Rectifier Arbitration for Wireless Charging Efficiency
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Solution Overview
Problem
Wireless charging systems face challenges in effectively transmitting power due to lack of flexibility, leading to inefficient power transfer between power transmitting and receiving devices.
Innovation Solution
A wireless power transmitting device with an array of coils and rectifiers, where control circuitry determines which rectifiers to enable based on alternating-current voltages and output currents, ensuring optimal power transfer by dynamically adjusting rectifier operation during power-up and power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple rectifiers are enabled in parallel to receive power from multiple receiving coils, then the power receiving capability is improved, but the system complexity and energy loss increase due to unnecessary rectifier operation
Solution Approach 1:
The system dynamically enables or disables rectifiers based on real-time operating conditions. The control circuitry monitors the state of receiving coils and selectively activates only the rectifiers needed for current power transfer, rather than keeping all rectifiers continuously active. This dynamic adaptation reduces energy loss while maintaining power receiving capability.
Solution Approach 2:
The system changes the operational parameters of rectifiers based on system state. By monitoring parameters such as coil activation status and power transfer requirements, the control circuitry adjusts which rectifiers are enabled, effectively changing the system's electrical configuration to optimize energy efficiency while maintaining adequate power reception.
2Productivity
If all rectifiers are enabled simultaneously to maximize power transfer, then the power transfer efficiency is improved, but the device complexity and control difficulty increase
Solution Approach 1:
The control circuitry automatically determines which rectifiers to enable based on the operational state of receiving coils without requiring complex external control. The system self-manages rectifier activation by monitoring coil status and autonomously making decisions about power distribution, simplifying the overall control architecture while maintaining efficient power transfer.
Solution Approach 2:
The control circuitry determines rectifier enablement based on the state of receiving coils before power transfer begins. By pre-assessing which coils are active and which rectifiers will be needed, the system prepares the appropriate rectifier configuration in advance, avoiding the need for complex real-time switching during power transfer.
3Loss of energy
If rectifiers are selectively enabled based on receiving coil state, then the energy efficiency is improved, but the control circuitry complexity increases
Solution Approach 1:
The control circuitry uses feedback from the state of receiving coils to determine rectifier enablement. By continuously monitoring which coils are active and using this information to control rectifier activation, the system achieves energy efficiency through a relatively simple feedback-based control mechanism rather than complex predictive algorithms.
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
Enhances the flexibility and efficiency of power transmission by ensuring that only the necessary rectifiers are enabled, maximizing power transfer and minimizing energy loss, thereby improving the overall performance of wireless charging systems.
Implementation Method 1
A portable device may have a receiving coil and rectifier circuitry for receiving wireless alternating-current (AC) power from a coil in the power transmitting device that is overlapped by the receiving coil
Implementation Method 2
The rectifier converts the received AC power into direct-current (DC) power
Data Source
AI summary
A wireless power transmitting device may transmit power wirelessly to a wireless power receiving device. The wireless power receiving device may be a portable electronic device with an array of wireless power receiving coils that receive wireless power from wireless power transmitting coils in the wireless power transmitting device. Each receiving coil in the array of wireless power receiving coils may be coupled to a respective rectifier. Control circuitry of the wireless power receiving device may be configured to determine which rectifiers to enable for synchronous rectification. The control circuitry may be configured to enable at least one rectifier based on the alternating-current voltages produced by each coil in the array of receiving coils. The control circuitry may also be configured to enable at least one rectifier based on the output current from each rectifier.