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Friday, March 15 • 8:20am - 8:38am
Google 48V Rack Adaptation and Onboard Power Technology Update

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Overview As disclosed in OCP 2016 keynote, Google rack power utilizes direct current 48V. In 2017, Google contributed the Open Rack V2 48V spec to help the development of 48V rack and power components. In 2018 OCP, to further develop the 48V ecosystem, Google shared project “Flatbed” which is an adapter board and specifications to integrate 12V motherboards to a 48V rack. We also shared a new on-board 2-stage 48V to PoL voltage conversion approach to improve Total cost of ownership (TCO). For 2019 OCP, we like to present the toolkit to integrate AC-based chassis into 48V rack and new progress for on-board 48V power conversion. AC-12V based PSU to DC/DC PDB Approach The OTS (Off The Shelf or enterprise) payloads are designed to take AC as input with the traditional 2 conversion UPS in the data center level, and it often requires certain hold up time (15ms to 20ms) and N+N redundancy to meet the availability target and repair process requirement. To optimize the power delivery system, many data center consumers have already moved to a centralized rack power delivery architecture which have the battery in the rack or tray level. The challenges of accommodating the OTS payloads into centralized rack power delivery system become very obvious because of the power architecture difference. In this workshop, we are going to show one approach to smoothly integrate the AC-based chassis OTS payloads into 48V centralized power system to meet a critical TTM target with a simple toolkit. This approach has been enabled by simplifying the power requirements in hold up time, redundancy, narrow input range, modularized design and so on. Onboard power In terms of 48V onboard power delivery, Google has been continuously driving the technologies toward higher efficiency, higher density, better scalability and cost effectiveness to meet the rapidly increasing data center computing power demand. Our technologies address a variety of use cases across server, storage, networking and AI accelerators. Significant progress has been made in these specific applications: 1. multi-phase 48V-to-12V voltage regulators adopting the latest hybrid switched-capacitor-buck topologies for traditional 12V workloads such as PCIEs and OTS servers; 2. very high efficiency high density fixed ratio bus converters for 2-stage 48V-to-PoL power conversions; 3. high frequency high density voltage regulators for extremely power hungry AI accelerators. A complete onboard 48V power solution portfolio is explored in this workshop.


Shuai Jiang


Xin Li

Technical Lead Manager at Google Platforms, Google

Friday March 15, 2019 8:20am - 8:38am PDT
210 BF