Dc-Dc Converters Research Papers - Academia.edu (original) (raw)

- by
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- Control Systems Engineering, Renewable Energy, Control Systems, Dc-Dc Converters

This paper describes veriﬁcation and validation activities for electromagnetic transient simulation models of DC/DC converters. These activities include small signal characterization of relevant impedance and frequency response characteristics, as well as large signal characterization of response to overload and over/under-voltage conditions. The activities are illustrated through application to a dual active bridge
DC/DC converter model, and streamlining the application of the activities through the use of a test harness is also discussed.

This paper focuses on the design and control of a stationary energy storage system based on multiple modular high voltage battery modules. The system achieves bi-directional power flow directly from 400V dc grid to the 12V battery modules via a bi-directional dc-dc converter with high conversion ratio as an interface. One merit of such a system is its extensibility and scalability for higher power rating for future use by dispatching more battery modules together. A 2kWh energy storage system prototype which is made up by one grid-connected solid state transformer (SST) emulator and two bi-directional dc-dc converters are designed, fabricated and tested. Based on the modified droop control, a double-loop digital control system for the SST emulator and a single-loop digital control system for the dc-dc converter are implemented respectively. At last, experimental results are presented to verify the proposed distributed control strategy.

- by Fei Xue
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- Renewable Energy, Energy Storage (in Engineering), Microgrid, Dc-Dc Converters
- by Saad Ul Hasan
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- Power Electronics, Renewable Energy, Power Electronics Converter, Dc-Dc Converters

In order to fulfill the increasing demands of energy requirements using the eco-friendly methods of energy generation instead of conventional hazardous methods that have caused severe damages globally. Hybrid renewable energy sources (HRES) are utilized for energy generation for developing smart cities and to make the power systems efficient. HRES systems are designed considering the advance requirements of energy consumption. As the technology is evolving, scientists have developed power saving appliances that operates on low level DC voltage. Since different appliances have different DC voltage ratings, to operate them efficiently multi-level DC voltages are often required. Conventional power systems offer single input and single output (SISO) configuration that cannot fulfill the power requirements of domestic and commercially utilized appliances. However, multi-input multi-output (MIMO) configuration is suitable to fulfil the multi-level voltage requirements. DC-DC converters are responsible to deliver the stable output power in HRES systems. This paper presents implementation of MIMO network using buck-boost converters. The proposed system is simulated in MATLAB Simulink with all possible scenarios. To control the operation of a buck-boost converter, individual control technique is integrated to sustain the desired output value during intermittent conditions. For that purpose, proportional integral (PI) is utilized as a control technique, that regulates the operation of a buck-boost converter with different input and output settings. Keywords-DC-DC converters, buck-boost converter, hybrid renewable energy sources, single-input single output, multi-input multi output, proportional integral.

- by Sheikh T A N Z I M Meraj and +1
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- Hybrid Systems, Renewable Energies, Power Electronics Converter, Dc-Dc Converters

This paper presents the design and implementation of a multiplier Single-Ended Primary-Inductor Converter (SEPIC) for a Power-Hardware-in-the-Loop (Power HIL) emulator of a PV system. The emulation system has been developed in a dSPACE 1104, allowing to exchange the data from a voltage variable power supply and the SEPIC converter in order to extract the maximum power from a solar panel. This methodology is intended for the evaluation of supervision strategies using a Power Hardware-in-the-Loop approach. The proposed project would offer laboratory studies closer to the collection of raw data in a fieldwork, thus facilitating the development of new technologies by obtaining faster and more comfortable results.

- by Johan RM
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- Dc-Dc Converters, Power Electronics Sepic Converter
- by Сергей Абрамов
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- Dc-Dc Converters

Power electronic converters play a vital role in a
power system and the most commonly used type of DC/DC
converters is buck converter. This is due to the fact that buck
converters are widely used to step down the voltage as well as
they provide good voltage regulation in critical applications
including power supplies for data centers. Therefore, designing a
buck converter that gives a regulated output, acceptable for
switch mode power supplies is still challenging task. A closed loop
buck converter mitigates the problems such as input voltage unstability
or variation.

