Transformer Layout and Current Sampling in 48V Power Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing power requirements of artificial intelligence data processing chips, such as CPUs, GPUs, and TPUs, lead to higher power consumption on server mainboards, necessitating more efficient power conversion with higher power density and conversion efficiency in server systems, particularly with 48V power supply voltage and two-stage buck circuit architectures.
Innovation Solution
A power conversion device is designed with an optimized layout and driving circuit, incorporating a transformer assembly, switch, output capacitor, and driving unit, which includes a three-switch bridge arm configuration and current sampling scheme to enhance efficiency and comprehensive current detection, enabling overcurrent protection and current sharing across multiple devices using time division multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power supply voltage is increased to 48V to meet higher power requirements, then the power delivery capability is improved, but the safety risks and electromagnetic interference increase
Solution Approach 1:
The patent divides the single-stage power conversion into two-stage buck circuit architecture, segmenting the voltage conversion process into intermediate conversion (48V to intermediate voltage) and final conversion (intermediate voltage to output voltage). This segmentation reduces the voltage stress on individual components and lowers electromagnetic interference while maintaining high power delivery capability.
Solution Approach 2:
The patent introduces an intermediate bus conversion device as a mediator between the 48V input and the output, using an intermediate voltage level to facilitate safer and more efficient power conversion. This intermediary approach reduces direct high-voltage stress on downstream components and improves overall system safety.
2Power
If the power density is increased to meet higher power requirements, then the power delivery capability is improved, but the heat dissipation challenges and component stress increase
Solution Approach 1:
The two-stage buck circuit architecture segments the power conversion process, distributing heat generation across two separate conversion stages rather than one concentrated stage. This reduces peak temperature at any single point and improves heat dissipation management while maintaining high power density.
Solution Approach 2:
The patent changes the voltage parameters through intermediate conversion, operating at optimized voltage levels in each stage to improve conversion efficiency and reduce power losses that would otherwise manifest as heat. This parameter optimization enables high power density with better thermal management.
3Loss of energy
If the conversion efficiency is increased to reduce power losses, then the energy efficiency is improved, but the circuit complexity and component requirements increase
Solution Approach 1:
The patent segments the power conversion into two stages, where each stage can be optimized for its specific voltage conversion ratio. This segmentation enables higher overall conversion efficiency by avoiding extreme voltage ratios in a single stage, while the modular nature of the segmentation keeps each stage's complexity manageable.
Solution Approach 2:
The intermediate bus conversion device serves multiple functions: voltage conversion, power isolation, and enabling flexible output voltage configurations. This multi-functionality justifies the added complexity by delivering superior conversion efficiency and system flexibility simultaneously.
4Area of stationary object
If the number of pins is reduced for compact design, then the device size is reduced, but the current detection and control capabilities are limited
Solution Approach 1:
The patent makes the limited pins multi-functional by implementing time-division multiplexing where pins serve multiple purposes: current detection, control signals, and communication. The intermediate bus conversion device enables comprehensive current detection through its bridge arm configuration, allowing accurate measurement despite pin constraints.
Solution Approach 2:
The patent uses periodic switching of the bridge arms in time-division multiplexed fashion to achieve multiple functions through limited pins. By periodically alternating between different operational modes and measuring at different time intervals, the system achieves comprehensive current detection and control with fewer physical pins.
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 configuration improves conversion efficiency, reduces turn-off losses, and achieves comprehensive current detection and overcurrent protection, allowing for efficient power management and current sharing in high-power AI data processing applications with limited pins through advanced control signals and layouts.
Implementation Method 1
a transformer assembly (4), switch (100), output capacitor (200)... The transformer area, the switch area, the output capacitor area and the first port area are arranged in the same direction.
Data Source
AI summary
The application discloses a power conversion device. The power conversion device comprises a transformer assembly, a switch, an output capacitor and a driving unit, and the conversion efficiency of the power conversion device is optimized; On the other hand, the application discloses a layout of the power conversion device; The layout comprises a transformer area, a switch area, an output capacitor area and a port area layout, and the conversion efficiency of the power conversion device is further improved through reasonable layout; and on the other hand, the application discloses a current sampling scheme suitable for the power conversion device is disclosed, and a control pin is multiplexed in a time-sharing mode, so that comprehensive detection and monitoring of the current of the power conversion device and the current sharing function of the plurality of power conversion devices in parallel application are achieved.