Wireless Power Reception Device Cooling Fan Harmonic Noise Suppression
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Solution Overview
Problem
High-frequency AC power transmission in wireless power transfer systems generates harmonics that can cause noise interference with auxiliary machinery and electronic devices, particularly when cooling devices are proximal to the secondary resonant coil.
Innovation Solution
The power reception device is configured such that the cooling fan and other electrical devices are electrically connected to the power line, receiving power directly from the rectified AC and operating independently of the auxiliary machinery power supply, thereby suppressing harmonic propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrical devices are connected to the auxiliary machinery power supply, then the system structure is simplified, but harmonic noise interferes with electronic devices
Solution Approach 1:
The power supply system is segmented into two independent channels: the auxiliary machinery power supply and the rectified AC power line. Electrical devices are assigned to operate from the rectified AC power line, separating them from the auxiliary machinery power supply to prevent harmonic noise propagation while maintaining structural simplicity.
Solution Approach 2:
The rectified AC power line acts as an intermediary power source for electrical devices, decoupling them from the auxiliary machinery power supply. This intermediary channel provides necessary power while blocking harmonic noise from reaching sensitive electronic devices.
2Temperature
If cooling devices are placed proximal to the secondary resonant coil, then cooling efficiency is improved, but noise interference with auxiliary machinery increases
Solution Approach 1:
The cooling device is segmented into a separate power consumption group that operates independently from the auxiliary machinery. By powering the cooling device from the rectified AC line, its location can be optimized for cooling efficiency without compromising the electromagnetic environment of the auxiliary machinery.
Solution Approach 2:
The rectified AC power line serves as an intermediary power source that enables the cooling device to operate near the secondary resonant coil without transmitting harmonic noise to the auxiliary machinery power supply, thus allowing optimal thermal management while protecting sensitive equipment.
3Ease of operation
If high-frequency AC power is transmitted wirelessly, then contactless power transfer is achieved, but harmonics are generated that interfere with auxiliary machinery
Solution Approach 1:
The harmonic-rich rectified AC power is intentionally directed to power electrical devices such as cooling fans, converting the harmful harmonic content into useful operational power. This approach eliminates the need for additional filtering components while utilizing the harmonic energy to drive devices that can tolerate or benefit from such power characteristics.
Solution Approach 2:
The harmful harmonics are extracted from the power transmission path by directing them to a separate power line (rectified AC output) that powers only specific electrical devices. This extraction removes the harmful effect from the auxiliary machinery power supply while maintaining the benefit of contactless power transfer.
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 configuration effectively reduces noise interference from the received power, ensuring that the cooling and other devices operate without influencing auxiliary machinery and electronic devices, enhancing the overall efficiency of power transfer.
Implementation Method 1
a resonance coil receives electric power without contact from a resistance coil included in an electric power feeding apparatus outside a vehicle by resonating with the resonance coil via an electromagnetic field
Implementation Method 2
An electromagnetic induction coil takes, by electromagnetic induction, the electric power received by the resonance coil
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A vehicle (200) includes a power reception unit (210), a rectifier (220), a power line (230), and a cooling fan (240). The power reception unit (210) of the vehicle (200) is configured to receive, in a contactless manner, AC power output from a power transmission unit (130) of a power transmission device (110). The rectifier (220) rectifies the electric power received by the power reception unit (210). The electric power rectified by the rectifier (220) is output through the power line (230). The cooling fan (240) cools the power reception unit (210). The cooling fan (240) is electrically connected to the power line (230), and operates with the electric power received from the power line (230).