Lookup NU author(s): Dr Musbahu Muhammad,
Dr Matthew Armstrong,
Dr Mohammed Elgendy
This is the authors' accepted manuscript of an article that has been published in its final definitive form by IET, 2017.
For re-use rights please refer to the publisher's terms and conditions.
High step-up DC–DC converters are increasingly required in many industrial applications. Conventional topologies operate at extreme duty cycle, high-semiconductor voltage stress, switching loss, and diode reverse recovery problems. This study presents a new non-isolated high gain, boost converter operating with a modest duty cycle by integrating a coupled inductor and switched capacitor technique. Importantly, the structure of the high-voltage side, together with the switched capacitor, reduces the voltage stress of the power switch to less than one third of the output voltage, which in turn helps to reduce the conduction loss by using a low on-resistance (Rds-on) switch. The diode voltage stress is less than the output voltage which facilitates faster recovery. Furthermore, the converter employs a passive clamp circuit to recycle the leakage energy. The main switch achieves zero current switching (ZCS) turn-on performance and all diodes achieve (ZCS) turn off reducing reverse recovery related losses. As a result, the circuit exhibits high efficiency performance; which is essential for most modern power electronic applications. In this study, the operational principle and performance characteristics of the proposed converter is presented and validated experimentally with a 250 W, 20 V input voltage/190 V output voltage prototype circuit.
Author(s): Muhammad M, Armstrong M, Elgendy MA
Publication type: Article
Publication status: Published
Journal: IET Power Electronics
Online publication date: 14/09/2017
Acceptance date: 20/03/2017
Date deposited: 03/07/2017
ISSN (print): 1755-4535
ISSN (electronic): 1755-4543
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