High Step-Up Active-Clamp Converter With Input-Current Doubler and Output-Voltage Doubler for Fuel Cell Power Systems

Kwon, Jung-Min; Kwon, Bong-Hwan

doi:10.1109/tpel.2008.2006268

Cited by 213 publications

(8 citation statements)

References 19 publications

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“…The applied HVAC transformer is 220 V input and 60 kV output, and the diode is for rectifying the AC voltage. It is combined with a diode and a capacitor to the voltage doubler [30]. Capacitors and diodes were used that could withstand a HVDC voltage of 100 kV or higher, and a limited resistor of 120 kΩ was also configured to protect the circuit from overvoltage and overcurrent when the test sample was breakdown.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Electrical Performance and Life Estimation of PPs for HVDC Power Cable

et al. 2021

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Demand and need for the application of high voltage direct current (HVDC) are increasing because of high capacity and long-distance transmission. Research on polypropylene (PP) that can increase the operation temperature compared to existing insulation is constantly being considered. This study aimed to evaluate the electrical performance and estimate the life of HVDC application of PP. In this study, a DC V-t characteristic tests were conducted on three types of PP sheets at a temperature of 110 °C. In addition, a life estimation formula based on the electrical stress was derived and the electrical performances were evaluated. The experimental results show that the life exponent of material mixed with block copolymer, homo polymer and high density polyethylene (HDPE) was 23 and the electrical performance was 17% better than block copolymer, thereby demonstrating the reliability and electrical performance for application of HVDC.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Electrical Performance and Life Estimation of PPs for HVDC Power Cable

et al. 2021

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“…As a result, substantial losses will be associated with the clamp circuit. 10 It should be noted that these configurations are complex in nature, and the gain factor of coupled inductors depends on their coupling coefficients. It is also possible to build cascaded or quadratic boost converter structures; However, the voltage at which the switch operates is the same as the load voltage, so high-voltage switching devices are required.…”

Section: Introductionmentioning

confidence: 99%

Design analysis and control of step‐up converter with reduced switch stress

Jagtap

Pattnaik

2023

Circuit Theory & Apps

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SummaryIn light of the increasing share of renewable energy sources (RES) in electricity generation, the research community is directing their attention toward developing highly efficient DC‐DC high‐gain step‐up converters. These converters are designed to exhibit reduced voltage stress on the switching devices (semiconductors). This paper presents a comprehensive study of a switch voltage stress‐reduced step‐up converter that offers a range of additional features, including the availability of a common ground point, continuous input current, simple two‐mode continuous conduction mode (CCM) operation, wide duty cycle range, and quadratic boosting factor. To achieve the aforementioned features, the converter utilizes two switches with the same operating modes, eliminating the need for complex switching circuitry. Operational modes, steady‐state analysis, and design considerations have been presented in detail. Comparative analysis indicates that the voltage conversion ratio per number of devices in the proposed topology is significantly higher than that of similar topologies. In addition, the voltage stress of switches is considerably less than the topologies addressed in the literature. The study further includes detailed mathematical and experimental analyses, small signal analysis, and hardware implementation to support the theoretical findings. The converter's efficiency has been thoroughly analyzed along with thermal analysis to ensure its reliability.

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“…As a result, it will generate an extra switching loss. To avoid this problem, an active clamp circuit can be added into the flyback converter to recover leakage inductor energy [14][15][16][17], as shown in Figure 4. In order to simply circuit topology, switches of the charger and discharger can be respectively integrated, as shown in Figure 5.…”

Section: Introductionmentioning

confidence: 99%

Buck-Boost/Flyback Hybrid Converter for Solar Power System Applications

Tseng

Fan

2021

Electronics

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This paper proposes a hybrid converter to supply power from solar power source to load. Since power is generated by solar power, which depends on the intensity of solar power, the power generated by the solar power does not keep at a constant power. Therefore, the proposed system needs a battery to balance power between solar power and load. When the proposed one uses the battery to balance powers, the proposed circuit requires a charger and discharger. To simplify the proposed converter, a buck-boost converter and flyback converter can be combined to implement the battery charging and discharging functions. With this approach, the proposed converter can be operated with zero-voltage switching (ZVS) at turn-on transition to reduce switching loss of switch when the proposed one is operated in the discharging mode. In addition, the proposed hybrid converter has several merits, which are less component counts, lighter weight, smaller size and higher conversion efficiency. As compared with the conventional counterparts with hard-switching circuit, the proposed one can increase conversion efficiency of 4% and achieve efficiency of 85% under full load condition when the proposed one is operated in the discharging mode. Experimental results which are obtained from a prototype with output voltage of 10 V and maximum output power 20 W have been implemented to verify its feasibility. It is suitable for an electronic sign indicating LED within 200 W, which is used in the night time.

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High Step-Up Active-Clamp Converter With Input-Current Doubler and Output-Voltage Doubler for Fuel Cell Power Systems

Cited by 213 publications

References 19 publications

Evaluation of Electrical Performance and Life Estimation of PPs for HVDC Power Cable

Evaluation of Electrical Performance and Life Estimation of PPs for HVDC Power Cable

Design analysis and control of step‐up converter with reduced switch stress

Buck-Boost/Flyback Hybrid Converter for Solar Power System Applications

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