Wireless Power Receiver Correction Circuit
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Solution Overview
Problem
Existing wireless power supply systems, such as those conforming to the Qi standard, face inefficiencies and foreign object detection challenges due to variations in electric power reception affected by the structure and material of the reception coil and device housing, leading to inaccurate power consumption calculations.
Innovation Solution
A control circuit for wireless power receiving apparatuses that calculates received electric power with high precision using correction parameters optimized for the reception coil and device housing, incorporating a received power calculation unit, parameter acquisition unit, and correction unit to adjust for variations in power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standard wireless power supply system conforming to the Qi standard is used, then power transmission can be achieved through electromagnetic induction, but measurement precision of received electric power deteriorates due to variations in reception coil structure and device housing
Solution Approach 1:
The patent applies parameter changes by introducing correction parameters (α and β) that adjust the relationship between power consumption and received electric power. These parameters are optimized based on the reception coil structure and housing material, allowing the system to adapt to different configurations while maintaining high measurement precision through the correction formula: received electric power = α × power consumption + β
Solution Approach 2:
The patent applies local quality by optimizing correction parameters specifically for each reception coil structure and housing material combination. Instead of using a universal measurement approach, the system tailors the correction parameters to local characteristics of each device configuration, thereby achieving high precision measurements across diverse hardware variations
2Measurement precision
If correction parameters are optimized for specific reception coil and housing configurations, then measurement precision of received electric power is improved, but device complexity increases due to parameter acquisition and correction mechanisms
Solution Approach 1:
The patent applies preliminary action by pre-optimizing correction parameters (α and β) for different reception coil and housing configurations before actual power reception. The parameters are stored in advance and selected based on the specific device configuration, eliminating the need for complex real-time calculations and reducing operational complexity while maintaining high precision
Solution Approach 2:
The patent applies feedback by using the calculated power consumption and the correction parameters to determine the received electric power. The control circuit continuously monitors power consumption and applies the correction formula to compensate for losses, creating a feedback mechanism that maintains measurement accuracy without requiring overly complex hardware
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
Enables accurate detection of received electric power and improved foreign object detection by optimizing correction parameters based on the reception coil and device housing, enhancing power supply efficiency and precision.
Implementation Method 1
The wireless power supply that conforms to the Qi standard uses electromagnetic induction between a transmission coil and a reception coil
Data Source
AI summary
A power receiving apparatus is configured including a control circuit together with a reception coil, a rectifier circuit, a smoothing capacitor, and a modulator. A received power calculation unit calculates an electric power consumption PD of the wireless power receiving apparatus based on a predetermined calculation expression. A parameter acquisition unit acquires a first parameter α and a second parameter β via an external component. A correction unit calculates a received electric power PRP of the wireless power receiving apparatus according to a correction expression PRP=α×PD+β.