Direct Power Transfer Concept in Power Electronics Converters
Date
2022-01-28
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Abstract
In this thesis, a family of power electronics converters is presented with a direct path for transferring the power from the input to the output. In this family, a technique for transferring the power is used which is called direct power transfer (DPT). In this technique, a portion of the power is transferred to the output directly, hence reducing the amount of power that needs to be processed by the semiconductors, and other passive components of the converter. Thus, the conduction losses are reduced, and the overall efficiency is improved. A coupled inductor is used on the input of the proposed converters that creates the direct power path, resulting in a reduction of the power passage in the active and passive components. Additionally, the coupled inductor current has a quasi-rectangular waveform, resulting in reduced peak and, root-mean-square values. Therefore, higher efficiency is gained and the voltage and current rating of the semiconductors are reduced. The DPT technique is applied in DC/DC and AC/DC converters. For DC/DC, the proposed DPT converter is isolated and can provide high performance for a wide range of operating conditions. The semiconductors on the primary side of the transformer operate with zero voltage switching (ZVS), and the semiconductors on the secondary side of the transformer operate with zero current switching (ZCS). Thus, both the switching and conduction losses are reduced. For AC/DC, an isolated bridgeless single-stage DPT converter with a high power factor is proposed. This converter has DPT capability and soft-switching performance over a wide range of operating conditions. In the proposed circuit topology, a bridgeless boost power factor corrector (PFC) is integrated with an isolated current-driven half-bridge DC/DC converter to achieve a bridgeless single-stage PFC structure. Additionally, a direct path is provided using a coupled inductor to directly transfer power from the input source to the output. The bridgeless structure and DPT capability result in reduced conduction losses, while the soft-switching operation almost eliminates the switching losses. Therefore, the proposed converter benefits from low losses and high efficiency. Mathematical analysis, extensive simulation, and experimental results are provided to verify the feasibility of the proposed circuits and demonstrate their superior performance.
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Keywords
AC/DC Converter, Bridgeless boost power factor corrector (PFC), Direct power transfer (DPT) capability, Light emitting diode (LED) driver, Soft-switching characteristics, Coupled inductors, DC/DC converters, Zero-current-switching (ZCS), Zero-voltage-switching (ZVS)
Citation
Tigray, Ethiopia, Z. (2022). Direct Power Transfer Concept in Power Electronics Converters (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.