Burst Wireless Power Switching for Accessory Charging Surfaces
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Solution Overview
Problem
Existing wireless charging systems face challenges in efficiently detecting and switching between power transmission and reception modes, especially when an electronic device is coupled with a removable accessory, which can lead to suboptimal power transfer and detection of the charging surface.
Innovation Solution
The system employs a wireless power transmitting device that transmits power in bursts separated by sleep periods to detect the presence of a charging surface, allowing the electronic device to switch between power transmission and reception modes effectively, even when a removable accessory is attached, by using control circuitry to manage inverter and rectifier operations and communicate through in-band and out-of-band signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electronic device continuously transmits wireless power to the removable accessory, then power transfer efficiency is improved, but the ability to detect the charging surface and switch to receiving mode is degraded
Solution Approach 1:
The electronic device transmits power in periodic bursts with sleep periods in between, rather than continuously. During the sleep periods, the device can detect the charging surface and receive power from the wireless power transmitting device. This periodic transmission approach resolves the contradiction by allowing both efficient power transfer during burst periods and surface detection during sleep periods.
2Adaptability or versatility
If the electronic device operates in power transmitting mode, then it can charge the removable accessory, but it cannot simultaneously receive power from the wireless power transmitting device
Solution Approach 1:
The electronic device dynamically switches between power transmitting mode and power receiving mode based on real-time conditions. When a removable accessory is detected, it operates in transmitting mode to charge the accessory. When placed on a wireless power transmitting device, it switches to receiving mode. This dynamic adaptability allows the device to optimize power transfer in each scenario without energy loss.
Solution Approach 2:
The device periodically switches between transmitting and receiving modes, using brief intervals to detect the charging surface and transition between states. This periodic mode switching enables dual functionality while maintaining optimal power transfer efficiency in each operational state.
3Difficulty of detecting and measuring
If the electronic device uses burst transmission with sleep periods, then detection capability is improved, but continuous power delivery to accessory is reduced
Solution Approach 1:
The device uses periodic burst transmission with sleep periods, where power is delivered in concentrated bursts rather than continuously. This approach maintains adequate power delivery to the accessory while enabling detection during sleep periods. The burst timing and duration are optimized to balance detection capability with power delivery requirements.
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 ensures efficient power transfer and detection, allowing the electronic device to seamlessly switch modes and maintain accessory charging, even when attached to a removable accessory, optimizing power utilization and system compatibility.
Implementation Method 1
The coil receives alternating-current wireless power signals from the wireless charging mat
Implementation Method 2
The rectifier circuitry converts the received signals into direct-current power
Data Source
AI summary
An electronic device (that is capable of both transmitting and receiving wireless power) may be physically and inductively coupled to a removable accessory (that only receives wireless power). The electronic device and removable accessory may optionally be placed on a power transmitting device. In response to the electronic device and removable accessory being placed on a wireless power transmitting device, the electronic device may switch from a power transmitting mode (in which the electronic device transmits wireless power to the removable accessory) to a power receiving mode (in which the electronic device receives wireless power from the wireless power transmitting device). To ensure the electronic device detects the wireless power transmitting device and switches to the power receiving mode in this scenario, the electronic device may transmit wireless power in bursts separated by sleep periods while in the power transmitting mode.