Scalable SCIB Regulator for High-Conversion Step-Down
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Solution Overview
Problem
The challenge lies in efficiently stepping down high input voltages, such as 54V, to lower voltage levels like 3-15V for data center applications while maintaining similar transient performance and footprint as traditional 12V solutions, which is complicated by increased power demands and energy consumption in hyperscale data centers.
Innovation Solution
A scalable switched capacitor integrated buck (SCIB) regulator is implemented, utilizing series and parallel switch circuits to step down input voltage with a fixed ratio, incorporating DC shift switch circuits for voltage compensation, and buck regulator circuits to generate a regulated output voltage, allowing for efficient power delivery without transformers and enabling scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional 12V power architecture is used, then transient performance and footprint are maintained, but distribution loss increases and power delivery efficiency decreases
Solution Approach 1:
The power conversion process is segmented into two distinct stages: a switched-capacitor stage for high-voltage to intermediate-voltage conversion (54V to 15V), and a traditional buck converter stage for intermediate-voltage to low-voltage conversion (15V to 1.8V). This segmentation allows each stage to operate optimally, with the SC stage handling the high conversion ratio efficiently and the buck stage providing precise voltage regulation, thereby reducing overall distribution loss while maintaining manageable complexity through modular design
Solution Approach 2:
An intermediate voltage rail (15V) is introduced as a mediator between the high input voltage (54V) and the low output voltage (1.8V). The first SC stage converts 54V to 15V, and the second buck stage converts 15V to 1.8V. This intermediary voltage level enables more efficient power conversion by avoiding direct high-ratio conversion, reducing energy loss while the modular two-stage architecture keeps system complexity manageable
2Productivity
If high conversion ratio step-down (54V to 3-15V) is implemented, then power delivery efficiency improves, but maintaining transient performance and footprint becomes challenging
Solution Approach 1:
The power conversion system is divided into two specialized stages: the first SC stage optimized for high-voltage to intermediate-voltage conversion with high efficiency, and the second buck stage optimized for intermediate-voltage to low-voltage conversion with excellent transient response. By segmenting the conversion process, each stage can be independently optimized for its specific function, maintaining high power delivery efficiency while ensuring reliable transient performance through the buck stage's inherent fast response characteristics
Solution Approach 2:
The 15V intermediate rail acts as a buffer that isolates the transient variations between the high-voltage input and low-voltage output. The first SC stage handles the bulk voltage conversion efficiently, while the second buck stage, with its fast transient response, precisely regulates the final output voltage. This intermediary approach maintains both high power delivery efficiency and reliable transient performance by distributing the conversion challenges across two specialized stages
3Productivity
If switched capacitor circuits are used for high-frequency operation, then power delivery efficiency improves, but component count and cost increase
Solution Approach 1:
The patent merges the advantages of switched-capacitor circuits (high-frequency operation, high efficiency) with traditional buck converters (precise regulation, fewer components for high conversion ratios). The first stage uses SC circuits for efficient high-voltage to intermediate-voltage conversion, while the second stage uses a buck converter for efficient intermediate-voltage to low-voltage conversion. This hybrid approach achieves high power delivery efficiency without requiring a large number of SC components throughout the entire conversion chain, thereby reducing overall component count and cost
4Loss of energy
If 54V distribution bus is adopted, then energy density increases and copper backplane requirements are reduced, but board-level voltage conversion becomes more challenging
Solution Approach 1:
The board-level voltage conversion is segmented into two manageable stages: the first SC stage handles the challenging high-voltage to intermediate-voltage conversion (54V to 15V) with optimized high-voltage components and safety features, while the second buck stage handles the intermediate-voltage to low-voltage conversion (15V to 1.8V) with standard components. This segmentation reduces board-level conversion complexity by breaking down the challenging single-stage high-ratio conversion into two easier-to-implement stages, while maintaining the energy density benefits of the 54V distribution bus
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces distribution loss and allows for high-frequency operation with easy scalability, generating regulated low output voltages like 5V and 1.8V, reducing component count and cost while maintaining voltage and current variants, thus addressing the inefficiencies in traditional power architectures.
Implementation Method 1
switched capacitor integrated buck (SCIB) regulator
Data Source
AI summary
Described herein is a technology for implementing a scalable SCIB regulator for high conversion step down application. Particularly, the SCIB is configured to include stacked input switch circuits with parallel-connected output switch circuits. The input switch circuits are stacked with or without DC shift switch circuits in between. Furthermore, the input voltage is stepped down to a biasing voltage by input switch circuits and then is regulated to one or more output voltages having one or more independent and predetermined values by output switch circuits. The input switch circuits, output switch circuits and DC shift switch circuits can be modified for scalable power capability and ease of control and manufacturing.