Wireless Power Transfer Burst Control for Accessory Charging
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Solution Overview
Problem
Existing wireless power transfer systems face inefficiencies during intermittent power delivery, particularly in burst mode operations, due to inefficient power management and lack of adaptive control mechanisms that account for varying power consumption and charging states of accessory devices.
Innovation Solution
A wireless power transfer system that employs pulsed or burst mode operation with variable on and off times, where the on time is terminated when the energy storage device is fully charged, and the off time is determined based on power consumption information from the accessory device, allowing for adaptive control and optimized power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If continuous wireless power transfer is used, then adequate power delivery is ensured, but energy efficiency deteriorates due to unnecessary power transmission during periods when the accessory device is fully charged
Solution Approach 1:
The system uses periodic pulsed power transfer instead of continuous transmission. The wireless power transfer circuitry operates in burst mode with defined on-times and off-times, periodically checking charging status and delivering power only when needed, thereby reducing energy waste while maintaining reliable power delivery to the accessory device
2Loss of energy
If pulsed mode with variable on time is used, then energy efficiency is improved by reducing unnecessary power delivery, but system complexity increases due to need for charging state detection and adaptive control
Solution Approach 1:
The system implements feedback mechanisms where the wireless power transfer circuitry monitors the charging state of the accessory device's energy storage component. Based on this feedback, the circuitry adaptively adjusts the on-time duration in pulsed mode, terminating power delivery when the accessory device is fully charged. This feedback-based adaptive control reduces energy losses while managing system complexity through intelligent monitoring and adjustment
3Productivity
If intermittent burst mode operation is used, then operating efficiency is enhanced, but power delivery reliability may be compromised for accessories with varying power consumption requirements
Solution Approach 1:
The system employs dynamic control of pulsed power transfer parameters. The on-time and off-time durations are adjusted based on real-time monitoring of the accessory device's power consumption characteristics and charging state. This dynamic adaptation ensures that power delivery remains reliable for accessories with varying power requirements while maintaining high operating efficiency through intermittent operation
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 enhances operating efficiency by minimizing switching losses and quiescent current losses, ensuring adequate power delivery while preventing overcharging, thus optimizing the system's efficiency and extending battery life.
Implementation Method 1
Wireless power transfer, in which power is delivered via inductive coupling between a power transmitter (PTx) and a power receiver (PRx)
Implementation Method 2
an accessory device including a second wireless power transfer coil, a rectifier coupled to the second wireless power transfer coil
Data Source
AI summary
A wireless power transfer system can include an electronic device including a first wireless power transfer coil and wireless power transfer circuitry coupled to the wireless power transfer coil. The wireless power transfer circuitry can be capable of receiving power and transmitting power wirelessly via the first wireless power transfer coil. The system can further include an accessory device including a second wireless power transfer coil, a rectifier coupled to the second wireless power transfer coil, and an energy storage device coupled to the rectifier by a regulator circuit. The wireless power transfer circuitry can operate in a pulsed or burst wireless power transfer mode to deliver power to the accessory device.