scholarly journals Stability analysis of equivalent series resistance of output capacitor in fixed off-time controlled Buck converter

2012 ◽  
Vol 61 (16) ◽  
pp. 160503
Author(s):  
Zhang Xi ◽  
Bao Bo-Cheng ◽  
Wang Jin-Ping ◽  
Ma Zheng-Hua ◽  
Xu Jian-Ping
Keyword(s):  
Stability Analysis ◽  
Series Resistance ◽  
Buck Converter ◽  
Equivalent Series Resistance ◽  
Output Capacitor ◽  
Off Time

scholarly journals ESR Estimation Schemes of Output Capacitor for Buck Converter from Capacitor Perspective

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1596
Author(s):  
Lei Ren ◽  
Lei Zhang ◽  
Chunying Gong
Keyword(s):  
Buck Converter ◽  
Electrolytic Capacitor ◽  
Equivalent Series Resistance ◽  
Power Electronic Converters ◽  
Aluminum Electrolytic Capacitor ◽  
Advantages And Disadvantages ◽  
Optimal Period ◽  
Current Characteristics ◽  
Output Capacitor ◽  
Conduction Mode

The aluminum electrolytic capacitor (AEC) is one of the most vulnerable parts in power electronic converters and its reliability is crucial to the whole system. With the growth of service time, the equivalent series resistance (ESR) increases and the capacitance (C) decreases due to the loss of electrolytes, which will result in extra power loss and even damage to transistors. To prevent significant damages, the AEC must be replaced at an optimal period and online health monitoring is indispensable. Through the analysis of degradation parameters (ESR and C), ESR is proved to be a better health indicator and therefore is determined as the monitoring parameter for AEC. From the capacitor perspective, ESR estimation schemes of output capacitors for a Buck converter are studied. Based on the voltage–current characteristics, two ESR calculation models are proposed, which are applicable for both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). From the point of implementation view, the advantages and disadvantages of the two estimation schemes are pointed out, respectively. A Buck prototype is built and tested, and simulation and experimental results are provided to validate the proposed ESR estimation schemes.

Critical ESR of output capacitor for stability of fixed off‐time controlled buck converter

2013 ◽  
Vol 49 (4) ◽  
pp. 287-288 ◽  
Author(s):  
B.C. Bao ◽  
X. Zhang ◽  
J.P. Xu ◽  
J.P. Wang
Keyword(s):  
Buck Converter ◽  
Output Capacitor ◽  
Off Time

scholarly journals Neural Network Based Prediction of Stable Equivalent Series Resistance in Voltage Regulator Characterization

2018 ◽  
Vol 7 (1) ◽  
pp. 134-142
Author(s):  
Mohd Hairi Mohd Zaman ◽  
M. M. Mustafa ◽  
M. A. Hannan ◽  
Aini Hussain
Keyword(s):  
Neural Network ◽  
New Product Development ◽  
Series Resistance ◽  
Voltage Regulator ◽  
Stable Range ◽  
Equivalent Series Resistance ◽  
Time To Market ◽  
Output Stability ◽  
Output Capacitor ◽  
Manufacturing Time

High demand on voltage regulator (VR) currently requires VR manufacturers to improve their time-to-market, particularly for new product development. To fulfill the output stability requirement, VR manufacturers characterize the VR in terms of the equivalent series resistance (ESR) of the output capacitor because the ESR variation affects the VR output stability. The VR characterization outcome suggests a stable range of ESR, which is indicated in the ESR tunnel graph in the VR datasheet. However, current practice in industry manually characterizes VR, thereby increasing the manufacturing time and cost. Therefore, an efficient method based on multilayer neural network has been developed to obtain the ESR tunnel graph. The results show that this method able to reduce the VR characterization time by approximately 53% and achieved critical ESR prediction error less than 5%. This work demonstrated an efficient and effective approach for VR characterization in terms of ESR.

scholarly journals Analysis and Design for Output Voltage Regulation in Constant-on-Time-Controlled Fly-Buck Converter

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1886
Author(s):  
Younghoon Cho ◽  
Paul Jang
Keyword(s):  
Output Voltage ◽  
Voltage Regulation ◽  
Design Guidelines ◽  
Buck Converter ◽  
Design Guideline ◽  
Analysis And Design ◽  
Flyback Converter ◽  
Auxiliary Power ◽  
Primary Output ◽  
Output Capacitor

Fly-buck converter is a multi-output converter with the structure of a synchronous buck converter structure on the primary side and a flyback converter structure on the secondary side, and can be utilized in various applications due to its many advantages. In terms of control, the primary side of the fly-buck converter has the same structure as a synchronous buck converter, allowing the constant-on-time (COT) control to be applied to the fly-buck converter. However, due to the inherent energy transfer principle, the primary-side output voltage regulation of COT controlled fly-buck converters may be poor, which can deteriorate the overall converter performance. Therefore, the primary output capacitor must be carefully designed to improve the voltage regulation characteristics. In this paper, a theoretical analysis of the output voltage regulation in COT controlled fly-buck converter is conducted, and based on this, a design guideline for the primary output capacitor considering the output voltage regulation is presented. The validity of the analysis and design guidelines was verified using a 5 W prototype of the COT controlled fly-buck converter for telecommunication auxiliary power supply.

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