A Novel Alternating Voltage Controlled Current Sensing Method for Suppressing Thermal Dependency
Summary :
Voltage Regulator Module, called VRM is a dedicated module for supplying power to microprocessor units. Recently, significant improvement of microprocessor units arises new challenges for supplying stable power. For stable and efficient control, multiphase interleaved topology is often used in today's VRM. To achieve high performance VRM, a current sensing circuit with both high efficiency and high accuracy is demanded. To achieve high accuracy, thermal dependency is a problem to be solved. In this paper, a novel alternating voltage controlled current sensing method is proposed for suppressing thermal dependency. In the proposed method, a high frequency AC voltage is superposed on the gate-ON-voltage. Then, the AC channel current is generated, and its amplitude becomes proportional to inductor current. The AC channel current is detected through a LC filter. The proposed current sensing method is very effective for realizing a current mode control DC-DC converter. In first, we simulated the relationship between our proposed current sensing method and a electrical characteristic of a power MOSFET. We used a power MOSFET device model published by a manufacture in this simulation. From the results, we find the gate parasitic capacitance of power MOSFET effects on the sensitivity of the current sensing circuit. Besides, the power dissipation in a power MOSFET increases by the frequency of applied gate ac voltage. Moreover, the proposed current sensing circuit based on the proposed method was designed and simulated the operations by Hspice. From the results, the designed current sensing circuit based on the proposed method has enough wide sensing window from 3A to 30A for VRM applications. Moreover, comparing to the conventional current sensing circuits with the MOSFET ON-resistance, the error of the proposed current sensing circuit can be decreased over 25% near 100°C.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E97-C No.5 pp.431-437
- Publication Date
- 2014/05/01
- Publicized
- Online ISSN
- 1745-1353
- DOI
- 10.1587/transele.E97.C.431
- Type of Manuscript
- Special Section PAPER (Special Section on Fundamentals and Applications of Advanced Semiconductor Devices)
- Category
Authors
Kazuki ITOH
Tohoku University,JST-CREST
Tetsuo ENDOH
Tohoku University
Keyword
Latest Issue
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Kazuki ITOH, Tetsuo ENDOH, "A Novel Alternating Voltage Controlled Current Sensing Method for Suppressing Thermal Dependency" in IEICE TRANSACTIONS on Electronics,
vol. E97-C, no. 5, pp. 431-437, May 2014, doi: 10.1587/transele.E97.C.431.
Abstract: Voltage Regulator Module, called VRM is a dedicated module for supplying power to microprocessor units. Recently, significant improvement of microprocessor units arises new challenges for supplying stable power. For stable and efficient control, multiphase interleaved topology is often used in today's VRM. To achieve high performance VRM, a current sensing circuit with both high efficiency and high accuracy is demanded. To achieve high accuracy, thermal dependency is a problem to be solved. In this paper, a novel alternating voltage controlled current sensing method is proposed for suppressing thermal dependency. In the proposed method, a high frequency AC voltage is superposed on the gate-ON-voltage. Then, the AC channel current is generated, and its amplitude becomes proportional to inductor current. The AC channel current is detected through a LC filter. The proposed current sensing method is very effective for realizing a current mode control DC-DC converter. In first, we simulated the relationship between our proposed current sensing method and a electrical characteristic of a power MOSFET. We used a power MOSFET device model published by a manufacture in this simulation. From the results, we find the gate parasitic capacitance of power MOSFET effects on the sensitivity of the current sensing circuit. Besides, the power dissipation in a power MOSFET increases by the frequency of applied gate ac voltage. Moreover, the proposed current sensing circuit based on the proposed method was designed and simulated the operations by Hspice. From the results, the designed current sensing circuit based on the proposed method has enough wide sensing window from 3A to 30A for VRM applications. Moreover, comparing to the conventional current sensing circuits with the MOSFET ON-resistance, the error of the proposed current sensing circuit can be decreased over 25% near 100°C.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E97.C.431/_p
