Improving step‐up gain and efficiency in non‐inverting buck‐boost dc‐dc converter using quasi‐Z impedance network
Abstract In conventional non‐inverting buck‐boost converters (BBC), step‐up conversion requires high duty cycles, unlike the step‐down conversion. This problem decreases the BBC efficiency in the step‐up mode. Here, an improved non‐inverting BBC is proposed, designed based on a quasi‐Z impedance net...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-02-01
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| Series: | IET Power Electronics |
| Online Access: | https://doi.org/10.1049/pel2.12215 |
| Summary: | Abstract In conventional non‐inverting buck‐boost converters (BBC), step‐up conversion requires high duty cycles, unlike the step‐down conversion. This problem decreases the BBC efficiency in the step‐up mode. Here, an improved non‐inverting BBC is proposed, designed based on a quasi‐Z impedance network. In this topology, the step‐up conversion is done with a higher boost factor and lower duty cycles. By reducing the step‐up duty cycle, the efficiency has been increased. In this BBC, the voltage‐stress on power semiconductors is the same as the conventional type; however, the efficiency improves as power switches operate with lower duty cycles. This article presents the operating principle of the proposed topology in detail. This new topology is compared with previous topologies regarding efficiency, components, voltage, and current stresses on semiconductors, boost‐factor, and implementation cost. Sensitivity analysis results are shown to obtain the effect of the parasitic elements on the converter operation. Simulation and experimental results are also presented to evaluate the topology and its operation. Results confirm the proposed topology. This converter can be used in photovoltaic (PV) based systems like PV‐based electric vehicle (EV) charging systems. |
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| ISSN: | 1755-4535 1755-4543 |