Wireless Power Receiver Dual Induction Coil Rectification
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Solution Overview
Problem
Existing wireless power transmission systems using resonance face limitations in reducing power loss when converting AC power to DC power in wireless power receivers, which also results in increased circuit size and cost due to the number of rectifying diodes required.
Innovation Solution
A wireless power receiver design that utilizes two reception induction coils and two rectifying diodes, where either diode rectifies AC power based on polarity variations, allowing power transfer through different loops, thereby reducing the number of diodes needed and improving rectifying efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional rectifying circuits are used to convert AC power to DC power in wireless power receivers, then power conversion is achieved, but power loss increases and rectifying efficiency decreases
Solution Approach 1:
The patent employs two reception induction coils with different orientations (first coil for vertical magnetic field, second coil for horizontal magnetic field) that dynamically adapt to different polarities of AC power. The system selectively activates appropriate coils based on polarity conditions, enabling dynamic optimization of power reception and reducing losses during rectification.
Solution Approach 2:
The invention changes the configuration parameters of the reception system by using two induction coils with different spatial orientations and connecting them in different configurations (series/parallel) depending on AC power polarity. This parameter adaptation optimizes the coupling efficiency with the transmission coil, thereby reducing power loss during conversion.
2Reliability
If more rectifying diodes are used to ensure proper rectification of AC power, then rectification reliability improves, but device complexity and circuit size increase
Solution Approach 1:
The patent segments the rectification function into two independent paths: one path using the first reception induction coil and first rectifying diode for vertical polarity, and another path using the second reception induction coil and second rectifying diode for horizontal polarity. This segmentation allows each diode to operate optimally in its designated polarity condition, maintaining reliability while reducing the need for more complex multi-diode configurations.
Solution Approach 2:
Each reception induction coil is designed to serve multiple functions: the first coil handles vertical magnetic field polarity while the second coil handles horizontal magnetic field polarity. This multi-functionality approach ensures comprehensive rectification coverage for all AC power polarities using only two diodes, rather than requiring more diodes for each specific polarity condition.
3Productivity
If two reception induction coils are used to handle different polarities of AC power, then power transmission efficiency is maximized, but device complexity increases
Solution Approach 1:
The patent introduces asymmetry in the coil configuration by using two induction coils with different spatial orientations (vertical and horizontal) rather than identical symmetric coils. This asymmetric design allows optimal coupling with transmission coils of different polarities, maximizing power transmission efficiency. The asymmetric configuration is controlled by polarity detection circuits that selectively activate appropriate coil pairs.
Solution Approach 2:
The system employs periodic action through polarity detection and switching mechanisms that periodically alternate between different coil configurations based on the AC power polarity. The control circuit detects polarity changes and periodically switches between series and parallel connections of the coils, ensuring optimal efficiency for each polarity cycle while managing device complexity through automated periodic switching.
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 maximizes power transmission efficiency, reduces power loss during AC to DC conversion, decreases the number of rectifying diodes, and consequently lowers the overall circuit size and cost.
Implementation Method 1
a wireless power receiver to transfer power wirelessly received from a wireless power transmitter to a load, wherein the wireless power receiver includes a first reception induction coil coupled with a reception resonant coil to receive AC power
Implementation Method 2
a first rectifying diode to rectify the AC power received through the first reception induction coil; a second rectifying diode to rectify the AC power received through the second reception induction coil
Data Source
AI summary
Disclosed is a wireless power receiver to transfer power wirelessly received from a wireless power transmitter to a load. The wireless power receiver includes a first reception induction coil coupled with a reception resonant coil to receive AC power; a first rectifying diode to rectify the AC power received through the first reception induction coil; a second reception induction coil connected to the first reception induction coil and coupled with the reception resonant coil to receive the AC power; and a second rectifying diode to rectify the AC power received through the second reception induction coil, wherein the wireless power receiver changes a transferring path of the power provided to the load according to a polarity variation of the AC power received through the first and second reception induction coils.