Noncontact Charging Device Temperature Sensor Positioning
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Solution Overview
Problem
Existing noncontact charging devices fail to promptly control abnormal temperature increases in foreign metal substances, leading to potential safety hazards, as they continue to flow charging current even after reaching a predetermined temperature, thereby increasing the time to reduce the foreign substance's temperature.
Innovation Solution
A noncontact charging device with a temperature-detecting unit that optimally positions a temperature sensor on the primary coil to detect surface temperature and terminate power transmission when a predetermined temperature is reached, adjusting for the size and location of foreign materials to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging current is lowered when temperature reaches predetermined level, then safety is improved, but charging time increases
Solution Approach 1:
The temperature sensor is positioned to detect temperature changes in advance before foreign metal substances cause abnormal heating. By detecting the temperature of the power transmission coil early, the system can take preliminary action to reduce charging current or terminate charging before the foreign metal substance reaches dangerous temperatures, thus maintaining safety while minimizing charging time loss.
2Reliability
If the temperature sensor is positioned to detect power transmission coil temperature, then abnormal temperature increase control is improved, but device complexity increases
Solution Approach 1:
The temperature sensor is positioned at a specific location on the power transmission coil where temperature changes most accurately reflect the thermal state of the coil and any foreign metal substances. By selecting the optimal sensing location, the system achieves effective temperature monitoring with minimal sensor complexity, avoiding the need for multiple sensors or complex sensor arrays.
3Productivity
If charging current continues to flow after temperature reaches predetermined level, then charging efficiency is maintained, but foreign metal substance temperature control deteriorates
Solution Approach 1:
The system continuously monitors the temperature of the power transmission coil through the positioned temperature sensor and uses this feedback to dynamically adjust the charging current. When the sensor detects that the coil temperature has reached or exceeded the predetermined level, the control circuit responds by reducing or terminating the charging current, thereby preventing abnormal temperature increases in foreign metal substances while maintaining charging efficiency under normal conditions.
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 and promptly controls abnormal temperature increases in foreign metal substances, enhancing the safety of the noncontact charging device by terminating power transmission when a dangerous temperature is detected, thereby preventing overheating.
Implementation Method 1
a temperature sensor mounted on the optimal position of the primary transmission coil 5 so as to be in contact with the primary transmission coil 5
Implementation Method 2
a primary transmission coil 5 and a secondary transmission coil 11, and terminates the charging when the temperature detected by the temperature sensor exceeds a predetermined temperature
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A noncontact charging device includes a mounting portion, a primary transmission coil (5), a temperature-detecting element (7), and a control unit (9). A device charged in a noncontact manner is mounted on the mounting portion. The primary transmission coil (5) supplies power to a secondary transmission coil (11) provided to the device by the use of electromagnetic induction. The temperature-detecting element (7) detects a temperature of a material mounted on the mounting portion. The control unit (9) is configured to supply power to the primary transmission coil (5) and terminate the power supply to the primary transmission coil (5) when a predetermined temperature is detected by the temperature-detecting element (7). The temperature-detecting element (7) is located on a side of a contact surface between the mounting portion and the primary transmission coil (5), and the center of the temperature-detecting element (7) is located within a range of the diameter of the primary transmission coil (5) from the center position of the primary transmission coil (5).