A Soft-Switched DC/DC Converter Using Integrated Dual Half-Bridge with High Voltage Gain and Low Voltage Stress for DC Microgrid Applications

Moradisizkoohi, Hadi; Elsayad, Nour; Mohammed, Osama A.

doi:10.3390/inventions3030063

Cited by 8 publications

(3 citation statements)

References 31 publications

(42 reference statements)

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“…For MG applications, Moradisizkoohi et al [81] built a 15-30/400-V, 1-kW, 100-kHz soft-switched converter based on an integrated dual half-bridge which enabled high voltage gain. In the proposed design, a voltage multiplier stage was used to further increase the voltage gain, and clamp circuits were also used to achieve soft switching.…”

Section: Isolated Dc-dc Convertersmentioning

confidence: 99%

Review of GaN HEMT Applications in Power Converters over 500 W

2019

Electronics

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Because of the global trends of energy demand increase and decarbonization, developing green energy sources and increasing energy conversion efficiency are recently two of the most urgent topics in energy fields. The requirements for power level and performance of converter systems are continuously growing for the fast development of modern technologies such as the Internet of things (IoT) and Industry 4.0. In this regard, power switching devices based on wide-bandgap (WBG) materials such as silicon carbide (SiC) and gallium nitride (GaN) are fast maturing and expected to greatly benefit power converters with complex switching schemes. In low- and medium-voltage applications, GaN-based high-electron-mobility transistors (HEMTs) are superior to conventional silicon (Si)-based devices in terms of switching frequency, power rating, thermal capability, and efficiency, which are crucial factors to enhance the performance of advanced power converters. Previously published review papers on GaN HEMT technology mainly focused on fabrication, device characteristics, and general applications. To realize the future development trend and potential of applying GaN technology in various converter designs, this paper reviews a total of 162 research papers focusing on GaN HEMT applications in mid- to high-power (over 500 W) converters. Different types of converters including direct current (DC)–DC, alternating current (AC)–DC, and DC–AC conversions with various configurations, switching frequencies, power densities, and system efficiencies are reviewed.

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Section: Isolated Dc-dc Convertersmentioning

confidence: 99%

Review of GaN HEMT Applications in Power Converters over 500 W

2019

Electronics

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“…The high gain nonisolated DC-DC circuits which are used in the implementation of converter circuits are studied [20][21][22][23]. Previous works have used soft-switching coupled inductors [24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Novel Soft-Switching Integrated Boost DC-DC Converter for PV Power System

Sayed

Gronfula²,

Ziedan

2020

Energies

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This paper presents a novel soft-switching boost DC-DC converter, which uses an edge-resonant switch capacitor based on the pulse width modulation PWM technique. These converters have high gain voltage due to coupled inductors, which work as a transformer, while the boost converter works as a resonant inductor. Upon turning on, the studied soft switching circuit works at zero-current soft switching (ZCS), and upon turning off, it works at zero-voltage soft switching (ZVS) while using active semiconductor switches. High efficiency and low losses are obtained while using soft switching and auxiliary edge resonance to get a high step-up voltage ratio. A prototype model is implemented in the Power Electronics Laboratory, Assiut University, Egypt. Seventy-two-panel PV modules of 250 W each were used to simulate and execute the setup to examine the proposed boost converter.Energies 2020, 13, 749 2 of 17 achieved by adding an auxiliary circuit, as shown in Figure 1a, instead of a classical hard-switched converter [6]. Moreover, the auxiliary circuit has no additional complexity or cost.To reduce the weight and size, a higher switching frequency operation, i.e., in the range of more than 50 kHz, is utilized [7]. In traditional switching converters, the exemplary switching frequency is between 5 kHz and 20 kHz. The switching frequency generally cannot be increased because this results in increasing switching losses and stresses on semiconductor devices. A high frequency is utilized to reduce the volume and weight of passive devices. The dynamic performance is better in the case of higher frequencies. High-frequency switching speeds up the converter response time and reduces the output filter volume, cost, and size. A high switching frequency is desirable for the minimum output inductor size and maximum control loop bandwidth. Overall system size will be reduced due to the operation of switches at a high frequency, which will make the new converters more feasible.To overcome these problems, soft-switching schemes such as zero-voltage soft switching (ZVS) type or zero-current soft switching (ZCS) commutation should be utilized to reduce switching losses and the semiconductor device stresses. For power converters in a distributed PV system, a soft-switching technique is proposed [8][9][10][11][12]. The presented converter (see Figure 1b) has advantages of improved efficiency at a higher switching frequency, low leakage current, wide load range, reduced weight and size, and a maximum total efficiency of 97.1% at a switching frequency of 100 kHz.The problems of excessive electromagnetic interference EMI and low efficiency can be solved by using zero-voltage-transition (ZVT) converters by limiting the turning-off di/dt in the output-side rectifier. Various types of ZVT converters have been presented before [9,13], but these converters suffer from several drawbacks, such as the following.

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“…In reference [4], the Single Inductor Dual Output (SIDO) boost converter with discrete pulse width modulation is proposed which occupies lesser area and operates at higher efficiency only when the system works for low power applications. In reference [5], to increase the voltage gain, two half bridge converters are formed in series manner with clamp circuit such that the soft switching is obtained with reduced stress on switches. Modelling of SIMO dc-dc converters in particular for two outputs is done in [6] and most of the researchers have used this model only to design the controllers for SIDO Buck converter [7].…”

Section: Introductionmentioning

confidence: 99%

Cross Regulation Reduced Optimal Multivariable Controller Design for Single Inductor DC-DC Converters

2019

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Single Inductor (SI) converters with the advantage of using one inductor for any number of inputs/outputs find wide applications in portable electronic gadgets and electrical vehicles. SI converters can be used in Single Input Multiple Output (SIMO) and Multiple Input Multiple Output (MIMO) configurations but they need controllers to achieve good transient and steady state responses, to improve the stability against load and line disturbances and to reduce cross regulation. Cross regulation is the change in an output voltage due to change in the load current at another output and it is an added constraint in SI converters. In this paper, Single Input Dual Output (SIDO) and Dual Input Dual Output (DIDO) converters with applications capable of handling high load current working in Continuous Conduction Mode (CCM) of operation are taken under study. Conventional multivariable PID and optimal Linear Quadratic Regulator (LQR) controllers are developed and their performances are compared for the above configurations to meet the desired objectives. Generalized mathematical models for SIMO and MIMO are developed and a Genetic Algorithm (GA) is used to find the parameters of a multivariable PID controller and the weighting matrices of optimal LQR where the objective function includes cross regulation as a constraint. The simulated responses reveal that LQR controller performs well for both the systems over multivariable PID controller and they are validated by hardware prototype model with the help of DT9834® Data Acquisition Module (DAQ). The methodologies used here generate a fresh dimension for the case of such converters in practical applications.

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A Soft-Switched DC/DC Converter Using Integrated Dual Half-Bridge with High Voltage Gain and Low Voltage Stress for DC Microgrid Applications

Cited by 8 publications

References 31 publications

Review of GaN HEMT Applications in Power Converters over 500 W

Review of GaN HEMT Applications in Power Converters over 500 W

Novel Soft-Switching Integrated Boost DC-DC Converter for PV Power System

Cross Regulation Reduced Optimal Multivariable Controller Design for Single Inductor DC-DC Converters

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