Interleaved Buck-Boost Converter Research Articles

Design of Battery Charging System with CC-CV Method Using Interleaved Buck-Boost Converter

The transition of renewable energy has become an interesting issue and a worldwide concern that is frequently discussed. Solar panels are regarded to have the most potential in tropical areas like Indonesia. However, weather and sunlight intensity have a substantial impact on the amounts of electricity generated by solar panels. Therefore, a battery which functions as a backup supply is required. Lead acid batteries are used in numerous applications. The performance of lead-acid battery is commonly influenced by temperature and charging time, which makes it vulnerable to overcharging. Multistage charge methods, namely Constant Current-Constant Voltage (CC-CV), are used to extend battery life, reduce charging time, and avoid the risk of overcharging. Fuzzy Logic Controller (FLC) is used to adjust charging current and voltage on the battery based on the setpoint. Based on the CC-CV charging system simulation results, a constant current value can be obtained when the CC condition is 4.5 A, and a transition to the CV condition occurs when the voltage value on the battery reaches 14.4 V. When the battery reaches its maximum capacity, the current is reduced to 3% of the battery’s capacity. The rate of fully charged current triggers the relay to turn on, to ensure that the charging process has been completed.

State-Feedback Control of Interleaved Buck–Boost DC–DC Power Converter with Continuous Input Current for Fuel Cell Energy Sources: Theoretical Design and Experimental Validation

It is well known that the classical topologies of Buck–Boost converters drain pulsating current from the power source. These pulsating currents entail acceleration of the aging rate of the fuel cell. In this paper, we are considering a Buck–Boost DC–DC converter topology featuring continuous input current. The converter interleaved structure ensures the substantial increase in power density compensating power losses related to the converter switching nature. The control objective is to enforce the DC-bus voltage to track its desired value despite load uncertainties and to ensure adequate current sharing between the different parallel modules of the fuel cell interleaved Buck–Boost converter (FC-IBBC). The point is that the internal voltage of the fuel cell is not accessible for measurement. Therefore, the state-feedback control, which consists of nonlinear control laws, is designed on the basis of a nonlinear model of the FC-IBBC system. We formally prove that the proposed controller meets its objectives, i.e., DC-bus voltage regulation and equal current sharing. The theoretical proof relies on the asymptotic stability analysis of the closed-loop system using Lyapunov stability tools. The theoretical results are well confirmed both by simulation, using MATLAB®/Simulink®, and by experimental tests using DS 1202 MicroLabBox.

Sampled-Data Model of a Two-Phase, Dual Interleaved Buck–Boost Converter With PCM

A sample-data modeling strategy for a 30-kW, two-phase dual interleaved buck–boost converter with peak current control is analyzed in this article. A small-signal converter model is derived to characterize the system utilizing the current peaks of the two interleaved phases and a half-symmetry, state-space representation of the circuit. The model is experimentally verified using a 32-kW, 350-V prototype that owns 7.6 kW/kg and 97.1% of power density and efficiency, respectively. A description of the controller, developed in a high-performance microcontroller, is also presented together with the experimental verification, detailing the design of the compensating ramp for a wide load range. Measured results are contrasted with the sample-data model predictions, using both transient and frequency responses, and evaluating the controlled converter dynamics at 14, 21, 26, and 30 kW. The comparison reveals the effective validity of the presented sample-data model and the effects of the supply to the dynamic performance of the high-density converter.

Modeling, Analysis and Implementation of an Improved Interleaved Buck-Boost Converter

In this brief an improved Interleaved Tri-state Buck-Boost converter (ITBBC) is newly proposed and developed. The ITBBC demonstrates excellent transient performance compared to existing Interleaved Buck-Boost converter (IBBC), mainly due to right-half-plane (RHP) zero free control-to-output (CTO) transfer function. It also produces lesser ripple than the existing Tri-state Buck-Boost converter (TBBC), due to interleaving operation. An optimized generalized Type-III controller has been employed, to improve the stability and transient performance of the closed-loop converter. The output voltage response has been investigated under load transient condition. It is appeared that the output voltage of ITBBC exhibits best transient response in both buck as well as boost modes. The experimental output voltage along with input current ripples of ITBBC, TBBC, and IBBC has been determined. It is clear that the ITBBC generates lesser ripple than the TBBC, and as expected, the IBBC produces the lowest ripple. It is also realized that due to interleaving, ITBBC exhibits better efficiency than TBBC. The proposed ITBBC can be used in applications wherever fast-response buck/boost action is needed.

