Synchronous Rectifier Delay Compensation for Wireless Power
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Solution Overview
Problem
Current wireless power transmission systems face inefficiencies in converting alternating current (AC) to direct current (DC) for efficient power delivery, particularly in wireless charging applications, due to delays in switching units and the need for separate fabrication processes for rectifier controllers and switching units.
Innovation Solution
A synchronous rectifier system with discrete power transistors and a rectifier controller that compensates for switching unit delays, along with a DC/DC converter, is used to efficiently convert AC to DC power, where the rectifier controller and DC/DC controller are fabricated on a single chip, and the switching elements are discrete off-chip components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If synchronous rectifier uses discrete power transistors with separate fabrication process, then manufacturing flexibility is improved, but device complexity increases
Solution Approach 1:
The rectifier controller is segmented into a separate integrated circuit chip from the discrete power transistors. This allows the controller to be fabricated using standard IC processes while the power transistors can be selected as discrete components, combining the advantages of both approaches and resolving the contradiction between manufacturing flexibility and device complexity.
2Productivity
If rectifier controller compensates for switching unit delays, then power conversion efficiency is improved, but control complexity increases
Solution Approach 1:
The rectifier controller incorporates delay compensation mechanisms that proactively adjust switching timing based on predetermined delay characteristics of the discrete power transistors. By pre-calculating and compensating for delays before they affect performance, the system achieves high efficiency without requiring complex real-time adjustments.
3Productivity
If AC to DC conversion process is optimized, then power delivery efficiency is improved, but conversion time increases
Solution Approach 1:
The synchronous rectifier maintains continuous power conversion operation by overlapping the switching cycles of the discrete power transistors with the control signals from the rectifier controller. This ensures that the AC to DC conversion process operates continuously without interruption or idle periods, achieving both high efficiency and fast conversion.
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 enhances the efficiency of AC to DC conversion, improving power delivery in wireless charging systems by minimizing delays and optimizing fabrication processes, leading to stable and efficient charging operations.
Implementation Method 1
a synchronous rectifier configured to rectify an alternating current (AC) input power to generate a direct current (DC) power
Implementation Method 2
Wireless power is energy that is transmitted from a wireless power transmission (WPT) apparatus to a wireless power reception apparatus through magnetic coupling
Implementation Method 3
WPT based on a resonance scheme provides a high degree of freedom in terms of positions of the source device and the target device
Data Source
AI summary
An apparatus and a method for wireless power reception include converting a received wireless power to a wireless power for charging using a synchronous rectifier and a direct current/direct current (DC/DC) converter having a structure providing a high efficiency and low heat generation even when a high charging current is supplied.