Wireless Power Reception Control for Sustained Output Mismatch
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Solution Overview
Problem
In wireless power transfer systems, it is difficult to determine whether a system error during power transfer is due to placement of a foreign object, device breakdown, or erroneous detection, leading to inappropriate power transfer control when power transmission stops.
Innovation Solution
The power reception device includes communication means to request power transfer output changes from the power transmission device when certain conditions are met, such as repeated or prolonged requests for increased output, enabling adaptive power transfer control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power transmission device stops power transfer when a system error occurs, then safety is improved, but power transfer efficiency deteriorates because appropriate control cannot be performed
Solution Approach 1:
The power reception device monitors the power transfer process and provides feedback by counting requests for power transfer output changes. When the count reaches a threshold, it transmits an error notification to the power transmission device, enabling the system to distinguish between temporary fluctuations and actual errors, thus allowing appropriate control decisions.
Solution Approach 2:
The power reception device acts as an intermediary that monitors and evaluates the power transfer state between the power transmission device and the load. It counts output change requests and determines whether to notify an error, serving as a mediator that enables intelligent control decisions based on accumulated information.
2Power
If the power reception device transmits frequent requests for power transfer output increase, then power transfer output is improved, but system stability deteriorates due to excessive communication overhead
Solution Approach 1:
Instead of transmitting power transfer output increase requests continuously or excessively, the power reception device uses periodic evaluation by counting requests. It only notifies an error when the count reaches a predetermined threshold, converting continuous monitoring into periodic action that maintains system stability.
Solution Approach 2:
The power reception device performs preliminary evaluation by counting the number of power transfer output change requests before actually notifying an error. This preliminary action filters out transient fluctuations and ensures that only significant, sustained conditions trigger error notifications, thereby maintaining system stability.
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 approach allows for effective power transfer control that adapts to the system's state, ensuring safe and efficient operation by distinguishing between normal and error conditions.
Implementation Method 1
a power receiving unit configured to wirelessly receive electric power from an power transmission device
Data Source
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AI summary
An power reception device 200 in a wireless power transfer system transmits a request for change of an power transfer output to an power transmission device 100 in a case where a target electric power is set (S1403). The request for change of an power transfer output includes difference information indicating a difference between a current operating point and a target operating point of the power reception device 200. The power reception device 200 determines whether a request for change including the difference information greater than a predetermined threshold value is transmitted to the power transmission device 100 a predetermined number of times or more or continuously for a predetermined time or longer (S1407, S1408). The power reception device 200 transmits a request for change in power transfer control (control such as stopping or limiting power transfer) to the power transmission device 100 according to the result of determination.