- by Usman Nasir and +1
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- Power Electronics, Dc-Dc Converters

Transient response of three level buck converter depends on the slew rate of filter inductance. The slew rate of filter inductor can be increased either by decreasing the inductance magnitude or by increasing the voltage across the inductor. Decreasing the inductance magnitude results in higher losses in the converter due to increase of inductor current ripples. In a three level buck converter, the voltage across the inductor during step up load transient is 0.5Vin-Vout, while during step down load transient is –Vout. For smaller duty cycle applications, three level buck converter offers slow step up and step down load transient response because of limited magnitude of voltage across the inductor. In this paper a new three level buck converter topology is proposed, which will increase the magnitude of voltage across the inductor during load transients and thus will improve the transient response. After load transient, the converter will recover to normal steady state condition and will behave just like a three level converter in steady state. Theoretical and simulation results are presented to show the effectiveness of
proposed topology in terms of settling time for step up and step down load transient response. Keywords-Slew rate, 3-level converter, switching stresses, Settling time, Voltage overshoot and undershoot

The demand of solar energy has increased rapidly in this decade. This is due to the advantages of the energy compared to other form of sources. The solar energy conversion system is very interesting alternative on supplement the electric system generation, due to the persistent cost reduction of the overall system and cleaner power generation. To obtain a stable voltage from an input supply (PV cells) that is higher and lower than the output, a high efficiency and minimum ripple DC-DC converter required in the system for residential power. Buck-boost converters make it possible to efficiently convert a DC voltage to either a lower or higher voltage. Buck-boost converters are especially useful for PV maximum power tracking purposes, where the objective is to draw maximum possible power from solar panels at all times, regardless of the load.

- by GRD JOURNALS
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- Renewable Energy, Microcontrollers, Dc-Dc Converters, MPPT

Increasing concerns on environmental pollution, global warming, depletion of the fossil fuel reserves and desire for reducing energy dependencies have led to an ever-increasing interest in electric vehicles (EV). The requirements for electric vehicles has brought many different problems and solutions in electric vehicle technology. One of these is the conversion of the voltage level from the battery in electric vehicles to other required voltage levels with DC-DC converters. As a solution, a separate converter can be used for each voltage level. Nevertheless, single-input multi-output (SIMO) converters can be used to reduce the cost and switching losses and hence improve system efficiency. In our study, we proposed non-isolated buck converter topology with single-input (48 V) and multi-output (12 V and 5 V). The 12 V voltage level is used for the horn, headlights while 5 V voltage level is used for the telemetry and microcontroller in electric vehicles. In this work, the general structure of a SIMO converter, design principles, small signal and stability analysis, and control steps are explained. The overall system has been simulated with Matlab / Simulink.

- by Mustafa E R G I N Şahin
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- Dc-Dc Converters, Electrical Vehicles

This paper proposes a new design and implementation of an isolated bidirectional dc-dc converter to interface between a high voltage DC bus (HVDC) and a low voltage DC battery (LVDC). It features zero voltage switching regardless of the direction of the power flow, resulting in lower switching losses and an efficient converter. The details operation principles, as well as the design considerations, are presented. The simulation and experimental results have validated the characteristics of the converter. A prototype, which interfaces a 400V dc bus and 48V battery bank with a power rating of 2.5kW, was developed to verify the validity and applicability of this proposed converter.

- by Masuma Nasrin
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- Power Electronics, Power System, Control Systems, Dc-Dc Converters

