NDLI: Coupled-inductor-based high-gain converter utilising magnetising inductance to achieve soft-switching with low voltage stress on devices

Content Provider	IET Digital Library
Author	Upadhyay, Prashant Kumar, Rajneesh Sathyan, Shelas
Abstract	This work proposes a soft-switched quadratic quadrupler boost converter with high voltage step up gain and low voltage stress on devices. With this converter topology, high voltage gain is achieved at low duty ratio operation of MOSFETs and few number of turns in coupled inductor. Operation at low duty ratio keeps boost converter gain in linear region and smaller number of turns in coupled inductor reduces the lossy part of the winding. Further, the magnetising inductance of coupled inductor is utilised to achieve zero voltage switching of MOSFETs to minimise the switching loss. In addition, secondary side diodes are operating under zero current switching conditions using resonance between leakage inductance and the capacitors of voltage quadrupler circuit. This greatly reduces the reverse recovery losses of the secondary side diodes. A detailed analysis of converter dynamics is discussed in one of the subsections to find out small-signal transfer functions with respect to variations in input voltage and duty ratio variation of MOSFETs. A 250 W prototype of the proposed converter is built and tested in laboratory with a maximum efficiency of ∼93% at 175 W output power.
Starting Page	576
Ending Page	591
Page Count	16
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 3, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.6147
Journal	IET Power Electronics
Publisher Date	2019-11-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Boost Converter Gain Capacitor Converter Dynamics Converter Topology Coupled Inductor Coupled-inductor-based High-gain Converter DC-DC Power Converter Diode Duty Ratio Variation Field Effect Transistor Switches High Voltage Gain High Voltage Step Inductor Inductors And Transformer Input Voltage Insulated Gate Field Effect Transistors Leakage Inductance Low Duty Ratio Operation Low Voltage Stress Magnetising Inductance MOSFETs Power 175.0 W Power 250.0 W Power Electronics Power Supply Quadratic Quadrupler Boost Converter Secondary Side Diode Soft-switching Supervisory Circuit Switching Converter Switching Loss Transfer Function Voltage Multipliers Voltage Quadrupler Circuit Zero Current Switching Zero Current Switching Condition Zero Voltage Switching
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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