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One of the major drawbacks of high-ratio step-up transformers is the high value of their secondary side capacitor. This value is reflected at the primary side giving rise to a non-desirable one. There are some converters which include this capacitor in the topology and can cope with it, and even more, they need it. Particularly, in high-voltage applications, we will find transformers with a large...
This paper presents a combination of a quasiresonant dc-link (QRDCL) inverter and a generalized three-level inverter. QRDCL inverter can decrease the dc-link voltage to zero in order to provide a zero voltage condition for the power devices. The voltage stresses of the power devices can be released and the switching losses of the inverter can be reduced under zero-voltage switching (ZVS). Generalized...
Control strategies of a parallel quasi resonant dc link voltage inverter (PQRDCLI) for electrical drive applications are considered. The main objectives of the proposed strategies are feasibility and robust operation of the PQRDCLI vis-a-vis output voltage dU/dt limitation and stable duration of zero voltage intervals. The first strategy is based on controlling equal charge and discharge of the input...
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