scispace - formally typeset
Search or ask a question

Showing papers on "Buck–boost converter published in 2022"


Journal ArticleDOI
TL;DR: A novel dc–dc light-emitting diode driver employing an interleaved converter is proposed and analyzed, and the circuit efficiency as high as 95.0% is measured and satisfactory performance has verified the feasibility of the proposed converter.
Abstract: In this article, a novel dc–dc light-emitting diode driver employing an interleaved converter is proposed and analyzed. The circuit topology mainly consists of two parallel buck–boost converters. A coupled inductor, which is composed of a magnetic core and two windings, is used to replace the energy storage inductors of the two buck–boost converters. This not only does not add any components, but also saves a magnetic core. The buck–boost converters are designed to operate near boundary conduction mode. Due to the characteristics of magnetic flux balance, the magnetic-excited current can be converted between the windings of the coupled inductor. By using the magnetic-excited current to release the charge stored in the parasitic capacitors of the active switches, these switches can fulfill zero-voltage switching on (ZVS) without the use of any auxiliary switches, active clamping circuits, or snubber circuits. Moreover, the freewheel diodes of both buck–boost converters can achieve zero-current switching off (ZCS). The steady-state analyses for different operation modes are provided, and the mathematical equations for designing circuit components are conducted. Finally, a 200-W prototype circuit was built and tested to verify the analytical predictions. According to the experimental results, all the semiconductor devices are operated at either ZVS or ZCS, and the circuit efficiency as high as 95.0% is measured. Satisfactory performance has verified the feasibility of the proposed converter.

23 citations


Journal ArticleDOI
TL;DR: In this article , a bridgeless Cuk-derived power factor corrected (PFC) converter with reduced component count for on-board EV charging application is proposed, where the output inductor of the converter is operated in discontinuous current mode to attain PFC naturally at ac mains.
Abstract: This article proposes a novel single-phase bridgeless Cuk-derived power factor corrected (PFC) converter with reduced component count for on-board EV charging application. The unique feature of this proposal is to design and operate the output inductor of the converter in discontinuous current mode for the complete power range to attain PFC naturally at ac mains, thereby not requiring the input voltage and input current sensing, which reduces the converter cost, and improves the power density as well as converter robustness to high-frequency noise. The converter control is very simple in operation and easy in implementation with only a single sensor-based voltage control loop. The semiconductor components voltage stress of the proposed power converter is lower when compared to the traditional Cuk converter. The simulation results from PSIM 11 and experimental results are given by testing a proof-of-concept hardware laboratory prototype to demonstrate the high performance of PFC operation of the proposed converter.

22 citations


Journal ArticleDOI
TL;DR: In this paper , a new high-gain transformerless dc/dc boost converter is proposed for PV micro-converter applications, where high voltage-gain is required to boost voltage at higher voltage levels, converter switching devices are under low voltage stress.
Abstract: This article proposes a new high-gain transformerless dc/dc boost converter. Although they possess the ability to boost voltage at higher voltage levels, converter switching devices are under low voltage stress. The voltage stress on active switching devices is lower than the output voltage. Therefore, low-rated components are used to implement the converter. The proposed converter can be considered as a promising candidate for PV microconverter applications, where high voltage-gain is required. The principle of operation and the steady-state analysis of the converter in the continuous conduction mode are presented. A hardware prototype for the converter is implemented in the laboratory to prove the concept of operation.

20 citations


Journal ArticleDOI
TL;DR: In this article , an ultra-high step-up dc-dc converter with a combination of two stages boost converter, a coupled inductor, and a multiplier cell is proposed, which can achieve high voltage gain, low voltage stress on its power switches, and requiring a smaller inductor on low voltage side of the converter.
Abstract: In this article, an ultrahigh step-up dc–dc converter is proposed with a combination of two stages boost converter, a coupled inductor, and a multiplier cell. The secondary side of the coupled inductor is unified with the multiplier cell. In addition, leakage energy of the coupled inductor is recycled and transferred to output perfectly which causes high-efficiency performance. The main advantages of the converter include its high voltage gain, low voltage stress on its power switches, and requiring a smaller inductor on low voltage side of the converter. Power losses of the inductors are low due to the current sharing between the input inductor and the coupled inductor. Continuity of input current and existence of a common ground between the load and source make the converter suitable for different applications. The converter is compared with the other converters based on an analysis of its operation modes. Validity of the analysis and the converter performance are experimented using a 150-W prototype that converts 20 V from the input side to 400 V in output.

