Design and Characterization of a Secondary Side Smart-Power Integrated Active Asynchronous Voltage Clamp

Jindrich WINDELS; Ann MONTÉ; Jan DOUTRELOIGNE

doi:10.1587/transele.E98.C.518

Design and Characterization of a Secondary Side Smart-Power Integrated Active Asynchronous Voltage Clamp

Jindrich WINDELS, Ann MONT'E, Jan DOUTRELOIGNE

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As is well known in the design of transformer isolated converters, the transformer leakage inductance causes a large voltage overshoot on the secondary side switching nodes at every switch transition, unless measures are taken to limit the peak voltage stress. Since the peak voltage stress in smart-power integrated converters, where the power devices are integrated on the same die as the controlling logic and supporting circuits, is the major determining factor for the required silicon area for the implementation, this is a major roadblock for the affordable integration of this type of converter. Therefore, any cost-effective smart-power synchronous rectifier requires a voltage clamping circuit that minimizes the voltage stress, while still maintaining the potential advantages of smart-power converters, i.e. minimizing the number and size of the discrete components in the converter. We present an integrated asynchronous active clamping circuit, that can clamp the overshoot voltage to arbitrary voltages while optimizing the efficiency by only being active when required. Because of the asynchronous operation, the size of the required external components is minimized. Measurements on the smart-power IC implementation of the asynchronous active clamp circuit combined with a secondary side synchronous rectifier for a 1 MHz full bridge converter confirm the reduction in voltage stress and the optimization of the efficiency.

Publication: IEICE TRANSACTIONS on Electronics Vol.E98-C No.6 pp.518-527

Publication Date: 2015/06/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E98.C.518

Type of Manuscript: PAPER

Category: Electronic Circuits

Authors

Jindrich WINDELS
  Ghent University
Ann MONTÉ
  Ghent University
Jan DOUTRELOIGNE
  Ghent University

Keyword

power conversion, clamping, snubber, smps

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Jindrich WINDELS, Ann MONT'E, Jan DOUTRELOIGNE, "Design and Characterization of a Secondary Side Smart-Power Integrated Active Asynchronous Voltage Clamp" in IEICE TRANSACTIONS on Electronics, vol. E98-C, no. 6, pp. 518-527, June 2015, doi: 10.1587/transele.E98.C.518.
Abstract: As is well known in the design of transformer isolated converters, the transformer leakage inductance causes a large voltage overshoot on the secondary side switching nodes at every switch transition, unless measures are taken to limit the peak voltage stress. Since the peak voltage stress in smart-power integrated converters, where the power devices are integrated on the same die as the controlling logic and supporting circuits, is the major determining factor for the required silicon area for the implementation, this is a major roadblock for the affordable integration of this type of converter. Therefore, any cost-effective smart-power synchronous rectifier requires a voltage clamping circuit that minimizes the voltage stress, while still maintaining the potential advantages of smart-power converters, i.e. minimizing the number and size of the discrete components in the converter. We present an integrated asynchronous active clamping circuit, that can clamp the overshoot voltage to arbitrary voltages while optimizing the efficiency by only being active when required. Because of the asynchronous operation, the size of the required external components is minimized. Measurements on the smart-power IC implementation of the asynchronous active clamp circuit combined with a secondary side synchronous rectifier for a 1 MHz full bridge converter confirm the reduction in voltage stress and the optimization of the efficiency.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/transele.E98.C.518/_p

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@ARTICLE{e98-c_6_518,
author={Jindrich WINDELS, Ann MONT'E, Jan DOUTRELOIGNE, },
journal={IEICE TRANSACTIONS on Electronics},
title={Design and Characterization of a Secondary Side Smart-Power Integrated Active Asynchronous Voltage Clamp},
year={2015},
volume={E98-C},
number={6},
pages={518-527},
abstract={As is well known in the design of transformer isolated converters, the transformer leakage inductance causes a large voltage overshoot on the secondary side switching nodes at every switch transition, unless measures are taken to limit the peak voltage stress. Since the peak voltage stress in smart-power integrated converters, where the power devices are integrated on the same die as the controlling logic and supporting circuits, is the major determining factor for the required silicon area for the implementation, this is a major roadblock for the affordable integration of this type of converter. Therefore, any cost-effective smart-power synchronous rectifier requires a voltage clamping circuit that minimizes the voltage stress, while still maintaining the potential advantages of smart-power converters, i.e. minimizing the number and size of the discrete components in the converter. We present an integrated asynchronous active clamping circuit, that can clamp the overshoot voltage to arbitrary voltages while optimizing the efficiency by only being active when required. Because of the asynchronous operation, the size of the required external components is minimized. Measurements on the smart-power IC implementation of the asynchronous active clamp circuit combined with a secondary side synchronous rectifier for a 1 MHz full bridge converter confirm the reduction in voltage stress and the optimization of the efficiency.},
keywords={},
doi={10.1587/transele.E98.C.518},
ISSN={1745-1353},
month={June},}

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TY - JOUR
TI - Design and Characterization of a Secondary Side Smart-Power Integrated Active Asynchronous Voltage Clamp
T2 - IEICE TRANSACTIONS on Electronics
SP - 518
EP - 527
AU - Jindrich WINDELS
AU - Ann MONT'E
AU - Jan DOUTRELOIGNE
PY - 2015
DO - 10.1587/transele.E98.C.518
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E98-C
IS - 6
JA - IEICE TRANSACTIONS on Electronics
Y1 - June 2015
AB - As is well known in the design of transformer isolated converters, the transformer leakage inductance causes a large voltage overshoot on the secondary side switching nodes at every switch transition, unless measures are taken to limit the peak voltage stress. Since the peak voltage stress in smart-power integrated converters, where the power devices are integrated on the same die as the controlling logic and supporting circuits, is the major determining factor for the required silicon area for the implementation, this is a major roadblock for the affordable integration of this type of converter. Therefore, any cost-effective smart-power synchronous rectifier requires a voltage clamping circuit that minimizes the voltage stress, while still maintaining the potential advantages of smart-power converters, i.e. minimizing the number and size of the discrete components in the converter. We present an integrated asynchronous active clamping circuit, that can clamp the overshoot voltage to arbitrary voltages while optimizing the efficiency by only being active when required. Because of the asynchronous operation, the size of the required external components is minimized. Measurements on the smart-power IC implementation of the asynchronous active clamp circuit combined with a secondary side synchronous rectifier for a 1 MHz full bridge converter confirm the reduction in voltage stress and the optimization of the efficiency.
ER -