INTRODUCTION
A chopper is a static device which is used to obtain a variable dc voltage from a
constant dc voltage source. A chopper is also known as dc-to-dc converter. The thyristor converter offers greater efficiency, faster response, lower maintenance, smaller size and smooth control. Choppers are widely used in trolley cars, battery operated vehicles, traction motor control, control of large number of dc motors, etc….. They are also used in regenerative braking of dc motors to return energy back to supply and also as dc voltage regulators.
Choppers are of two types
• Step-down choppers
• Step-up choppers.
In step-down choppers, the output voltage will be less than the input voltage
whereas in step-up choppers output voltage will be more than the input voltage.
Classification of Choppers:
(a) Depending upon the direction of the output current and voltage, the converters can be classified into five classes namely Class A [One-quadrant Operation] Class B [One-quadrant Operation] Class C [Two-quadrant Operation] Class D [Two-quadrant Operation] Class E [Four-quadrant Operation]
(b) Based on the output voltage of the output, the choppers are classified as
(i) Step-Down Chopper In this case the average output voltage is less than the input voltage. It is also known as step down converter
(ii) Step-Up Chopper Here the average output voltage is more than the input voltage. It is also known as step up converter
(iii) Step-Up/Down Chopper This type of converter produces an output voltage that is either lower or higher than the input voltage
(c) Depending upon the power loss occurred during turn ON/OFF of the switching device, the choppers are classified into two categories namely
(i) Hard switched Converter Here the power loss is high during the switching (ON to OFF and OFF to ON) as a result of the non zero voltage and current on the power switches.
(ii) Soft switched or resonant converters In this type of choppers, the power loss is low at the time of switching as a result of zero voltage and/or zero current on the switches.
2
PRINCIPLE OF STEP-DOWN CHOPPER
Figure 2.1 shows a step-down chopper with resistive load. The thyristor in the
circuit acts as a switch. When thyristor is ON, supply voltage appears across the load and
when thyristor is OFF, the voltage across the load will be zero. The output voltage and
current waveforms are as shown in figure 2.2.
3
The output voltage can be varied by varying the duty cycle.
METHODS OF CONTROL:
pulse width modulation
In pulse width modulation the pulse width of the output waveform is varied
keeping chopping frequency ‘f’ and hence chopping period ‘T’ constant. Therefore output voltage is varied by varying the ON time, Figure 2.3 shows the output voltage waveforms for different ON times.
VARIABLE FREQUENCY CONTROL
In this method of control, chopping frequency f is varied keeping either ton or
Toff constant. This method is also known as frequency modulation.
Figure 2.4 shows the output voltage waveforms for a constant ton and variable
chopping period T.
In frequency modulation to obtain full output voltage, range frequency has to be
varied over a wide range. This method produces harmonics in the output and for large
toff load current may become discontinuous.
STEP-DOWN

DC microgrids are desired to provide the electricity for the remote areas which are far from the main grid. The microgrid creates the open horizontal environment to interconnect the distributed generation especially photovoltaic (PV). The stochastic nature of the PV output power introduces the large fluctuations of the power and voltage in the microgrid and forced to introduce the controller for voltage stability.
There are many control strategies to control the voltage of a DC
microgrid in the literature. In this paper the proportionalintegral-derivative (PID) and fuzzy logic PID (FL-PID)
controller has been designed and compared in term of performance. Performance measures like maximum overshoot
and settling time of FL-PID compared with the PID proved that
the former is better controller. The controllers are designed and
simulated in the MATLAB programming environment. The
controllers has been tested for the real time data obtained from Pecan Street Project, University of Texas at Austin USA.

- by Francisco Gonzalez-Longatt
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- Power Electronics, Network Security, Power System, Housing

PWM controlled rectifiers can efficiently and economically be employed in lowand medium power applications of dc drives and in front-end converters of rectifier–inverter systems while maintaining the advantages of design simplicity and operation reliability of naturally commutated schemes. Due to the high dc voltage that is produced which is greater than the peak voltage of the utility supply, the ac–dc buck-boost converter is especially suited as a front-end power source in variable-speed drive systems to convert the utility supply voltage into a variable dc link voltage where a single-phase or a three-phase utilities power supply is available. In this paper, the dynamic model and steady state equivalent circuit of a single-phase ac–dc buck-boost converter fed dc motor with uniform PWM control is presented. The waveforms of voltage and current, the input and output characteristics of the converter are discussed and verified. Measured, computed and simulated results are shown
to be very close and the model is proved to be efficient and accurate.