19 citations


Journal ArticleDOI
TL;DR: In this article , a dual-active-half-bridge (DAHB) converter with voltage balancing is proposed, which is composed of a conventional DAHB converter with an additional inductor and capacitor voltage balancer (LCVB).
Abstract: Conventional dual-active-bridge dc–dc converters require a dedicated voltage balancer or feedback control when they are used for a bipolar LVdc distribution system. This article proposes a dual-active-half-bridge (DAHB) converter with voltage balancing. The proposed converter is composed of a conventional DAHB converter with an additional inductor and capacitor voltage balancer (LCVB). The LCVB is added between the transformer and the output of the DAHB converter. Although the LCVB increases the switch current, it can balance the two output voltages without additional active switching device and feedback control under unbalanced load conditions. In addition, compared with the conventional DAHB converter, the LCVB can increase the zero-voltage-switching range of the DAHB converter and has no detrimental effect on the operation modes and performances. A 2.8-kW prototype was built and tested to verify the performances of the proposed converter.

15 citations


Journal ArticleDOI
TL;DR: In this paper, a buck-boost converter with coupled inductors is presented for fuel cell (FC) and photovoltaic (PV) applications, which benefits from low ripple input current, simple control, common ground sharing between input and output ports, lowvoltage stress across the power switches, positive output voltage, and quadratic voltage gain.
Abstract: A new buck–boost converter with coupled inductors is presented in this article. The converter benefits from low ripple input current, simple control (both power switches operate synchronously), common ground sharing between input and output ports, low-voltage stress across the power switches, positive output voltage, and quadratic voltage gain. Since the proposed converter has continuous input current, it is a proper choice for fuel cell (FC) and photovoltaic applications. Operating principles, mathematical calculation for steady-state operation, and small-signal modeling analysis are described in detail. Finally, an experimental 25-20-200 V prototype has been implemented to confirm all the mathematical derivation and aforementioned features of the proposed buck–boost converter.

15 citations


Journal ArticleDOI
TL;DR: In this paper , a multi-port bidirectional converter is proposed for energy storage in electric vehicles (EV), which has the ability to work in both step-up (boost) and step-down (buck) modes.

14 citations


Journal ArticleDOI
TL;DR: In this paper , a battery charging model is developed for solar PV system applications, where the energy drawn from the PV array is used for the battery charging by means of an isolated buck converter since the buckboost converter is not directly connected to the battery.
Abstract: In this paper, a battery charging model is developed for solar PV system applications. As a means of photovoltaic power controlling system, buck-boost converter with a Maximum Power Point Tracking (MPPT) mechanism is developed in this paper for maximum efficiency. This paper proposed a novel combined technique of hybrid Particle Swarm Optimisation (PSO) and Salp Swarm Optimization (SSO) models to perform Maximum Power Point Tracking mechanisms and obtain a higher efficiency for battery charging. In order to retrieve the maximum power from the PV array, the Maximum Power Point Tracking mechanism is observed which reaches the maximum efficiency and the maximum power is fed through the buck-boost converter into the load. The buck-boost converter steps up the voltage to essential magnitude. The energy drawn from the PV array is used for the battery charging by means of an isolated buck converter since the buck-boost converter is not directly connected to the battery. The Fractional Order Proportional Integral Derivative (FOPID) controller handles the isolated buck converter and battery to enhance the efficiency obtained through the Maximum Power Point Tracking mechanism. The simulation results show higher steady efficiency by using the hybrid PSOSSO algorithm in all stages. The battery is charged without losing the efficiency obtained from the hybrid PSOSSO algorithm-based Maximum Power Point Tracking mechanism. The higher efficiency was obtained as 99.99% at Standard Test Conditions (STC) and 99.52% at PV partial shading conditions (PSCs) by using the new hybrid algorithm.

