Wireless Power Transmitter Coil Thermal Management via Dynamic Control
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in efficiently reducing heat generated by transmitter coils, particularly when charging large-capacity devices, which can lead to overheating and safety issues, and require costly temperature sensing mechanisms.
Innovation Solution
A wireless power transmitting device with multiple partially overlapping transmitter coils and a controller that adjusts the number of operating coils and fan operation based on response signals to manage heat and adapt communication methods according to the power requirements of the receiving device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple transmitter coils operate simultaneously to charge large-capacity devices, then power transmission capability is improved, but heat generation increases causing safety issues
Solution Approach 1:
The patent implements dynamic control of the number of operating transmitter coils based on real-time temperature monitoring. The controller adjusts coil operation dynamically - using more coils when temperature is low for high power transmission, and reducing active coils when temperature rises to prevent overheating, thus resolving the contradiction between power capability and heat generation
Solution Approach 2:
The system changes operational parameters (number of active coils, power transmission level) based on temperature conditions. By monitoring temperature and adjusting coil operation parameters accordingly, the system maintains optimal power transmission while preventing excessive heat accumulation
2Reliability
If temperature sensors are added to monitor heat, then safety is improved, but product cost increases
Solution Approach 1:
The transmitter coils themselves serve as temperature sensing elements by monitoring their own impedance changes with temperature. The controller detects temperature rise through impedance variation of the coils, eliminating the need for separate temperature sensors and reducing product cost while maintaining safety
Solution Approach 2:
The transmitter coils perform dual functions: power transmission and temperature monitoring. By utilizing the existing coil structure for both purposes through impedance detection, the system achieves temperature sensing capability without adding separate components, thus improving safety while avoiding increased cost
3Productivity
If the number of operating coils is increased, then power transmission efficiency is improved, but heat generation and cooling requirements increase
Solution Approach 1:
The system dynamically adjusts the number of operating coils based on temperature feedback. When temperature is within safe limits, more coils operate to maximize power transmission efficiency. When temperature approaches unsafe levels, the system reduces the number of active coils to decrease heat generation, thus balancing productivity and energy loss
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 solution effectively reduces heat generation and adapts communication methods to ensure efficient power transfer while avoiding overheating and product damage, without the need for costly temperature sensors.
Implementation Method 1
a transmitter coil section (180) including a plurality of partially overlapping transmitter coils (181 to 184)
Implementation Method 2
a fan (131) for cooling heat generated by the transmitter coil section (180)
Data Source
AI summary
The present invention relates to a wireless power transmitting device. The wireless power transmitting device comprises a transmitter coil section with a plurality of partially overlapping transmitter coils; a fan for cooling heat generated by the transmitter coil section; and a controller for sending out a detection signal through the transmitter coil section, calculating the number of operating coils based on the strength of a response signal to the detection signal, and controlling the fan based on the calculated number of operating coils. Accordingly, heat generated by the transmitter coils can be reduced more efficiently.