Two-Stage Power Adapter for Dynamic Voltage Regulation
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Solution Overview
Problem
Existing power delivery systems for computing devices, such as laptops and smartphones, face challenges in efficiently adapting to varying voltage requirements and providing safe, isolated power while minimizing component complexity and cost.
Innovation Solution
A two-stage power adapter system that includes an electromagnetic interference (EMI) filter, an AC rectifier bridge, a step-down transformer, and a power delivery adapter controller, which receives input voltage and adjusts it through a buck converter to meet requested voltage levels, using feedback control to optimize output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage power conversion system is used, then device complexity is reduced, but adaptability to varying voltage requirements deteriorates
Solution Approach 1:
The power adapter is divided into two distinct stages: a first power conversion stage that performs initial voltage transformation and isolation, and a second power conversion stage that fine-tunes the voltage to the exact requested level. This segmentation allows each stage to specialize in specific functions, achieving both adaptability and manageable complexity.
Solution Approach 2:
The system dynamically switches between different power conversion modes based on the requested voltage. The controller determines whether to operate in first-stage-only mode or both-stage mode, allowing the adapter to adapt its complexity to the specific voltage requirements of the connected device.
2Reliability
If larger capacitors are used in the power conversion circuit, then reliability and voltage stability are improved, but device volume and cost increase
Solution Approach 1:
The capacitance requirements are segmented between two stages. The first stage uses smaller capacitors for initial voltage stabilization, while the second stage uses even smaller capacitors for final voltage refinement. This segmentation reduces the total capacitance required compared to a single-stage system, decreasing volume and cost while maintaining reliability.
Solution Approach 2:
The first stage performs partial voltage conversion to bring the input voltage close to the target voltage, reducing the burden on the second stage. This partial action allows the use of smaller capacitors in the second stage while still achieving the required voltage stability and reliability.
3Adaptability or versatility
If switching frequency is increased to improve voltage regulation, then adaptability improves, but energy loss and heat generation increase
Solution Approach 1:
The voltage regulation task is segmented into two stages. The first stage operates at a lower switching frequency for coarse voltage adjustment, while the second stage operates at a higher switching frequency for fine voltage tuning. This segmentation allows the system to achieve precise voltage regulation without requiring the entire system to operate at high frequency, thereby reducing overall energy loss and heat generation.
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 system efficiently adapts to different voltage requirements, ensures safety isolation, reduces component complexity, and improves dynamic performance by minimizing capacitor sizes and switching frequency, thus enhancing power delivery efficiency and safety.
Implementation Method 1
A two-stage power adapter system that includes an electromagnetic interference (EMI) filter
Implementation Method 2
an AC rectifier bridge, a first power stage including a step-down transformer
Implementation Method 3
a first power stage including a step-down transformer, the first power stage configured to receive the first voltage and output a second voltage
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
In one general aspect, a system can include an electromagnetic interference (EMI) filter, an alternating current (AC) rectifier bridge operatively coupled to the electromagnetic filter, the AC rectifier bridge providing a first voltage, a first power stage including a step-down transformer, the first power stage configured to receive the first voltage and output a second voltage, a second power stage configured to receive the second voltage and configured to convert the second voltage to a third voltage, and a power delivery adapter controller configured to receive at least one input indicative of a requested voltage value and configured to provide at least one output for use by the second power stage, the second power stage configured to determine a value for the third voltage based on the at least one output.