13 citations


Journal ArticleDOI
TL;DR: In this article , a buck-boost converter with coupled inductors is presented for fuel cell (FC) and photovoltaic (PV) applications, which benefits from low ripple input current, simple control, common ground sharing between input and output ports, lowvoltage stress across the power switches, positive output voltage, and quadratic voltage gain.
Abstract: A new buck–boost converter with coupled inductors is presented in this article. The converter benefits from low ripple input current, simple control (both power switches operate synchronously), common ground sharing between input and output ports, low-voltage stress across the power switches, positive output voltage, and quadratic voltage gain. Since the proposed converter has continuous input current, it is a proper choice for fuel cell (FC) and photovoltaic applications. Operating principles, mathematical calculation for steady-state operation, and small-signal modeling analysis are described in detail. Finally, an experimental 25-20-200 V prototype has been implemented to confirm all the mathematical derivation and aforementioned features of the proposed buck–boost converter.

13 citations


Journal ArticleDOI
TL;DR: The proposed noninverting bidirectional buck–boost chopper accompanied by an auxiliary converter for battery storage that is installed in a light rail vehicle is controlled such that the capacitors of the auxiliary converter store and release most of the chopper energy instead of relying solely on a bulky and heavy inductor.
Abstract: This article proposes a noninverting bidirectional buck–boost chopper accompanied by an auxiliary converter for battery storage that is installed in a light rail vehicle. The proposed chopper is composed of two half-bridge cells called the main converter, an auxiliary converter consisting of many full-bridge converters connected in cascade, and a small-sized inductor. It is controlled such that the capacitors of the auxiliary converter store and release most of the chopper energy instead of relying solely on a bulky and heavy inductor. As a result, it is lighter and smaller than the four-switch noninverting buck–boost chopper. The operation, as well as the control of the proposed chopper, are experimentally tested using a down-scaled prototype. Furthermore, a comparison with the four-switch noninverting buck–boost chopper with respect to mass, volume, and efficiency is made to verify the efficacy of the proposed chopper.

12 citations


Journal ArticleDOI
TL;DR: In this article , a buck-boost dc-dc converter for continuous power flow control is presented, which utilizes a limited number of passive components, only four diodes and three inductors required, in addition to six capacitors.

Journal ArticleDOI
TL;DR: In this article, the authors proposed bridgeless power factor correction rectifiers suitable for use in any application which requires a positive or negative dc power supply, compared to previous works, is the provision of the common ground between input and output, which eliminates electromagnetic interference (EMI) associated with high rates of change of voltage and consequently reduces the need for EMI common mode filtering.
Abstract: This article proposes new common ground bridgeless power factor correction rectifiers suitable for use in any application which requires a positive or negative dc power supply. The main advantage of the proposed rectifiers, compared to previous works, is the provision of the common ground between input and output, which eliminates electromagnetic interference (EMI) associated with high rates of change of voltage and consequently reduces the need for EMI common mode filtering. The converter also provides step-down and step-up operation, and facilitates positive or negative output voltages with a low number of semiconductor devices operating simultaneously. High power factor, acceptable grid-side current quality, and high efficiency are also achieved. Two variants are presented, referred to as type-I and type-II, which offer common ground positive and negative dc voltages, respectively. Closed-loop control of the converters is provided by a dead-beat current controller in the inner loop. Experimental results are presented for a 500-W prototype, operating from 220 and 110 Vrms input to $\pm$ 48 and $\pm$ 200 Vdc output. The experimental results demonstrate the capability for step-down and step-up ac-to-dc power conversion with a peak efficiency of 96.8% and 96.6% in the positive and the negative outputs, respectively.

Journal ArticleDOI
TL;DR: In this article , an evolution of two-switch-based enhanced gain buck-boost converter (EGBBC) topologies is presented, which resulted in three different topologies exhibiting quadratic buckboost voltage gain named as EGBBC Type-1, Type-2, and Type-3.
Abstract: This article presents evolution of two-switch-based enhanced gain buck–boost converter (EGBBC) topologies. All these topologies exhibit quadratic buck–boost voltage transformation ratio together with common ground feature. The basis for these topological evolutions is the cascading of boost followed by restructured ZETA. Direct cascading of boost with ZETA yields a pseudo quadratic conversion ratio and an additional buck stage is mandatory to transform the gain to quadratic buck–boost form. Without adding additional stages and to yet realize the quadratic buck–boost transformation, a modified boost configuration at the front-end together with restructured cascading approach is adopted in the topological evolution. This evolution resulted in three different topologies exhibiting quadratic buck–boost voltage gain named as EGBBC Type-1, Type-2, and Type-3. Exhaustive steady-state and dynamic analysis is presented for Type-1, while brief formulations are listed for Type-2 and 3. Also, a comprehensive review of the reported buck–boost converters is made and compared with EGBBC features. A 10 ∼ 37 W, 15 to 10 V for bucking operation, and 75 V for boosting operation prototype is built for concept validation. A simple two-pole two-zero compensator is adopted for load voltage regulation. Measurement results demonstrate closed-loop system stability, robustness, and voltage regulation both in bucking as well as in boosting operation.

