Wireless Power Transfer Coil Turn Adjustment
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Solution Overview
Problem
The maintenance of traditional mechanical adjusting devices in wireless power transfer systems for electric vehicles is difficult, and they require additional industrial design expenses to ensure proper positional alignment for efficient charging, which is not negligible.
Innovation Solution
A controlling method and device that adjust the number of coil turns in the wireless power transfer system based on positional relationship information, using a mapping relationship to optimize the input impedance and voltage gain characteristics without mechanical alignment, allowing for efficient charging without mechanical adjusting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical adjusting device is used to align the transmitting and receiving components, then the positional relationship can be adjusted to meet charging requirements, but the device complexity increases and maintenance becomes difficult
Solution Approach 1:
The patent replaces the mechanical adjusting device with an electrical control system that adjusts the number of coil turns in the transmitting component. Instead of using mechanical mechanisms to physically reposition components, the system uses electrical control to modify the coil configuration, thereby achieving positional adaptation without mechanical complexity
Solution Approach 2:
The patent changes the electrical parameter (number of coil turns) of the transmitting component to adapt to different positional relationships. By varying the coil turns, the system adjusts its electromagnetic characteristics to maintain efficient power transfer despite positional variations, eliminating the need for mechanical adjustment
2Productivity
If a mechanical adjusting device is provided for aligning components, then charging efficiency can be maintained, but additional industrial design expenses are incurred
Solution Approach 1:
The patent eliminates the mechanical adjusting device and its associated design costs by substituting it with an electrical control system that modifies coil turns. This substitution maintains charging efficiency while reducing manufacturing complexity and design expenses
Solution Approach 2:
The system performs self-adjustment by automatically controlling the number of coil turns based on detected positional relationships. This self-service capability eliminates the need for complex mechanical adjustment mechanisms and reduces industrial design requirements
3Reliability
If the number of coil turns is adjusted to meet impedance and gain characteristics, then stable wireless charging is achieved, but the control complexity increases
Solution Approach 1:
The patent employs a feedback control mechanism where the system detects the positional relationship between transmitting and receiving components, determines the required number of coil turns to achieve target impedance and gain characteristics, and automatically adjusts the coil configuration. This closed-loop feedback ensures stable wireless charging while managing control complexity through automation
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 method enables stable and efficient wireless charging by adjusting coil turns to meet the required impedance and gain characteristics, reducing maintenance complexity and eliminating the need for mechanical alignment, thus improving system efficiency and reducing costs.
Implementation Method 1
the transmitting component consists of a magnetic core, a coil 1 and a capacitor C1 connected in series, and the receiving component consists of a magnetic core, a coil 2 and a capacitor C2 connected in parallel
Implementation Method 2
the transmitting component consists of a magnetic core, a coil 1 and a capacitor C1 connected in series
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A controlling method and device for a wireless power transfer system, wherein the wireless power transfer system includes a transmitting component and a receiving component, and further includes a contactless transformer & compensation (CT&C) circuit, and the controlling method includes: obtaining positional relationship information of the transmitting component and the receiving component; adjusting the number of coil turns of the transmitting component based on the positional relationship information, and making conditions of a CT&C voltage gain characteristic and an input impedance characteristic after a charging inverter bridge of the wireless power transfer system meet a charging condition. The abovementioned technical solution can provide a protection for a stable operation of the wireless power transfer system with a non-mechanical adjusting device, and the wireless charging can be achieved without using a mechanical adjusting device to align and range.