Overshoot problem of the output diode used in the pre-charger for the railway propulsion system
2012 (English)In: IET Power Electronics, ISSN 1755-4543, Vol. 5, no 7, 991-997 p.Article in journal (Refereed) Published
Pre-charger is a specific DC-DC converter application in the railway propulsion system. This study demonstrates the possible causes for output diode failures in the pre-charger. Overshoot voltage during diode reverse-recovery is a main reason for such failure. A test set-up is proposed to study the influence of reverse bias on the overshoot voltage. The method to mitigate the contact bounce in the control circuit, in the test set-up, is also introduced. The relationship between the overshoot and reverse bias is studied by means of applying different reverse biases. The parasitic capacitance and reverse-recovery characteristic of the diode is changed by the exceeding reverse bias. Reverse-recovery time is reduced when the reverse voltage is beyond a critical level. To overcome the overshoot problem, a snubber is applied, and experimentally verified. Overvoltage is dramatically reduced by applying this snubber. Current and voltage waveforms in different branches are recorded so as to give a better understanding of the working mechanism of the snubber.
Place, publisher, year, edition, pages
2012. Vol. 5, no 7, 991-997 p.
DC-DC converters, Diodes, Propulsion, Railroads, Recovery, Electromagnetic Compatibility
Telecommunications Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject SRA - Energy
IdentifiersURN: urn:nbn:se:kth:diva-96395DOI: 10.1049/iet-pel.2011.0495ISI: 000311026200008ScopusID: 2-s2.0-84867813697OAI: oai:DiVA.org:kth-96395DiVA: diva2:530603
QC 20150625. Updated from submitted to published.2012-06-042012-06-042015-06-25Bibliographically approved