Non-contact Power Transmission Coil Positioning via Harmonic Resonance
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Solution Overview
Problem
Current non-contact power transmission systems face challenges in accurately positioning primary and secondary coils across different manufacturers, sizes, shapes, and designs of portable terminals, leading to inefficiencies and the need for dedicated charging instruments, which limits versatility and convenience.
Innovation Solution
A power transmission control device that includes a power-transmitting-side control circuit, a calculation circuit, and an actuator control circuit to automatically detect and align the secondary coil position using harmonic resonance, allowing the primary coil to be accurately positioned relative to the secondary coil, enabling efficient power transmission without manual adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated power transmitting instrument is provided for each secondary-side instrument, then the positioning accuracy between primary and secondary coils is improved, but the device complexity and lack of versatility worsen
Solution Approach 1:
The power transmitting instrument is designed with universal adaptability to accommodate multiple types of portable terminals (different manufacturers, sizes, shapes, and designs) through a single device. The system achieves this by implementing automatic coil positioning functionality that can detect and adjust to various secondary coil positions regardless of the terminal type, eliminating the need for dedicated charging instruments for each device model.
Solution Approach 2:
The system employs dynamic coil positioning where the primary coil position is automatically adjusted based on real-time detection of the secondary coil position. The actuator control circuit dynamically moves the primary coil to the optimal position relative to the detected secondary coil, enabling the system to adapt to different terminal configurations without requiring dedicated instruments for each type.
2Device complexity
If manual adjustment of coil position is required, then the device complexity is reduced, but the ease of operation and productivity worsen
Solution Approach 1:
The power transmitting instrument performs self-positioning of the primary coil relative to the secondary coil. The system automatically detects the secondary coil position and adjusts the primary coil position without requiring manual intervention from the user. This self-service functionality significantly improves ease of operation while maintaining reasonable device complexity through automated control circuits.
Solution Approach 2:
The system implements feedback control where the position detection circuit continuously monitors the relative position between primary and secondary coils, and the actuator control circuit adjusts the primary coil position based on this feedback information. This closed-loop control system automatically achieves optimal positioning without manual adjustment, improving user convenience while using straightforward control mechanisms.
3Measurement precision
If continuous power transmission is performed to detect misalignment, then the measurement precision of coil position is improved, but the use of energy worsens
Solution Approach 1:
The system performs power transmission and position detection in periodic cycles rather than continuously. The power-transmitting-side control circuit intermittently activates the primary coil to detect secondary coil position and then stops power transmission when positioning is complete or when no terminal is detected. This periodic operation maintains measurement precision for coil position detection while significantly reducing overall energy consumption compared to continuous operation.
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 enhances the versatility and convenience of non-contact power transmission by allowing automatic coil positioning, ensuring accurate alignment regardless of terminal design, thus improving the system's ability to charge various devices without the need for dedicated charging instruments.
Implementation Method 1
non-contact power transmission (contactless power transmission) that utilizes electromagnetic induction to enable power transmission without metal-to-metal contact
Implementation Method 2
a resonant circuit that resonates with a harmonic of a drive frequency of a primary coil is formed by the capacitor and a leakage inductance
Implementation Method 3
a power transmitting device and a power receiving device that are electromagnetically coupled
Data Source
AI summary
A power transmission control device used for a non-contact power transmission system includes a power-transmitting-side control circuit that controls power transmission to a power receiving device, a calculation circuit that calculates the position of a secondary coil by performing given calculations, and an actuator control circuit that controls the operation of an actuator, the actuator moving the position of the primary coil in an XY plane, the actuator control circuit scanning the primary coil for detecting the position of the secondary coil L2, the calculation circuit performing the given calculations based on data acquired by the scan for detecting the position of the secondary coil L2 to determine the position of the secondary coil L2, and the actuator control circuit moving the primary coil L1 so that the position of the primary coil coincides with the calculated position of the secondary coil.