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GaN-based soft-switched active power buffer operating at ZCS – problems of start-up and shut-down

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This paper describes practical issues related to control of the active power buffer (APB) developed for a 2 kVA single-phase inverter. The buffer is designed using the latest GaN HEMTs controlled with triangular current mode to reduce switching losses, however, the switching frequency should be limited to 1 MHz. In the case of the presented analogue-digital controller, frequency is influenced by a reference current of the APB and circuit. Therefore, the operation at start-up and shut-down is especially challenging. A modified control algorithm that also includes pre-charging and discharging process of the energy buffer is presented and experimentally verified by series of tests of the 2 kVA GaN based inverter with the APB.
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Bibliogr. 18 poz., rys., tab.
  • Warsaw University of Technology Department of Electrical Engineering, pl. Politechniki 1, 00-661 Warsaw, Poland
  • Warsaw University of Technology Institute of Microelectronics and Optoelectronics, ul. Koszykowa 75, 00-662 Warsaw, Poland
  • Warsaw University of Technology Department of Electrical Engineering, pl. Politechniki 1, 00-661 Warsaw, Poland
  • Warsaw University of Technology Institute of Microelectronics and Optoelectronics, ul. Koszykowa 75, 00-662 Warsaw, Poland
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Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).
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