Journal ArticleDOI
TL;DR: In this paper , a buck-boost converter with a coupled inductor was proposed for distributed photovoltaic (PV) generation systems. And the proposed converter achieved a maximum efficiency rate of 96.58%.
Abstract: This paper presents a non‐isolated high step‐up buck–boost with a coupled inductor DC–DC converter relevant for distributed photovoltaic (PV) generation systems. The proposed topology can reach high voltage gain through the combination of a buck–boost converter with a coupled inductor. The configuration of the proposed converter allows to achieve a natural voltage clamp circuit for the switch, recovering the energy stored in the leakage inductance of the coupled inductor. Moreover, the converter allows soft‐switching conditions, that is, Zero Current Switching (ZCS) for the diodes and nearly ZCS for the active switch. Also, the proposed converter presents a low component count and common ground connection of the input and output. The proposed converter is evaluated theoretically by the principle of operation in continuous‐conduction mode (CCM) and discontinuous‐conduction mode (DCM), voltage gain derivation, external characteristics, semiconductor voltage stress, current stress, and design guidelines. Finally, a 650‐W, 36/380‐V, 50‐kHz prototype was built in the laboratory to experimentally evaluate the proposed converter, which reached a maximum efficiency rate of 96.58%.

Journal ArticleDOI
TL;DR: In this paper , a non-isolated switched inductor cell integrated high step-up voltage gain DC-DC converter with a charge pump mechanism is discussed, and the performance and small signal modeling of the converter in continuous conduction mode are extensively investigated, and voltage gain calculations for the two operational modes are derived.
Abstract: In this paper, a non‐isolated switched inductor cell integrated high step‐up voltage gain DC‐DC converter with a charge pump mechanism is discussed. The continuous conduction mode of the input current is a beneficial aspect of this converter, which is appropriate for electric vehicles, renewable energy, and LED applications. The proposed converter works in two distinct operating modes and provides a flexible range of voltage gain ratios. The performance and small‐signal modeling of the converter in continuous conduction mode are extensively investigated, and voltage gain calculations for the two operational modes are derived. The Markov technique is used to evaluate the converter reliability, component failure rates, and mean time to failures. The proposed converter is evaluated with the existing converters in terms of voltage, and current stress of each component, voltage gain, total component stress factor, component count, and reliability. The proposed converter's hardware prototype has been developed. To validate the theoretical calculations, the converter's simulation and experimental results are discussed. The converter has a maximum output voltage of 110 V and a switching frequency of 50 kHz. The converter's peak efficiency is 94.5%.

Journal ArticleDOI
TL;DR: In this article , a single-switch DC-DC boost converter structure operating under the high voltage gain and the low duty ratio is proposed using the PI control technique, which reduces the voltage stress and dynamic losses in the power semiconductors.
Abstract: In this study, a switched capacitor (SC)‐based single‐switch DC–DC boost converter structure operating under the high voltage gain and the low duty ratio is proposed using the PI control technique. High current and voltage stresses across the power switches and power diodes can be reduced by using the projected SC block. In addition, the proposed converter can achieve high voltage gain through shorter duty cycles, which directly reduces the voltage stress and dynamic losses in the power semiconductors. On the other hand, because the proposed converter includes a single power switch under different output powers and different loads, the control process is simpler than multiswitch structures. With the proposed converter, an output voltage of 10 times greater rather than the input voltage is obtained at 0.57 of the duty cycle. In this study, the fundamental functions of the proposed converter and the controller design steps are analyzed mathematically and tested in MATLAB/SIMULINK environment. As a result of the analysis, it was determined that the proposed topology works with a high performance at high frequency and variable load ranges. To validate the proposed converter and theoretical calculations, a 200‐W prototype was established under a continuous conduction mode (CCM) working state, with 48‐VDC input voltage and 400‐VDC output voltage. Finally, the simulation results were tested and verified through the experimental results.

