scholarly journals A Low Power Single-stage LED Driver Operating between Discontinuous Conduction Mode and Critical Conduction Mode

2015 ◽  
Vol 74 ◽  
pp. 817-825 ◽  
Author(s):  
Faris Al-Naemi ◽  
Jianbo Yang ◽  
Weiping Zhang
Keyword(s):  
Low Power ◽  
Single Stage ◽  
Led Driver ◽  
Discontinuous Conduction Mode ◽  
Conduction Mode

Single Stage Single Switch Power Supply (S4PS)Design for Low Power HB-LED Lighting

2013 ◽  
Vol 14 (1) ◽  
pp. 33-40
Author(s):  
Ashish Shrivastava ◽  
Bhim Singh
Keyword(s):  
Low Power ◽  
Power Quality ◽  
Power Supply ◽  
Light Emitting Diode ◽  
Harmonic Distortion ◽  
Input Power ◽  
Single Stage ◽  
Led Driver ◽  
Converter Topology ◽  
Conduction Mode

Abstract This paper presents an improved power quality converter (IPQC)-based power supply design for high brightness light emitting diode (HB-LED) low power lighting. The IPQC circuit uses a Cuk buck-boost converter to operate it in a discontinuous conduction mode (DCM) using the voltage follower technique for the mitigation of harmonic contents present in the AC mains current. Subsequently, reduction in harmonic contents results in improving the power quality indices at the AC mains. Single-stage single switch converter topology is used, which has less component count, size and cost as compared to the two-stage converter topology. DCM operation has an advantage that only output voltage control loop is required as compared to three control loops required in the continuous conduction mode operation. An 18-W LED driver is designed, modeled and simulated using MATLAB/Simulink software for 220 V, 50 Hz AC mains. The performance of the proposed LED driver is observed in terms of total harmonic distortion of the input current (THDi), input power factor (PF) and crest factor (CF) taking into account the strict international standard of IEC 61000-3-2 for class C equipments.

scholarly journals Design and Implementation of a Single-Stage PFC Active-Clamp Flyback Converter with Dual Transformers

Electronics ◽  
2021 ◽  
Vol 10 (21) ◽  
pp. 2588
Author(s):  
Sen-Tung Wu ◽  
Yu-Ting Cheng
Keyword(s):  
Power Factor ◽  
Load Condition ◽  
Stage Structure ◽  
Single Stage ◽  
Switching Frequency ◽  
Conduction Loss ◽  
Discontinuous Conduction Mode ◽  
Active Clamp ◽  
Secondary Side ◽  
Conduction Mode

This paper proposes an AC/DC single-stage structure by integrating a boost topology and an active clamp flyback (ACF) circuit with power-factor-correction (PFC) function. The PFC function can be achieved by controlling a boost PFC topology operated in the discontinuous conduction mode. With the coordination of active clamping components, a resonant technique is obtained and zero-voltage-switching (ZVS) can be achieved. The proposed converter is combined with the advantages of: (1) compared with two-stage circuit, a single stage circuit decreases the component of the main circuit and reduces the complexity of the control circuit; (2) a boost topology with PFC function operated in discontinuous conduction mode can be accomplished without adding any current detecting technique or detecting input signal; (3) by using the inductor from the PFC stage, ZVS function can be achieved without any additional inductor; (4) the increment of switching frequency facilitates the optimization of power density; (5) the conducting loss at the secondary side can be reduced by adding the synchronous rectification; (6) in this proposed scheme, the dual transformers with series-parallel connection are utilized, the current at the secondary side can be shared for lowering the conduction loss of the synchronous transistors. Finally, a prototype converter with AC 110 V input and DC 19 V/6.32 A (120 W) output under 300 kHz switching frequency is implemented. The efficiency of the proposed converter reaches 88.20% and 0.984 power factor in full load condition.

A Single-Stage Low-Power AC–DC RGB-LED Driver With Switching Capacitor Control Scheme

2021 ◽  
Vol 68 (4) ◽  
pp. 3103-3112 ◽  
Author(s):  
Pang-Jung Liu ◽  
Zhi-Yuan Hong ◽  
Chun-Cheng Hung
Keyword(s):  
Low Power ◽  
Single Stage ◽  
Led Driver ◽  
Control Scheme

scholarly journals Derivation of OCC Modulator for Grid-Tied Single-Stage Buck-Boost Inverter Operating in the Discontinuous Conduction Mode

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3168
Author(s):  
Ben Zhao ◽  
Yigeng Huangfu ◽  
Alexander Abramovitz
Keyword(s):  
High Gain ◽  
Single Stage ◽  
Modulation Scheme ◽  
Control Law ◽  
Switching Loss ◽  
Discontinuous Conduction Mode ◽  
The One ◽  
Grid Level ◽  
Conduction Mode ◽  
Micro Inverter

This paper is concerned with the derivation of a one-cycle controller for driving a single-stage buck-boost DC-AC micro-inverter in grid-tied applications. The topology under study is based on a full-bridge switch arrangement with no unfolder circuit. The proposed micro-inverter attains a high gain by applying a multi-winding tapped inductor and, therefore, can operate at grid-level voltage without using a DC-DC step-up stage. To minimize the switching loss, the proposed inverter is operated in the discontinuous conduction mode. The operation principles of the proposed topology in the discontinuous conduction mode are discussed and analyzed. Based on the analysis, the one-cycle control law and modulator circuitry needed to control the proposed micro-inverter are developed. The feasibility of the proposed modulation scheme is verified by simulation.

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