Wireless Power Rectifier Bias Control for Phase Matching
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Solution Overview
Problem
Wireless charging systems face efficiency issues due to phase differences between voltage and current in the power provided to rectifiers, leading to reduced power conversion efficiency when the coupling coefficient or mutual inductance between the charging device and the electronic device changes, such as with varying distances.
Innovation Solution
An electronic device with a resonance circuit, rectification circuit, and control circuit that identifies phase differences between voltage and current and adjusts the bias voltage of transistors in the rectification circuit to perform impedance matching, thereby controlling the phase difference and enhancing power conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the coupling coefficient or mutual inductance between the charging device and the electronic device changes (e.g., with varying distances), then wireless charging functionality is maintained, but a phase difference occurs between voltage and current in the power provided to the rectifier, reducing power conversion efficiency
Solution Approach 1:
The patent applies dynamics by making the rectification circuit adaptable to changing coupling conditions. The control circuit dynamically adjusts the operation of the rectification circuit based on detected phase differences, allowing the system to maintain optimal power conversion efficiency across varying distances and coupling coefficients between the charging device and electronic device
Solution Approach 2:
The patent changes operational parameters of the rectification circuit in response to varying coupling conditions. By detecting phase differences and adjusting rectification parameters accordingly, the system optimizes power conversion efficiency while maintaining wireless charging functionality across different coupling scenarios
2Power
If a phase difference occurs between voltage and current in the power provided to the rectifier, then wireless power transmission is maintained, but power conversion efficiency is reduced
Solution Approach 1:
The patent implements feedback by having the control circuit detect the phase difference between voltage and current in the power provided to the rectifier. Based on this feedback information, the control circuit adjusts the operation of the rectification circuit to minimize phase differences and optimize power conversion efficiency while maintaining wireless power transmission
Solution Approach 2:
The system performs self-optimization by automatically detecting phase differences and adjusting its own rectification parameters without external intervention. The control circuit monitors the power transmission state and autonomously modifies rectification circuit operation to maintain optimal efficiency
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 effectively mitigates phase-related efficiency losses by dynamically adjusting the bias voltage of transistors, ensuring stable and efficient power conversion from AC to DC, even with changes in the charging environment.
Implementation Method 1
the battery of the power receiving unit may be charged by electromagnetic induction or electromagnetic resonance between the transmission coil of the power transmitting unit and the reception coil of the power receiving unit
Implementation Method 2
the battery of the power receiving unit may be charged by electromagnetic induction or electromagnetic resonance between the transmission coil of the power transmitting unit and the reception coil of the power receiving unit
Implementation Method 3
a rectification circuit including a plurality of transistors and configured to rectify AC power provided from the resonance circuit into DC power
Data Source
AI summary
An electronic device may include: a resonance circuit including a battery, a coil, and a capacitor, and configured to receive power wirelessly; a rectifying circuit including multiple transistors, and configured to rectify alternating current power provided from the resonance circuit into direct current power; and a control circuit, wherein the control circuit is configured to: identify a difference between the phase of voltage and the phase of current of the alternating current power provided from the resonance circuit during wireless reception of power from an external electronic device; and perform impedance matching by controlling the bias voltage of at least one of the multiple transistors on the basis that the difference between the phase of voltage and the phase of current satisfies a designated condition.