Dc/Dc Converter Articles & Analysis
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Design and implementation of fuzzy logic controller for high performance coupled inductor DC-DC converter
This paper presents the design and implementation of fuzzy logic controller for the HPCI DC-DC converter. The converter contains non-linear elements making the mathematical model more complex which instigate the use of FLC. The proposed FLC is implemented using microcontroller AT89C52. The closed loop hardware results of the HPCI DC-DC converter is presented and discussed.Keywords: fuzzy logic ...
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Digital control of multiple output DC-DC converter using 16 bit microcontroller
This paper presents the design and implementation of a digital controller for a multiple output buck converter operating at the switching frequency of 100 KHz. The implementation of the digital controller is using a low cost 16-bit fixed point PIC microcontroller. Compensator using digital control techniques and simulink model of the converter in closed loop is also presented. This paper proposes ...
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Nonlinear phenomena in DC–DC buck converter by means of iteration mapping technique
In this paper, the nonlinear phenomenon in DC/DC buck converter is studied. A practical design for a DC/DC buck converter was considered in this study, which results in a more comprehensive understanding for the phenomenon. The nonlinearity of the buck converter is studied using the iteration mapping technique. The results showed that if the system has a well–designed buck converter as well as a ...
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Isolated digitally controlled voltage mode forward converter with excellent audio rejection
This paper presents the implementation of feedforward in digital domain to meet the audio susceptibility as per MIL STD 461C for voltage mode digitally controlled DC-DC converters. The feed-forward is accomplished through the estimation of duty ratio based on the input voltage at every switching cycle. The prototype converter developed is having galvanic isolation in the forward and feedback ...
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Hybrid modelling and control of a synchronous DC-DC converter
In this paper, the problem of hybrid modelling and control of a fixed frequency DC-DC converter, namely the Non-inverting Buck-Boost converter is addressed. The v-resolution method is used to capture the hybrid nature of the system. Two mixed logical dynamical (MLD) models are obtained for the converter using hybrid systems description language (HYSDEL). In the process of using v-resolution ...
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A control method to improve the efficiency of a soft–switching non–isolated bidirectional DC–DC converter for hybrid and plug–in electric vehicle applications
Hybrid energy storage system (HESS) can be adopted in hybrid, plug–in hybrid, and pure electric vehicles (HEV, PHEV, and EV), where a bidirectional DC–DC converter (BDC) is used to connect batteries and ultra–capacitors. The efficiency improvement of the BDC is beneficial to increase the efficiency viability of HESS. Due to ZVS, high efficiency can be obtained at heavy load operations while the ...
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Analysis and design of a hybrid phase modulated converter
High–frequency transformer isolated DC–to–DC converters are widely used for power conversion in alternate energy and other applications. In such applications, it is important for the converter to operate with wide variations in input voltage. A hybrid phase modulated converter (HPMC) can achieve this with soft–switching characteristics. This paper presents the analysis of such a hybrid phase ...
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Bridgeless single stage flyback converter–based computer power supply
A power factor corrected (PFC) bridgeless converter–based computer power supply (CPS) using multioutput flyback dc–dc converter is presented in discontinuous conduction mode (DCM) of operation. In place of the conventional diode bridge to convert ac voltage into uncontrolled dc voltage, two multioutput flyback converters are connected in anti–series across the single phase ac supply. The diode ...
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A synthetic ripple buck converter with dynamic hysteretic band modulation
This paper presents an integrated DC-DC buck converter using a synthetic ripple hysteresis control scheme with a feed forward path to define the boundary of hysteresis band. The hysteresis band and the switching frequency are adjustable according to load current changes; therefore, it accelerates regulation and reduces overshoot. Full chip simulation indicated that the output voltage recovery ...
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Design and control of a Luo converter for variably loaded hybrid electric vehicle energy storage system
This paper presents the analysis and novel hybrid controller design for a 4-quadrant (4-Q) switched-capacitor (SC) Luo bidirectional DC/DC converter, applicable for hybrid electric and plug-in hybrid electric vehicle energy storage system (ESS) applications, based on power of traction motor and battery current gradient. Features of voltage step-down, voltage step-up, and bi-directional power flow ...
