Industrial Electronics
Jasem Shahsevani; Reza Beiranvand
Abstract
This article presents a transformer-less bidirectional converter, which is designed with dual resonant frequencies. It supports Electric Vehicle (EV) charging systems, via capacitive coupling wireless power transfer (CCWPT) technique. In addition, its bidirectional power transfer feature can be used ...
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This article presents a transformer-less bidirectional converter, which is designed with dual resonant frequencies. It supports Electric Vehicle (EV) charging systems, via capacitive coupling wireless power transfer (CCWPT) technique. In addition, its bidirectional power transfer feature can be used to return energy to the stations of the power-wall systems. This converter smoothly operates in both voltage step-up and step-down operation modes, which provides soft switching conditions for all semiconductor switches. Capacitive coupling technique provides robust galvanic isolation between the primary and secondary sides circuits, while the transformer-less design improves its efficiency and reduces its volume and cost, significantly. The proposed converter supports both full-bridge and half-bridge configurations to adapt to diverse power transfer requirements. The cost-effective CCWPT setup enables multi-EV charging from a single station. A prototype of the given converter has been meticulously developed and experimentally validated, demonstrating excellent performance. The converter efficiently converts output power in a wide range from 200 W to 1000 W, accommodates input voltage from 300 to 500 V, delivers a 400 V output voltage, which is suitable for EV battery charging. It also achieves maximum efficiency value of 96%, in practice.
Industrial Electronics
Jasem Shahsevani; Reza Beiranvand
Abstract
Efficient and versatile charging solutions are essential for modern applications requiring portable energy systems. This paper presents a novel portable charger powered by an isolated split-core current clamp, enabling direct charging from power lines. The system utilizes inductive coupling to draw AC ...
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Efficient and versatile charging solutions are essential for modern applications requiring portable energy systems. This paper presents a novel portable charger powered by an isolated split-core current clamp, enabling direct charging from power lines. The system utilizes inductive coupling to draw AC current from these lines, which is then regulated to a precise voltage for battery replenishment. The proposed design features an interleaved resonant topology with a semi-active rectifier, achieving high efficiency and adaptability to a wide range of input voltages. This architecture supports a variable DC bus voltage, enabling the resonant converter to operate optimally near its resonant frequency for maximum performance. To ensure a lightweight and efficient design, the converter eliminates traditional transformers, incorporating a capacitive element within the resonant network for galvanic isolation. A cascaded dual-control strategy in the interleaved structure ensures precise voltage regulation. Designed to be compatible with 1-6 cell Li-Ion batteries, the charger offers extensive versatility. Experimental results from a 2.5-200 W prototype, with an output voltage range of 4.2-25.2 V, demonstrate a peak efficiency of 94%, validating the effectiveness of the proposed charger for grid-connected applications.
Industrial Electronics
Mohsen Feizi; Reza Beiranvand; Mahdi Daneshfar
Abstract
Conventional energy storage systems (ESSs) such as super-capacitors and lithium-ion batteries require voltage equalization systems to eliminate voltage imbalances, and bidirectional dc-dc converters to complete the charging process. These separated systems require some sensors, inductors, switches, and ...
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Conventional energy storage systems (ESSs) such as super-capacitors and lithium-ion batteries require voltage equalization systems to eliminate voltage imbalances, and bidirectional dc-dc converters to complete the charging process. These separated systems require some sensors, inductors, switches, and transformers. Consequently, the ESSs volumes, prices, and their complexity are dramatically increased by increasing the required series connected batteries count. Here, a self-equalized battery charger is proposed for lithium-ion batteries by combining a voltage multiplier (VM) and a phase-shifted full-bridge (PSFB) dc-dc converter. In the proposed self-equalized battery charger, the voltage multiplier eliminates the voltage imbalances and the PSFB dc-dc converter carries out the charging process. By combining the voltage equalizing and the charging systems into a single system, an integrated converter is obtained which leads to simultaneous charging and equalization operations, power and control sections simplicity, as well as low volume and price. By utilizing the phase-shift control method, zero-voltage-switching (ZVS) operation of power MOSFETs is obtained which leads to high efficiency and low EMI noise. The experimental results for 8 battery modules including 48 lithium-ion cells, are in good agreement with the given mathematical analyses and simulations and clearly show the simultaneous charging and voltage equalizing operations, as well.