- by Nabil Ahmed
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- Dc-Dc Converters
- by sinoy jhon
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- Dc-Dc Converters

An asymmetrical full bridge converter is proposed in the paper. The proposed converter achieves zero voltage switching of all the power switches. Zero current switching of all the output diodes are also achieved here. This in turn provides a highly efficienct operation. The proposed converter can
provide a high voltage gain and the voltages across the semi- conductor devices are effectively clamped. The converter can be utilised effectively in high voltage applications as embedded systems, renewable energy systems, fuel cells, mobility applications and uninterrupted power supply.

- by IJMER Journal
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- Dc-Dc Converters
- by Subashini Murugaian
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- Solar Energy, Dc-Dc Converters
- by Serkan Bahçeci
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- PEM fuel cells, Dc-Dc Converters

This paper proposes a modification in the
maximum power point tracking (MPPT) by using model
predictive control (MPC). The modification scheme of the
MPPT control is based on the perturb and observe algorithm
(P&O). This modified control is implemented on the dc-dc
multilevel boost converter (MLBC) to increase the response of
the controller to extract the maximum power from the
photovoltaic (PV) module and to boost a small dc voltage of it.
The total system consisting of a PV model, a MLBC and the
modified MPPT has been analyzed and then simulated with
changing the solar radiation and the temperature. The
proposed control scheme is implemented under program
MA TLAB/SIMULINK and the obtained results are validated
with real time simulation using dSPACE 1103 ControlDesk.
The real time simulation results have been provided for
principle validation.

In recent years Bi-directional dc-dc converters (BDC) have gained a lot of attention due to increasing need of system with bi-directional energy transfer. This paper presents design and simulation of bi-directional buck and boost converter. The importance is given in the model to the effect of non-linear parameters in voltage converters, such as equivalent series resistance ESL of the inductor, ESR of capacitor and RDS(on) of MOSFET switche. Simulations of a bi-directional buck and boost converter are performed with Matlab/Simulink.

The Maximum Power Point Tracking (MPPT) is a technique used in power electronic circuits to extract maximum energy from the Photovoltaic (PV) Systems. In the recent decades, photovoltaic power generation has become more important due its many benefits such as needs a few maintenance and environmental advantages and fuel free. However, there are two major barriers for the use of PV systems, low energy conversion efficiency and high initial cost. To improve the energy efficiency, it is important to work PV system always at its maximum power point. So far, many researches are conducted and many papers were published and suggested different methods for extracting maximum power point. This paper presents in details implementation of Perturb and Observe MPPT using buck and buck-boost Converters. Some results such as current, voltage and output power for each various combination have been recorded. The simulation has been accomplished in software of MATLAB Math works.

This paper highlights the importance of interleaved boost converter for Telecommunication Systems. The design aspects of interleaved boost converter with zero-voltage switching (ZVS) and zero-current switching (ZCS) is discussed in detail. The study includes the description of switch mode power supply, DC-DC Converter along with the characteristics of
power MOSFET switches and soft switching principle. The selection of inductor, output capacitor, and freewheeling diodes,and main switches, number of phases and choice of duty ratio for the proposed IBC in telecom sector is investigated.Theoretical analysis is carried out to emphasize the significance of IBC as a suitable power converter for telecommunication systems.

- by Preethi Clement
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- Power Electronics, Power converters and drives, Dc-Dc Converters

Pulse width modulation (PWM) is used to generate pulses with variable duty cycle rate. The rapid rising and falling edges of PWM signal minimises the switching transition time and the associated switching losses. This paper presents a DC motor speed controller system using PWM technique. The PWM duty cycle is used to vary the speed of the motor by controlling the motor terminal voltage. The motor voltage and revolutions per minutes (RPM) obtained at different duty cycle rates. As the duty cycle increases, more voltage is applied to the motor. This contributes to the stronger magnetic flux inside the armature windings and the increase the RPM. The characteristics and performance of the DC motor speed control system was investigated. In this paper, a PIC microcontroller and a DC-DC buck converter are employed in the DC motor speed controller system circuit. The microcontroller provides flexibility to the circuit by incorporating two push button switches in order to increase and to decrease the duty cycle rate. The characteristics and performance of the motor speed controller system using microcontroller was examined at different duty cycle rate ranging from 19% to 99%.

