Analysis of the Charging Characteristics of High Voltage Capacitor Chargers Considering the Transformer Stray Capacitance

Byungha Lee; Hanju Cha

Analysis of the Charging Characteristics of High Voltage Capacitor Chargers Considering the Transformer Stray Capacitance

Byungha Lee

Hanju Cha

Vol. 13, No. 3, pp. 329-338, May 2013

10.6113/JPE.2013.13.3.329

Capacitor charger

Series-parallel resonant converter

Transformer stray capacitance

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Abstract

In this paper, the charging characteristics of series resonant type high voltage capacitor chargers considering the transformer stray capacitance have been studied. The principles of operation for the four operational modes and the mode changes for the four different switching frequency sections are explained and analyzed in the range of switching frequency below the resonant frequency. It is confirmed that the average charging currents derived from the above analysis results have non-linear characteristics in each of the four modes. The resonant current, resonant voltage, charging current, and charging time of this capacitor charger as variations of the switching frequency, series parallel capacitance ratio (k=Cp/Cs), and output voltage are calculated. From the calculation results, the advantages and disadvantages arising from the parallel connection of this stray capacitance are described. Some methods to minimize charging time of this capacitor charger are suggested. In addition, the results of a comparative test using two transformers whose stray capacitances are different are described. A 1.8 kJ/s prototype capacitor charger is assembled with a TI28335 DSP controller and a 40 kJ, 7 kV capacitor. The analysis results are verified by the experiment.

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Cite this article

[IEEE Style]

B. Lee and H. Cha, "Analysis of the Charging Characteristics of High Voltage Capacitor Chargers Considering the Transformer Stray Capacitance," Journal of Power Electronics, vol. 13, no. 3, pp. 329-338, 2013. DOI: 10.6113/JPE.2013.13.3.329.

[ACM Style]

Byungha Lee and Hanju Cha. 2013. Analysis of the Charging Characteristics of High Voltage Capacitor Chargers Considering the Transformer Stray Capacitance. Journal of Power Electronics, 13, 3, (2013), 329-338. DOI: 10.6113/JPE.2013.13.3.329.