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Single-switch dual output flyback DC/DC converter with time multiplexing control
Controlling two outputs with a single controlling switch in the power converter presents difficulties when two contrasting actions are required to raise one output and decrease the other. This paper studies the application of time multiplexing control (TMC) technique on power converters, with particular interest on single-switch multiple-output converters. Each output has its own feedback control ...
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Comparison and evaluation of different DC/DC topologies for plug–in hybrid electric vehicle chargers
The battery charging system is a critical part of a plug–in hybrid electric vehicle (PHEV). The efficiency, charging speed, and cost of such chargers are crucial to the commercialisation of PHEVs. In this paper, the advantages and drawbacks of four potential PHEV charger topologies were compared based on their operations through simulation and experiments. Their electrical stress, efficiency, ...
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Design, control and performance analysis of a standalone solar–PV energy generating system
This paper presents the design, control and performance of a low power standalone solar–photovoltaic (PV) energy generating system. The system includes a maximum power point tracking (MPPT) controller along with a full bridge DC–DC converter, an energy storage system and a voltage source inverter (VSI). The detailed design and modelling of the system components are given with incremental ...
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Control of chaos in positive output Luo converter using slope compensation method
This paper illustrates the control of chaotic behaviour in positive output Luo converter by slope compensation method. Bifurcation analysis is carried out in the discrete domain for a current controlled Luo converter operating in the continuous conduction mode. As the reference current is varied, periodic 1 orbit undergoes a flip bifurcation, periodic doubling and finally enters into chaotic ...
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Analysis, design and control of a two stage improved power quality telecommunication power supply
This paper deals with the power quality improvement at the utility interface of a telecommunication switched mode power supply (SMPS) of 12 kW rating. The first stage of this SMPS consists of a 6–pulse diode bridge converter that performs ac–dc conversion yielding an unregulated dc voltage. In the second stage, two boost rectifiers are connected together which feed to a boost dc–dc full bridge ...
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Reverse DC-Coupled PV+Storage
In 2018, Dynapower deployed the first DC-DC converter in a DC-coupled PV+S (PV + storage) configuration at an existing utility-scale PV+S installation. Since then, the innovative solar-plus-storage solution has gained traction due to the ability of DC-coupled PV+S to increase PV energy capture and decrease the costs as compared to AC-coupled energy storage solutions. Recent reports from IHS ...
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Classification and comparison of interfacing schemes for connecting fuel cells to a single-phase utility line
Based on a systematic classification of dc source to utility interfacing schemes, this paper presents six major interfacing schemes for connecting fuel cells to a single-phase utility line using high-frequency transformer isolated power converters. The operation, advantages and disadvantages are discussed for each scheme with examples and operating waveforms. Several features e.g., utility line ...
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A two-stage power electronic interface for fuel cell-based power supply system
The increasing energy demands, insufficient availability of power generation and increasing global environmental problems, need alternate/green power sources. Among the different green power technologies such as wind power, photovoltaic, gas turbine and fuel cell, the fuel cell-based distributed generation is considered as one of the most promising solutions for stand-alone/grid applications due ...
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A modern MPPT control algorithm based on α–MPP pass–through detection and β–acceleration mechanism
A modern maximum power point tracking (MPPT) method based on the incremental conductance (IncCond) control algorithm is discussed. This method features a variable step iteration of duty ratio to get over the trade–off between dynamic performance and steady state oscillation around maximum power point (MPP). Moreover, in the aim to get an excellent precision and a swift response independently of ...
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Novel regulated DC/DC and DC/AC power converters
Power sources with a desired voltage profiles, are required in many applications including renewable energy. Although in most cases, a sinusoidal waveform of specified amplitude and frequency is of interest, other types of voltage profiles, such as square, trapezoidal, triangular, etc., may also be required in amplifiers, shakers, mechatronics, etc., applications. In this paper, a capacitor ...
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