- by MGES Journals
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- Microcontrollers, Dc Motor, Dc-Dc Converters, Pulse Width Modulation

In battery powered systems; many cells are used in different configuration to get the desired output power. But there is always constraint of space in high voltage application. A DC-DC boost converter increases the voltage and reduces the cells required. They are mainly used in battery powered applications like Electric Vehicle (EV) and high brightness LED. The discussed system consists of a boost converter, a MOSFET driver unit and a controller unit using ATMega328 microcontroller. The driver circuit isolates the power circuit from the low power controller unit and amplifies the pulse so as to trigger the MOSFET. Output voltage feedback is taken from the converter using voltage divider arrangement. This feedback voltage is given as analog input to controller which in turn generates a PWM signal which drives the converter. This system is implemented in simulation and hardware and the results are presented. Further Multi device boost converter topology is also discussed and its open loop hardware results are given.

- by Apekshit Bhowate
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- Dc-Dc Converters

DC/DC converters are massively used for switch-mode regulated power supply, renewable energy conversion systems and electrical drives. Conventionally analog methods were popular for control of these converters. This paper elucidates a digital controller using digital filter architecture, which supports fixed-point algorithm. Digital controller application to DC/DC converters has always been considered because of their superiority over analog controller. In digital controller, the control strategy can be altered or reprogrammed without the need of significant hardware changes. The digital controller improves response of DC-DC converter by varying loop-gain, cross-over frequency and phase margin. Closed loop digital control of buck and boost converter is presented and the results are obtained for varying operating conditions and verified using MATLAB/Simulink.

PV (Photovoltaic) systems are one of the most renowned renewable, green and clean sources of energy where power is generated from sunlight converting into electricity by the use of PV solar cells. Unlike fossil fuels, solar energy has great environmental advantages as they have no harmful emissions during power generation. In this paper, a PV system with battery storage using bidirectional DC-DC converter has been designed and simulated on MATLAB Simulink. The simulation outcomes verify the PV system's performance under standard testing conditions.

- by Md Kafiul Islam
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- Photovoltaic Solar Cells, Photovoltaic, Dc-Dc Converters, Solar PV

Power management plays a major role in virtually every electronic system because it controls, regulates, and distributes DC power throughout the system. Therefore, the DC power management subsystem can affect the reliability, performance, cost, and time-to-market of the associated electronic equipment.
Power management subsystems enable an electronic system to function properly by supplying and controlling its DC power. An analogy is that a power management subsystem functions in a manner similar to the body’s blood vessels that supply the proper nutrients to keep the body alive. Likewise, the power management subsystem supplies and controls the power that keeps an electronic system alive.

- by Nikola Zlatanov
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- Dc-Dc Converters, AC / DC Power Supplies, DC Power Supply, DC Power distribution

Abstract—DC–DC converters with voltage boost capability are widely used in a large number of power conversion applications, from fraction-of-volt to tens of thousands of volts at power levels from milliwatts (mW) to megawatts (MW). The literature has reported on various voltage boosting techniques in which fundamental energy storing elements (inductors and capacitors) and/or transformers in conjunction with switch(es) and diode(s) are utilized in the circuit. These techniques include switched capacitor (charge pump), voltage multiplier, switched inductor/voltage lift, magnetic coupling and multi-stage/-level, and each has its own merits and demerits depending on application, in terms of cost, complexity, power density, reliability, and efficiency. To meet the growing demand for such applications, new power converter topologies that use the above voltage boosting techniques, as well as some active and passive components, are continuously being proposed. The permutations and combinations of the various voltage boosting techniques with additional components in a circuit allow for numerous new topologies and configurations, which are often confusing and difficult to follow. Therefore, to present a clear picture on the general law and framework of the development of next generation step-up dc–dc converters, this paper aims to comprehensively review and classify various step-up dc–dc converters based on their characteristics and voltage boosting techniques. In addition, the advantages and disadvantages of these voltage boosting techniques and associated converters are discussed in detail. Finally, broad applications of dc–dc converters are presented and summarized with comparative study of different voltage boosting techniques. Index Terms—Switched mode step-up dc–dc converter, PWM boost converter, voltage multiplier, voltage lift, switched capacitor, switched inductor, coupled inductors, transformer, multistage converter, multilevel converter.

