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Modular multi-level converter (MMC) is one of the promising voltage source converter (VSC) topologies in recent years due to its modularity and scalability. Generally, the main technical challenge of different VSC topologies is the voltage balancing of sub-modules capacitors. Conventional sensor-based balancing techniques require a large number of voltage sensors which increases system cost and complexity...
This paper presents the study of maximum power point tracking with only one current sensor and describes a method to improve the performance of conventional algorithms. Fast tracking, minimum oscillations around MPP, and application for different dc/dc converters are major improvements. Additionally, the method has the advantages of good efficiency, fast dynamic response, and low implementation cost...
The main objective of this paper is to implement a nonlinear control for a PWM voltage source converter with a reduced number of sensors. For this purpose an input-output feedback linearization control strategy is firstly implemented in order to control both the line current and the DC output voltage. Next, an estimator of the AC mains voltage is implemented so as to reduce the number of the requested...
This paper presents a current-mode control non-inverting buck-boost converter. The proposed circuit is controlled by the current mode and operated in three operation modes which are buck, buck-boost, and boost mode. The operation mode is automatically determined by the ratio between the input and output voltages. The proposed circuit is simulated by HSPICE with 0.5 ??m standard CMOS parameters. Its...
In the embedded distribution control system, the analogue quantity under test is usually nonlinear. In order to realize fast and accurate detection of it we present a multipoint calibration, which includes two program editing thoughts: subsection linearization and subsection variable slope.
Current sensing and sharing are important functionalities for paralleled and multiphase power converters. For reliable and efficient operation, current sensing accuracy and the current sharing performance are required. Therefore, sensing errors and mismatches should be eliminated and calibrated. On the other hand, conventional current sharing controllers are designed to force equal current sharing...
As the technology of SoC (system-on-chip) implementation has been improved, power management IC such as DC-DC converters should be also integrated into a single chip. The current-mode control DC-DC converter is preferred to the voltage-mode one because of simpler frequency compensation scheme, which makes it possible to utilize the chip with less off chip components. In order to achieve an efficient...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
A novel integrated CMOS current-sensing circuit suitable for boost dc-dc converters is presented in this paper. The proposed current-sensing circuit can cancel the offset-current in the traditional current-sensing circuit, thus a higher sensing-accuracy is achieved. Moreover the op-amp used as a voltage follower is not used in the proposed current-sensing circuit. Using a standard 0.6 mum CMOS process,...
An integrated CMOS current-sensing circuit suitable for current-sensing of boost converters is presented in this paper. The simulation results verify the validity and the current-sensing accuracy of the proposed circuit. For the purpose of power saving, the supply voltage of the proposed circuit can be reduced by varying the device parameters.
We demonstrate a ldquotrading time for signalrdquo approach for the measurement of species-specific optical transmission, in ambients rich in particulates, using the example case of a turbulent fluidized bed reactor. The method is introduced on the basis of Monte Carlo simulations, as well as analysis of experimental data, of beam propagation for a range of path lengths, and particle concentrations...
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