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This paper aims to explore the optimal charging frequency of the LiFePO4 battery by the analysis of the AC impedance. The experiments show that the optimal charging frequency is at the minimum AC impedance frequency fZmin. In such a condition, the LiFePO4 battery charging time and charging efficiency are improved about 5.6% and 6.8%, respectively. In addition, the increased temperature of the battery...
A high efficiency wind power converter, mainly constructed by the proposed duty boundary condition boost converter (DBC-BC) is proposed in this paper. It can work in the high efficiency duty cycle to effectively increase the efficiency of wind power converter. A 3kW prototype is designed and implemented to assess the performance of the proposed DBC-BC. Experimental results show that a wind power converter...
In this paper, a sinusoidal current charger (Sin-CC) with optimal frequency tracker is proposed for Li-ion battery. The proposed optimal frequency tracker is mainly constructed by the phase-lock-loop so that the features of detecting, tracking and locking in the optimal charging frequency can be achieved. The experimental results show that the charging speed charging efficiency and increasing surface...
In this paper, analysis and design for a dual-boost single-phase active power factor corrector with one cycle control (OCC) is presented. The dual boost topology combines rectification and power factor correction (PFC) together. Only one of the two power switches is operated respectively during each positive or negative half line cycles. The controller employs the one-cycle-control strategy, which...
This paper describes an implementation of a 3-phase voltage sourced regenerative rectifier under direct current control strategy. General mathematical model of the converter is first established. Based on the model, the principle of the direct current control strategy is presented, simulation results are given, and circuit operations in steady state are analyzed. Based on SVPWM, the analysis explains...
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