Now showing items 1-10 of 52
A new design methodology for multipulse rectifiers with Delta auto-connected transformers and a retrofit application in Adjustable Speed Drives (ASDs)
Multipulse rectifiers can replace a conventional six pulse three-phase rectifier (diode bridge) providing a DC voltage with low ripple, low Total Harmonic Distortion of current (THDi) and a high Power Factor (PF). In this ...
A DC-DC converter based on the three-state switching cell for high current and voltage step-down applications
This paper presents a pulsewidth modulation dc-dc nonisolated buck converter using the three-state switching cell, constituted by two active switches, two diodes, and two coupled inductors. Only part of the load power is ...
Variable speed refrigeration system with HPF input rectifier stage
This paper is based on the analysis and implementation of a new drive system applied to refrigeration systems, complying with the restrictions imposed by the IEC standards (Harmonic/Flicker/EMI-Electromagnetic Interference ...
A novel HPF voltage source rectifier for variable speed refrigeration systems
A novel single-phase voltage source rectifier capable to achieve High-Power-Factor (HPF) for variable speed refrigeration system application, is proposed in this paper. The proposed system is composed by a single-phase ...
A 2kW interleaved ZCS-FM boost rectifier digitally controlled by FPGA device
This paper presents a 2kW single-phase high power factor boost rectifier with four cells in interleave connection, operating in critical conduction mode, and employing a soft-switching technique, controlled by Field ...
Contribuição ao projeto de circuitos integrados de reguladores de tensão com charge pump em tecnologia CMOS : aceleração do tempo de partida, redução do ripple, redução do efeito kick-back e técnica indireta de medida da tensão de saídaContribution to the integrated circuit design related to voltage regulator with charge pump circuit embedded in CMOS technology : fast startup improvement, ripple and kick-back effect reduction and new techinique of indirect output voltage measurement
A multi-cell variable frequency interleaved ZCS boost rectifier digitally controlled by FPGA
This paper presents a multi-cell single-phase high power factor boost rectifier in interleave connection, operating in critical conduction mode, employing a soft-switching technique, and controlled by Field Programmable ...