27.6 Background Capacitor-Current-Sensor Calibration of DC-DC Buck Converter with DVS for Accurately Accelerating Load-Transient Response

Tai-Haur Kuo, Yi Wei Huang, Pai Yi Wang

研究成果: Conference contribution

摘要

Switching buck converters with dynamic voltage scaling (DVS) for high-efficiency high-performance computing applications need to reduce the output-voltage undershoot/overshoot (V-{ {US}}/V-{ {OS}}) and settling time t-{ {S}} under a large and fast-changing load current (I-{ {load}}). A multiphase topology with a fast load-transient response meets these requirements. The load-transient response can be accurately accelerated to reduce V-{ {US}}/V-{ {OS}} and t-{ {S}} to near their ideal values by measuring the output-capacitor current I-{ {C} {o}} to control the inductor's energizing and de-energizing times, since I-{ {C} {o}} instantly reflects the load-current transients. An integrated capacitor-current sensor (CCS) [1] can be used to sense I-{ {C} {o}} by emulating the output-capacitor impedance Z-{ {C} {o}}: comprising capacitance C-{{O}}, the equivalent series resistance R-{ {E} {S} {R}}, and inductance L-{ {E} {S} {L}}. However, I-{ {C} {o}} will be inaccurately sensed if Z-{ {C} {o}} varies with different output voltages V-{{O}}, manufacturing variations, PCB parasitics, temperature, and aging. The state-of-the-art CCS calibration technique [1] for such Z-{ {C} {o}} variations is suitable for foreground operation and DVS with pre-characterized V-{{O}} levels, since calibration starts immediately after being enabled and runs continuously until it ends. The CCS in [1] is calibrated with a low-power cost-effective comparator and successive approximation logic, with an acceptable calibration time T-{{CAL}} for foreground operation. To broaden the range of applications, this work proposes an ADC-based CCS and a background CCS calibration (BCC) controller. The proposed CCS uses a flash ADC with a dynamic reference to shorten T-{ {C} {A} {L}}. The BCC controller automatically finds a quasi-steady state (OS), namely a short period of steady-state behavior when there is no load transient or DVS event, to trigger CCS calibration, and can interrupt CCS calibration when a load transient or a DVS event occurs. Since OSs generally exist, the BCC with a short T-{{CAL}} can increase the flexibility of scheduling both load transients and DVS events. Thus, it is suitable for DVS with numerous V-{{O}} levels that account for in situ parameter variations.

原文English
主出版物標題2019 IEEE International Solid-State Circuits Conference, ISSCC 2019
發行者Institute of Electrical and Electronics Engineers Inc.
頁面430-432
頁數3
ISBN(電子)9781538685310
DOIs
出版狀態Published - 2019 三月 6
事件2019 IEEE International Solid-State Circuits Conference, ISSCC 2019 - San Francisco, United States
持續時間: 2019 二月 172019 二月 21

出版系列

名字Digest of Technical Papers - IEEE International Solid-State Circuits Conference
2019-February
ISSN(列印)0193-6530

Conference

Conference2019 IEEE International Solid-State Circuits Conference, ISSCC 2019
國家United States
城市San Francisco
期間19-02-1719-02-21

指紋

DC-DC converters
Transient analysis
Capacitors
Calibration
Sensors
Voltage scaling
Controllers
Polychlorinated Biphenyls
Electric potential
Polychlorinated biphenyls
Inductance
Capacitance
Aging of materials
Scheduling
Topology

