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Digital control of IGBTs for module shutdown in input-series and output-parallel connected modular DC-DC converter
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| Author(s) |
Yeh TING, Kewei HUANG, Braham FERREIRA |
| Abstract |
In an input-series and output-parallel (ISOP) connected modular DC-DC converter, the input voltagerange can be significantly increased by shutting down the respective modules. Additionally, theconverters efficiency at certain input voltage can be increased by utilising the most optimum numberof operating modules. The shutdown of non-essential modules is implemented with the availableIGBTs in the input bridge of the modules. Due to the large amount of energy stored in the input buscapacitors especially at high input voltages, the IGBTs have to be controlled to limit the initialdischarge current from the input capacitors. Digital control is hence employed here to accuratelycontrol the IGBTs in their active region during module shutdown to ensure operation within their safeoperation region. A complex programmable logic device (CPLD) is used here to generate the requiredgate voltage based on current and voltage feedback from the IGBTs. Upon completion of shutdown,the algorithm enables the IGBTs to fully turn on and operate in their saturation region to create a lowresistance current bypass path. The details of the digital control as well as its implementation arediscussed here. Results of the module shutdown and module reactivation with the implemented digitalcontrol are subsequently experimentally verified. |
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| Filename: | 0562-epe2014-full-11011553.pdf |
| Filesize: | 969 KB |
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| Type |
Members Only |
| Date |
Last modified 2015-06-08 by System |
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