Abstract
An improved high step-down DC-DC converter for charging the batteries in an electric vehicle application is proposed in this paper. It adopts the topology of the conventional full-bridge converter, which has a coupled inductor current-doubler rectifier as the secondary side of the transformer. In addition, four power switches are driven using a phase-shifting technique. The proposed converter can achieve a high step-down voltage with low-voltage stress on the rectifier diodes. In addition, the coupled inductor current-doubler rectifier of the secondary side can reduce the ripple current and losses of the secondary side to achieve high efficiency. Furthermore, the proposed converter can overcome the drawbacks of the conventional full-bridge converter, such as switching loss caused by high switching frequency, duty-cycle loss, voltage stress, and numerous components, and can increase the efficiency with the soft-switching technique. A 600 W laboratory prototype of the proposed converter was manufactured. The results of the experiments performed with the prototype proved the effectiveness and validated the use of the proposed converter for better charging of electric vehicles.
Highlights
While the first and second industrial revolutions resulted in the improvement of mechanical and electrical technologies, the third industrial revolution has brought about the use of various electronic devices in people’s everyday lives.Various types of electronic devices have been developed over the years, based on improvements such as miniaturization and high efficiency, and the operating voltage of devices has been gradually decreasing; notably, the operating voltage of microprocessors has decreased from 5 V to 3.3 V
A phase-shift full-bridge (PSFB) converter is a commonly used topology for low output voltage, high output current, and high efficiency, and it has been widely researched for medium- or high-power applications requiring isolation [17,18,19]
Its topology is based on the conventional phase-shift full-bridge converter
Summary
While the first and second industrial revolutions resulted in the improvement of mechanical and electrical technologies, the third industrial revolution has brought about the use of various electronic devices in people’s everyday lives. A phase-shift full-bridge (PSFB) converter is a commonly used topology for low output voltage, high output current, and high efficiency, and it has been widely researched for medium- or high-power applications requiring isolation [17,18,19]. Energies 2021, 14, 4206 width modulation (PWM), and without auxiliary components or complex control circuit It has limitations such as a high step-down voltage conversion, which necessitates a low duty ratio of the power switch or high turns ratio of the transformer. The proposed rectification method is the same as in the conventional CDR method, but the turns ratio of the coupled inductor can be adjusted to expand the range of the duty ratio, thereby reducing the current stress of the transformer and power switch and the output current ripple.
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