Free-Resonance Analog Ping for Wireless Power Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless charging systems using inductive coupling face inefficiencies and false positives due to the susceptibility of analog ping techniques to foreign objects, leading to power wastage and inaccurate detection of wireless receivers.
Innovation Solution
A method involving a wireless transmitter that performs an analog ping to tentatively determine the presence of a wireless receiver by sampling voltage levels during a resonant phase, followed by a digital ping for confirmation, utilizing a resonant circuit and controller to differentiate between the receiver and foreign objects based on resonant amplitude or frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If analog ping techniques are used to detect wireless receiver presence, then power consumption is reduced compared to digital ping techniques, but false positive determinations occur when foreign objects are detected
Solution Approach 1:
The detection process is segmented into two distinct phases: an initial analog ping phase for quick, low-power presence detection, followed by a digital ping confirmation phase to verify the detection and eliminate false positives. This segmentation allows the system to benefit from the low power consumption of analog ping while mitigating its false positive problem through the added verification step.
Solution Approach 2:
The digital ping acts as an intermediary verification step between the analog ping detection and the actual wireless charging activation. This intermediary process confirms whether the analog ping detection was accurate before committing to the higher-power charging operation, thus reducing false positives while maintaining overall low power consumption.
2Reliability
If digital ping techniques are used to confirm wireless receiver presence, then detection accuracy is improved, but power consumption increases significantly
Solution Approach 1:
The analog ping is performed as a preliminary action before the digital ping confirmation. This preliminary low-power detection filters out cases where no receiver is present, allowing the system to skip the high-power digital ping in those cases and only perform digital ping when the analog ping indicates possible presence, thus reducing overall power consumption while maintaining accuracy.
Solution Approach 2:
The system performs only the necessary level of detection action: analog ping alone when sufficient for initial screening, and digital ping only when needed for confirmation. This partial action approach avoids the excessive power consumption of always performing digital ping while maintaining detection accuracy when required.
3Ease of operation
If inductive coupling is used for wireless power transmission, then power can be transferred wirelessly to portable devices, but energy transfer efficiency is low due to magnetic field loss
Solution Approach 1:
The system dynamically adjusts the detection and charging process based on real-time conditions. By using analog ping to continuously monitor for receiver presence and adjust charging activation accordingly, the system optimizes energy transfer efficiency by avoiding unnecessary charging cycles and reducing magnetic field energy loss when no receiver is present.
Solution Approach 2:
The dual-ping system provides feedback mechanisms to optimize energy transfer. The analog ping provides initial feedback on receiver presence, and the digital ping provides confirmation feedback, allowing the system to make informed decisions about activating wireless charging only when needed, thus improving overall energy transfer 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
This approach reduces power consumption and minimizes false positives by accurately determining the presence of a wireless receiver, ensuring efficient energy transfer and reducing unnecessary charging cycles.
Implementation Method 1
a resonant circuit enters a free-resonance state of a resonating phase that follows the energizing phase
Implementation Method 2
A wireless charging system usually includes electromagnetically coupled transmitting and receiving coils. Energy from the primary side is transferred to the secondary side over a distance using the coil coupling.
Data Source
AI summary
A wireless transmitter wirelessly charges/powers a wireless receiver. The transmitter performs an analog ping to tentatively detect a device. During an energizing phase of the analog ping, the transmitter applies power pulses to a resonant circuit within the transmitter, where, after application of the power pulses, the resonant circuit enters a free-resonance state of a resonating phase of the analog ping that follows the energizing phase. During the resonating phase, while the resonant circuit is in the free-resonance state, the transmitter samples voltage within the resonant circuit to generate one or more voltage-level samples. The transmitter processes the voltage-level samples to tentatively detect the device. If a device is tentatively detected then the transmitter performs a digital ping to definitively determine whether the device is present. If definitively detected then the transmitter wirelessly charges/powers the wireless receiver.