigh power EV chargers connected to AC power distribution architectures employ a three-phase (3-Φ) PFC rectifier front-end and a series-connected isolated DC/DC converter to cover a wide range of traction battery voltages and efficiently supply the required charging current. In this paper, the operating principle of a two-stage 3-Φ buck-boost current DC-link PFC rectifier system is first introduced. Its optimal operating modes, minimizing ...Conference Paper