Synthesis methodology for multi-pole ZVT converters

Abstract

Transition) technique presents characteristics which interest the Abstract-This paper proposes a novel synthesis methodology industry such as the simplicity of the topologies, the roughness, to generate integrated ZVT topologies, as well to systematize the wide load soft-switching range and it allows the closest operation topologies already known. It is presented an approach to clas-to the PWM counterpart [2], [3], [5]-[18]. This characteristic is sify the single pole ZVT converters. This approach can be ex-quite important, once it permits that most of the knowledge panded to multi-pole systems, such as poly-phase inverters and rectifiers, Uninterruptible Power Supplies and Variable-Speed apcqlied to ZVT converters. Drives. The connections among several topologies presented so aplietoZV onverters. far are easily seen by means of the general diagrams shown in Multi-pole soft-switched systems can be obtained by adding this paper. The analysis and understanding of advantages, individual soft-switching cells (such as the ones from [4], [7], disadvantages, merits and limitations of each converter is made [9], [13], [14], [16], [17], [19]) to each pole of the system.easier since these converters are obtained from a common ap-However, this procedure presents some inconvenient, for exproach presented in this paper.ample, larger volume and cost and the increase in the number of switches and in the amount of isolated drives, likewise. Besides, I.INTRODUCTION it reduces the reliability due to the increase in the amount of The increasing demand on electric facilities such as condi-components. tioning energy equipment (UPSs), together with the stringent To attend the severe market competition and industry cost dynamic performance, efficiency, reliability, and size require-constraints, the researches concerning soft-switching have been ments imposed by the new global market, make the multi-stage driven to integrated topologies [1]-[3], [8], [10], [11], [18], [22], systems one of the focus of the power electronics researches all [24] once that these topologies have less components and this over the world. Multi-stage and Multi-pole systems are com-way, the resulting structure is more compact, cheaper and can be prised by a set of PWM Basic Building Blocks, as shown in Fig. more reliable, making them more attractive. On the other hand, 1(a). they may introduce synchronous switching requirements and To attend the performance and efficiency requirements of more complex modulation techniques. Unfortunately, none of multi-pole systems such as high efficiency, good dynamic re-these works provide an efficient methodology to evaluate or even sponse and high power density, the soft-switching techniques to synthesize integrated ZVT topologies. In order to fulfill this can be an attractive choice [4], [7], [9], [13], [14], [16], [17], blank, this paper proposes a systematic methodology to synthe-[19]. The soft-switching techniques introduce additional com-size multi-pole ZVT converters. ponents to the PWM Basic Building Block aiming to sh...