Efficiency Improvement of a Class E2 Converter for Low Power Inductive Links

Bati, Akram; Luk, Patrick C.K.; Aldhaher, Samer; See, Chan H.; Abd-Alhameed, Raed A.; Excell, Peter S.

Abstract

This work presents a model of a Class E 2 converter for wireless medium power transfer applications. The converter operates at frequency of 200 kHz and consists of an inductive link with its primary coil driven by a class E inverter and the secondary coil with voltage driven class E synchronous rectifier. A 7th order linear time invariant LTI state-space model is used to obtain the eigenvalues of the system for the four modes caused by the operation of the converter switches. A participation factor for the four modes is used to find the actual operating point dominant poles for system response. A dynamic analysis is carried out to investigate the effect of changing separation distance between the two coils based on converter performance and the changes required of some circuit parameters to achieve optimum efficiency and stability. The results show an excellent achievement in terms of efficiency (90-98%) and maintaining constant output voltage by the use of a PI controller with dynamical change of capacitors in the inverter.

• Presentation Conference Type: Conference Paper (Published)
• Conference Name: 2019 26th International Workshop on Electric Drives: Improvement in Efficiency of Electric Drives (IWED)
• Start Date: Jan 30, 2019
• End Date: Feb 2, 2019
• Acceptance Date: Nov 5, 2018
• Online Publication Date: Mar 11, 2019
• Publication Date: 2019-01
• Deposit Date: May 27, 2019
• Publicly Available Date: Jun 19, 2019
• Publisher: Institute of Electrical and Electronics Engineers
• ISBN: 9781538694534
• DOI: https://doi.org/10.1109/iwed.2019.8664221
• Keywords: inductive power transmission, state-space, eigenvalues, dynamic response, PI controller, DC-DC resonant converters, rectifiers, linear time invariant (LTI)
• Public URL: http://researchrepository.napier.ac.uk/Output/1830329
• Contract Date: Jun 19, 2019