Design and Implementation of an Isolated Interleaved Buck Boost Converter with Phase Shifted Control

tThis tpaper tfocuses ton tdeveloping ta tnovel method tfor tthe tdesign tof tdiscrete tbuck tbooster tconverter with tsingle tphase tpower tconsumption. tIn tthis tmethod, tit uses tconverters tbased ton thigh tfrequency tfrequency bridge-less tinterlaced twidth trectifiers. tThe tmerit tof tthis method tis tthat tby tincorporating tinterleaved tboost converters tinto tcomplete tbridge tdiode trectifiers, tswitching and tconduction tlosses tcan tbe tsignificantly treduced. tHere, we tanalyze tthe twhole tbridge tin tdetail twith tthe tdiscrete buck-booster tconverter tvoltage tcoefficient. tVoltage coefficient tcorrection thelps tincrease tthe tvoltage tgain tin tthe circuit. tWe tuse tan toptimized tphase tshift tmodulation strategy ton ta tcomplete tbridge tdiscrete tbuck tboost converter tfor timproved tperformance tand tincrease toverall efficiency. tTransformers twith tlow tratios tand tlow tvoltage MOSFETs tand tdiodes tcan tbe timplemented tto timprove efficiency. tBased ton ta tvariety tof tinterlaced tbooster converters, tincluding ttraditional tbooster tconverters tand high tstep-up tbooster tconverters twith tvoltage tmultipliers. From tthe tpoint tof tview tof tconversion tefficiency, tthe discrete tbuck-boost t(IBB) tconverter tis ta tgood tapproach. Unfortunately, tthe tfly-back tconverter tis ta ttypical tIBB converter, tbut tthe tefficiency tis tstill tvery tlow tdue tto tthe high tvoltage tpressure ton tthe tcomponents tand trectangles. In this tpaper twe tgive tan tinput tDC tsupply tof t12V tand tan output tvoltage tof t140V. tThe toutput tprototype twas designed tto tvalidate tthe teffectiveness tof tthe tproposed tIBB converters tand tits tcontrol tstrategies.

Comparative analysis of non-inverting buck-boost converter topologies for fuel cell low voltage applications

The FC sources are unregulated voltage sources and require power converter devices to get a regulated output voltage. When these devices are used in low voltage low power applications DC-DC buck-boost converters (BBC) are required to get the regulated voltage on load side. The multi device multi switch operation of the buck-boost converters are usually employed for successful operation of the FC stacks. In this paper, the different non-inverting type of buck-boost converters i.e., buck-boost converter (BBC), multi-device buck-boost converter (MDBBC), interleaved buck-boost converter (IBBC), and multi-device interleaved buck-boost converters (MDIBBC) are analysed and comparative study among them are presented with respect to the parameters like, ripple current, component size, power losses and efficiency. The comparative study demonstrates that the multi device converter topologies are more efficient than the other converter topologies employed in low voltage low power applications.

Comparative analysis of non-inverting buck-boost converter topologies for fuel cell low voltage applications

The FC sources are unregulated voltage sources and require power converter devices to get a regulated output voltage. When these devices are used in low voltage low power applications DC-DC buck-boost converters (BBC) are required to get the regulated voltage on load side. The multi device multi switch operation of the buck-boost converters are usually employed for successful operation of the FC stacks. In this paper, the different non-inverting type of buck-boost converters i.e., buck-boost converter (BBC), multi-device buck-boost converter (MDBBC), interleaved buck-boost converter (IBBC), and multi-device interleaved buck-boost converters (MDIBBC) are analysed and comparative study among them are presented with respect to the parameters like, ripple current, component size, power losses and efficiency. The comparative study demonstrates that the multi device converter topologies are more efficient than the other converter topologies employed in low voltage low power applications.

Emulator Based on Switching Functions for a Dual Interleaved Buck-Boost Converter

Under the unavailability of some components of a complex system, the Hardware In the Loop (HIL) tool allows the emulation of other subsystems. When these devices are not available, a customized emulator can be developed based on the Piecewise Linear Model (PWLM) and a numerical method for solving the differential equations system. However, these implementations require the use of a Field Programmable Gate Array (FPGA) with extensive hardware resources. In this article we propose the use of switching functions for the modeling of power converters of a Hybrid Power System (HPS), allowing the reduction of hardware resources of the FPGA, and the number of steps per switching cycle is increased. The results are compared with SABER simulations and a PWLM evaluated with the Euler method.