- by Mojtaba Forouzesh
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- Dc-Dc Converters, Power transformers, Multilevel Converters, Multistage
- by Jihan Saeed
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- Renewable Energy, Dc-Dc Converters

Design of phase-shifted full bridge zero voltage switching DC-DC converter has been very challenging due to circuit parasitic effect on the system dynamics. This paper presents steady-state analysis and iterative approach for the systemic design of phase-shifted full bridge DC-DC converter with improved dynamic performance and satisfactory operational requirement in terms of zero-voltage switching range, operating switching frequency and switching resonance. A 3 kW DC-DC converter is designed using the iterative design approach and the system dynamics performance was investigated in the MATLAB/Simulink environment. The converter zero-voltage switching simulation results were satisfactory with 90% efficiency under full load condition. 1. INTRODUCTION Phase-shifted full-bridge (PS-FB) DC-DC converter is widely used in high power application due to the advantage of high power handling capability [1], [2]. The conventional full-bridge converter has issues of ringing effect, circulating current, high switching and conduction losses but easily eliminated by employing phase-shifted PWM switching control that allows FET device zero voltage switching (ZVS) [3]. The switching control operation ensures that the converter transformer is connected to the source or shorted for continuous circuit current flow thereby limiting current ringing that might result from transformer leakage inductance. Smooth operation and improved dynamic performance of PS-FB ZVS DC-DC converter require the right choice of component value due to nonlinear operating nature and interdependency of circuit elements. This makes the analytical design of PS-FB ZVS DC-DC converter quite different from other conventional PWM converters. The components are chosen to precision in order to ensure that the circuit parasitics like the transformer leakage inductance, FET device output capacitance and transformer turn ratio are used to the system advantage for improved system dynamics. The phase-shifted full-bridge ZVS DC-DC converter design, analysis and implementation have been presented in several literatures [4]-[6]. Efforts are being made on efficient circuit design to address most of the prevailing challenges like the loss of ZVS under light load condition, high voltage spike at secondary output rectifier, duty cycle loss, high circulating current and electromagnetic interference. The proffered solutions are mostly based on circuit topology and control techniques modification [7]. Most of the recent proposed modify topologies require auxiliary components to increase the resonant inductance energy for wider ZVS. Addition of auxiliary component like magnetic inductor is presented in [8], transformer design modification in [9] and the addition of passive-active component like capacitors and diode in [10] for

DC-DC converters are power electronic circuits that convert a dc voltage to a different dc voltage level. Basic dc-dc converters are buck, boost, buck-boost, cuk and sepic converters. Every dc-dc converter has own function. This paper propose a buck converter is used to develop and verify the design procedure. Buck converter is a simple step down DC-DC converter. The output voltage depends on the duty cycle and voltage source. But by using a controller, the duty cycle automatically change to give the voltage needed. The function of the controller in dc converter is to maintain the constant output voltage in spite of disturbances in load current and input voltage. To design the controller in the dc-dc converter, the power stage and controller design equations are programmed in PSPICE. For this approaches, the result of simulation is an option available in PSPICE called Analog Behavioral Modeling (ABM) is used. The parameter of power stage and the component values of the error amplifier can be easily obtained by means of PSPICE dc analysis by using the sub circuit. This article present a methodology of design the controller, analysis and simulation buck converter with controller. Hardware implementations have been done successfully in verifying the operation of the buck converter.

