Wireless Power Mode Switching via Burst Charging Detection
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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, leading to suboptimal power transfer and potential battery drainage in accessories.
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 puck, allowing the electronic device to switch from a power transmitting mode to a power receiving mode, enabling the accessory to siphon power while ensuring the device can detect the charging puck's presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic device continuously transmits wireless power in power transmitting mode, then the removable accessory receives sufficient power, but the electronic device cannot detect the presence of the wireless power transmitting device and switch to power receiving mode
Solution Approach 1:
The electronic device transmits wireless power in periodic bursts rather than continuously, with each burst followed by a sleep period. This periodic transmission pattern allows the device to detect the presence of a wireless power transmitting device during sleep periods while still providing power to the removable accessory during transmission bursts, thereby resolving the contradiction between maintaining power transfer reliability and enabling detection capability
Solution Approach 2:
The continuous power transmission operation is segmented into discrete transmission bursts separated by sleep periods. This segmentation allows the electronic device to alternate between power transmitting mode and a detection state, enabling it to detect the charging puck's presence during sleep periods while maintaining power delivery to the accessory during bursts, thus resolving the detection conflict
2Measurement precision
If the electronic device switches to power receiving mode to detect the charging puck, then the detection accuracy improves, but the removable accessory may experience battery drainage due to lack of power transmission
Solution Approach 1:
The system uses periodic transmission bursts where the electronic device transmits power for a duration sufficient to charge the removable accessory, then enters a sleep period for detection. This timing is optimized so that each transmission burst provides adequate power to the accessory before the device needs to detect the charging puck, balancing detection accuracy requirements with accessory power needs
Solution Approach 2:
The electronic device performs power transmission to the removable accessory in advance before entering the sleep period for detection. This preliminary power delivery ensures the accessory has sufficient charge accumulated before the device switches modes, preventing battery drainage while enabling accurate detection during subsequent sleep periods
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, maintaining accessory battery charge while allowing the device to switch modes effectively, optimizing energy distribution between the device and accessory.
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.