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Energy factor proposed as a goodness factor for DC system is reviewed in this paper. More general definitions of energy storage and energy factor are presented based on the analysis of energy process. By these new definitions, energy factor and energy storage can be extended into AC system. They can be used to compare the performance of different topologies of DC converters. The investigation of transformer's...
In this work, a new performance parameter, namely power factor, introduced is used in the analysis of buck DC-DC converter operating in DCM. The power factor concept is now applied in the analysis of DC circuits. The derivation of the parameter and its application as one of the performance parameters in the analysis of the buck DC-DC converter operating in DCM and boost converter operating in discontinuous...
This paper presents an experimental direct driving system with in-wheel switched reluctance motor (SRM) for electrical vehicle (EV). The integrated EV direct driving system includes three main parts: the SRM model, driving circuit and control unit. The proposed 8/6 SRM is a novel motor with high performance; the specified external rotor type fits the requirement of in-wheel EV for saving space. The...
LED lighting is applied to clothing. It allows a flexible method to provide illumination of lighting. A family of converter topologies is proposed to give this simply method of power conversion. Analysis for the circuits in terms of output power, efficiency and general operation are provided. Two types of LED lighting clothing are developed. One is using super-bright LED embedded on the cloth. This...
In this paper, the storage energy in DC system is used to investigate the nonlinear phenomena of the buckboost converter under the peak current control mode. Bifurcation and chaos are observed based on the stroboscopic map, zero energy is obtained in stable period one and the storage energy with same value and opposite direction are obtained in period two, new phenomenon occurs in some parameters...
In this work, a new performance parameter, namely power factor, is introduced in the analysis of DC-DC converters. The power factor, which is used frequently in AC circuits, is now applied in the analysis of DC circuits. The derivation of the parameter and its application as one of the performance parameters in the analysis of a buck DC-DC converter operating in both the continuous (CCM) and discontinuous...
A new theory of energy concept is analyzed in the paper, namely energy factor, that is to develop the relationship of the energy stored in all passive components and its energy through put in the system. Maximum variation of energy factor (MVEF) is the key factor for the analysis and that the characteristics of MVEF for Cuk, Zeta and Sepic converters are investigated. The boundary condition of the...
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