Soft-switched high step-up DC-dc converter with voltage doubler
19 Jun 2014-pp 1-5
TL;DR: In this paper, the authors proposed an approach to obtain a high step-up voltage with zero voltage switching (ZVS) with an isolated type DC-DC converter, which used phase shift technique and voltage doubler on the output side.
Abstract: This paper proposes a approach to obtain a high step-up voltage with zero voltage switching (ZVS) with an isolated type DC-DC converter. The entire setup consists of a full bridge converter which utilised proposed phase shift technique and voltage doubler on the output side. The converter operated at 20kHz switching frequency which is high enough to improve the efficiency. Ferrite core transformer is used in place of ordinary air core transformer. Which is small in size with number of turns of the transformer is reduced and the overall power density is increased. The proposed doubler circuit consists of electrolytic capacitors, which are rated at 400V. This circuit results in cost savings of more than 50% in the price of the electrolytic filter capacitors. The circuits were simulated using PSIM software for an input voltage of 200V, an output of 800V obtained. And it is validated with the low power hardware model.
Citations
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01 Jan 2018
TL;DR: A split-phase control design is proposed to achieve the complete softcharging operation in a PSC with a lower number of components compared to other step-up switched-capacitor topologies and the current transient can be eliminated by applying the soft-charging technique.
Abstract: Switched-capacitor (SC) converters have gained more interest due to their high power density and appropriateness for small circuit integration. Building a SC DC-to-DC converter with only capacitors and switches is the main reason to seek a higher power density achievement. However, the SC converters suffer dominant losses related to their capacitors and switches. These losses can be determined and optimized by calculating the converter’s output impedance in its two asymptotic limits. We proposed a high voltage gain and a very low output impedance power switchedcapacitor converter (PSC) with a lower number of components compared to other step-up switched-capacitor topologies. The high output efficiency and the higher power density are two fundamental aspects of the PSC converter. We can eliminate the current transient by applying the soft-charging technique that results a higher power density and a higher efficiency in PSC. The soft-charging operation is more preferable to the soft-switching technique (resonant operation) since it does not require any auxiliary components. Furthermore, soft-charging helps to resize capacitors and reduce the switching frequency of the PSC converter. Furthermore, a split-phase control design is proposed to achieve the complete softcharging operation in a PSC. The control diagram was designed for a 1-to-4 PSC (two
2 citations
Cites background from "Soft-switched high step-up DC-dc co..."
...The DC-to-DC SC converters come in many topologies such as, series to parallel [6-10], Dickson [11, 12], Fibonacci [13], ladder [14], and Voltage Doubler [15-20] where some of those are presented in Figure 1....
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...The DC-to-DC SC converters come in many topologies such as, series to parallel [6-10], Dickson [11, 12], Fibonacci [13], ladder [14], and Voltage Doubler [15-20] where some of those are presented in Figure 1.1....
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15 Sep 2020
TL;DR: A high-reliability space high-voltage converter is proposed that takes the phase-shifted full bridge series resonance circuit to optimize the efficiency of the high- voltage converter and the optimization results and electric field of the experimental circuit board are simulated and verified.
Abstract: With the rapid development of world aerospace technology, next-generation technologies such as high-power electric propulsion, space welding and future space solar power stations have put forward higher requirements on the power level, reliability and conversion efficiency of space high-voltage power supplies. The key to space high-voltage power supply design is to improve the reliability and efficiency of the power supply. Aiming at this situation, this paper proposes a high-reliability space high-voltage converter. Based on the experiments, we take the phase-shifted full bridge series resonance circuit to optimize the efficiency of the high-voltage converter, the optimization results and electric field of the experimental circuit board are simulated and verified. Finally, the development direction of space high-voltage power supply is summarized and the outlook is put forward.
2 citations
Cites methods from "Soft-switched high step-up DC-dc co..."
...Operation mode analysis Based on the existing foundation [6-9], a preliminary design of the space high-voltage power module shown in Fig....
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...Based on the existing research foundations [6-9], this paper proposes a space boost converter topology with a high boost ratio, analyzes and proposes new improvement schemes after corresponding experiments, and performs simulation verification....
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References
More filters
TL;DR: In this article, a family of high-efficiency, high step-up DC-DC converters with simple topologies is proposed, which use diodes and coupled windings instead of active switches to realize functions similar to those of active clamps.
Abstract: Many applications call for high step-up DC-DC converters that do not require isolation. Some DC-DC converters can provide high step-up voltage gain, but with the penalty of either an extreme duty ratio or a large amount of circulating energy. DC-DC converters with coupled inductors can provide high voltage gain, but their efficiency is degraded by the losses associated with leakage inductors. Converters with active clamps recycle the leakage energy at the price of increasing topology complexity. A family of high-efficiency, high step-up DC-DC converters with simple topologies is proposed in this paper. The proposed converters, which use diodes and coupled windings instead of active switches to realize functions similar to those of active clamps, perform better than their active-clamp counterparts. High efficiency is achieved because the leakage energy is recycled and the output rectifier reverse-recovery problem is alleviated.
