This article explores factors influencing the lifetime of electrolytic capacitors. Calculation of capacitor's life time in dedicated application is also described in the article. Finally comparisons of the computed results between several types of electrolytic capacitors in dedicated application are provided.

The paper deals with a review of multi-elements resonant converter topologies. The superior performance of the proposed resonant converter provides inherent current protection and very low circulating energy. The proposed resonant converters can operate with a short output circuit. The converter can achieve zero current swathing (ZCS) and zero voltage switching (ZVS)conditions for the primary and secondary-side of the device respectively. The converters achieve 91W/in ³ power density and efficiency up to 96% at the full load. The paper includes the basic equations, analysis and simulation of chosen topologies (LCTLC, LCLCL, LCL2C2).

This paper proposes double interleaved boost converters with high voltage gain and with magnetically coupled inductors, while a third coupled winding is used for magnetic flux reset of the core during converter operation. The topology of the proposal is simple, it does not require many additional components compared to standard interleaved topologies, and it improves the transfer characteristics, as well as system efficiency even for high power levels. The investigation of steady-state operation was undertaken. It was discovered that the proposed converter can be designed for a target application where very high voltage gain is required, while adjustment of voltage gain value can be done through duty-cycle variation or by the turns-ratio modification between individual coils. The 1 kW prototype was designed to test the theoretical analysis. The results demonstrate that the proposed converter achieves very high voltage gain (1:8), while for the designed prototype the peak efficiency reaches >96% even when two additional diodes and one winding were implemented within the converter’s main circuit. The dependency of the output voltage stiffness on load change is minimal. Thus, the presented converter might be a proper solution for applications where tight constant DC-bus voltage is required (a DC-DC converter for inverters).

The paper briefly discusses the most important standards and regulations established for high-power wireless power transfer systems and introduces the main issues concerned with the conceptual design process. It analyses the electromagnetic design of the inductive magnetic coupler and proposes key formulas to optimize its electrical parameters for a particular load. The method applies to both the resistive load and the battery charging. It also suggests basic topologies for conceptual design of power electronics and discusses its proper connection to the grid. The proposed design strategy is verified by experimental laboratory measurement including analyses of the leakage magnetic field.