- by Faiznur Izzati
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- Modeling and Simulation, Dc-Dc Converters, Electronics Engineering, PSPICE

This study presents a new circuit topology of the active edge resonant snubber-assisted half-bridge softswitching
PWM inverter-type DC–DC high-power converter for DC bus feeding power plants. The proposed DC–
DC power converter is composed of a typical voltage source-fed half-bridge high-frequency PWM inverter with a
high-frequency planar transformer link in addition to input DC busline side power semi-conductor switching
devices for the PWM control scheme and parallel capacitive lossless snubbers. The operating principle of the
new DC–DC converter treated here is described by using switching mode equivalent circuits, together with its
unique features. All the active power switches in the half-bridge arms and input DC buslines can achieve zero
current switching (ZCS) turn-on and zero voltage switching (ZVS) turn-off commutation transitions. The total
turn-off switching losses of the power switches can be significantly reduced. As a result, a high-switchingfrequency
isolated gate bipolar transistor (IGBT) can be actually selected in the frequency range of 60 kHz
under the principle of soft switching. The performance evaluations of the experimental setup are illustrated
practically. The effectiveness of the new converter topology is proved for low-voltage and large-current
DC–DC power supplies as DC bus feeding from a practical point of view.

- by Khairy Sayed
- •
- Power Electronics, Renewable Energy, Dc-Dc Converters, Power Supply

This paper is mainly concerned with the development of a new state-of-the-art prototype, high-efficiency, phase-shift, soft-switching, pulse-modulated, full-bridge DC-DC power converter with a high-frequency power transformer, which is... more

Efficiency is one of the most important aspects to consider in the design of electric systems for mobility applications. In this study, the interface between the storage system and the inverter is considered. This interface is a step-up DC-DC converter aimed to boost the energy storage voltage to the inverter voltage. This paper introduces the analysis, design, and comparison of four topologies of the interleaved boost DC-DC converter evaluating the effect of magnetic coupling in multi-phase and modular circuits. Additionally, a novel idea of a four-phase coupled inductor is presented. These power DC-DC converters are designed in order to find the suitable arrangement with the best efficiency.

- by Wilmar Martinez and +1
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- Electric Vehicles, Dc-Dc Converters, Magnetics

The devices generally used in industrial, commercial and residential applications need to undergo rectification for their proper functioning and operation. Hence there is a need to reduce the line current harmonics so as to improve the power factor of the system. This has led to designing of Power Factor Correction circuits. This project presents a power factor corrected (PFC) bridgeless (BL) buck–boost converter-fed brushless direct current (BLDC) motor drive as a cost-effective solution for low-power applications. The conventional PFC scheme of the BLDC motor drive utilizes a pulse width-modulated voltage source inverter (PWM-VSI) for speed control with a constant dc link voltage. This offers higher switching losses in VSI as the switching losses increase as a square function of switching frequency. A BL configuration of the buck–boost converter is proposed which offers the elimination of the diode bridge rectifier, thus reducing the conduction losses associated with it. A PFC BL buck–boost converter is designed to operate in discontinuous inductor current mode (DICM) to provide an inherent PFC at ac mains. The simulation results are presented by using Matlab/Simulink software. The proposed concept can be extended with cuk converter for BLDC drive applications using Matlab/Simulink software KEYWORDS: Bridgeless (BL) Buck–Boost Converter, Brushless Direct Current (BLDC) Motor, Discontinuous Inductor Current Mode (DICM), Power Factor Corrected (PFC), Power Quality, CUK converter.

Abstract—This paper proposes a family of soft switching bidirectional converters. In many applications, the bidirectional converters operate over a wide range of duty-cycle and load variations. In the proposed converters, in order to extend the ZVS operation range, two supplemental voltage sources utilizing passive components are implemented in the auxiliary circuit. By using this method, the soft switching features are ensured for an extensive range of the converter duty-cycles. This is achieved independent of the output power value or the converter operation mode and so, soft switching is ensured within the entire converter operating region. In these converters, all semiconductors components are soft switched, and the auxiliary circuit does not contribute to the complexity of the control circuit. Also, no extra voltage stress exists on the main switches and the voltage stress on the auxiliary switches is lower than the main switches voltage stress. In this paper, the proposed bidirectional buck/boost converter is analyzed and to confirm the feasibility of the proposed method, experimental results of a 150-W prototype converter are presented. Index Terms—Pulse width modulation (PWM) dc-dc converters, Bidirectional dc–dc converter (BDC), soft-switching techniques, zero-voltage switching (ZVS), zero-voltage switching (ZVT).

