基于门极放电补偿的串联IGBT有源驱动电路

doi:10.19595/j.cnki.1000-6753.tces.200714

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Abstract An active gate drive circuit for mitigating charge deviations among input capacitances of IGBTs during the turn-off transient is proposed in this paper to solve the problem of unbalanced voltage sharing among series-connected IGBTs. The circuit consists of a compensation providing current sink circuit, a closed-control and sampling circuit, and a triggering circuit that combines high-bandwidth analog parts with the relatively low-frequency control algorithm. Compared with other active gate drive circuits applied in series-connected IGBTs, the proposed circuit is only triggered by the falling-edge of the signal generated from the original gate drive IC, and does not introduce any additional power supply or signal isolation unit, which is easy to combine with commercial gate drive ICs. The frequency of sampling and control is consistent with the switching frequency of the IGBT, avoiding the use of expensive high-frequency control chips or AD/DA converters. Based on the analysis of the gate discharge deviations during the turn-off transient, the operational principle and design guideline for each module of the proposed driving circuit are specified. Experimental results verify the effectiveness and applicability of this driving scheme in voltage equalization control of series IGBTs.

Key words： Series-connected IGBT discharge compensation active gate drive voltage balancing

Received: 27 June 2020

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	Zhou Ye
	Wang Xu
	Xian Liang
	Yang Dan

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Zhou Ye,Wang Xu,Xian Liang等. Active Gate Drive with Discharge Compensation for Series-Connected IGBT[J]. Transactions of China Electrotechnical Society, 2021, 36(18): 3934-3945.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200714 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I18/3934

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