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This paper presents a look-up table based digital control approach to on-line efficiency optimization over wide ranges of operating conditions. The proposed digital controller allows programmable modes of operation based on off-line efficiency characterization and optimization. Applied to a flyback dc-dc converter, the controller adopts valley switching in discontinuous conduction mode (DCM), which...
In this paper we propose a controlled cross-coupled switched-capacitor based embedded DC-DC buck converter based on non-overlapping rotational time interleaving switching scheme and frequency control regulation. Proposed converter uses low swing internal signals to control half of the switches. In addition to reduction of switching power loss, the low swing control signals help to use smaller switches...
A novel half-bridge LLC DC-DC Resonant Converter for high power DC power supply is presented in this paper. The design consideration of resonant tank circuit paramerters are presented. The DC gain characteristics of the proposed converter is analyzed from its complex DC gain equation. First the performance of the converter is analyzed through simulation. The proposed converter operate with higher...
This paper proposes a DC-DC buck power converter chip with a novel integrated PWM/PFM hybrid-mode control. The DC-DC converter chip with synchronous rectifier not only uses current-mode feedback control but also possesses constant-frequency-mode control and hybrid-mode control functions at the same time. Furthermore, the operational modes of the converter can be selected by an external voltage signal...
Maintaining high-efficiency through wide load ranges is important for switching DC-DC converter designs. By appropriately varying the switching frequencies with various load currents, the power-efficiency can be improved. The optimal relationship of switching frequencies versus load currents can be obtained by evaluating the power-loss models of switching converters. In this paper, a variable-frequency...
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