Design procedure of an active bouncer for an ultra precise long pulse solid state modulator

Long pulse modulator systems like the electron-positron compact linear collider (CLIC) with a pulse length of 140μs require a bouncer for voltage drop compensation. In this paper, an active bouncer system, consisting of four bouncer modules, in series to the main capacitor bank, is investigated. The system's transfer function including the matrix pulse transformer is analysed and the output voltage ripple induced by the bouncer system is designed to be smaller than 5 ppm due to demanding repeatability requirement of CLIC. Based on a loss analysis is conducted resulting in a total bouncer system volume of 52dm3 and a reduction in the global efficiency (grid to klystron) of the modulator system of only 0.45%.

[1]  Nazar H. Malik,et al.  A review of the charge simulation method and its applications , 1989 .

[2]  J.W. Kolar,et al.  Output ripple reduction of an automotive multi-phase bi-directional dc-dc converter , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[3]  Davide Aguglia.  2 MW active bouncer converter design for long pulse klystron modulators , 2011, Proceedings of the 2011 14th European Conference on Power Electronics and Applications.

[4]  J. Biela,et al.  Optimal Transformer Design for an Ultra Precise Long Pulse Solid State Modulator , 2012 .

[5]  P. Viarouge,et al.  Klystron modulator technology challenges for the Compact Linear Collider (CLIC) , 2011, 2011 IEEE Pulsed Power Conference.

[6]  T. Kohama,et al.  Ripple Estimation for Paralleled Converter System with Automatic Interleaving Function , 2007, 2007 7th International Conference on Power Electronics and Drive Systems.

[7]  J. Biela,et al.  Novel 3 level bidirectional buck converter with wide operating range for Hardware-in-the-Loop test systems , 2012, 2012 15th International Power Electronics and Motion Control Conference (EPE/PEMC).

[8]  D. Aguglia,et al.  Pulse-to-pulse voltage reproducibility efficient prediction method for high precision klystron modulator design , 2012, 2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC).

[9]  J. W. Kolar,et al.  Design procedure for compact pulse transformers with rectangular pulse shape and fast rise times , 2010, 2010 IEEE International Power Modulator and High Voltage Conference.

[10]  Thomas Guillod,et al.  Gate Unit With Improved Short-Circuit Detection and Turn-Off Capability for 4.5-kV Press-Pack IGBTs Operated at 4-kA Pulse Current , 2013, IEEE Transactions on Plasma Science.

[11]  U. Drofenik,et al.  Sub-Optimum Design of a Forced Air Cooled Heat Sink for Simple Manufacturing , 2007, 2007 Power Conversion Conference - Nagoya.