- by Mohammad Reza Mohammadi and +1
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- Power Electronics, Renewable Energy, Dc-Dc Converters, Hybrid Electric Vehicles

In this paper, Analysis and comparison of the different types of DC-DC converters is done. The operating principle and the parameter of the buck-boost, cuk, speic and zeta converters are analyzed. The simulation is done in matlab in open loop control with pulse generator and also in closed loop control with Proportional Integral controller (PL). The input voltage range has been varied from 170V to 270V and output voltage is ovserved.

- by IJSRD Journal
- •
- Dc-Dc Converters, Zeta, Buck-and-boost Converter, Cuk
- by siva gowri
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- Dc-Dc Converters, Boost Converter

Recently, Electric Vehicles (EVs) have required high power density and high efficiency systems in order to save energy and costs. Specifically, in the DC-DC converter that feeds the non-propulsive loads in these vehicles, where the output voltage is much lower than the one of the energy storage unit. Therefore, the output current becomes quite high, and the efficiency and power density are reduced due to the high current ratings. Furthermore, magnetic components usually are the biggest contributors to the mass and volume in these converters. This paper proposes a Three-phase LLC resonant converter with one integrated transformer where all the windings of the three independent transformers are installed into only one core. Using this technique, a high reduction in the core size and thereby an increment in the power density and a reduction of the production cost are obtained. In addition, this integrated transformer is intended to be applied in the novel Three-phase LLC resonant converter with Star connection that is expected to offer reduction of the imbalanced output current, which is produced by tolerances between the phase components. Finally, the proposed converter with the novel integrated transformer is discussed and evaluated from the experimental point of view. As a result, a 70% reduction in the mass of the magnetic cores was achieved.

- by Wilmar Martinez and +1
- •
- Electric Vehicles, Dc-Dc Converters, Resonant Converters
- by IOSR Journals
- •
- Control Systems Engineering, Control Systems, Dc-Dc Converters

The solar power system consists of solar cells, converter, inverter, filter, switch mode power supply, load. In that solar cells and inverter plays a vital role in increasing the efficiency of the system. In practice, nearly all photovoltaic energy conversion uses semiconductor materials in the form of a p-n junction to potentially satisfy the requirements for photovoltaic energy conversion. High efficiency under wide input voltage range of the photovoltaic array is introduced by two new, components one for DC-DC converter and one inverter. In this paper, we will compare the types of solar cells and the inverter with their specifications.

- by Ijariit Journal and +1
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- Solar Cell, Dc-Dc Converters

– Now a days, mostly available energy sources in atmosphere is solar energy. Due to different atmospheric conditions the solar energy availability varies widely with ambient temperatures. Hence the PV system maximum power point (MPP) is not stable.Therefore, a maximum power point tracking (MPPT) controllers are needed to operate the PV at its MPP.To extract the efficient energy from PV array the maximum power point tracking (MPPT) algorithms are required.This paper focuses on dc-dc converter input source of solar energy, its investigation of various MPPT algorithms namely Perturb and Observe (P&O), Incremental Conductance (IC), Fuzzy Logic Control (FLC). These algorithms are compared on the basis of the tracking time, irradiance variation and operating point operations. The paper thus presents advantages, disadvantages and characteristics of different MPPT algorithms for PV applications.

- by Rajyalakshmi Vunnam and +1
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- Power Electronics, Electrical Drives, Dc-Dc Converters, Power Electronics Sepic Converter

— This paper present a speed control of DC motor system powered by a photovoltaic source via Luo DC-DC. Luo converters are new generation of DC-DC converters on power electronics which presents better performances and high accuracy. As known, the produced voltage in a photovoltaic system is not stable, controller's techniques are required to guaranties a continuous voltage in the DC motor and thereafter the desired rotation speed. A PI-Fuzzy controller technique is proposed to control periodically the transferred voltage to the DC motor. The mean goal of the proposed system is the use of new DC-DC converter as intermediate controlled by Fuzzy logic strategy in order to reach better pursuit with low ripples of the DC motor speed. Multiples simulations are done to improve the functionality and the good behaviour of the proposed system.

- by Abdelghani El Ougli
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- Renewable Energy, Fuzzy Logic Control, Dc-Dc Converters