The e-MERLIN Data Reduction Pipeline

Written in Python and utilising ParselTongue to interface with the Astronomical Image Processing System (AIPS), the e-MERLIN data reduction pipeline is intended to automate the procedures required in processing and calibrating radio astronomy data from the e-MERLIN correlator. Driven by a plain text file of input parameters, the pipeline is modular and can be run in stages by the user, depending on requirements. The software includes options to load raw data, average in time and/or frequency, flag known sources of interference, flag more comprehensively with SERPent, carry out some or all of the calibration procedures including self-calibration), and image in either normal or wide-field mode. It also optionally produces a number of useful diagnostic plots at various stages so that the quality of the data can be assessed. The software is available for download from the e-MERLIN website or via Github.Comment: 6 pages, 1 figure. Code DOI: 10.5281/zenodo.10163 [ascl:1407.017

A CONTACTLESS POWER STATION FOR CELLULAR BATTERY CHARGER

A Contactless Power Station (CLPS) is a new breakthrough to transmit power without wires in electronic devices such as cellular phones. Power transfer capability of a CPLS system can be increased if the system is designed to operate under resonance condition. The power transfer is then controlled by controlling the inverter frequency. In order to ensure that the power transfer is maximum, a maximum power point tracker is employed to control the CLPS. Several simulated and experimental results are included

Design and Analysis of Three-Phase Three-Level PWM Inverter

Design of three-phase three level PWM inverter and analysis of the output current harmonics are presented in this paper. The three-level inverter is designed to supply three-phase load and it is controlled by FPGA under several modulation techniques (Sinusoidal PWM and Third Harmonic Injection PWM). Selection of semiconductor switches and other component of the inverter are described. Inverter output current harmonics under several modulation techniques will be analysed and compared

Analysis of Output Current Ripple of Three-phase PWM Inverter under Discontinuous Modulation Techniques

In this paper, an analysis of output current ripple of three-phase PWM inverters with discontinuous modulation is presented. The analytical expressions for discontinuous modulation injection signal are derived. It is followed by derivation of rms value of output current ripple of three-phase PWM inverter as a function of modulation index. Analysis of the influence of injection signal phase shift of the rms output current ripple three-phase PWM inverter is given. It is shown that at the same switching frequency with sinusoidal PWM, the discontinuous PWM produces lower rms output current ripple at high modulation index. A 30° lag phase shift results in lower rms output current ripple. Phase shifting from symmetrical discontinuous PWM gives lower modulation index. Simulation results are included to verify the derived expressions

Handling Package Bees

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