[1] [1] PEDRAM M. Energy-efficient datacenters ［J］. IEEE TransComput Aided Des Integr Circ & Syst, 2012, 31(10): 1465-1484.

[2] [2] TAN K, SONG X, PENG C, et al. Hierarchical protection architecture for 380 V DC data center application ［C］// IEEE Energy Conver Congress and Exposi. Milwaukee, WI, USA. 2016: 1-8.

[3] [3] KIRSHENBOIM O, PERETZ M M. High-efficiency non-isolated converter with very high step-down conversion ratio ［J］. IEEE Trans Power Elec, 2017, 32(5): 3683-3690.

[4] [4] AHMED M, FEI C, LEE F C, et al. High-efficiency high-power-density 48/1 V sigma converter voltage regulator module ［C］// IEEE Appl Power Elect Conf Exposition. Tampa, FL, USA. 2017: 2207-2212.

[5] [5] LEEF C, LI Q. High-frequency integrated point-of-load converters: overview ［J］IEEE Trans Power Elec, 2013, 28(9): 4127-4136.

[6] [6] LI Y, LYU X, CAO D, et al. A 98.55% efficiency switched-tank converter for data center application ［J］. IEEE Trans Indus Applic, 2018, 54(6): 6205-6222.

[7] [7] Texas Instruments. Using the LMG5200POLEVM-10A GaN 48 V-1 V point-of-load EVM, LMG5200POLEVM-10A user’s guide, Rev. B ［Z］. 2017.

[8] [8] PARK H, KIM M, JUNG J. Spread spectrum technique to reduce EMI emission for an LLC resonant converter using a hybrid modulation method ［J］. IEEE Trans Power Elec, 2018, 33(5): 3717-3721.

[9] [9] ZENG J, ZHANG G, YU SS, et al. LLC resonant converter topologies and industrial applications — a review ［J］. Chin J Electr Eng, 2020, 6(3): 73-84.

[13] [13] CHOI M, JEONG D K. A 92.8%-peak-efficiency 60 A 48 V-to-1 V 3-level half-bridge dc-dc converter with balanced voltage on a flying capacitor ［C］// IEEE Int Sol Sta Circ Conf (ISSCC). San Francisco, CA, USA. 2020: 296-298.