CUED Publications database

Series-connected IGBTs using active voltage control technique

Lim, TC and Williams, BW and Finney, SJ and Palmer, PR (2013) Series-connected IGBTs using active voltage control technique. IEEE Transactions on Power Electronics, 28. pp. 4083-4103. ISSN 0885-8993

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Abstract

With series insulated-gate bipolar transistor (IGBT) operation, well-matched gate drives will not ensure balanced dynamic voltage sharing between the switching devices. Rather, it is IGBT parasitic capacitances, mainly gate-to-collector capacitance Cgc, that dominate transient voltage sharing. As Cgc is collector voltage dependant and is significantly larger during the initial turn-off transition, it dominates IGBT dynamic voltage sharing. This paper presents an active control technique for series-connected IGBTs that allows their dynamic voltage transition dV\ce/dt to adaptively vary. Both switch ON and OFF transitions are controlled to follow a predefined dVce/dt. Switching losses associated with this technique are minimized by the adaptive dv /dt control technique incorporated into the design. A detailed description of the control circuits is presented in this paper. Experimental results with up to three series devices in a single-ended dc chopper circuit, operating at various low voltage and current levels, are used to illustrate the performance of the proposed technique. © 2012 IEEE.

Item Type: Article
Uncontrolled Keywords: Active voltage control (AVC) insulated-gate bipolar transistor (IGBT) series connection
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:22
Last Modified: 12 Dec 2014 19:04
DOI: 10.1109/TPEL.2012.2227812