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Biao Ma,Weichen Lu,He Wang,Liang Yu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12
In order to realize the miniaturization and electrification of heavy vehicles, this paper innovatively puts forward a two-speed transmission device equiped with electrically controlled toothed band brakes. The dynamic models of the planetary gear and toothed band brake are derived, and the shift strategy is established to achieve the optimal dynamic performance. Moreover, the gearshift characteristics under different working parameters are studied to verify its feasibility. The results demonstrate that the toothed band brake has a short braking time and contributes to good shift performance, thus has potential for application. The effect of synchronous speed and actuator speed on shift performance is also analyzed. The increase of both speeds is beneficial to speed up the shift time, but lead to increased shift impact. The application of such a brake offers the possibility of full-electric and lightweight for electric vehicles.
Gao, Ming,Yu, Weichen,Wang, Shanshan,Shi, Jianjiang The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.10
Due to their advantages of reduced cost, integrated multi-port converters (MPCs) with fewer components have received extensive attention. In this article, by extracting the concept of series/parallel input pulsating cells (IPCs) and output pulsating cells (OPCs), a set of syntheses for generating MPCs composed of IPCs and OPCs is proposed. When compared with the existing synthesis method for non-isolated MPCs, the proposed approach employs only one inductor and features single-stage power conversion between any two ports, which offers benefits in terms of compact size and high efficiency. Two design examples are shown to demonstrate the worth of proposed methodology. The operation principles are first analyzed. The pulsewidth modulation (PWM) and power control schemes are explained and designed in detail. To design the controllers, small-signal models for each of the operation modes are also extracted. Meanwhile, the characteristics of pulsating cells with different configurations are discussed and compared. The theoretical analysis is validated by simulation and experimental results for different operation conditions.
Ming Gao,Shanshan Wang,Weichen Yu,Tao Liu,Jianjiang Shi 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.12
A conventional boost three-port converter is combined with a coupled-inductor-based boost-flyback converter in this work to produce a high-step-up three-port converter. The proposed converter inherits the benefits of two conventional converters, including high voltage gain, few elements, and energy recycling of the leakage inductor. In addition, the voltage stresses of switches are considerably lower than the output voltage. Therefore, switches with low ON resistance can be selected to reduce the conduction loss. Additionally, the freewheel diodes are capable of zero-current switching. The operation principle can be divided into three modes of operation, and the three steady-state operation modes are analyzed under each of the three conduction modes. The operation principles of various modes, the voltage characteristics, the boundary of the coupled inductor, and the proposed converter’s control method are discussed in depth to provide detailed theoretical guidance to designers. Then, the simulation and experiment results of a laboratory prototype with an 18 V PV source, 24 V battery pack, and 180 V output are presented to validate the feasibility of the theoretical analysis.