Amir Mahmood Soomro

Control Strategy for Input-Parallel Output-Parallel DC/DC Converters with Output Current Sharing

This paper presents a digital control strategy for Input-Parallel Output-Parallel (IPOP) DC/DC converters system. The IPOP system is based on two phase-shifted full-bridge (PS-FB) converters whose output current is not equally shared due to parameter differences of each module. The control objective is to obtain output current equally sharing. Small signal model is built to analyze the system stability. Effectiveness of the control strategy is verified by simulation and experiment results.

Improving Router Efficiency in Network on Chip Triplet-Based Hierarchical Interconnection Network with Shared Buffer Design

In Network on Chip effectiveness of router is dependent on the buffer locality, which makes the efficient flow control. Previous buffer design of Triplet-Based Hierarchical interconnection network (TBHIN) is standard, which leads to insufficient accessibility of this decisive resource, where each virtual channel owns a fixed number of buffers. In this article the design is implemented with sharing the buffers among the virtual channels, to improve the performance. The cyclic queue is allowed the simultaneous access to the shared buffer, which is one of the characteristics of TBHIN. A cycle-accurate simulator is used to obtain packet latency and throughput results for conventional and shared buffer designs. Simulation results illustrate that the packet latency is reduces up to 29% by shared buffer design in comparison to conventional buffer design. Also shared buffer design improves throughput up to 11.87% over the conventional buffer design.

Simulation for the Control Strategy of Three-Phase Boost-Half-Bridge (BHB) DC-DC Converter with Series Voltage Doubler Rectifiers through Three-Phase High Frequency Transformer

This paper presents simulation for the control strategy of three-phase boost-half-bridge (BHB) DC-DC converter with series voltage doubler rectifiers through three-phase high frequency transformer. The control strategy is consisting of three voltage loops. All the three voltage loops are independent of the input side and controls the input and output power balance from the secondary side of the high frequency transformers only. Moreover, the control strategy has been verified for its appropriate operation by simulating the above said configuration for the same turn ratios as well as for the mismatch turn ratios of high frequency transformers. Finally, the satisfactory simulation results for the proposed control strategy are presented.

Voltage Waveform Control of Three-Phase PWM Inverter Based on the Output Harmonic Current Feed-Forward Compensation

A control scheme based on the load harmonic current feed-forward compensation for three-phase pulse width modulated (PWM) voltage source inverter is presented. This control scheme is designed to improve the quality of the three-phase inverter output voltage under nonlinear load. The model of the control system in the d-q coordinate system is established based on the traditional double loop control where the feed-forward current is taken from a band pass filter. In order to analyze this compensation method, the system is divided in to two subsystems and each subsystem is analyzed, and the structure of the output harmonic current feed-forward compensation channel is given. Simulation and experimental result validate that the proposed feed-forward compensation method has a good steady state performance and dynamic responses.