Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/629528
Title: Unified Equivalent Circuit Model and Optimal Design of V^{2} Controlled Buck Converters
Authors: Shuilin Tian;Fred C. Lee;Qiang Li;Yingyi Yan
subject: enhanced V2 control and optimal design guidelines;ripplebased control;Equivalent circuit model,;V2 control,
Year: 2016
Publisher: IEEE
Abstract: V2 control has advantages of simple implementation and fast transient response and is widely used in industry for point-of-load applications. This control scheme is elegant when output capacitors with large RC time constant are employed, such as OSCON capacitors. However, in most cases using capacitors with small RC time constant, such as ceramic capacitors, instability problem will occur. Previous modeling methods including sampled-data modeling, discrete-time analysis, time-domain analysis, and describing function are all very mathematical and difficult to apply for practical engineers as little physical insight can be extracted. Up to now, no equivalent circuit model is proposed which is able to predict the instability issue and serve as a useful design tool for V2 control. This paper proposes a unified equivalent circuit model which is applicable to all types of capacitors by considering the effect of capacitor voltage ripple. The equivalent circuit provides the physical insight of V2 control as a nonideal voltage source, a dual concept of previous nonideal current source for current-mode control. The equivalent circuit model is a simple yet accurate complete model and is very helpful for design purpose. Optimal design guidelines for point-of-load applications are provided. The proposed equivalent circuit model is applicable to both variable frequency modulation and constant frequency modulation. The equivalent circuit model and design guidelines are verified with Simplis simulation and experimental results.
URI: http://localhost/handle/Hannan/181517
http://localhost/handle/Hannan/629528
ISSN: 0885-8993
1941-0107
volume: 31
issue: 2
Appears in Collections:2016

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Title: Unified Equivalent Circuit Model and Optimal Design of V^{2} Controlled Buck Converters
Authors: Shuilin Tian;Fred C. Lee;Qiang Li;Yingyi Yan
subject: enhanced V2 control and optimal design guidelines;ripplebased control;Equivalent circuit model,;V2 control,
Year: 2016
Publisher: IEEE
Abstract: V2 control has advantages of simple implementation and fast transient response and is widely used in industry for point-of-load applications. This control scheme is elegant when output capacitors with large RC time constant are employed, such as OSCON capacitors. However, in most cases using capacitors with small RC time constant, such as ceramic capacitors, instability problem will occur. Previous modeling methods including sampled-data modeling, discrete-time analysis, time-domain analysis, and describing function are all very mathematical and difficult to apply for practical engineers as little physical insight can be extracted. Up to now, no equivalent circuit model is proposed which is able to predict the instability issue and serve as a useful design tool for V2 control. This paper proposes a unified equivalent circuit model which is applicable to all types of capacitors by considering the effect of capacitor voltage ripple. The equivalent circuit provides the physical insight of V2 control as a nonideal voltage source, a dual concept of previous nonideal current source for current-mode control. The equivalent circuit model is a simple yet accurate complete model and is very helpful for design purpose. Optimal design guidelines for point-of-load applications are provided. The proposed equivalent circuit model is applicable to both variable frequency modulation and constant frequency modulation. The equivalent circuit model and design guidelines are verified with Simplis simulation and experimental results.
URI: http://localhost/handle/Hannan/181517
http://localhost/handle/Hannan/629528
ISSN: 0885-8993
1941-0107
volume: 31
issue: 2
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7091020.pdf689.98 kBAdobe PDFThumbnail
Preview File
Title: Unified Equivalent Circuit Model and Optimal Design of V^{2} Controlled Buck Converters
Authors: Shuilin Tian;Fred C. Lee;Qiang Li;Yingyi Yan
subject: enhanced V2 control and optimal design guidelines;ripplebased control;Equivalent circuit model,;V2 control,
Year: 2016
Publisher: IEEE
Abstract: V2 control has advantages of simple implementation and fast transient response and is widely used in industry for point-of-load applications. This control scheme is elegant when output capacitors with large RC time constant are employed, such as OSCON capacitors. However, in most cases using capacitors with small RC time constant, such as ceramic capacitors, instability problem will occur. Previous modeling methods including sampled-data modeling, discrete-time analysis, time-domain analysis, and describing function are all very mathematical and difficult to apply for practical engineers as little physical insight can be extracted. Up to now, no equivalent circuit model is proposed which is able to predict the instability issue and serve as a useful design tool for V2 control. This paper proposes a unified equivalent circuit model which is applicable to all types of capacitors by considering the effect of capacitor voltage ripple. The equivalent circuit provides the physical insight of V2 control as a nonideal voltage source, a dual concept of previous nonideal current source for current-mode control. The equivalent circuit model is a simple yet accurate complete model and is very helpful for design purpose. Optimal design guidelines for point-of-load applications are provided. The proposed equivalent circuit model is applicable to both variable frequency modulation and constant frequency modulation. The equivalent circuit model and design guidelines are verified with Simplis simulation and experimental results.
URI: http://localhost/handle/Hannan/181517
http://localhost/handle/Hannan/629528
ISSN: 0885-8993
1941-0107
volume: 31
issue: 2
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7091020.pdf689.98 kBAdobe PDFThumbnail
Preview File