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@ARTICLE{e97-c_5_431,
author={Kazuki ITOH, Tetsuo ENDOH, },
journal={IEICE TRANSACTIONS on Electronics},
title={A Novel Alternating Voltage Controlled Current Sensing Method for Suppressing Thermal Dependency},
year={2014},
volume={E97-C},
number={5},
pages={431-437},
abstract={Voltage Regulator Module, called VRM is a dedicated module for supplying power to microprocessor units. Recently, significant improvement of microprocessor units arises new challenges for supplying stable power. For stable and efficient control, multiphase interleaved topology is often used in today's VRM. To achieve high performance VRM, a current sensing circuit with both high efficiency and high accuracy is demanded. To achieve high accuracy, thermal dependency is a problem to be solved. In this paper, a novel alternating voltage controlled current sensing method is proposed for suppressing thermal dependency. In the proposed method, a high frequency AC voltage is superposed on the gate-ON-voltage. Then, the AC channel current is generated, and its amplitude becomes proportional to inductor current. The AC channel current is detected through a LC filter. The proposed current sensing method is very effective for realizing a current mode control DC-DC converter. In first, we simulated the relationship between our proposed current sensing method and a electrical characteristic of a power MOSFET. We used a power MOSFET device model published by a manufacture in this simulation. From the results, we find the gate parasitic capacitance of power MOSFET effects on the sensitivity of the current sensing circuit. Besides, the power dissipation in a power MOSFET increases by the frequency of applied gate ac voltage. Moreover, the proposed current sensing circuit based on the proposed method was designed and simulated the operations by Hspice. From the results, the designed current sensing circuit based on the proposed method has enough wide sensing window from 3A to 30A for VRM applications. Moreover, comparing to the conventional current sensing circuits with the MOSFET ON-resistance, the error of the proposed current sensing circuit can be decreased over 25% near 100°C.},
keywords={},
doi={10.1587/transele.E97.C.431},
ISSN={1745-1353},
month={May},}
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TY - JOUR
TI - A Novel Alternating Voltage Controlled Current Sensing Method for Suppressing Thermal Dependency
T2 - IEICE TRANSACTIONS on Electronics
SP - 431
EP - 437
AU - Kazuki ITOH
AU - Tetsuo ENDOH
PY - 2014
DO - 10.1587/transele.E97.C.431
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E97-C
IS - 5
JA - IEICE TRANSACTIONS on Electronics
Y1 - May 2014
AB - Voltage Regulator Module, called VRM is a dedicated module for supplying power to microprocessor units. Recently, significant improvement of microprocessor units arises new challenges for supplying stable power. For stable and efficient control, multiphase interleaved topology is often used in today's VRM. To achieve high performance VRM, a current sensing circuit with both high efficiency and high accuracy is demanded. To achieve high accuracy, thermal dependency is a problem to be solved. In this paper, a novel alternating voltage controlled current sensing method is proposed for suppressing thermal dependency. In the proposed method, a high frequency AC voltage is superposed on the gate-ON-voltage. Then, the AC channel current is generated, and its amplitude becomes proportional to inductor current. The AC channel current is detected through a LC filter. The proposed current sensing method is very effective for realizing a current mode control DC-DC converter. In first, we simulated the relationship between our proposed current sensing method and a electrical characteristic of a power MOSFET. We used a power MOSFET device model published by a manufacture in this simulation. From the results, we find the gate parasitic capacitance of power MOSFET effects on the sensitivity of the current sensing circuit. Besides, the power dissipation in a power MOSFET increases by the frequency of applied gate ac voltage. Moreover, the proposed current sensing circuit based on the proposed method was designed and simulated the operations by Hspice. From the results, the designed current sensing circuit based on the proposed method has enough wide sensing window from 3A to 30A for VRM applications. Moreover, comparing to the conventional current sensing circuits with the MOSFET ON-resistance, the error of the proposed current sensing circuit can be decreased over 25% near 100°C.
ER -
English
