A High Gain Transformer-Less DC-DC Converter for Fuel-Cell Applications

Palma, L.; Todorovic, Maja Harfman; Enjeti, P.N.

doi:10.1109/pesc.2005.1581986

Cited by 38 publications

(16 citation statements)

References 9 publications

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“…11(d) reveals that V c 1 and V c 2 are able to satisfy (2) and (5). In addition, output voltage V o is consistent with (10). Fig.…”

Section: Design and Experiments Of The Proposed Convertersupporting

confidence: 71%

“…From (10) and (29), the boundary normalized magnetizing-inductor time constant τ Lm B can be derived as The curve of τ Lm B is plotted in Fig. 10.…”

Section: Boundary Operating Condition Between Ccm and Dcmmentioning

confidence: 99%

“…PV sources can also connect in series to obtain sufficient dc voltage for generating ac utility voltage; however, it is difficult to realize a series connection of the PV source without incurring a shadow effect [8], [9]. High step-up dc-dc converters are generally used as the frontend converters to step from low voltage (12-40 V) up to high voltage (380-400 V) [10]. High step-up dc-dc converters are required to have a large conversion ratio, high efficiency, and small volume [11]- [16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel High Step-Up DC–DC Converter for a Microgrid System

Hsieh

Chen

Liang

et al. 2011

IEEE Trans. Power Electron.

245

114

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A novel high step-up dc-dc converter for a distributed generation system is proposed in this paper. The concept is composed of two capacitors, two diodes, and one coupled inductor. Two capacitors are charged in parallel, and are discharged in series by the coupled inductor. Thus, high step-up voltage gain can be achieved with an appropriate duty ratio. The voltage stresses on the main switch and output diode are reduced by a passive clamp circuit. Therefore, low resistance R D S (O N ) for the main switch can be adopted to reduce conduction loss. In addition, the reverserecovery problem of the diode is alleviated, and thus, the efficiency can be further improved. The operating principle and steady-state analyses of the voltage gain are also discussed in detail. Finally, a 24-V input voltage, 400-V output voltage, and 400-W output power prototype circuit of the proposed converter are implemented in the laboratory to verify the performance.

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“…11(d) reveals that V c 1 and V c 2 are able to satisfy (2) and (5). In addition, output voltage V o is consistent with (10). Fig.…”

Section: Design and Experiments Of The Proposed Convertersupporting

confidence: 71%

“…From (10) and (29), the boundary normalized magnetizing-inductor time constant τ Lm B can be derived as The curve of τ Lm B is plotted in Fig. 10.…”

Section: Boundary Operating Condition Between Ccm and Dcmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel High Step-Up DC–DC Converter for a Microgrid System

Hsieh

Chen

Liang

et al. 2011

IEEE Trans. Power Electron.

245

114

View full text Add to dashboard Cite

show abstract

“…This similar concept has been proposed in [120]- [122]. One might suppose that this power converter can For ground isolation and high voltage step-up ratio (but more complicated), interleaved boost/flyback [123], [124], push-pull [125]- [127], and half bridge and full bridge [128]- [132] can be considered as candidate topologies for the FC converter.…”

Section: Fuel Cell Currentmentioning

confidence: 99%

Fuel cell high-power applications

Thounthong

Davat

Raël

et al. 2009

EEE Ind. Electron. Mag.

138

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“…While the existing DC-DC converter topologies (see, e.g. [2,3]) have a large number of elements and transformers [3], complicated control system, etc., which raise the costs of energy produced by the system and its reliability, the new topology has a smaller number of elements and no transformers. The circuit constructed in the proposed way has simpler design, lower cost, no additional losses caused by the non-rated modes of transformer, no changes in the polarity direction, etc..…”

Section: Introductionmentioning

confidence: 99%

Performance of a Voltage Step-Up/Step-Down Transformerless DC/DC Converter: Analytical Model

Suskis¹,

Raņķis²

2012

Latvian Journal of Physics and Technical Sciences

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The authors present an analytical model for a voltage step-up/step-down DC/DC converter without transformers. The proposed topology is a combination of classic buck and boost converters in one single circuit but with differing operational principles. The converter is developed for a wind power autonomous supply system equipped with a hydrogen electrolytic tank and a fuel cell for energy stabilization. The main power source of the hydrogen-based autonomous supply system is energized by a synchronous generator operating on permanent magnets and equipped with a diode bridge. The input voltage of the converter in this case varies in the range 0-700 V, while its output DC voltage must be 540 V according to the demand of other parts of the system. To maintain the rated voltage, a special electrical load regulation is introduced. The calculations of the converter, the generator (equipped with a diode bridge) as element of the power system supply joint, and the load replaced by resistance are verified with PSIM software. NOMENCLATURE U 1 -the voltage across the terminals of generator; U ld -the voltage of load; E -the EMF of the generator; n -the speed of rotor in rpm; I d -the current at the output of diode bridge; m 2 -the number of pulsations; X L -the resistance caused by inductive impedance of the generator`s windings; k 1 -a coefficient showing relationship between EMF and rpm; k 2 -a coefficient showing voltage drop caused by the inductivity of stator windings according to the stator current frequency and equivalent resistance of DC voltage source; i 2 -the instantaneous value of the inductor L2 current; I 2max -the maximum value of current i 2 during a duty cycle; D 1 -the duty ratio of TR1 for the step-down mode; D 1b -the duty ratio of TR1 for the step-down mode in the boundary case; D 2 -the duty ratio of TR2 for the step-up mode; D 2b -the duty ratio of TR2 for step-up mode in the boundary case; R -the resistance of load; 30 f -the switching frequency of the converter; L 1 -the inductance of inductor L1; L 2 -the inductance of inductor L2.

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A High Gain Transformer-Less DC-DC Converter for Fuel-Cell Applications

Cited by 38 publications

References 9 publications

A Novel High Step-Up DC–DC Converter for a Microgrid System

A Novel High Step-Up DC–DC Converter for a Microgrid System

Fuel cell high-power applications

Performance of a Voltage Step-Up/Step-Down Transformerless DC/DC Converter: Analytical Model

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