Active damping filter for high bandwidth - Low ripple pulsed converters

IEEE Trans. Plasma Sci.

2014

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Abstract-This paper presents the design and experimental validations of a system of three new high-voltage (HV) pulsedpower converters for the H − sources. The system requires three pulsed voltages (50, 40, and 25 kV to ground) at 2-Hz repetition rate, for 700 µs of usable flat-top. The solution presents ripplefree output voltages and minimal stored energy to protect the ion source from the consequences of arc events. Experimental results on the final full-scale prototype are presented. In case of short-circuit events, the maximal energy delivered to the source is in the Joule range. HV flat-top stability of 1% is experimentally achieved with a simple Proportional-IntegralDerivative regulation and preliminary tuned H − source (e.g., radio frequency control, gas injection, and so forth). The system is running since more than a year with no power converter failures and damage to the source.

Section: Nomenclaturementioning

confidence: 99%

Section: Power Converter Topology Selectionmentioning

confidence: 99%

Interconnected High-Voltage Pulsed-Power Converters System Design for H⁻ Ion Sources

IEEE Trans. Plasma Sci.

2014

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“…The advantages are the possibility to operate the power converter in feedback loop, and to easily control the pulse length and the voltage level. Basically, a constant DC voltage is chopped by one or several switches and then smooth by a filter designed such that its bandwidth is a trade-off between the pulse rise time and the remaining output ripple [3]. When operating a switch mode power converter, one expects the driving switch command to be nicely followed by the switch itself.…”

Section: Source Of Non-repeatability In Switch Mode Power Convertermentioning

confidence: 99%

Solid-state power converter repeatability analysis

Gobbo

2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)

2015

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This paper presents a method for evaluating power converter repeatability. The focus is on solid-state switch mode power converter for which the most problematic non-repeatability sources are the jitter of the drivers and of the switches leading to output voltage pulses bad repeatability. Both driver and switch turn-on and turn-off delay dispersion have been measured. These measurements confirm that the delay is Gaussian distributed and that the repeatability prediction method is valid.

“…A constant DC voltage V in is chopped by one or several controlled switches operating either in their "on" (conducting) or "off" (non-conducting) states at medium frequencies (typically 10kHz to 500kHz, depending on the modulator topology). The output voltage is obtained using power filters, which design must consider the trade-off between residual output ripple and bandwidth to produce a pulsed voltage [3].…”

Section: Source Of Non-repeatability In Modern Klystron Modulatorsmentioning

confidence: 99%

Global design analysis for highly repeatable solid-state klystron modulators

Gobbo

2014 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

2014

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This paper presents an analysis of the repeatability issue in the electrical-to-radio frequency conversion chains using pulsed klystrons. The focus is on the power electronics used in klystron modulators. Repeatability definition is presented and simulation results allow deriving important conclusions regarding the voltage repeatability harmonic content versus power electronics design directions. The trade-off between klystron modulator and low level RF controls is a key point for optimizing the global system repeatability performance. ABSTRACTThis paper presents an analysis of the repeatability issue in the electrical-to-radio frequency conversion chains using pulsed klystrons. The focus is on the power electronics used in klystron modulators. Repeatability definition is presented and simulation results allow deriving important conclusions regarding the voltage repeatability harmonic content versus power electronics design directions. The trade-off between klystron modulator and low level RF controls is a key point for optimizing the global system repeatability performance.