High-Power High-Performance Low-Cost Capacitor Charger Concept and Implementation

Pokryvailo, A.; Carp, C.; Scapellati, C.

doi:10.1109/tps.2010.2051959

Cited by 25 publications

(10 citation statements)

References 8 publications

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“…where f s is switching frequency, C r is the capacitance of the of the resonant capacitors C1, C2 (C r =C1=C2 in Figure 2), and V r is the DC rail voltage (see [13], [14] (1) provides also an easy way of calculating C r . The inverters must generate a power that is equal or larger than the load power P load to be able to charge the output capacitance to a desired voltage and deliver P load in steadystate.…”

Section: Estimating Risetimementioning

confidence: 99%

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A 100 kW high voltage power supply for dual energy computer tomography applications

Pokryvailo¹,

Carp²,

Scapellati³

2015

IEEE Trans. Dielect. Electr. Insul.

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Dual energy X-ray computer tomography (CT) offers enhanced imaging and reduced radiation dose. A conventional technique is using two tubes, each energized by its high voltage power supply (HVPS) at different voltage levels. This approach is straightforward but costly. An alternative is using a single tube fed by an HVPS capable of generating these same voltages with fast transitions from one state to another. A conventional HVPS with exceptionally fast dynamics is less costly than a modulator employing a set of HV switches. Such an HVPS is described in this paper. Key technology includes an all-solid-state modular IGBT-based HV converter with energy-dosing inverters operating at up to 70 kHz. The inverters' output voltages are phase-shifted, which yields low ripple and fast risetime combined with low stored energy. Controls provide standard operating features and means of communicating with the outside world. Digital processing enables predictive control for generating clean transitions from one state to another in a wide range of load/line conditions. The HVPS incorporates also two filament power supplies and a high-speed starter. Results of extensive testing with both resistive loads and X-ray tubes are presented. The developed techniques can also be used in other applications requiring low-cost generation of high-power HV pulses submillisecond-to many seconds-long.Index Terms -Computer tomography, dual energy, X-ray, high voltage power supply, pulsed power, power modulator, energy dosing. MAIN DESIGN PARAMETERSA typical CT HVPS for medical applications has a peak power of about 100 kW, but average power of only 5 kW. Relatively low average power is an important factor of Manuscript Alex Pokryvailo (M'05-SM'07) was born in Vyborg, Russia. He received the M.Sc. and Ph.D. degrees in electrical engineering from the Leningrad Polytechnic Institute in 1975 and 1987, respectively. Formerly with Soreq NRC, Israel, now he is with Spellman High Voltage Electronics Corp., serving as Director of Research. His current and recent experience relates to design of HV high-power switch-mode power supplies, Pulsed Power, with emphasis on high-current opening and closing switches and magnetic design, fast diagnostics, and corona discharges. Previously, he studied switching arcs, designed SF6-insulated switchgear, made research in the area of interaction of flames with electromagnetic fields, etc. He has published over 120 papers, two textbooks (in Hebrew), and more than 20 patents pertaining to HV technology.Costel Carp (M'05) was born in Romania. He earned his BTek degree from Polytechnic Institute Iasi, Romania, in 1986, and has been with Spellman High Voltage Electronics Corporation since 2002. His main field of expertise is power electronics, with emphasis on high voltage, high-power supplies for industrial and medical applications.Cliff Scapellati (M'92), photograph and biography not available at the time of publication.

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Section: Estimating Risetimementioning

confidence: 99%

“…The principle and theory of operation, design methods, benefits and shortcomings, etc., of HB ED inverters were documented elsewhere (see [10], [13], [14] and their references). …”

Section: Introductionmentioning

confidence: 99%

A 100 kW high voltage power supply for dual energy computer tomography applications

Pokryvailo¹,

Carp²,

Scapellati³

2015

IEEE Trans. Dielect. Electr. Insul.

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“…There are several parameters that influences the charging system [3]. Among them, the Pulseto-Pulse Repeatability (P P R) is one of the most important since it defines the variation in the final charging voltage.…”

Section: Capacitor Charging Systemsmentioning

confidence: 99%

“…Furthermore, the output voltage grows linearly and the output power is a linear function of time [3]. The main equations of this converter are:…”

Section: Full-bridge Phase-shifted Convertermentioning

confidence: 99%

“…In this kind of systems, the capacitor charging system plays an essential role, since it has to transfer from the grid to the capacitive bank the energy that has to be further delivered to the load. The capacitor charging system has to exhibit several features, among others pulse-to-pulse repeatibility, compactness, efficiency and robustness [2,3]. There are many topologies suitable for capacitor charging systems, each one having advantages and disadvantages [4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of topologies suitable for capacitor charging systems

Maestri

Retegui

Uicich

et al. 2013

2013 15th European Conference on Power Electronics and Applications (EPE)

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This paper presents a comparison between topologies suitable for capacitor charging systems. The topologies under evaluation are a yback converter, a half-bridge series resonant converter and a full-bridge phase-shifted converter. The main features of these topologies are highlighted, which allows the proper topology selection according to the application requirements. Moreover, the performed analysis permits to characterize the operational range of the main components thus allowing their appropriate sizing and selection. Simulation results are provided.

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Analysis and design of an isolated high step‐up converter based on the secondary side quasi‐resonant loops

Jia

Yuan

2020

IET Power Electronics

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In a high step-up converter, the primary side input current contributes a significant share of total power loss. Meanwhile, high-voltage stresses of secondary side components are also big issues. This study proposes an isolated converter with secondary side quasi-resonant loops. The push-pull structure is adopted to reduce active switch numbers so the primary side power loss can be controlled in a very minor range. The newly added resonant loops on the secondary side significantly decrease the current stresses of the resonant capacitors, so the power loss caused by capacitor equivalent-series-resistance is reduced. The voltage stresses of diodes and capacitors on the secondary side are also decreased by an improved symmetricalvoltage-quadrupler-rectifier structure. The proposed converter is with the maximum voltage gain equal to 4 without consideration of the transformer. Therefore, it is helpful to decrease the transformer turns ratio. The operation process is analysed in detail and the design considerations are also summarised. Theoretical analysis is verified by the experimental results of a 400 W prototype with 34-40 V input and 380 V output.

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High-Power High-Performance Low-Cost Capacitor Charger Concept and Implementation

Cited by 25 publications

References 8 publications

A 100 kW high voltage power supply for dual energy computer tomography applications

A 100 kW high voltage power supply for dual energy computer tomography applications

Comparison of topologies suitable for capacitor charging systems

Analysis and design of an isolated high step‐up converter based on the secondary side quasi‐resonant loops

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