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In this paper, a four-port DC-DC converter(FPC) is proposed for electric vehicle application integrated with renewable sources and energy storage system. The four port of the converter is two input, one bidirectional port, and one output. The charging, discharging states and the disturbance at the input side are controlled. The detailed analysis and simulation of the four-port DC-DC converter are...
A novel PWM/PFM hybrid-mode auto-change technique for buck DC-DC converter is proposed. The proposed technique utilizes the comparator propagation delay to decide the mode changing point without adding complicated PMW/PFM hybrid-mode controller. The proposed concept enables compact and simple implementation of hybrid-mode buck DC-DC converter. Simulation results show that the buck DC-DC converter...
In this paper, a step-up dc-dc converter for mobile device applications is proposed. The converter is operated with 1 MHz high switching frequency. The power stage of converter includes an inductor, an output capacitor, MOS transistors and feedback resistors for control loop. The control stage consists of an error amplifier, comparator, a ramp generator for PWM block, bandgap reference and soft start...
This paper proposes a new approach flux-weakening control strategy of the separately excited DC machine. The proposed method is based on the closed-loop speed control in which the field current is independently controlled to adjust the flux-linkage in the flux-weakening operation. In order to achieve the maximum torque in the constant-torque region, the maximum field current is employed, while it...
As in most of the renewable energy sources it is not possible to generate high voltage directly, the study of high gain dc-dc converters is an emerging area of research. This paper presents a high step-up dc-dc converter based on current-fed Cockcroft-Walton multiplier. This converter not only steps up the voltage gain but also eliminates the use of high frequency transformer which adds to cost and...
A novel buck-boost dc-dc converter with high voltage step-up and step-down ability has been introduced in this paper. There are two switches in this converter, of which the sources are connected together and also connected to the ground of the input voltage source. Hence, there is no need for floating gate driver. In addition, the voltage stress of one of the switches is lower than the existing quadratic...
In this paper, voltage and power flow controlled parallel DC-DC boost converter is presented. Generally, a parallel converter system consists of a number of converters operating in parallel. The converters may be of DC-to-DC and DC-AC type depending on the nature (i.e. DC and/or AC) of the system. In this paper, the system considered is of DC type and the converters considered are two boost converters,...
DC-DC converters have been receiving great attention for their extensive use in a myriad of applications starting with basic calculators to photovoltaic systems to sophisticated weaponry. Several control methods were developed for DCDC converters control mostly with asymptotic convergence. Synergetic control are a proven robust controllers approach and will be used here in a so called terminal scheme...
This work develops a systematic state-space approach to modeling of an improved buck-boost DC-DC converters. The averaged model of the converters is analyzed. Based on this model, a control law is design to keep the output voltage stable when the input is unstable. The simulation results are presented to confirm the capability of the converter to keep the output voltage stable. The proposed converter...
Models of Synchronous Generators with PWM DC-DC converter and Self-Excitation Systems have been designed. Calculations have shown that the unipolar PWM DC-DC converter in some modes shortly excludes from the voltage regulation process. The bipolar PWM converter effectively affects the generator and consequently enhances the system operation speed. The bipolar PWM converter uses the energy recovery...
In order to increase the conversion efficiency in photovoltaic (PV) systems, different configurations and topologies were developed. Depending on the application, the converters used for grid connection are built using one or two conversion stages. The advantages of the converters with a DC-stage are mainly the distributed maximum power point tracking algorithm per PV string, a wider range of operation,...
The paper is dedicated to problem of current sharing of paralleled DC-DC converters in order to provide balanced loading of DC-DC converters with common DC bus. Cascaded control system structure is considered where, at first, an inner multivariable current proportional controller is designed and then, at second, an outer voltage integral controller is constructed in order to keep the desired output...
A DC power distribution interface for data centers is developed in this paper. This DC power distribution interface is composed of two power stages, a three-phase T-type multi-level AC-DC power converter and an isolated multi-level DC-DC power converter. The first power stage, three-phase T-type multi-level AC-DC power converter, is used to convert the utility AC voltage to a constant DC voltage and...
This paper presents a new single inductor Dual Input-Dual Output dc-dc converter for a standalone hybrid energy system. The converter has two unidirectional ports, one bidirectional port for storage element and one output port. The converter operates in dual input-dual output mode, dual input-single output mode and single input-single output mode. Both the input sources can power up the load individually...
This paper proposes a real time symmetrical coordinate transformation applied for detection of imbalanced fault in utility power system. The power conditioner of the photovoltaic system in Japan is required to remain connected when the utility power system fault occurs under certain condition. The most popular fault is 1 line-to-ground fault. The next is 2 line-short fault. Both cause the imbalance...
In this paper a fuzzy logic controller for Solar powered DC -DC boost converter is planned. Here for simplification, the PV system is taken as a constant DC Voltage source. The output response of the boost converter, is controlled by changing its duty cycle and the controller is planned to change the duty cycle. The simulation is formulated by MATLAB simulation program and PSIM software. Using fuzzy...
This work presents the analysis of the behavior of a modular system of DC/DC converters with input-series output-series connections. The goal is to explore a simple solution that provides a stable operation by connecting totally independent converters working in DCM, except one of them (working in CCM) that determines the input-output voltage ratio. This alternative can be applicable when the input...
Generally, a photovoltaic (PV) system generates a wide range of voltages and currents at the terminal output. Normally, the PV cell cannot functionally maintain a constant direct current (DC) voltage while incident illumination and ambient temperature. To overcome that problem, a power electronics convertor such as DC/DC converter with the control scheme topology may be used. However, a linear conventional...
Plug-in hybrid electric vehicles (PHEVs) are equipped with a high energy density battery pack, which should be externally charged form the grid. This requires a high power battery charger circuit which can operate at universal input voltage and be capable of maintaining the required output voltage and current with low ripple. The topology composed of PWM boost rectifier cascaded with a bidirectional...
DC/DC converters have been tremendously utilized nowadays. In some special applications such as military, aerospace, and precision instrumentation, the output voltage ripple of DC/DC converters has to be maintained in an acceptable level to achieve superior performance. For example, DC/DC converters are tied with inverter for adjustable speed motor controls or renewable energy interface with utility...
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