Wireless Power Transmitter Sensor Placement
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in accurately measuring the temperature of an interface surface with a temperature sensor placed within the housing, leading to potential power leakage and heat generation due to eddy currents, and interference with wireless transmission signals.
Innovation Solution
A wireless power transfer apparatus with a temperature sensor positioned to measure temperature through an opening in the housing, using a contactless infrared thermometer to avoid interference and enable accurate temperature measurement, while a power transmission control unit selectively controls coils based on temperature distribution to prevent heat generation and optimize power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a temperature sensor is disposed within the housing of the wireless power transfer apparatus, then the temperature measurement is convenient and integrated, but eddy current is generated due to the temperature sensor causing power leakage and heat generation
Solution Approach 1:
The temperature sensor is extracted from the housing interior and repositioned on the external surface of the housing. This removes the sensor from the electromagnetic field environment that causes eddy currents, eliminating the harmful effect while maintaining the integrated temperature measurement function through external sensor placement.
2Measurement precision
If the temperature sensor is disposed within the housing, then the sensor can measure temperature directly, but the sensor interferes with wireless transmission signals
Solution Approach 1:
The temperature sensor is extracted from the housing interior and positioned on the external surface, removing it from the wireless transmission signal path. This eliminates signal interference while the sensor continues to measure temperature through thermal conduction from the housing surface, maintaining measurement precision without the harmful interference effect.
3Measurement precision
If a temperature sensor is provided on the interface surface, then accurate temperature measurement is achieved, but the sensor occupies space and may interfere with power transfer
Solution Approach 1:
The temperature sensor is implemented as a thin-film or surface-mounted component on the housing exterior, utilizing the housing surface itself as the mounting substrate. This approach achieves accurate temperature measurement without occupying additional internal space or complicating the device structure, as the sensor integrates with the existing housing surface.
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 effectively measures the temperature of an interface surface without interfering with wireless transmission signals and controls power transfer to prevent heat generation, ensuring efficient and accurate wireless power transfer.
Implementation Method 1
a coil part disposed within the housing and configured to transmit a wireless power signal to a wireless power reception apparatus
Implementation Method 2
a temperature sensor disposed within the housing to overlap the opening, and configured to measure temperature of an object through the opening
Data Source
Figure 1~2B
Figure 3
Figure 4A~4B
AI summary
The present invention relates to a wireless power transfer apparatus performing communication with a wireless power reception apparatus. The wireless power transfer apparatus includes a housing having one surface with an opening, a coil part disposed within the housing and configured to transmit a wireless power signal to the wireless power reception apparatus, a temperature sensor disposed within the housing to overlap the opening, and configured to measure temperature of an object through the opening, and a power transmission control unit configured to control the coil part based on the temperature measured by the temperature sensor.