Wireless Power Transmitter Mode Control for Transient Response
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in achieving optimal power control loop performance, including suboptimal flexibility, cost, complexity, power range support, transient power performance, adaptability, and backwards compatibility, particularly in systems like Qi Specifications.
Innovation Solution
A power transmitter system that includes a mode store to store power level modes with reference power levels, a mode circuit to adapt the drive signal based on mode request messages, and a power loop controller to adjust power levels, allowing for faster and more stable power transfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power control loop is implemented to control and adapt power transfer, then power level adjustment is improved, but the system complexity and design difficulty increase
Solution Approach 1:
The patent changes the control parameter from continuous power adjustment to discrete power level modes. The mode circuit responds to mode request messages by switching between predefined power levels stored in the mode store, rather than implementing continuous control loop adjustments. This reduces system complexity while maintaining adaptability to different power requirements.
Solution Approach 2:
The patent segments the power control function into discrete power level modes. Instead of a continuous control loop, the system divides power adjustment into separate, manageable modes that can be switched between based on receiver needs. This segmentation simplifies the control mechanism while preserving adaptability.
2Loss of energy
If a power control loop is used to efficiently control power transfer, then power transfer efficiency is improved, but transient power performance deteriorates due to loop response time
Solution Approach 1:
The patent performs preliminary action by pre-defining and storing multiple power level modes in the mode store before power transfer begins. When a mode request message is received, the mode circuit can immediately switch to the corresponding predefined power level without waiting for the control loop to calculate and adjust. This eliminates transient response delays while maintaining efficient power transfer.
Solution Approach 2:
The patent introduces dynamic switching between predefined power levels through the mode circuit. Instead of relying on the gradual adjustment of a control loop, the system dynamically transitions between discrete power modes based on receiver requests, achieving both efficiency and fast transient response.
3Adaptability or versatility
If wireless power transfer supports varying power levels, then adaptability to different devices is improved, but system complexity increases
Solution Approach 1:
The patent implements universality by creating a mode-based power control system that can serve multiple different power receivers with varying power requirements. The mode store contains predefined power levels that can accommodate different device types, making the transmitter universally compatible without requiring complex device-specific control logic for each receiver.
Solution Approach 2:
The patent uses parameter changes by storing different power level configurations in the mode store and switching between them based on receiver needs. This allows the system to adapt to different devices by changing power parameters through simple mode switching rather than implementing complex adaptive control for each device type.
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
The system enables improved power transfer efficiency, flexibility, and transient performance by overriding power control loop constraints, supporting a wide range of power levels and adapting to different receivers without pre-stored information.
Implementation Method 1
power is inductively transferred from a transmitter coil in a power transmitter device to a receiver coil in the individual devices
Data Source
AI summary
A wireless power transmitter (101) an output circuit (203, 103) comprises a transmitter coil (103) for which generates the power transfer signal a drive signal generated by a driver circuit (201) is applied. A power loop controller (209) implements a power control loop for controlling the drive signal to adjust a power level of the power transfer signal in response to power control error messages received from the power receiver (105). A mode store (213) stores a plurality of power level modes for the power receiver where each power level mode is associated with a reference power level for the power transfer signal. A mode circuit (211) adapts the drive signal to set the power level of the power transfer signal to a first reference value in response to receiving a mode request message where the first reference value corresponds to a reference power level for a first power level mode indicated in the mode request message.