NDLI: Adaptive frequency adjustment technique in current mode DC–DC converters for input voltage range extension

Content Provider	IET Digital Library
Author	Xiao, Zhiming Zhao, Guangshu Wang, Yu Wang, Huashu Hu, Weibo
Abstract	This study presents a switching frequency adjustment technique that helps widen the input voltage range of a current mode DC–DC converter. Conventional current-mode switching converters suffer the minimum on/off time restrictions that limit the input-to-output conversion ratio. This work introduces an additional regulation loop on top of an existing converter that regulates the switching period when the minimum on/off time limit is approached. Compared with a converter with fixed switching frequency, the proposed approach allows the free-running switching to be set without being limited by the minimum on/off time. A boost topology with output voltage of 24 V was built based on the proposed approach, and the measured valid input voltage range was extended from 8–16 to 3–21 V by the proposed scheme under 1 MHz preset frequency. Since the slope-compensation current, the inductor size, and the output capacitor are all optimised at 1 MHz and is not limited by the minimum on/off time which may lower the switching frequency of a conventional converter down to 450 kHz, the measured maximum available output current and the typical output voltage ripple under 12 V input achieved 1.57 A and 57 mV, respectively.
Starting Page	557
Ending Page	566
Page Count	10
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 3, Mar (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5415
Journal	IET Power Electronics
Publisher Date	2018-11-26
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Frequency Adjustment Technique Current 1.57 A Current Mode DC–DC Converter Current-mode Switching Converter DC-DC Power Converter Fixed Switching Frequency Free-running Switching Frequency 1.0 MHz Frequency 450.0 KHz Inductor Input Voltage Range Extension Input-to-output Conversion Ratio Power Electronics Power Supply Slope-compensation Current Supervisory Circuit Switching Converter Switching Frequency Adjustment Technique Switching Period Voltage 12.0 V Voltage 24.0 V Voltage 3.0 V to 21.0 V Voltage 57.0 MV
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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