NDLI: Digitally controlled GaN-based MHz active clamp flyback converter with dynamic dead time optimisation for AC

Content Provider	IET Digital Library
Author	Gu, Donglie Xi, Jianxiong He, Lenian
Abstract	The active clamp flyback (ACF) converter utilising gallium nitride (GaN) devices with high-switching frequency and high efficiency is impressive in system miniaturisation for AC–DC adapters. Owing to poor reverse conduction of GaN devices, the improper dead time between two switches can cause large power consumption in high frequency. This study proposes a dynamic dead time optimisation technique for GaNs ideal zero-voltage switching (ZVS) to address the issue. It adjusts the clamp switch on time to avoid large reverse conduction voltage stress on the main switch in different loads conditions. In addition, a new control scheme for clamp switch is introduced for enhancing efficiency in light to medium load. These techniques are experimentally verified on a 45 W (20 V/2.25 A) prototype of an ACF converter with a field-programmable gate array. The controller enables the system to operate at 1 MHz and dynamically modulates the dead-time under universal input and full load. With the light load ZVS control scheme, the system can achieve a maximum efficiency of 94.12 and 80.23% in the worst case. The prototyped converter can achieve power density (exclude case and controller) of 18 W/in3.
Starting Page	3777
Ending Page	3786
Page Count	10
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 16, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/16
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2020.0464
Journal	IET Power Electronics
Publisher Date	2020-08-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC-DC Power Converter ACF Converter AC–DC Adapter Circuit Optimisation Clamp Switch Current 2.25 A Digital Control Digitally Controlled Gallium Nitride-based MHz Active Clamp Flyback Converter Dynamic Dead Time Optimisation Technique Field Programmable Gate Array Field-programmable Gate Array Frequency 1.0 MHz Full Load Gallium Compound Gallium Nitride Device GaN High-switching Frequency III-V SemiConductor Light Load ZVS Control Scheme Load Condition Logic Circuit Main Switch Power 18.0 W Power 45.0 W Power Consumption Power Density Power Electronics Power Supply Relay And Switches Reverse Conduction Voltage Stress Supervisory Circuit Switched Mode Converter Switching Converter System Miniaturisation Universal Input Load Voltage 20.0 V Wide Band Gap SemiConductor Zero Voltage Switching
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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