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A novel sub-module circuit is proposed in this paper based on the controllability theory. At first, traditional full bridge sub-modules (FBSM) of the MMC is modeled as a switched linear system, then controllability of the switched linear system model of the sub-module circuit is studied. It is found that the sub-module circuit is state controllable with only four operation modes adopted in the model...
In this paper, a cascaded multilevel inverter is implemented for resistive as well as RL load. Working of Cascaded multilevel inverter is studied for various levels of voltages by implementing proper switching. To verify the operation of the proposed inverter, simulation is completed using MATLAB for various levels of outputs such as nine, eleven, fifteen, twenty seven, thirty three and thirty nine...
Using current conveyors, we present six different current-mode circuits approximating fractional-order low-pass transfer function. Proposed circuits always use four active elements, three capacitors and seven or five resistors, whereas all are grounded. We show that the usage of only eight passive elements is sufficient to approximate a (1 + α)-order system (0 < α < 1) and can even provide better...
The paper proposes a method to use the Fibonacci numbers with odd and even indices for synthesis of switched capacitor converters (SCCs) with multiphase control. As in the previously developed method using high-radix positional numeral systems, the capacitors in the proposed method can be connected in parallel. For this purpose, a special two-dimensional (2D) array of switches is introduced. Thus,...
This paper is concerned with the process of current commutation and overvoltage protection in matrix converters. The mechanisms involved in the commutation process and clamp circuit are described and simulation waveforms are presented. A four-step semi-soft commutation strategy is described that this technique relies on knowledge of the output current direction and the ability to control the direction...
This paper describes the use of genetic algorithms to generate power processing circuits. In order to speed up the algorithm, the fitness of the circuits is evaluated using an explicit integration method based on the 4th order Adams-Bashforth formula. Different combinations of genetic primitives for the crossover and mutation processes have been tested. The algorithm is demonstrated by generating...
The Performance of battery packs is highly affected by imbalances between the series connected cells that provide the required string voltage. A modular battery implementation based on cascaded converters can have advantages over traditional centralized battery systems with add-ons active/passive balancing techniques. This paper investigates the use of a modular battery integrated within a cascaded...
Based on the Cockcroft-Walton (CW) voltage multiplier, a novel receiver topology for IPT (Inductive Power Transfer) system is proposed. The proposed receiver topology enhances the efficiency of the IPT system through achieving that the induced secondary voltage and current are in-phase with the appropriate control method. This paper carried on the modeling of the receiver topology, and deduced the...
Multilevel converters, which are supplied by cascaded capacitors and non-isolated DC sources, can not operate without capacitor voltage balancing. This paper proposes a capacitor voltage balancing technique for the dual three-level T-type advanced converter topology. The reason behind the capacitor voltage unbalance, of this topology, is discussed and clarified by using the converter power circuit...
This paper analyzes the performance of three different topologies namely parallel, serial and variable-structure circuit of switched-diode-capacitor voltage accumulator (SDCVA). The converters are modelled in MATLAB/Simulink environment. Simulation is carried out to investigate the performance of the converters and the results are discussed. The optimum topology is identified based on the voltage...
Basically, the output voltage in renewable energy sources is improved using the boost converter, which is the key part in a photovoltaic chain. In this converter, the switching frequency is limited; hence the output voltage is reduced. To overcome this problem, two topologies are proposed; the quadratic boost converter results by combining the components of two boost converters by using single switch...
Despite being employed in burgeoning efforts to improve power delivery efficiency, integrated voltage regulators (IVRs) have yet to be evaluated in a rigorous, systematic, or quantitative manner. To fulfill this need, we present Ivory, a high-level design space exploration tool capable of providing accurate conversion efficiency, static performance characteristics, and dynamic transient responses...
The “More Electrical Aircraft” concept involves a significant increase of power demand in modern aircrafts. In this context, a new high voltage DC distribution system has been proposed. This makes it necessary to develop a new generation of DC-DC converters to supply the 28VDC loads. These converters must comply with stringent requirements in terms of power density and electromagnetic compatibility...
In many practical applications of wireless power transfer (WPT) system, high power transmission efficiency is required and has been widely studied as an important issue. This paper presents and analyzes a Series-Parallel compensated WPT system with a Z-source inverter network inserted. To obtain higher efficiency, asymmetrical voltage-cancellation (AVC) control is applied and the ZVS operation is...
Several power converter topologies have been presented for Inductive Power Transfer (IPT) systems to generate high frequency current to cite the primary side inductive coils/tracks. This paper proposed the neutral point clamped (NPC) and flying capacitor (FC) multilevel converters based IPT systems which are suitable for high power IPT applications. The modulation strategies for single phase as well...
To improve the efficiency of electric vehicle technology, hybrid energy sources are being incorporated. Another strategy for improvement is to facilitate energy recovery in regeneration mode. So the solution to this to use a bidirectional DC-DC converter in electric vehicles. The improvement of efficiency can be further increased by using a non-isolated bidirectional DC-DC converter. In this paper,...
In electric vehicles (EVs), Li-ion battery has been applied as the main power source. To give enough power and energy to the system, single Li-ion battery cells will be connected in series and parallel to make a battery pack. Thus, cell equalization for battery pack has been an important topic in battery management system (BMS). Recently, researches have proposed different topologies and control strategies...
This paper presents a new topology for waveform-generation using two current conveyors, and a grounded capacitor or a resistor for tuning. It uses current-conveyors in place of voltage op-amps to offer better linearity, bandwidth, slew rate and thermal stability. Measured results obtained using commercially available devices AD844AN and passive components show excellent linearity and tunability for...
DC/AC inverter topologies having reduced numbers of switches to reduce costs, total inverter size and switching losses have previously been proposed. In addition, these topologies reduce the likelihood of semiconductor switch damage, and have lower common-mode currents. This paper proposes new designs for inverters with reduced switch numbers. For three-phase systems, the proposed inverters use four...
This work develops a generalized output impedance model for switched-capacitor (SC) and hybrid-resonant switched-capacitor dc-dc converters that is scalable across conversion ratios and frequencies. This model builds on previous analytical treatments of SC and ReSC converters, but is expanded to derive optimizations that include both conduction and switching loss and help distinguish the regimes in...
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