NDLI: Two new transformerless high step-down DC

Content Provider	IET Digital Library
Author	Saadatizadeh, Zahra Heris, Pedram Chavoshipour Sabahi, Mehran Babaei, Ebrahim
Abstract	In this study, two new high step-down DC–DC converters are proposed. The proposed converters are designed transformerless and have similar power circuits. For controlling the switches of the proposed converters, two distinct switching patterns are applied. The first switching pattern is interleaved pulse-width modulation pulses with 180° phase shifts, which are applied for the first proposed converter, therefore, the first converter has an interleaved switching pattern and its structure is symmetrical, the voltage stress on its elements decreased. On the other hand, there will be two conversion ratio equations for the first proposed converter for duty cycles larger and less than 0.5. The second switching pattern is applied to the proposed second converter; therefore, in this case, the constant voltage gain is obtained for the whole ranges of duty cycles. The sum of voltage stress on its switches and diodes are a little more than the first converter. The proposed converters are analysed for all of their operating modes. To verify the theoretical results, a prototype of the first and second proposed converter for 500/26 and 800/20.5 V, respectively, and 430 W is implemented in laboratory and the extracted results are compared with calculated ones.
Starting Page	1205
Ending Page	1219
Page Count	15
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 5, May (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5484
Journal	IET Power Electronics
Publisher Date	2019-01-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control of Electric Power System DC-DC Power Converter Interleaved Pulse-width Modulation Pulses Interleaved Switching Pattern Power 430.0 W Power Circuit Power Electronics Power Supply PWM Power Converter Supervisory Circuit Switching Converter Transformerless High Step-down DC–DC Converters Voltage 20.5 V Voltage 800.0 V
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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