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The following paper describes the design and implementation of an analog-to-digital converter (ADC) using an FPGA circuit — Artix 7, manufactured by Xilinx inc. The ADC implemented is intended to be part of a digital control circuit for a DC-DC inverter. All blocks of the control circuit will be part of the FPGA circuit. The method described requires two successive conversions, namely voltage-to-time...
This paper describes the impact of two different control algorithms on the behavior of a DC-DC step down converter. The compared algorithms are average current mode control and voltage mode control. Both feature advantages and disadvantages, with the former being more difficult to implement but yielding better dynamic parameters and the latter being easier to implement and more cost effective, but...
The paper presents an improved flexible method to control a vaporizer filament using a digitally controlled switch mode power supply. The vaporizer is used in portable plasma equipment for heavy metals detection. The temperature profile needed for the probe vaporization can be set using the proposed digitally controlled converter through a PC interface.
This This paper presents a comparison between two digital control methods for a boost power factor correction (PFC) converter based on the dynamic response at load changes and levels for the harmonic currents injected back on to the network. The power topology used is a bridgeless boost converter due to its high efficiency and low electromagnetic interferences (EMI) levels. The algorithms compared...
Due to the rising fuel costs and growing worldwide demand for electricity, renewable energy sources become a necessity rather than a luxury. This paper presents an original control strategy for a buck-boost based converter used as a low cost inverter in a photovoltaic (PV) system. The main objective of the inverter is to harvest maximum power from the PV module and to inject it into the grid. The...
The development of intelligent microgrids with renewable energy sources increased significantly nowadays. The present paper examines and compares analog and digital control of a bidirectional phase shift converter in order to find out which is best suited to be used in intelligent microgrid applications. New small signal models for the direct and reverse power flow transfer modes of the converter...
Distributed generation systems convert energy from solar panels, wind turbines, fuel cells etc. and supply DC/AC buses with energy of improved quality. The article describes the analysis and design of a mixed topology consisting of a phase shift converter responsible for transferring energy from the DC bus to the storage elements, and an interleaved boost converter responsible for transferring energy...
In order to increase the output efficiency of a PV energy system, it has to be forced to operate near the maximum power point (MPP). A photovoltaic (PV) system, including Maximum Power Point Tracking (MPPT) controller that extracts the maximum possible output power from the solar panel is built. Simulation and experimental results show that the proposed system, making use of several MPPT control algorithms...
A solar system, including maximum power point tracking (MPPT) controller and Texas Instruments' UC3886 boost converter, is built. The MPPT controller implements the Perturb and Observe algorithm, to obtain the maximum possible output power from the photovoltaic (PV) panel and increase the conversion efficiency. The operation of the entire system in low luminosity conditions is tested. The improvement...
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