Improved Rogowski Converter for Electric Vehicle Charger
Aviation College, AnYang University, Anyang 455000, China
| Abstract: | With the development of electric vehicles, higher energy and battery efficiency have become the main concerns of electric vehicle manufacturers and consumers. The main component of vehicle charger is DC/DC converter. In the DC/DC converter with power switch, because of the phase shift of the full bridge, the switch has to work at zero voltage or zero current, which leads to some current problems. If the voltage on both sides of the transformer changes, it means that there will be some defects in its performance. The power factor correction converter, which is commonly used in modern electric car charger, has the advantages of high performance and sufficiency in the whole charging process. Therefore, this paper designs an improved Rogowski converter to improve the charging efficiency of electric vehicles. Roche converter is usually used as a converter from DC to DC, which has better voltage regulation ability under rapidly changing line voltage. At the same time, in this work, a reformed independent electric vehicle charger based on Roche converter is developed. In order to suppress voltage oscillation, two devices, namely a switch and two clipping diodes, are connected to the primary side of the high-frequency transformer. Roche converter handles the operation of discontinuous conduction mode, which reduces the complexity of control and keeps the output of converter constant. In the feedback system, constant current and constant voltage mode technology are combined with PI controller to improve the capability and reduce transmission leakage. Finally, the performance of the proposed system is evaluated by MATLAB, and the results are satisfactory. |
| Keywords: | Keywords Electric Vehicle; Charging; Power Factor Correction; Discontinuous Conduction Mode; High Frequency Transformer |
| DOI: | 10.57237/j.se.2022.01.001 |
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Received: 7 September 2022
Accepted: 29 September 2022
Published Online: 1 November 2022
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