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

引用此文

Kuo, T-H., Huang, Y. W., & Wang, P. Y. (2019). 27.6 Background Capacitor-Current-Sensor Calibration of DC-DC Buck Converter with DVS for Accurately Accelerating Load-Transient Response. 於 2019 IEEE International Solid-State Circuits Conference, ISSCC 2019 (頁 430-432). [8662296] (Digest of Technical Papers - IEEE International Solid-State Circuits Conference; 卷 2019-February). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISSCC.2019.8662296
Kuo, Tai-Haur ; Huang, Yi Wei ; Wang, Pai Yi. / 27.6 Background Capacitor-Current-Sensor Calibration of DC-DC Buck Converter with DVS for Accurately Accelerating Load-Transient Response. 2019 IEEE International Solid-State Circuits Conference, ISSCC 2019. Institute of Electrical and Electronics Engineers Inc., 2019. 頁 430-432 (Digest of Technical Papers - IEEE International Solid-State Circuits Conference).
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abstract = "Switching buck converters with dynamic voltage scaling (DVS) for high-efficiency high-performance computing applications need to reduce the output-voltage undershoot/overshoot (V-{ {US}}/V-{ {OS}}) and settling time t-{ {S}} under a large and fast-changing load current (I-{ {load}}). A multiphase topology with a fast load-transient response meets these requirements. The load-transient response can be accurately accelerated to reduce V-{ {US}}/V-{ {OS}} and t-{ {S}} to near their ideal values by measuring the output-capacitor current I-{ {C} {o}} to control the inductor's energizing and de-energizing times, since I-{ {C} {o}} instantly reflects the load-current transients. An integrated capacitor-current sensor (CCS) [1] can be used to sense I-{ {C} {o}} by emulating the output-capacitor impedance Z-{ {C} {o}}: comprising capacitance C-{{O}}, the equivalent series resistance R-{ {E} {S} {R}}, and inductance L-{ {E} {S} {L}}. However, I-{ {C} {o}} will be inaccurately sensed if Z-{ {C} {o}} varies with different output voltages V-{{O}}, manufacturing variations, PCB parasitics, temperature, and aging. The state-of-the-art CCS calibration technique [1] for such Z-{ {C} {o}} variations is suitable for foreground operation and DVS with pre-characterized V-{{O}} levels, since calibration starts immediately after being enabled and runs continuously until it ends. The CCS in [1] is calibrated with a low-power cost-effective comparator and successive approximation logic, with an acceptable calibration time T-{{CAL}} for foreground operation. To broaden the range of applications, this work proposes an ADC-based CCS and a background CCS calibration (BCC) controller. The proposed CCS uses a flash ADC with a dynamic reference to shorten T-{ {C} {A} {L}}. The BCC controller automatically finds a quasi-steady state (OS), namely a short period of steady-state behavior when there is no load transient or DVS event, to trigger CCS calibration, and can interrupt CCS calibration when a load transient or a DVS event occurs. Since OSs generally exist, the BCC with a short T-{{CAL}} can increase the flexibility of scheduling both load transients and DVS events. Thus, it is suitable for DVS with numerous V-{{O}} levels that account for in situ parameter variations.",
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Kuo, T-H, Huang, YW & Wang, PY 2019, 27.6 Background Capacitor-Current-Sensor Calibration of DC-DC Buck Converter with DVS for Accurately Accelerating Load-Transient Response. 於 2019 IEEE International Solid-State Circuits Conference, ISSCC 2019., 8662296, Digest of Technical Papers - IEEE International Solid-State Circuits Conference, 卷 2019-February, Institute of Electrical and Electronics Engineers Inc., 頁 430-432, 2019 IEEE International Solid-State Circuits Conference, ISSCC 2019, San Francisco, United States, 19-02-17. https://doi.org/10.1109/ISSCC.2019.8662296

27.6 Background Capacitor-Current-Sensor Calibration of DC-DC Buck Converter with DVS for Accurately Accelerating Load-Transient Response. / Kuo, Tai-Haur; Huang, Yi Wei; Wang, Pai Yi.

2019 IEEE International Solid-State Circuits Conference, ISSCC 2019. Institute of Electrical and Electronics Engineers Inc., 2019. p. 430-432 8662296 (Digest of Technical Papers - IEEE International Solid-State Circuits Conference; 卷 2019-February).

研究成果: Conference contribution

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Kuo T-H, Huang YW, Wang PY. 27.6 Background Capacitor-Current-Sensor Calibration of DC-DC Buck Converter with DVS for Accurately Accelerating Load-Transient Response. 於 2019 IEEE International Solid-State Circuits Conference, ISSCC 2019. Institute of Electrical and Electronics Engineers Inc. 2019. p. 430-432. 8662296. (Digest of Technical Papers - IEEE International Solid-State Circuits Conference). https://doi.org/10.1109/ISSCC.2019.8662296