Simulation and Comparison between Conventional and Interleaved Buck-boost Converter for Grid-Connected PV System

This paper presents a mathematical modelling of buck boost converter used for grid-connected PV systems. It is related to the optimization of the first input stage of a grid tie inverter PV system. The interleaved buck-boost DC-DC converter is proposed to increase the performance of the entire system. The input current is shared between the inductors. As a result, the current ripples are reduced and a good reliability in power electronic systems is gained. The interleaved buck-boost converter is presented and compared in simulation.

Performance Comparison of PV based Buck Boost and Interleaved Buck Boost Converter Inverter based Solar Systems

The power generated from the nature source such as wind, solar, Biomass etc, plays a vital role in the generation of power. Here we deal with the solar energy resource in inverters as an interleaved buck boost converter. By combining the photovoltaic power system with the inverter and interleaved buck boost converter is used to convert the Direct Current output of the converter as an Alternate Current used single phase inverter. The comparison of the above mentioned systems is done in terms of output power, ripple voltage and Total harmonic distortion.

Improvement of Dynamic Characteristics using ANN Controlled Interleaved Buck Boost Converter Inverter based Solar System

Interleaved buck boost converter is a good interface between PV array and inverter. The Main part of the research is as designing the model and gets a simulated result. An improved model of ANN with controls the solar energy power is applied in the converter of buck boost interleaved. A parallel system of arrangement is used in the model of converter so as to reduce the uncertainty of the direct flow of current of the output source. Using solar power the direct current flow is increased with the help of converter boost. By the model of unique phase bridge inverter, alternate current is used in increase the power of direct current by 50 Hz. The objective of this work is to improve dynamic response of closed loop system using ANN controller. The Block diagram and case studies are explained in details.

A High Efficiency Input/Output Magnetically Coupled Interleaved Buck–Boost Converter With Low Internal Oscillation for Fuel-Cell Applications: CCM Steady-State Analysis

The performance of dc–dc converters plays a vital role in the exploitation of renewable energy sources such as solar and fuel cell (FC). This paper demonstrates the feasibility of using the input/output (I/O) magnetically coupled interleaved buck–boost converter, improving the conventional interleaved cascaded buck–boost converter in FC applications. While keeping the same step-up/step-down voltage transfer ratio, the proposed topology facilitates operating conditions with its nonpulsating I/O currents and high efficiency using interleaved technique and reducing switches' voltage stresses, respectively. The steady-state operation of the converter is analyzed based on the state-space-averaging method and supported with simulation results. The prototype setup of 360-W and 36-V output voltage for an FC with a brand of “FCgen 1020ACS” Ballard Power Systems, Inc. was implemented. Experimental results are presented to verify the theoretical expected merits of the converter, including high efficiency and nonpulsating I/O currents.

Power system simulation of fuel cell and supercapacitor based electric vehicle using an interleaving technique

This paper investigates the modeling approach based on the Matlab SimPowerSystems Toolbox (SPS) of a fuel cell electric vehicle (FCEV). The objective of this approach is to increase the accurate modeling of the power source, the power converter and the load to evaluate the full system performances since the simulation step. In this study, a supercapacitor (SC) is associated as an auxiliary device with the FC to ensure the power reversibility in the drive train. The FC and the SC are connected to the dc bus throughout an interleaved boost converter (IBC) and an interleaved buck-boost converter (IBBC) respectively. The control of the proposed system is designed using the discrete proportional integral (PI) controllers and the digital width pulse modulation (DPWM). The proposed controller improves the dynamic performance of the IBC converters by achieving a robust bus voltage and inputs currents against load disturbances. The converter is designed through simulation using SPS and the results are discussed.

Electric Vehicle Battery Life Extension Using Ultracapacitors and an FPGA Controlled Interleaved Buck–Boost Converter

This paper describes the implementation of a hybrid energy storage system (HESS) using ultracapacitors (UCs) to protect the batteries of an electrical vehicle (EV) from high-peak currents and therefore extend their lifetime. A field-programmable gate array (FPGA) controlled interleaved bidirectional buck-boost converter working in a discontinuous conduction mode, has been designed to transfer the energy between the batteries and the UCs. The FPGA is responsible of generating all the converter gate signals and implements the control stage needed to smooth the battery current peaks. The control strategy is based on dividing the current demand of the motor into two parts (high-frequency current and low-frequency current), the batteries supply the low frequency part and the UCs supply the high-frequency part. Experimental tests have been carried out driving the EV under different scenarios. Experimental results demonstrate the good behavior of the proposed HESS, although the potential battery life extension is still under quantification. The consumption of the EV has been increased due to the converter losses, this increase is minimum under typical driving scenarios, but is quite important in start-stop driving cycles.