A new zero voltage and zero current power-switching technique

Weinberg, A. H.; Ghislanzoni, L.

doi:10.1109/63.163645

Cited by 42 publications

(13 citation statements)

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“…Due to a short time period of t2-t3 or t6-t7, it is assumed that magnetizing current Im1 or Im2 keeps constant during this period. The energy stored in the magnetizing inductance Lm1 or Lm2 must be sufficient to cause a voltage swing across the switch equal to twice of the center tap voltage [11],…”

Section: Bmentioning

confidence: 99%

High Efficiency High Step-up Isolated DC-DC Converter for Photovoltaic Applications

Wang

Ouyang

et al. 2019

2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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A high efficiency and high step-up isolated DC-DC converter with a new topology configuration for photovoltaic (PV) application is proposed in this paper. This converter consists of a Zero-Voltage-Switching (ZVS) and Zero-Current-Switching (ZCS) current-fed push-pull converter as a DC transformer dealing with most of power and an active clamp flyback (ACF) converter as a regulator with considerable high efficiency within a large conversion range. The two converters are constructed with the input-parallel-output-series (IPOS) structure. The inputparallel connection is able to share the large input current as well as reduce the current ripple, while the output-series connection is used to increase the output voltage gain. A 400 V / 400 W experimental prototype with an input voltage range of 24 V -32 V is built. The maximum efficiency reaches at 95.1%. The experimental result validates the correctness of the analysis and proves the feasibility of the proposed topology for the photovoltaic applications.

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Section: Bmentioning

confidence: 99%

High Efficiency High Step-up Isolated DC-DC Converter for Photovoltaic Applications

Wang

Ouyang

et al. 2019

2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…The second stage is an isolated dc-dc converter with a resonant operation, generating the different high voltage outputs to supply the TWT [4]. In this case, the isolated dc-dc converter operates in at an optimized operation point, with a con-stant switching frequency and a fixed duty-ratio.…”

Section: And 4)mentioning

confidence: 99%

Isolated DC-DC converters with high-output voltage for TWTA telecommunication satellite applications

Barbi

Gules

2003

IEEE Trans. Power Electron.

134

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Two alternatives for the implementation of an isolated dc-dc converter operating with a high output voltage and supplied by an unregulated low input voltage are presented in this paper. The proposed topologies are especially qualified for the implementation of travelling wave tube amplifiers (TWTA) utilized in telecommunication satellite applications due to their low mass and volume and their high-efficiency. The converters studied follow different principles and the main operational aspects of each topology are analyzed. A two-stage structure composed by a regulator connected in series with a ZVS/ZCS isolated dc-dc converter is the first topology proposed. The second topology studied is an isolated single-stage converter that continues being highly efficient even with a large input voltage variation. The experimental results obtained from two prototypes, implemented following the design procedures developed, are presented, verifying experimentally the characteristics and the analysis of the proposed structures. The prototypes are developed for an application requiring an output power of 150 W, a total output voltage of 3.2 kV and an input voltage varying from 26 V to 44 V. The minimum efficiency obtained for both converters operating at the nominal output power, is equal to 93.4% for the two-stage structure and equal to 94.1% for the single-stage converter.

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“…However, the conventional push-pull converter operates at hard switching resulting in high switching losses and producing high-voltage spike across the devices, which leads to demanding high-voltage rating switches and the problem of EMI with the increase of switching frequency [7]. In order to release these drawbacks, many zerovoltage-switching (ZVS) or zero-current-switching push-pull topologies have been proposed in past decades [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], where their soft switching is mostly realised by using the series, parallel or series-parallel resonance between the added or inherent resonant inductors and parasitic capacitors.…”

Section: Introductionmentioning

confidence: 99%

“…In the past literature, several kinds of resonant push-pull converter have been presented in [8][9][10][11][12][13][14][15], which make use of the resonant tank to assist in ZVS or ZCS operation of primary switches. Although these converters can reduce the switching losses and achieve high efficiency, the output voltage in [8][9][10] cannot be regulated, and is just determined by the input voltage and transformer turns ratio. In order to achieve the regulation of output voltage, in [11,12], a buck converter in series with the push-pull structure has been proposed.…”

Section: Introductionmentioning

confidence: 99%

Magnetising‐current‐assisted wide ZVS range push–pull DC/DC converter with reduced circulating energy

Wang

2018

IET Power Electronics

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An improved high efficiency wide zero-voltage-switching (ZVS) range push-pull converter for low-voltage to highvoltage power conversion is proposed in this study. For this improved converter, all of primary switches are turned on with ZVS operation from full load to light load by using the energy stored in the leakage inductance aided by the magnetising inductance. The resonance between the leakage inductor and the voltage-doubler-rectifier capacitors reduces not only the voltage and current stresses of rectifier diodes but also the turns ratio of high-frequency transformer and conduction loss. In addition, the circulating energy is decreased dramatically compared with the similar converter resulting in lower conduction loss. This topology features simpler structure and higher efficiency. Detailed operational principle, design, comparative study and experimental results are fully discussed in the text. Finally, a 200 W experimental prototype has been built to verify the effectiveness of the proposed concept.

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A new zero voltage and zero current power-switching technique

Cited by 42 publications

References 1 publication

High Efficiency High Step-up Isolated DC-DC Converter for Photovoltaic Applications

High Efficiency High Step-up Isolated DC-DC Converter for Photovoltaic Applications

Isolated DC-DC converters with high-output voltage for TWTA telecommunication satellite applications

Magnetising‐current‐assisted wide ZVS range push–pull DC/DC converter with reduced circulating energy

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