Journal ArticleDOI
TL;DR: In this article , a multiport dc-dc converter (MPC) with four ports suitable for renewable energy applications is presented. And the converter includes a bidirectional buck-boost converter to charge/discharge an energy storage.
Abstract: This article presents a multiport dc–dc converter (MPC) with four ports suitable for renewable energy applications. The converter is composed of two boost converters and a switched capacitor. The converter includes a bidirectional buck–boost converter to charge/discharge an energy storage. In the design procedure of the converter, existence of a common ground between the load and input ports, high voltage gain and continuous current of the ports are introduced, which make the converter appropriate for more applications. The converter boosts voltage with high gain in all of its operation modes. In addition, it operates in unbalanced conditions such as different powers and voltage levels of the input sources. According to the used switching strategy, controlling input power of the sources and output voltage is possible. Furthermore, the converter switches between charging and discharging modes automatically. To validate the feasibility and effectiveness of the proposed MPC, a prototype with 250 W nominal power is prepared. The converter boosts 20–400 V in all of the experimented modes.

Journal ArticleDOI
TL;DR: In this article , the adaptive sliding-mode control of a high efficiency non-isolated buck-boost converter based on Zeta converter is presented, where the reference inductor current is first calculated using the estimated load conductance obtained from an adaptation algorithm.
Abstract: The adaptive sliding-mode control of a high efficiency non-isolated buck-boost converter based on Zeta converter is presented. The converter has a dc gain higher than that of the Zeta converter and is a sixth-order system. The controller uses the inductor current error and a proportional term to generate the control action. The reference inductor current is first calculated using the estimated load conductance obtained from an adaptation algorithm. The proposed and existing sliding-mode controllers are closely related under certain conditions. The stability analysis of the closed-loop system is performed and sheds light on the controller’s effectiveness. Experimental results are given to validate the theory.

Journal ArticleDOI
TL;DR: In this paper , an interleaved buck-boost converter with reduced power electronics devices count in comparison with the conventional topology is introduced, where the buck switch is gated only if any of the boost switches are gated.
Abstract: This paper introduces an interleaved buck-boost converter with reduced power electronics devices count in comparison with the conventional topology. The proposed converter consists of a single buck converter followed by $n$ parallel interleaved boost converters. The buck switch is gated only if any of the boost switches is gated. In addition to the reduced switches count, the proposed converter offers the following advantages, soft start-up and shutdown capabilities. In addition, the buck stage gives the ability to protect the power electronic devices and to isolate the supply during load failure or overload. Moreover, the proposed converter performs as an interleaved boost converter for high voltage gain requirements with the same switching scheme. Furthermore, it offers fast dynamic performance with smooth transition from the buck mode to the boost mode. This paper investigates the eight different operating zones of the proposed three-phase interleaved buck-boost converter for non-overlapping gate signals operation. The detailed analysis and zones of operation are presented and experimentally validated. In addition, a simple control system is presented to operate the proposed converter as dc-dc converter or ac-dc converter. More study cases are carried out to evaluate the different capabilities of the proposed converter.

Journal ArticleDOI
08 Feb 2022-Energies
TL;DR: In this paper , a DC-DC converter with an innovative topology for automotive applications is proposed, which can behave either in stepdown or in step-up mode, presenting in both cases a high gain between the input and output voltage.
Abstract: In this paper, a DC-DC converter with an innovative topology for automotive applications is proposed. The goal of the presented power converter is the electrical storage system management of an electric vehicle (EV). The presented converter is specifically compliant with a 400 V battery, which represents the high-voltage primary source of the system. This topology is also able to act as a bidirectional power converter, so that in this case, the output section is an active stage, which is able to provide power as, for example, in the case of a low-voltage battery or a supercapacitor. The proposed topology can behave either in step-down or in step-up mode, presenting in both cases a high gain between the input and output voltage. Simulation results concerning the proposed converter, demonstrating the early feasibility of the system, were obtained in a PowerSIM environment and are described in this paper.

