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Series-Connected IGBTs Using Active Voltage Control Technique
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DOI：10.1109/TPEL.2012.2227812.png)
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Abstract
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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 C-gc, that dominate transient voltage sharing. As C-gc 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 IG-BTs that allows their dynamic voltage transition dV(ce)/dt to adaptively vary. Both switch ON and OFF transitions are controlled to follow a predefined dV(ce)/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.
Keywords:
Active voltage control (AVC)
insulated-gate bipolar transistor (IGBT)
series connection
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