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

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 limi...

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Bibliographic Details
Published inBulletin of the Polish Academy of Sciences. Technical sciences Vol. 68; no. 4; pp. 785 - 792
Main Authors Rąbkowski, J, Król, K, Zdanowski, M, Sochacki, M
Format Journal Article
LanguageEnglish
Published Warsaw Polish Academy of Sciences 01.08.2020
Subjects
active buffer
Active control
Algorithms
Buffers
Circuits
Control algorithms
Control theory
gan
Inverters
power inverter
Shutdowns
Switching
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Summary: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.
ISSN:0239-7528
2300-1917
DOI:10.24425/bpasts.2020.134175