A proportional base driver circuit for SiC bipolar junction transistors is presented. A current transformer feeds a proportion of the transistor's collector current into its base. The influence of the current transformer's magnetising current on its output current is addressed, as are minimum reset time restrictions. The circuit applies a negative off-state baseemitter voltage. Combining this and a regenerative proportional base drive current does not incur undue complexity or cost. The circuit is evaluated in a buck converter supplied from a 600V rail, switching at 50kHz and at a duty factor of 85%, and outputting 2.52kW.
|Title of host publication||8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)|
|Publisher||Institution of Engineering and Technology (IET)|
|Number of pages||6|
|Publication status||Published - 20 Apr 2016|