Buck converter with switched capacitor charge compensation for fast transient response

Wanxin Zhou; Kezhu Song; Chuan Wu; Chengyang Zhu; Dongyi Xie

Buck converter with switched capacitor charge compensation for fast transient response

Vol. 24, No. 8, pp. 1320-1328, Aug. 2024

10.1007/s43236-024-00838-w

Abstract

As microprocessor currents exceed 500 A and slew rate reaches 1000 A/μs, increasing the decoupling capacitance on the motherboard to ensure normal operation of the microprocessor is inevitable because of the limited response capability of the voltage regulator. However, the area of the motherboard used for capacitors is usually narrow. To reduce the required capacitance, a novel buck converter with an auxiliary circuit for charge compensation using switched capacitors is proposed. The auxiliary circuit is not activated during the steady state. When the load current changes rapidly, the switched capacitors can quickly absorb or release charge to suppress voltage fluctuations. A 12 V–0.9 V buck converter has been built and tested under a 480 A load current step and a 960 A/μs current slew rate. The proposed scheme with 9.964 mF capacitance has an overshoot of 115 mV and an undershoot of 89 mV. Compared with the conventional PID scheme, the proposed scheme can save 58.4% of the capacitance for the same voltage fluctuations or suppress 39.5% of overshoot and 37.3% of undershoot with the same capacitance.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

W. Zhou, K. Song, C. Wu, C. Zhu, D. Xie, "Buck converter with switched capacitor charge compensation for fast transient response," Journal of Power Electronics, vol. 24, no. 8, pp. 1320-1328, 2024. DOI: 10.1007/s43236-024-00838-w.

[ACM Style]

Wanxin Zhou, Kezhu Song, Chuan Wu, Chengyang Zhu, and Dongyi Xie. 2024. Buck converter with switched capacitor charge compensation for fast transient response. Journal of Power Electronics, 24, 8, (2024), 1320-1328. DOI: 10.1007/s43236-024-00838-w.