Wireless Power Transmitter Configuration Switching for Stable High Power
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Solution Overview
Problem
Current wireless power transfer systems face challenges in supporting high power levels, particularly in controlling power variations and managing transient conditions such as overvoltage or undervoltage, which can lead to suboptimal performance and potential damage to receivers.
Innovation Solution
A power transmitter with a configuration controller that switches between predefined power transfer configurations, each with different maximum power limits and voltage amplitudes, communicates these changes to the receiver to ensure seamless transitions and prevent undesirable voltage fluctuations, allowing for efficient power transfer over a wide range of power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If current limiting is used to control power variations, then power control is achieved, but transient voltage fluctuations and overvoltage/undervoltage conditions occur
Solution Approach 1:
The transmitter pre-calculates and communicates voltage amplitude information for candidate power transfer configurations to the receiver before switching occurs. This allows the receiver to prepare for the upcoming voltage change, preventing transient overvoltage or undervoltage conditions by ensuring the receiver is ready to handle the new voltage level when the switch occurs.
Solution Approach 2:
The receiver monitors the power transfer configuration and communicates its preferences back to the transmitter. The transmitter uses this feedback to select appropriate configurations and timing for switches, ensuring that power variations are controlled while maintaining voltage stability through coordinated decision-making between transmitter and receiver.
2Power
If power level is increased to support high power transfer, then power capability is improved, but transient conditions and voltage fluctuations worsen
Solution Approach 1:
Before executing a power level change, the transmitter communicates the voltage amplitude of the target configuration to the receiver in advance. This preliminary notification allows the receiver to prepare its voltage regulation circuitry, ensuring that high power transfers can occur without causing damaging transient voltage spikes or drops.
Solution Approach 2:
The system dynamically switches between multiple predefined power transfer configurations, each with different voltage amplitudes and power limits. This dynamic adaptation allows the system to optimize for high power transfer when needed while maintaining voltage stability through coordinated switching based on real-time conditions and receiver preferences.
3Adaptability or versatility
If multiple power configurations are used to support wide power range, then power flexibility is improved, but system complexity increases
Solution Approach 1:
The power transfer capability is divided into multiple discrete, predefined configurations, each with specific voltage amplitudes and power limits. This segmentation allows the system to support a wide power range through a manageable set of standardized options rather than requiring continuous adjustment capabilities, simplifying the control logic while maintaining flexibility.
Solution Approach 2:
The multiple power transfer configurations are designed to be universally applicable across different receiver devices and use cases. Each configuration represents a standardized operating mode that can serve various power requirements, allowing a single transmitter to handle diverse power demands without requiring device-specific customization, thus managing complexity while maintaining versatility.
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 enables flexible and efficient high-power wireless power transfer while minimizing the risk of transient voltage issues, ensuring reliable operation across various power levels and maintaining compatibility with diverse receiver devices.
Implementation Method 1
power is inductively transferred from a transmitter coil in a power transmitter device to a receiver coil in the individual devices
Implementation Method 2
a receiver coil arranged to extract power from the power transfer signal
Data Source
AI summary
A power transmitter (101) provides power to a power receiver (105) via an electromagnetic power transfer signal. The power transmitter (101) comprises an output circuit (302, 103) with a transmitter coil (103) generating the power transfer signal in response to a drive signal generated by a driver (301). A configuration controller (303) switches between power transfer configurations having different maximum power limits and voltage amplitudes for the drive signal. A transmitter (307) transmits a power configuration message to the power receiver (105) comprising data indicative of a voltage amplitude for a first power transfer configuration a receiver (305) receives a power transfer configuration change request message from the power receiver (105). The configuration controller (303) switches the power transmitter (101) to the first power transfer configuration in response to the power transfer configuration change request message. The approach allows a power transmitter and receiver to collaborate to change power transfer configurations providing different maximum power limits.