Journal ArticleDOI
TL;DR: In this article , a robust RST digital feedback controller is proposed to overcome the instability issues caused by the negative-resistance effect of CPLs and to improve robustness against the perturbations of power load and input voltage fluctuations, as well as to achieve a good tracking performance.
Abstract: The instability of DC microgrids is the most prominent problem that limits the expansion of their use, and one of the most important causes of instability is constant power load CPLs. In this paper, a robust RST digital feedback controller is proposed to overcome the instability issues caused by the negative-resistance effect of CPLs and to improve robustness against the perturbations of power load and input voltage fluctuations, as well as to achieve a good tracking performance. To develop the proposed controller, it is necessary to first identify the dynamic model of the DC/DC buck converter with CPL. Second, based on the pole placement and sensitivity function shaping technique, a controller is designed and applied to the buck converter system. Then, validation of the proposed controller using Matlab/Simulink was achieved. Finally, the experimental validation of the RST controller was performed on a DC/DC buck converter with CPL using a real-time Hardware-in-the-loop (HIL). The OPAL-RT OP4510 RCP/HIL and dSPACE DS1104 controller board are used to model the DC/DC buck converter and to implement the suggested RST controller, respectively. The simulation and HIL experimental results indicate that the suggested RST controller has high efficiency.

Proceedings ArticleDOI
20 Mar 2022
TL;DR: In this article , a high voltage gain bidirectional DC-DC converter for the electrical vehicle (EV) application is proposed, which has a wide voltage gain range, low voltage stress on the power semiconductor devices, and a common ground between the ground of the input and output side.
Abstract: In this paper, a high voltage gain bidirectional DC-DC converter for the Electrical Vehicle (EV) application is proposed. The converter provides the merits of both switched-inductor and switched-capacitor converters. The proposed converter has a wide voltage gain range, low voltage stress on the power semiconductor devices, and a common ground between the grounds of the input and output side. Besides, synchronous rectification is adopted to obtain zero voltage switching (ZVS) during turn on and turn off dead time and thereby, efficiency of the converter is increased. The operating principle of the converter is provided in both step up and step-down mode and then, voltage gains of the converter are derived for two modes. Finally, a 96W converter with a constant high-voltage side (240V) and low-voltage side (18∼24V) has been built to demonstrate the experimental validation of our proposed design.

Journal ArticleDOI
TL;DR: In this paper , a voltage gain interleaved soft switched DC-DC Boost converter without auxiliary switch is proposed, and the converter efficiency is equal to 97.6% at nominal power.

Journal ArticleDOI
TL;DR: In this article , the authors considered a fuel cell interleaved Buck-Boost converter (FC-IBBC) topology with continuous input current and designed a nonlinear control law to enforce DC-bus voltage regulation and ensure adequate current sharing.
Abstract: 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.

Journal ArticleDOI
TL;DR: In this article , a multilevel cascade converter with H-bridge cells is proposed for fuel cell-powered light rail vehicles, which provides dc-ac power conversion with unique buck-boost capability to compensate for the variation of fuel cell terminal voltage with the load power.
Abstract: This article presents a ground breaking traction drive for fuel cell-powered light rail vehicles based on a multilevel cascade converter with H-bridge cells. The converter provides dc–ac power conversion with unique buck–boost capability to compensate for the variation of fuel cell terminal voltage with the load power. In comparison to a conventional boost inverter, based on the cascade connection of a boost dc–dc converter and a voltage source inverter, the proposed converter has the significant benefits of much smaller inductor size, lower dc side current ripple, and multilevel voltage waveforms at the ac output. This article presents the converter modeling and design of the boost inductor and submodule capacitors, taking into account the full speed range of the motor. The concept has been fully validated on a bespoke experimental prototype driving an induction motor, showing the suitability of the proposed converter as a traction drive for hydrogen-powered rail vehicles.

