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In order to enhance the power density of power factor correction (PFC) converters, an integrated structure for both electromagnetic interference filter and boost inductors is presented with flexible multilayer foil integration technique. The electromagnetic analysis of the proposed structure is given, and the calculations of the circuit parameters are provided. A prototype of 1-kW PFC converter has...
The architecture of the UPS based on PEM Fuel Cell (PEMFC) is investigated. Firstly, the output characteristics of PEMFC are studied. High efficiency power conversion from hydrogen energy to electric power is emphasized. The characteristics match between PEMFC and load is another key issue. Energy & power management for FC-UPS is explored to satisfy both the load dynamics and PEMFC optimal operation...
This paper presents a novel start-up scheme for the modular multilevel converter. Firstly a charging process model is introduced and the process of the proposed start-up scheme is presented. Then the maximum current and current-time formula during the charging process is derived. The mathematical solution of the formulas is used to compare with the results from a three-phase simulation using Matlab/Simulink...
This paper presents novel frequency compensation techniques for low-dropout (LDO) voltage regulator. An enhanced active feedback frequency compensation is employed to improve its frequency response. This LDO can provide high stability for loading current range up to 100 mA without loading capacitors. Moreover, the total compensation capacitors only require 7 pF for this technique. This allows us to...
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