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With ever increasing demands of smaller size, lighter weight for all forms of consumer electronics, efficient power conversion with higher operating frequency has always being pursued rigorously. This paper demonstrates high frequency, high efficiency and high power density design of active clamp flyback converter for adapter application. Both the primary and secondary switches are gallium nitride...
In this paper, the performance of different interleaving control methods for gallium-nitride (GaN) devices based MHz critical conduction mode (CRM) totem-pole power factor correction (PFC) circuit is compared. Both closed-loop interleaving and open-loop interleaving are good for low frequency CRM PFC; but for MHz very high frequency CRM PFC with microcontroller (MCU) implementation, open-loop interleaving...
Distributed Maximum Power Point Tracking (DMPPT) concept provides effective anti-mismatch feature, however, it fails in extreme mismatch situation. To get full profit from PV system, quantitatively static analyzes of major DMPPT structures are presented. The existence criteria and quantitative evaluation method for optimal power region of different DMPPT structures are first proposed. Simulation and...
This paper presents adaptive ripple-based constant on-time control architecture for buck converter ICs with wide duty ratio applications. An internal ramp compensation with emulating inductor current ripple is implemented to solve the ripple oscillation instability issue when using low-ESR output capacitors in buck converters. Therefore, no external compensation is required to simplify the system...
This paper addresses the power loss issue results from mismatch case which is critical to improving overall efficiency of the residential PV system. In general, a dedicated DC-DC converter with an extra distributed MPPT (Max Power Point Tracking) algorithm, what is called a MIMC (Module Integrated MPPT Converter), is connected to each panel to reduce the mismatch impact. However, even by adopting...
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