| 1. |
- Blinov, Andrei, et al.
(författare)
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High Gain DC-AC High-Frequency Link Inverter With Improved Quasi-Resonant Modulation
- 2022
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Ingår i: IEEE Transactions on Industrial Electronics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0278-0046 .- 1557-9948. ; 69:2, s. 1465-1476
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Tidskriftsartikel (refereegranskat)abstract
- This article presents a high gain pure sine- wave inverter based on the full-bridge dc-ac high-frequency link cycloconverter topology for telecom or general-purpose applications. The improved quasi-resonant modulation method allows reduction of ringing and turn-off losses of the dc-side switches. This is achieved with minimal energy circulation and requires no multi-mode operation or extra auxiliary clamping circuits. The soft switching can be provided even if relatively large lossless snubber capacitors are connected across the input side transistors. Moreover, two of the switches at the ac side operate at fundamental frequency, while the rest feature zero current turn-off. A 48 V-DC to 230 V-AC, 1.2 kW sine-wave inverter prototype was developed to verify the proposed concept.
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| 2. |
- Chub, Andrii, et al.
(författare)
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CCM and DCM Analysis of Quasi-Z-Source Derived Push-Pull DC/DC Converter
- 2014
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Ingår i: Informacije midem. - 0352-9045. ; 44:3, s. 224-234
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a steady state analysis of the operation modes of the quasi-Z-source (qZS) derived push-pull DC/DC converter topology. It was derived by the combination of the qZS network and coupled inductors. The output stage of the converter consists of a diode bridge rectifier and an LC-filter. This topology provides a wide regulation range of the input voltage and galvanic isolation. These features fit the requirements for the integration systems of renewable energy sources, such as PV panels, variable speed wind turbines, and fuel cells. A converter can operate in continuous (CCM) and discontinuous conduction mode (DCM). Switching period is divided into four and six intervals for CCM and DCM, respectively. Equivalent circuits and analytical expressions for each interval are presented. The DC gain factor for each mode is derived. To simplify our analysis, coupled inductors were substituted with a model that consists of an ideal transformer and magnetizing inductance. Leakage inductances are neglected because the coupling coefficient in this topology should be close to unity. In DCM the converter operation depends on the active duty cycle and the duty cycle of the zero current condition. Two solutions are possible for the DC gain factor in DCM. It is theoretically impossible to achieve the unity DC gain factor in DCM if the turns ratio of coupled inductors is equal to or more than one. The proposed topology was simulated with PSIM software in two operating points. Experimental verification proves our theoretical and simulation results.
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