Journal ArticleDOI
TL;DR: In this article , the authors presented a novel high gain bidirectional switched Z-source DC-DC converter, which utilizes switched-capacitor concept with inductors for high voltage gain.
Abstract: The DC-DC converters are the essential modules in electric vehicles, grid interface of renewable energy sources and DC power supplies. This paper presents a novel high gain bidirectional switched Z-source DC-DC converter. The proposed bidirectional converter utilizes switched-capacitor concept with inductors for high voltage gain. The proposed bidirectional converter presents wide operating range of operation in both boost and buck mode of operation. The proposed converter has common ground between input and output, and uses only 5 active switches and 4 passive elements with reduce switch voltage stress. The current drawn from the low voltage side input source is continuous with reduced ripple. The operating principle, circuit analysis, design, mathematical model and closed loop operation of the proposed converter are presented. The proposed converter is verified through computer simulation and laboratory experiments. The simulation and experimental results are presented.

Journal ArticleDOI
TL;DR: In this paper , a comparison between four different DC-DC converters for solar power conversion is presented. And it is observed that the non-inverting buck-boost converter is the finest converter for solar energy conversion.
Abstract: This paper covers the comparison between four different DC-DC converters for solar power conversion. The four converters are buck converter, buck-boost converter, boost converter, and noninverting buck-boost converter. An MPPT algorithm is designed to calculate battery voltage, current of PV array, the voltage of PV array, power of PV array, output power. It is observed that the non-inverting buck-boost converter is the finest converter for solar power conversion. The final circuit design has the results of 12.2V battery voltage, 0.31A current of PV array, 34V voltage of PV array, 23mW power of PV panel, and 21.8mW of output power. The efficiency of this system is nearly 95%. All four circuits are simulated in MATLAB/Simulink R2020b.

Journal ArticleDOI
TL;DR: In this article , a zero-voltage switching (ZVS) full-bridge converter is proposed to overcome the disadvantages of traditional phase-shifted full-branch (PSFB) converter.
Abstract: In this article, a novel zero-voltage switching (ZVS) full-bridge converter is proposed to overcome the disadvantages of traditional phase-shifted full-bridge (PSFB) converter. In the proposed converter, a half-bridge (HB) converter with center-tap rectifier (CTR) is integrated into the traditional PSFB converter by sharing the lagging-leg switches and output filter. The HB converter operates with full duty cycle to ensure continuous energy transmission and the output voltage is regulated by adjusting the phase-shifted time of full-bridge (FB) converter. The proposed converter has many advantages such as reduced filter requirement, wide ZVS range and low primary circulating current. In addition, the rectifier in the proposed converter is composed of a full-bridge rectifier section and a CTR section. This feature makes the proposed converter well appropriate for the medium output voltage applications. Key operation principle and characteristics are fully discussed in this article. The effectiveness of proposed converter is verified using a 1.2 kW prototype circuit with 280 V input voltage and 60–120 V output voltage.

Journal ArticleDOI
TL;DR: In this paper , a novel zero voltage transition (ZVT) boost converter is proposed, and the overall efficiency of the converter is predicted with an artificial neural network (ANN) model.
Abstract: In this paper, a novel zero voltage transition (ZVT) boost converter is proposed, and the overall efficiency of the converter is predicted with an artificial neural network (ANN) model. In the proposed converter, the main switch is turned on by ZVT and turned off by zero voltage switching (ZVS). Also, the other semiconductor elements operate by soft switching (SS). Besides, the proposed snubber cell has the bidirectional direct power transfer feature. The theoretical analyzes of the converter are verified by an prototype having 50 VDC input voltage, 100 VDC output voltage, 250 W output power, and 100 kHz switching frequency. The overall efficiency of the converter in hard switching (HS) condition is increased from 87.2% to 95.4% thanks to proposed snubber cell. Moreover, the efficiency of converter at HS operation is estimated with ANN. For this estimation, 110 efficiency values are obtained based on the different switching frequency and the output power values. When the actual efficiency measurements and the estimation results obtained with the ANN model are compared, it is seen that the results overlap and is obtained very close result to the truth by ANN. Thus, owing to the ANN model, the semiconductor power elements will not need to be operated at high frequencies and overheating, and the damaging to the elements will be prevented. Finally, the efficiency curve measurement of the converter takes long time in the experimental study when it takes highly short time as a few minutes in the estimation with ANN.

Journal ArticleDOI
TL;DR: In this article , a two-stage bidirectional converter is proposed by combing a three-phase interleaved buck-boost converter with dual active bridge to reduce the voltage gain requirement along with ripple minimization.