Magnetic Assembly and Clamping Circuit for Compact Power Conversion
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Solution Overview
Problem
The increasing power requirements of artificial intelligence data processing chips, such as XPU, lead to higher power consumption and voltage demands in server systems, necessitating more efficient power conversion with higher power density and conversion efficiency, particularly in two-stage buck circuit architectures.
Innovation Solution
A power conversion device with a specific circuit topology and control strategy, including switch bridge arms and control signals, along with a magnetic assembly design, to reduce losses and improve efficiency, featuring parallel switching devices and a clamping circuit for voltage stabilization and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power consumption of AI chips increases, then the power density requirement increases, but the size of the power conversion device increases
Solution Approach 1:
The power conversion device is divided into multiple switch bridge arms (first switch bridge arm and second switch bridge arm), each handling a portion of the power conversion task. This segmentation allows the device to achieve high power density through parallel processing while keeping individual component sizes manageable, directly addressing the contradiction between power density and device size.
2Productivity
If the switching frequency increases to improve conversion efficiency, then the conversion efficiency improves, but the loss of switching tubes increases
Solution Approach 1:
The patent employs periodic switching control where each switch bridge arm operates in alternating cycles. The control signals are configured such that when one bridge arm is switching, the other is in steady state, and vice versa. This periodic action distributes switching losses over time and allows for optimized switching frequencies that maintain high conversion efficiency while managing switching tube losses effectively.
3Power
If the number of switch bridge arms increases to handle higher power, then the power handling capability increases, but the device complexity increases
Solution Approach 1:
The patent combines multiple switch bridge arms into a unified power conversion system with shared control logic and magnetic components. The first and second switch bridge arms are integrated with common control signals and coordinated switching, allowing the system to handle higher power levels while managing complexity through modular design and shared resources rather than completely separate circuits.
4Power
If the voltage conversion ratio is increased to meet AI chip requirements, then the voltage conversion capability improves, but the conversion efficiency decreases
Solution Approach 1:
The patent implements dynamic voltage conversion where the duty cycle and switching parameters of each bridge arm are continuously adjusted based on the required output voltage and load conditions. This dynamic control allows the system to maintain high conversion efficiency across a wide range of voltage conversion ratios by optimizing the operating point in real-time, rather than being fixed at a single conversion ratio.
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
The solution enhances power conversion efficiency, reduces size and losses, and maintains stable output voltage, effectively addressing the high power demands of AI data processing chips while minimizing thermal and current stress on switching devices.
Implementation Method 1
A magnetic assembly, comprising a first winding, a second winding, a transformer magnetic core and an inductance magnetic core
Data Source
AI summary
A power conversion circuit and a magnetic assembly are provided. The magnetic assembly comprises a transformer magnetic core, an inductance magnetic core, a first winding and a second winding, and discloses a winding method of the first winding and the second winding. On the other hand, an auxiliary power supply circuit is provided. When the output voltage of the power conversion circuit does not reach the steady-state working voltage or the power conversion circuit is in a standby state, power supply is provided for the MCU and the power management bus. On the other hand, the application provides a power switch VDS voltage clamping protection circuit suitable for a power conversion circuit. The application of the small-size compact power conversion device can be realized, the loss of the power conversion device is reduced, and the conversion efficiency is improved.