Abstract The direct series connection of multiple insulated gate bipolar transistor (IGBT) is one of the effective approaches to realize high voltage power conversion, and the dynamic voltage sharing between series IGBT is the key to its safe and reliable operation. This article is based on the test and analysis of the series connected field stop IGBT (FS-IGBT). The relationship between the turn-off delay and the degree of voltage un-balance is found. A control strategy for dynamic voltage sharing is proposed, which is responsive to series IGBT characteristics and adjusts the delay time (or lead time) of the IGBT switches in real-time. The time adjustment is calculated by the two-section type regulation algorithm, i.e., the square proportion algorithm realizes regulation rapidity with larger voltage un-balance degree and the proportional algorithm achieves voltage stability with smaller voltage un-balance degree. The time adjustment of each IGBT is introduced into its next IGBT time adjustment to further optimize the regulation speed. The experimental results verify the feasibility and effectiveness of the proposed method.
Ding Shun,Xing Yan,Wang Jun等. Control for Dynamic Voltage-Sharing among Series-Connected IGBTs[J]. Transactions of China Electrotechnical Society, 2018, 33(14): 3194-3201.
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