Modelling and digital control of two-phase interleaved coupled-inductor non-isolated DC-DC converters

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dc.contributor.advisor Hayes, John G. en
dc.contributor.advisor Lightbody, Gordon en
dc.contributor.author Barry, Brendan C.
dc.date.accessioned 2018-01-29T09:57:01Z
dc.date.available 2018-01-29T09:57:01Z
dc.date.issued 2016
dc.date.submitted 2016
dc.identifier.citation Barry, B. C. 2016. Modelling and digital control of two-phase interleaved coupled-inductor non-isolated DC-DC converters. PhD Thesis, University College Cork. en
dc.identifier.endpage 217 en
dc.identifier.uri http://hdl.handle.net/10468/5338
dc.description.abstract This thesis focuses on the complete mathematical modelling and digital closed-loop control of two-phase interleaved coupled-inductor non-isolated dc-dc converters. Coupled-inductors have been shown to reduce the cost, size, and weight of high-power magnetic components while increasing efficiency. The complete large-signal model of the coupled-inductor boost converter is presented and compared to the traditional single-phase and two-phase discrete inductor dc-dc converters. The CCM-DCM mode maps are presented and discussed for the coupled-inductor boost converter. Sample analyses of several different CCM and DCM modes of operation are also presented. The different CCM and DCM waveforms are experimentally produced by a 1 kW laboratory prototype. Following on from the large-signal model, the complete small-signal model of the coupledinductor boost converter is presented. The method of solving for the small signal models is discussed, and sample analyses of several different CCM and DCM modes of operation are presented. Calculated and experimental frequency sweeps for several of the CCM and DCM modes of operation are produced and compared to verify the accuracy of the small-signal models. Controllers for the 1 kW prototype are designed from the transfer functions derived from the small-signal models. The control strategy of average-current-mode control is digitally implemented, which uses an outer voltage loop and an inner current loop to eliminate any error between the output and the desired output. The FPGA used in testing is the Altera Cyclone III FPGA. Initially, PI controllers are developed and compared to simulated results. In order to improve the closed-loop performance of the converter, the inner current loop PI controllers are replaced with Type II compensators. Several compensators are designed as examples for a number of CCM and DCM modes of operation. Finally, to increase the stability of the converter, bumpless PI control and forced-output control utilizing the Type II compensators are introduced and implemented. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2016, Brendan C. Barry. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Coupled-inductor en
dc.subject Continuous-conduction mode en
dc.subject Discontinuous-conduction mode en
dc.subject Control en
dc.subject DC-DC converter en
dc.title Modelling and digital control of two-phase interleaved coupled-inductor non-isolated DC-DC converters en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral Degree (Structured) en
dc.type.qualificationname PHD (Engineering) en
dc.internal.availability Full text available en
dc.check.info No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Irish Research Council for Science, Engineering and Technology en
dc.description.status Not peer reviewed en
dc.internal.school Electrical and Electronic Engineering en
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.embargoformat Not applicable en
ucc.workflow.supervisor john.hayes@ucc.ie
dc.internal.conferring Spring 2017 en


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© 2016, Brendan C. Barry. Except where otherwise noted, this item's license is described as © 2016, Brendan C. Barry.
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