974 citations
TL;DR: In this paper, a switch-capacitor (SC) circuit is integrated within a boost converter for a steep step-up of the line voltage, allowing for a boost of the input voltage to high values.
Abstract: A new circuit is proposed for a steep step-up of the line voltage. It integrates a switched-capacitor (SC) circuit within a boost converter. An SC circuit can achieve any voltage ratio, allowing for a boost of the input voltage to high values. It is unregulated to allow for a very high efficiency. The boost stage has a regulation purpose. It can operate at a relatively low duty cycle, thus avoiding diode-reverse recovery problems. The new circuit is not a cascade interconnection of the two power stages; their operation is integrated. The simplicity and robustness of the solution, the possibility of getting higher voltage ratios than cascading boost converters, without using transformers with all their problems, and the good overall efficiency are the benefits of the proposed converter.
439 citations
01 Jan 2005
TL;DR: In this paper, a high boost converter with a voltage multiplier and a coupled inductor was proposed to boost low input voltage to high voltage output with low duty cycle, and the secondary voltage was rectified using voltage multiplier.
Abstract: With the increasing demand for renewable energy, distributed power included in fuel cells have been studied and developed as a future energy source. For this system, a power conversion circuit is necessary to interface the generated power to the utility. In many cases, a high step-up DC/DC converter is needed to boost low input voltage to high voltage output. Conventional methods using cascade DC/DC converters cause extra complexity and higher cost. The conventional topologies to get high output voltage use flyback DC/DC converters. They have the leakage components that cause stress and loss of energy that results in low efficiency. This paper presents a high boost converter with a voltage multiplier and a coupled inductor. The secondary voltage of the coupled inductor is rectified using a voltage multiplier. High boost voltage is obtained with low duty cycle. Theoretical analysis and experimental results verify the proposed solutions using a 300 W prototype.
262 citations
"Soft-switched high step-up DC-dc co..." refers background in this paper
...The conventional topologies to get high output voltage use flyback converters, they have the leakage components that cause stress and loss of energy that results in low efficiency [9]....
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TL;DR: In this article, a comprehensive optimization procedure based on analytical models for minimizing volume of DC-DC converter systems has been developed at the power electronic systems laboratory of the Swiss Federal Institute of Technology (ETH Zurich).
Abstract: The demand for decreasing costs and volume leads to a constantly increasing power density of industrial converter systems. In order to improve the power density, further different aspects, like thermal management and electromagnetic effects, must be considered in conjunction with the electrical design. Therefore, a comprehensive optimization procedure based on analytical models for minimizing volume of DC-DC converter systems has been developed at the power electronic systems laboratory of the Swiss Federal Institute of Technology (ETH Zurich). Based on this procedure, three converter topologies-a phase-shift converter with current doubler and with capacitive output filter and a series-parallel resonant converter-are optimized with respect to power density for a telecom supply (400 V/48 V). There, the characteristic of the power density, the efficiency, and the volume distribution between the components as functions of frequency are discussed. For the operating points with maximal power density, the loss distribution is also presented. Furthermore, the sensitivity of the optimum with respect to junction temperature, cooling, and core material is investigated. The highest power density is achieved by the series-parallel resonant converter. For a 5-kW supply, a density of approximately 12 kW/L and a switching frequency of ca. 130 kHz are obtained.
142 citations
01 Oct 2007
TL;DR: In this paper, a comprehensive optimization procedure based on analytical models for minimizing volume of DC-DC converter systems has been developed at the Power Electronic Systems Laboratory of the ETH Zurich, based on this procedure three converter topologies - a phase shift converter with current doubler and with capacitive output filter and a series-parallel resonant converter - are optimized with respect to power density for a telecom supply (400V/48V).
Abstract: The demand for decreasing costs and volume leads to a constantly increasing power density of industrial converter systems. In order to improve the power density further different aspects, like thermal management and electromagnetic effects must be considered in conjunction with the electrical design. Therefore, a comprehensive optimization procedure based on analytical models for minimizing volume of DC-DC converter systems has been developed at the Power Electronic Systems Laboratory of the ETH Zurich. Based on this procedure three converter topologies - a phase shift converter with current doubler and with capacitive output filter and a series-parallel resonant converter - are optimized with respect to power density for a telecom supply (400V/48V). There, the characteristic of the power density, the efficiency and the volume distribution between the components as function of frequency is discussed. For the operating points with maximal power density also the loss distribution is presented. Further more, the sensitivity of the optimum with respect to junction temperature, cooling and core material is investigated. The highest power density is achieved by the series-parallel resonant converter. For a 5 kW supply a density of approximately 12 kW/ltr. and a switching frequency of ca. 130 kHz results.
140 citations
"Soft-switched high step-up DC-dc co..." refers background in this paper
...In many applications power density is an important criterion [1-4]....
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...Earlier it has been proposed the voltage doubler plays and important factor on improving power density [1-2]....
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