High step‐up DC–DC converter with ripple free input current and soft switching

Mohammadi, Mohammad Reza; Taheri, M.; Milimonfared, Jafar; Arand, Bijan Abbasi; Behbahani, M. R. M.

doi:10.1049/iet-pel.2013.0881

Cited by 31 publications

(11 citation statements)

References 18 publications

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“…The voltage and current waveforms of the diodes D 4 and D 5 are shown in Figure 9B. From (27), the voltage stress of the diodes Figure 10A shows the voltage stress and current of the diodes D 1 and D 2 . From (24) and (25), the voltage across the diodes D 1 and D 2 are approximately 40 and 30 V, respectively, which are close to the experimental results.…”

Section: Resultsmentioning

confidence: 99%

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Single switch quadratic boost converter with continuous input current for high voltage applications

Mirzaee

Ansari

Moghani

2020

Circuit Theory & Apps

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Summary In this paper, a novel non‐isolated very high step‐up DC‐DC converter is presented. The introduced converter benefits from various advantages, namely, very high voltage gain, low voltage stress on the active switch, and continuous input current with low ripple. Therefore, the presented converter is suitable for renewable energy applications. In addition, the energy of the leakage inductance of the coupled inductor is successfully recovered, and the voltage spike of the active switch is clamped during the turn‐off process. Hence, a switch with low Rds−on can be used, which decreases the conduction losses as well as cost of the converter. Furthermore, the voltage stress of the output diode is decreased, which reduces the reverse recovery problem. The steady‐state analysis and design considerations of the proposed converter are discussed. Finally, the theoretical analysis is validated with the experimental results at an output power of 150 W.

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Section: Resultsmentioning

confidence: 99%

“…The power loss of each switch contains switching loss and conduction loss. The switching loss can be obtained as the following equation

P_{L o s s}^{s w i t c h i n g} = \frac{1}{2} V_{d s} false(\frac{I_{o n} t_{r} + I_{o f f} t_{o f f}}{2} false) f_{s} .

…”

Section: Efficiency Analysis and Comparisonmentioning

confidence: 99%

Single switch quadratic boost converter with continuous input current for high voltage applications

Mirzaee

Ansari

Moghani

2020

Circuit Theory & Apps

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“…Flight data recorded for the CMET during a flight in Mexico City [1] measured ambient relative humidities between 0-75%. An injection of water into the cathode inlet can be accounted for by adding the enthalpy input term, H w,in , H w,in =ṁ v,ca,in C p,lw (T ca,in − T o ) + h f g,Tca,in , (25) to the change in enthalpy in the cathode, ∆H w,ca from (19), whereṁ v,ca,in =ṁ a,ca,in M w φ ca,in p sat,Tca,in M a (p ca,in − φ ca,in p sat,Tca,in ,…”

Section: Parameter Identification Resultsmentioning

confidence: 99%

“…While the voltage needs of the CMET are greater than a single cell PEMFC stack can provide, parallel work is considering a step up DC/DC converter, as deployed by other authors in [23], [24], [25], to reduce stack mass. As a result, a single cell PEMFC stack is deployed here.…”

Section: A Experimental Hardwarementioning

confidence: 99%

Comparison of Two Models for Temperature Observation of Miniature PEM Fuel Cells Under Dry Conditions

McKahn

Liu

2015

IEEE Trans. Ind. Electron.

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Water and thermal management have been identified as technical hurdles to the successful implementation of low temperature, polymer electrolyte membrane (PEM), fuel cell power systems. In low power applications, miniature PEM fuel cells show significant promise as a competitor to lithium-ion batteries. Significant design work is underway to improve the specific power and energy densities of these fuel cells. However, little attention has been given to characterizing transient response in these miniature applications to enable gains in system design, optimization and control. This work develops, calibrates and experimentally validates two different dynamic control-oriented models for open-loop temperature state observation in miniature PEM fuel cells. Of critical importance, these estimators target operation under dry conditions with no reactant pre-treatment. Operational conditions are then identified for which each model architecture is more suitable, specifically targeting minimal model complexity. A sensitivity analysis was completed that indicates necessary sensor measurements with sensor frugality in mind. The dynamic response under changes in load and fuel stoichiometry are well captured over a range of operating conditions.

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“…By substituting Equations 12 and 18 in Equation 35, the relation of the main switch current in resonant interval can be achieved as follows. By substituting Equations 12 and 18 in Equation 35, the relation of the main switch current in resonant interval can be achieved as follows.…”

Section: Turn-on Time Of the Auxiliary Switchmentioning

confidence: 99%

Analysis and implementation of a new zero current switching flyback inverter

Ansari

Moghani

Mohammadi

2018

Circuit Theory & Apps

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In this paper, a novel zero current switching (ZCS) flyback inverter in discontinuous conduction mode (DCM) is proposed. In the proposed flyback inverter, the ZCS for the primary switch is achieved by adding a simple auxiliary circuit to the conventional flyback inverter. Also, the auxiliary switch is turned on and turned off at ZCS condition. Therefore, the switching losses of the switches are negligible, which increases the efficiency and allows higher switching frequency and more compact design. The resonant auxiliary cell is activated only in short transition times that makes its conduction losses negligible. Furthermore, the voltage overshoot of the main switch is limited during the turn-off process, which allows utilization of lower voltage metal-oxide semiconductor field-effect transistors (MOSFETs) with low conduction losses and low cost. The detailed operation of the flyback inverter with auxiliary circuit and design considerations are presented. Simulation and experimental results are presented to verify the performance of the proposed inverter.

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High step‐up DC–DC converter with ripple free input current and soft switching

Cited by 31 publications

References 18 publications

Single switch quadratic boost converter with continuous input current for high voltage applications

Single switch quadratic boost converter with continuous input current for high voltage applications

Comparison of Two Models for Temperature Observation of Miniature PEM Fuel Cells Under Dry Conditions

Analysis and implementation of a new zero current switching flyback inverter

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