Wireless Power Transmitter Beacon Mode Wake-Up Mechanism
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies in waking a transmitter from a low power mode, particularly in detecting the presence of a receiver device to switch from a low power beacon mode to a higher power mode, which can lead to prolonged power consumption and delayed charging.
Innovation Solution
A wireless power receiver apparatus and method that adjusts its load characteristic using wirelessly received power to cause a detectable change in the transmitter's operating characteristic, allowing the transmitter to switch from a low power beacon mode to a higher power mode efficiently, even when the receiver has no other power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the transmitter operates in low power beacon mode to conserve energy, then power consumption is reduced, but the ability to detect receiver presence and initiate charging is delayed
Solution Approach 1:
The transmitter performs preliminary actions by periodically transmitting beacon signals at low power to prepare for potential receiver presence. When a receiver is detected, the system has already been in a ready state, eliminating detection delays while maintaining low power consumption during idle periods.
Solution Approach 2:
The transmitter dynamically adjusts its operating state between low power beacon mode and high power charging mode based on receiver presence detection. This dynamic transition allows the system to optimize power consumption during idle periods while ensuring rapid response when charging is needed.
2Productivity
If the transmitter continuously monitors for receiver presence at high power level, then charging can start immediately, but power consumption increases significantly
Solution Approach 1:
Instead of continuous high-power monitoring, the transmitter uses periodic low-power beacon signals to detect receiver presence. This periodic approach maintains charging initiation capability while dramatically reducing average power consumption compared to continuous high-power operation.
Solution Approach 2:
The system uses the beacon signals themselves to carry detection information, eliminating the need for separate high-power monitoring operations. The same low-power beacon transmission serves both as a presence indicator and as the detection mechanism.
3Measurement precision
If the beacon signal strength is increased to improve receiver detection reliability, then detection accuracy improves, but power consumption increases
Solution Approach 1:
The system uses feedback from receiver responses to beacon signals to confirm presence and establish charging parameters. This feedback mechanism allows reliable detection at low power levels by confirming receiver identity and intent rather than relying solely on signal strength.
Solution Approach 2:
The transmitter changes operational parameters by using modulated beacon signals with specific frequencies and patterns that enable reliable detection at low power levels. The receiver identifies these specific parameter patterns to confirm presence, allowing accurate detection without high signal strength.
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 rapid detection of the receiver's presence and efficient transition to higher power transmission, minimizing beacon signal strength while ensuring timely and effective charging, thus optimizing power usage and charging speed.
Implementation Method 1
a transmit circuit including a transmit coil configured to wirelessly transmit power
Implementation Method 2
a receive circuit including a receive coil configured to wirelessly receive power
Data Source
AI summary
This disclosure provides systems, methods and apparatus for waking a wireless power transmitter from beacon mode. In one aspect a wireless power receiver apparatus is provided. The wireless power receiver apparatus includes a receive circuit comprising a receive coil. This receive circuit is coupled to a load. The receive circuit is configured to wirelessly receive power from a transmitter device at a first power level to power the load. The wireless power receiver apparatus further includes an adjustment circuit configured to be powered by using the wirelessly received power. The adjustment circuit is further configured to adjust a characteristic of the load using the wirelessly received power for a period of time to cause a detectable change in an operating characteristic of the transmitter device for the period of time.